demco307 wrote:
Just cranked new engine today for a little bit, need some info. Upon cranking for first time engine wont Idle, I assume that Maybe Valves need adjusting, I tried to preset them without shooting oil everywhere. Question #1 could valves be too tight? also I decided to start removing alternator and other stuff to get ready to adjust valves when I noticed That the flaps in the tpis throttle body looked to be closed. could this be a good reason for not wanting to idle? should flaps in TB be open a little or does it get air from IAC? Havent ran it but about couple minuts or so total. any suggestions would be greatly appreaciated. THANKS Darren

demco307 wrote:
By what ive stated do yall thinks its my valves like I do. THANKS

Matatk wrote:
I prefer a simpler method to adjust the valves, which I used on my motor. You need to find TDC of cylinder 1 and then only turn the motor one more time for 360* to get the other valves. I think it is easier.

1) Find TDC of cylinder #1.
2) Make sure the exhaust rocker for the #1 cylinder is just
starting to open.
3) Adjust intake rockers on #1, #2, #5, #7.
4) Adjust exhaust rockers on #1, #3, #4, #8.
5) Rotate engine 360*.
6) Adjust intake rockers on #3, #4, #6, #8.
7) Adjust exhaust rockers on #2, #5, #6, #7.

To find zero lash, you should be twisting the pushrod with your finger and thumb until you feel a slight drag. Then tighten the rocker nut 1/2-1 turn past that. Some say for modified motors with less clearance, use 1/2 turn, for stock motors use 1 turn. I used 3/4.

Good luck,

Matthew

Calm wrote:
What can I say?
We in Western Canada like to spill oil.

Where do you think the Alberta Tar Sands came from?

demco307 wrote:
Reset valves,engin wants to idle. have to open throttle blades a little an hold to idle.cranks better,revs up good.Havent set yet but my brother said he set the gaps but I just checked them an their on about .039 to ..040, I think the correct gap is around .050. havent reset yet but could this be the problem? also had running earlier and disconnected the iac connector and didnt have to hold flaps open as much to idle.I think the valves are correct now. one more thing to add,does the new tpis throttle screw need to be adjusted? does the iac valve need to be adjusted for the TB. THANKS

demco307 wrote:
Reset valves,engin wants to idle. have to open throttle blades a little an hold to idle..........does the new tpis throttle screw need to be adjusted? THANKS

demco307 wrote:
also had running earlier and disconnected the iac connector and didnt have to hold flaps open as much to idle.I think the valves are correct now. one more thing to add,does the new tpis throttle screw need to be adjusted? does the iac valve need to be adjusted for the TB. THANKS

BillH wrote:

[Idle has nothing to do with the screw on the throttle body for the butterflys. Idle is controled buy the ECM looking at the IAC pintal position, throttle position, PVC flow and vacuum flow thru the IAC bypass.

BillH wrote:
Quote:

demco307 wrote:
also had running earlier and disconnected the iac connector and didnt have to hold flaps open as much to idle.I think the valves are correct now. one more thing to add,does the new tpis throttle screw need to be adjusted? does the iac valve need to be adjusted for the TB. THANKS

Since you disconnected the IAC when the engine was running, it needs to be reset.

If you had the IAC out, did you move the pintal at all?
It should measure 28mm from the point of the pintal to the mounting surface. Just a check but it's not good to move the pintal.

To reset:
Depress the accelrator pedal slightly.
Start the engine, release the pedal and run the engine 5 seconds.
Turn the iginition off for 10 seconds.
Restart and check idle.

I'm a tad confused on the tpis throttle screw, are you refering to the stop screw on the throttle body? If so, it was set at the factory ans shouldn't be touched.

If the throttle position sensor (TPS) is new, there's a way to calibrate it but this requires a Tech 1 tool and it's mostly for the ASR/ABS to learn the new TPS voltages. It may not affect the idle thing.

The other possibilities are a vacuum problem at the IAC or clogged IAC ports in the throttle body.

Idle has nothing to do with the screw on the throttle body for the butterflys. Idle is controled buy the ECM looking at the IAC pintal position, throttle position, PVC flow and vacuum flow thru the IAC bypass.

The timing adjustment on the MSD shouldn't be played with, I'm not even sure why MSD put it there since timing is controled at all times by the ECM.

dan0617 wrote:
Quote:

BillH wrote:

[Idle has nothing to do with the screw on the throttle body for the butterflys. Idle is controled buy the ECM looking at the IAC pintal position, throttle position, PVC flow and vacuum flow thru the IAC bypass.

If the car is mostly stock this is correct, but I have found, especially with larger than stock camshafts, you might need to adjust the throttle blade screw to get the IAC to be mostly closed to get it to idle correctly. Every setup is different so you may or may not need to do this.

When you said new tpis throttle screw, I assumed that you have a new throttle body from tpis and assumed that it would not be preset for your combo.