And it has to be on a 92... These damned ECMs are like gold... absolute unobtainium.

Time to research... this may be the time to update to a 94 PCM setup... if it will adapt to my car painlessly.

At least I get programming and SFI out of the deal.

Background:

This morning, I had to go to the Apple store to deal with my iPhone (got a new one under warrantee).

Well... the bonger to remind me that my parking lights were on doesn't work, so I occasionally forget to turn off the lights. And when I got back, the battery was DOA. I am sorry, but a strong battery should last more than 45 minutes with just the parking lights on. Problem 1.

As I left this morning, I had an ASR warning on. Code H64 and H72... I have since learned that H64 means loss of TPS signal... and H72, loss of serial data... which goes nicely with the C41 and H41 that is coming off the CCM... oh, that means loss of serial data line.

Guess what! That means my ECM is boned!

Keep us posted.

i have a spare f body 94 pcm

I'm sure there is a reason why it won't work, but could you go back to the 7727 from a 91?

I work for an auto parts store, if you want I can tap some of my contacts and try to find you an ECM.

Or, there is a guy that runs a business rebuiliding ECM's in Illinois. He offers a 1 year warranty on the units he does. Might be worth looking into.

thanks, prozac... nice thought... I donno if it will work with the ybodies, tho...

I have found a used one for $472.00!!! A reman for $900.00!!!

I just found a cardone for $330.00 at O'Reilly... calling... They have to call Cardone directly.

I will call vette2vette tomorrow...

I am also checking the engine harness for damage... never know, it does have 175k miles on it.

i know that for my obd2 pcm in my vette i have a roadmaster pcm in my car and all is well.

yea, but I will need to change harnesses.

My bigger question will be if the update will be happy with my chassis and controller.

Still researching, but it looks like the same CCM for all years.

who has a 1994 Helm and can show me the firewall harness connector? I can then compare that to the 1992.

These guys show a 93 & a 94 @ $145

http://siaelec.com/index.asp?PageActi ... WCATS&Category=365&Page=7

I may go that route... the first prices were crack smoke'n...

But the thought of a painless update to SFI and programability is tasty...

The harness looks good where it goes into the dash at the firewall.

I was half expecting to see torn split loom and frayed wires. Nope...looks great.

Are all ECM's hard to get? Say my 90's craps out, can I go to NAPA and order one? I guess not by what you are saying. How about the tune do they come with a stock tune? I don't know nothin!

Quote:

No, just 92's, they're a bitch.

Same with 93... it's the same part number.

Serious... they would be cheaper if they were made of gold and powered by dylithium crystals.

Bill - Thanks for that research. I will follow up on it after I discard or accept the later LT1 conversion.

My discussion with Jason @ Vette2Vette told me that I wasn't entirely nuts. Then again, Dino @ Corvette Salvage thought it was too big a change...

I'll be interested to see where you end up.

http://www.autopart.com/ecc/ECC1992CHEVROLETCORVETTE.htm

If mine goes, I'm going to send it to SAI Electronics.

Ok... I have determined that it might be feasible, but it would require a custom harness to make happen. 1994 is the first year of the underhood fuse panel. I am not in the mood to deal with that mod right now.

I am sure with time and solder and connectors and stuff, it could be done... but I don't have that time.

Good luck.

Mid America rebuilds them

http://www.mamotorworks.com/corvette- ... 1980+1993-1-139-7897.html

Quote:

MA just sends the out to a rebuilder so, you get to pay the rebuilder's profit and MA's markup.

oooh... like I can wait 3-4 weeks... that's crap.

Thanks for the find, tho... it's another option.

I am going outside to do more testing... and get the battery checked once and for all, too.

Quote:

You may want to call the guys,Andy.

Note the 24 hour turn around.
http://www.siaelec.com/index.asp?PageAction=Custom&ID=1

I will... This is the thing, I am 99.9% sure the ECM is dead... the SES should come on during the key on pre-start test (POST - Power On Self Test). Well... no SES...

That fits with everything else I am getting. When I turn on the key, SYS is flashing...

Ion Soltan offers 92-93 ECM repair.

But... you gotta test it by swapping it into a known-good car first. It's almost never the ECM...

I am betting it is...

I agree, 90% of the time, it isn't... but this time???

Since I don't get an SES on startup...

but then again, the battery is still sketch. I took it to the local O'Reilly and they put it on their load charger... it was charging at 12+ amps and still needed an hour! I had it on my 10 amp charger for 5+ hours Thursday night and it still needed this punch.

I have bought a new Optima red top. I will test tomorrow.

If this was a parked car, I would agree with a possible wiring issue, but with all the evidence I am getting, it has to be a dead UART or 2...

What guy in IL rebuilds ECMs? Also the 7727 will not work.. too much changed from 91 to 92

the 92-93 ECMs are like the 90-95 LT5 ECMs..

I have a spare LT5 I need to get rebuilt too..

Good Luck on finding an ECM .. did you check with Rock Auto they have a Return and rebuild service..

waiting 3-4 weeks is out of the question.

I am going to contact the place that Bill has told me about. They are showing them in stock, and will try to order from them, but not until I test with the new battery.

I'm heading down to LA on Friday morning 10/1/10 in my 93 to pick up a taiga top i have an extra ECM its the oem one from my car i can let you borrow it Intel you get yours fixed or find another or mine dies ha ha you will need to use your prom the prom in mine i think is for a camaro Craig

I thought my ECM was going out i found one on eBay for 150.00 changed the proms put it in and the problem was still there its the ECM I'm using now.

COOL! Thanks! I might take you up on that.

I have to put a new battery into the car first... voltage is an issue with these things and if the battery isn't strong, it may be causing this problem.

