All Posts (vetteoz)
Re: DTC question |
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Quote:
Mod 1 (CCM ) DTC 74 :LED display dimming output circuit open or shorted to ground http://www.corvetteforum.net/c4/dave8476/index4.shtml
Posted on: 2014/4/25 2:54
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Re: Fron spring question |
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Quote:
For future reference http://webpages.charter.net/khasting/ ... ng/techinfo/lowering.html
Posted on: 2014/3/17 21:53
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Re: No Start |
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If VATS is programmed out in the tune on a SD car, the ECM will not look for the required fuel enable signal from the CCM ; exactly the same as happens with the VATS delete on earlier MAF cars with the standalone VATS module In any case ,you have to manually bypass the VATS operated starter enable relay to fully remove VATS from the car Resistors only work to "fool" VATS into thinking the correct key is being used.If there is a fault with the VATS system itself , the resistors will do zilch
Posted on: 2013/12/30 0:27
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Re: C4 Half Shafts - Questions |
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I agree. My lowly 12 sec auto on DR's took out the needles but some had had HS failures 
Posted on: 2013/12/16 10:53
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Re: unknown wire - C4 '91 RH |
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The heat proof shield it is run in, is not stock anyway what is the color of the other wire out of the harness that runs with it ?
Posted on: 2013/12/7 23:43
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Re: Backfire from throttle body... |
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Posted on: 2013/11/5 6:38
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Re: Bob's Tuned Port Single Plane Intake/// is this worth doing |
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Quote:
http://www.thirdgen.org/techboard/tpi ... bbk-tpi-intake-setup.html Has had a long gestation period. Raised a lot of hopes when it was 1st announced. Note the date of the original posting!
Posted on: 2013/10/22 11:57
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Re: Bob's Tuned Port Single Plane Intake/// is this worth doing |
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Quote:
Would require the same EGR solution as above You only buy the HSR intake and fuel rails , reusing all your TPI stuff http://www.summitracing.com/int/parts/wnd-7540/overview/ http://www.summitracing.com/parts/HLY-534-186/ Quote:
Excuse for that hood scoop you always wanted
Posted on: 2013/10/22 4:52
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Re: Bob's Tuned Port Single Plane Intake/// is this worth doing |
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Quote:
Not sure of it's resistance to EGR gas temps ?
Posted on: 2013/10/22 1:54
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Re: Bob's Tuned Port Single Plane Intake/// is this worth doing |
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Quote:
Granted but plenty have used it for a retrofit on other than a MR. All you need is a flat surface on the plenum somewhere large enough to mount the base There are plenty of compact OEM valves that could be remote mounted so only a line to a port threaded into the plenum would be required. The options are limitless
Posted on: 2013/10/21 12:21
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Re: Bob's Tuned Port Single Plane Intake/// is this worth doing |
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Quote:
Matatk wrote: Only way would be to add the EGR valve http://www.tpis.com/pages/10_12_08
Posted on: 2013/10/20 11:57
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Re: Change 86-88 ecm to 89 |
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All I did was just install the '89 tune into my '87 '165 ECM and it functioned /datalogged fine
Posted on: 2013/10/19 7:56
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Re: Two Newbie Questions About Coolant |
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And if you never want to have to drain the block again when working on the TB ,you remove and join the the 2 heater hoses going the TB together ; the "TB" bypass You can even tidy up the IAC housing they went to 
Posted on: 2013/9/27 1:03
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Re: HSR fuel rail limit |
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Alternative is to do like the big Hp EFI guys do and loose the crossover. Supply line split to each rail then T'ed back into the reg
Posted on: 2013/8/2 1:04
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Re: How do they do it? |
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Quote:
http://www.corvette-guru.com/modules/ ... hp?topic_id=18971&forum=1 Dash works independent of the ECM ( except for speedo '90 + ) Is usual to install a new aftermarket system as standalone engine management and retain whatever stock wiring required for chassis / dash functions
Posted on: 2013/7/17 0:45
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Re: Correct rpm's |
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Quote:
You are also dealing with the common complaint of the convertor locking up at part throttle, lower road speeds pulling the revs down by 2-300 rpm.
Posted on: 2013/7/6 23:50
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Re: Alternator question |
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A breaker bar to take the tension off the serp belt and 2 bolts to undo, one of the easiest jobs on a C4
Posted on: 2013/7/1 9:26
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Re: 1984 Serpentine Belt Reroute Questions |
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Quote:
That is for a L98 but my preferred method as it does away with the idler completely This one is for a CFI retaining the idler as the OP suggests http://forums.corvetteforum.com/c4-ge ... lete-ford-tempo-belt.html FWIW the idler pulley doesn't need to be grooved as it is only tensioning the belt ; not driving anything with a load on it.
Posted on: 2013/6/18 1:18
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Re: A picture is worth 1000 words A.K.A. Vacuum problems |
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Quote:
If the CFI is setup the same as the later cars then a T at the CC should go to a one way valve then to intake vac source That same valve serves to split the vac to the HVAC inside and the CC / vac ball in the engine bay Unfortunately that system is not shown in this CFI vac diagram 
Posted on: 2013/5/24 6:41
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Re: will the digital dash cluster work with out the computer |
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Quote:
Still ends up in the same place though 
Posted on: 2013/5/24 4:46
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Re: will the digital dash cluster work with out the computer |
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Only thing on the dash in your car related to the ECM is the fuel mileage and range readout.
Everything else comes from independent sources ,tacho from the coil, gauges from their sender units , speedo from the VSS in the trans ,etc
Posted on: 2013/5/23 2:44
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Re: Throttle Body Connections |
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Quote:
http://www.aldlcable.com/ and use some free software on your laptop or netbook. Quote:
By running the datalogging program you can observe and adjust the TPS volts or RPM in real time ( no DVM or adapter for the TPS connection needed )
Posted on: 2013/5/12 8:20
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Re: Throttle Body Connections |
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Quote:
How so? As you correctly explained above , the valve has restricted flow at high vac (idle ) "The valve is simple, but actually performs a complicated control function. With the engine running, the tapered end of the internal restrictor is drawn towards the opening in the PCV valve by manifold vacuum, restricting the opening proportionate to the level of engine vacuum vs. spring tension. At idle, the intake manifold vacuum is near maximum. It is at this time the least amount of blow by is actually occurring, so the PCV valve provides the largest amount of (but not complete) restriction. As engine load increases, vacuum on the valve decreases proportionally and blow by increases proportionally. With a lower level of vacuum, the spring returns the cone to the "open" position to allow more air flow. At full throttle, vacuum is much reduced, down to between 1.5 and 3" Hg. At this point the PCV valve is nearly useless, and most combustion gases escape via the "breather tube" where they are then drawn in to the engine's intake manifold anyway" Does the PCV valve operate if you put your finger over it's open end when it is removed from the rocker cover?