If that isn't the case, I am calling the place Bill suggested. See how fast they can turn around.

Thanks again!!!!

Quote:

What voltage were you seeing when you turned the key to On?
just curious.

Mine been reading 11.5 for 4 years. It's been as low as 10.7 and still started the car.
Running 14.5 to 14.7.

I've been thinking about getting a new battery for the last 6 months.

Mine was showing 12.4 or so, but voltage does not automatically = amps. Learned that one racing RC cars... all the voltage in the world isn't worth shit unless the battery can hold it for more than 3 minutes... running outta juice with 45 seconds to go is really heartbreaking.

I just installed the new battery... same thing.

1. SYS on speedo
2. No SES light on DIC
3. Crank, but no start

This is what I think happened:

Something in the ECM failed Thursday morning as I started the car. The ASR light was on indicating a problem there. I ignored it because from time to time it will get a false error that goes away on the next startup.

Remember: The CCM has to be able to handshake to the ECM for VATS to allow the car to start. Once running, it's fine... shut it off... I was boned.

The dead battery had nothing to do with this.

I am sending the ECM to SAI Electronics in Il.

They are charging a flat $175.00 for repairs. If nothing is wrong(!), it will be a $90.00 test fee.

They have a normal 3-5 day turn around.

I will keep everyone posted. It goes flat rate box today!

I shipped it...with $1000.00 insurance!!! If that SOB gets lost, I will have the $$ to fix it right!!!

If nothing is wrong with it then what would you look for?

It would have to be a seriously screwed up harness.

I am thinking life is better... I just checked our online acct and it shows my ECM has been billed. That means it should have shipped out today! I should have it Monday!!!

Quote:

The bane of my existence, with my early C4 - shouldn't it be better for you?

The harness in the 92 is MUCH better than your 85. However, there is always a chance that something got chaffed or cut in some way. Remember, I do have about 2x the miles you do - 175k.

However, judging from the amt they debited to my card, they had to fix SOMETHING. I just can't wait to find out.

My guess? Dead UARTs, both of them.

UART = Universal Async Reciever/Transmitter. They are used in modems and other serial communications devices.

In the ECM, there are 2, one is a redundant backup, they both send the same info, on the same wire, to the CCM. There is a very real chance that one failed a long time ago and the other just died.

I am guessing both were DOA.

Found why the battery wasn't getting properly charged... the lead from the alternator was junk.

The crimp was so-so, but the solder I used to fill in just went to crap... Seriouly cold joint; either that or the connector got hot enough to melt, but that would be shocking.

Tomorrow, I will get a new connector and recrimp.

ARGH!!!!!

Goddamned morons can't read... in my letter to SIA, I made it perfectly clear to ship it back USPS Flat Rate Box.

I also made this verbally to the CR lady, at least 5 times... USPS FLAT RATE BOX! "yes, I made a note of it!"

That gets it to me within 2-3 days.

I called them to ask where it was, and the #$@$%@#$ morons decided to ship it UPS ground, so the damned ECM won't be back until Thursday, and I must get smogged on Friday.

The last message from them claims ignorance. I am not done claiming their stupidity. At least they put the insurance on it.

I am not done reaming them yet. But they are now closed... and I am dead in the $#@%$@^%#$ water until Thursday night. If they had shipped it Friday, USPS Flat Rate Box, for $4.00 more, it would have been here today. As it is, thanks to my smog test, if it doesn't work, I am so screwed... fines and crap kick in...

ARGH!!!!!

That really sucks..... sorry man.

I had to cancel my trip to Hunting Beach today, was looking forward to some SoCal sun.

Quote:

Unreal.

Can you go to the DVM and get an extension, you can do that here. Yea, I know, more of your time wasted.

I can get an extension, it just cost money and raises attention at the other end! And I don't want to raise attention with CARB!

Tell them that they need to ship you one that they have there next day air so that you can get smogged then once you get yours back you will send theirs back to them.

That sucks Andy. Hopefully you get everything worked out.

Dealing with mindless vendors and the govt., a double whammy.
I hope the repair is good.

How often do you have to have your car smogged? Every year? We don't know about that stuff out here. Sounds like they can be nasty.

CARB is a government agency with righteousness on their side.

Sure, I agree with the need for them. LA is an absolute perfect storm for pollution. We have the Pacific on the West, which has a nice fixed boundary layer which traps the air; various mountain ranges around the basin to the North and East... the South is openish, but the prevailing trades blow from the South.

This creates a box that traps the air.

And that means it traps the smog. About 50 years ago, the state put the first smog test devices on the tops of the tall buildings. These devices were much like weather stations (white boxes with louvered sides) with a thick white filter paper in them. After 24 hours, the filter paper was black as tar.

Now.... fast forward to 1980... those same white filter sheets now take 3 months to turn light gray. It's amazing the improvement.

In the mid- to late-60s, my Mother-In-Law remembers walking to the bus, and her lungs would literally hurt from the crap in the air.

There is still a light haze, sure, but that will never go away as long as man lives here.

The thing is, CARB seems to believe they can beat smog to zero, and they can't... I don't want to piss them off if I can avoid it. They are running these road side smog testers. I haven't seen them yet, but cuisinartvette has, up in the San Fernando Valley area. They use photo radar and infrared sensors to pick a group of cars out so as to figure out which was the gross polluter.

Yea... they are getting picky...

Oh, ask PeteK about pollution... Or go to Mexico City...

In many respects, CARB is a mere annoyance...

I remember goin to Disneyland in the early 60's and my folks commenting on the smog then. When I go out there now to see my daughter I am amazed at how you can see the mountains to the east clearly. I am sure they are a bunch of zealots.