Posted on: 2013/5/10 5:02
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Re: Throttle Body Connections |
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Quote:
You are correct, Quote:
There is no vac on the line to the pass side rocker cover, it is supply air at atmosphere pressure only. At best you may get some passing suction when the engine is at WOT When you go WOT and there is little vac to pull the fumes through the PCV valve, the fumes go back UP the supply line to the TB ; hence the complaints about oil contamination in the TB / plenum ; ie where does the oil come from? If as you surmise you were to have vac on both rocker covers there would be no flow for the fumes to be sucked out of the engine as both vac source would be at the same potential
Posted on: 2013/5/9 7:58
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Re: I can't be the only one |
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Quote:
TunerPro RT is the program of choice for tuning ( and datalogging ) 85 - 91 L98 cars but as mentioned by aboatguy ,Datamaster is popular for data logging as it has a much better GUI for play back of recorded logs as opposed to looking at a spreadsheet full of numbers See http://powertuneplus.com/syclone/tunersguide_dm.shtm This is prob cheapest ALDL cable http://www.aldlcable.com/
Posted on: 2013/4/9 3:14
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Re: Small cap distributor |
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Quote:
Commonly used on TBI trucks 87 -95 
Posted on: 2013/4/9 0:50
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Re: Head numbers? |
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Quote:
. it might be there, or on a pad near the oil filter... Only ever seen the rear location used on late LT1 blocks 
Posted on: 2013/3/21 13:14
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Re: Head numbers? |
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Not sure about any " stamped" numbers on the heads but the block pad above the water pump usually has a partial VIN stamped which identifies the original vehicle the engine was fitted to
Posted on: 2013/3/18 22:20
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Re: Transmission temperature gauge sensor mounting location |
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Quote:
I have mine at the rear of the pan for that reason I know the cooler is working because when the trans cooler fan kicks in I can see the temp drop almost straight away
Posted on: 2013/2/22 12:24
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Re: 1985 vette--Wanting to turn it into a 383stroker |
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Quote:
The reason for the popularity of a 383 is that IF you have to do FULL rebuild on a 350 you are only looking at the extra cost of the stroker crank (offset by what it will cost to clean the used 350 crank up )
Posted on: 2013/2/12 11:33
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Re: Interior light delay timer |
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Quote:
taped to the harness behind the DIC  For location reference 
Posted on: 2013/2/11 11:24
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Re: Interior light delay timer |
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Quote:
http://willcoxcorvette.com/product_in ... th=1940&products_id=26953 or a unit to bypass the timer http://willcoxcorvette.com/product_in ... th=1940&products_id=26954 or you can save $$$ and do the backyard fix "If the Courtesy Lamp Delay timer is bad, you can buy a replacement or bypass it. To bypass it at the Courtesy Lamp Delay timer connector, you cut the white wire at Pin A and cut the two white wires at Pin D. Solder the three white wires together. This will cause the courtesy lights to come on when the doors are opened and go out when the doors are closed. There will be no delay time out for the courtesy lights."
Posted on: 2013/2/11 11:21
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Re: 1992 headlight motor rebuild & gear replacement. |
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Posted on: 2013/2/10 4:25
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Re: B & M ratchet shifter 86 auto |
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Easy enough to check , just jumper the terminals in the plug and see whch wires makes the starter and backup lights work
generally on the shifter switch Dk blue / Lt green; backup lights Purple /Yellow; starter (thicker wires ) Org and corresponding black wire you have no switch for (are computer inputs for P/N indication) Just cut the plug off and install spade terminals to connect to the two micro switches
Posted on: 2013/2/8 7:46
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Re: TELL ME, OH WISE ONES--- |
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Quote:
You can see how soft your suspension is here. http://www.vettenet.org/susp_chart.html Can retro fit any heavier springs and sway bars from '88+
Posted on: 2013/1/28 3:58
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Re: Newbie Questions.. |
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Found it
WHF ; '94 Impala .275Hp .Auto .Ca emissions Your engine doesn't have cast iron heads does it?
Posted on: 2013/1/19 4:38
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Re: Newbie Questions.. |
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Quote:
I have worked on three (92/94/96 ) original Vette LT1 engines. They have all had the traditional 3 digit SBC engine suffix stamped on the front block pad. All Vette LT1's had a code beginning with Z ;for '94 ZWA; LT1 w/auto ZWB: LT1 w/ man so I suspect with WHF your Vette is not a virgin V0924 is the production plant / date code Quote:
This Caprice iron head LT1 doesn't appear to have the partial Vin stamped so maybe GM stopped doing that when they started stamping the rear of the block as shown above ? 
Posted on: 2013/1/19 4:31
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Re: Half Shaft U-Joint |
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Quote:
I have run the Brute Force uni's without problems when I couldn't get Spicers
Posted on: 2013/1/15 22:52
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Re: Half Shaft U-Joint |
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Should be able to pick them up for same or cheaper ( and save on shipping costs ) at your local truck or driveshaft shop.
1350 series is common driveshaft uni on most pickups Spicer # 5-1350X or if old stock superseded part # 5-799X
Posted on: 2013/1/14 12:53
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Re: Troubleshooting... it won't start!!! |
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Quote:
My memory tells me that can be installed out of phase, right? Maybe http://forums.corvetteforum.com/1576193433-post9.html http://forums.corvetteforum.com/1576193490-post10.html No start diagnostics http://www.mainstreamtopics.com/forum ... -lt1-no-start-diagnostic/
Posted on: 2013/1/8 11:44
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Re: engine id number |
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Quote:
If the engine is the original one , it will have a number stamped on the pad that matches the last digits of the car VIN There will also be a 3 letter engine ID code starting with Z if it is a C4 engine of any year (if someone swapped in a engine from another year instead of just the heads as suggested ) 
Posted on: 2012/11/16 12:05
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Re: Must you pull the engine on a C4 to do a cam change? |
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Quote:
What year is your engine? If it is a late (>'87+ ? ) 1 pce RMS engine using the 1 piece rubber pan gasket it is almost impossible to screw up the pan to timing cover seal Have R/R the pan with the engine in the car several times ; all you have to do is rotate the crank so the throws on the crank are moved to clear the pan as it comes back over the X member But as the others state I would pull the engine out to do a cam swap
Posted on: 2012/11/8 11:46
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Re: ebay red cap dist under $70 |
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Quote:
If you have injection you are out of luck EFI HEI dist is completely computer controlled ; not just non vac advance
Posted on: 2012/10/20 22:49
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Re: 700R4 trans slipping...ideas? |
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Mine did similar when I blew the sprag out of the convertor
Posted on: 2012/10/17 5:03
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Re: Analog water temp gage- 1992 |
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Quote:
As noted digital gauge is fed from the ECM which gets it's temp indication from the coolant temp sensor on water pump Quote: donhall wrote: I'm familiar with the sensor you mention... between 6 & 8 cyl., but can't confirm what sensor it is. sender for the analog gauge
Posted on: 2012/10/7 10:39
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Re: Changing my rear |
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That unit is for a cable speedo You need one of these in 40-45 tooth , 2000 (85-89) pulse variant 
Posted on: 2012/10/5 0:11
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Re: Changing my rear |
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Quote:
edelfyette wrote: You need to change both the drive and driven speedo gears Remove your 17/35 tooth (2.59 ) combo and replace with 15/42 (3.45 ) Also need a VSS to suit 40-45 tooth driven gears; your current VSS suits 35 - 39 tooth gears
Posted on: 2012/10/3 0:35
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Re: 87 Brakes |
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Plunger in differential switch has a groove visible by looking in the switch hole that needs to be in the center Recall I unscrewed the switch to see which way the plunger was offset to ( front or rear system? ) Then I opened a bleeder on other side and pushed the pedal ( same as bleeding ) so as to move the plunger back to the central (off ) position
Posted on: 2012/9/3 0:09
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Re: 87 Brakes |
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The switch on the M/c needs resetting to the central position Quote:
12V JC halogen bulbs work great. http://www.ebay.com/itm/10-Pcs-Haloge ... Bulbs&hash=item4ab9ee2b4b Just need to adjust the pin spacing slightly to fit in the 3rd light sockets
Posted on: 2012/9/1 13:30
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Re: Delayed starting |
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Sure can . http://www.thirdgen.org/vats_passkey_system If the resistor pellet on the key is not read correctly because it or the the contacts in Ign switch that read it are dirty or worn ;the VATS system shuts the starter ( and injectors ) down for 4 minutes Got a spare key to try?
Posted on: 2012/9/1 5:54
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