Hi guys, just having real issues trying to figure this out.

I am driving 1991 z28 conv. 5.0 tpi automatic, everything stock platform.

It's having a hard timing starting, but it will start once I feather the throttle. If it warms up it will stay on but other wise die and continuously have hard to start issues. The car runs fine otherwise.

I check fuel pressure , I am getting spark, checked ohms on injectors and voltage to injectors, cleaned throttle body, base timing is 6 deg btdc.
I replaced distributor, idle air control valve, o2 sensor, control module, cap rotor, plugs , wires, coolant temp sensor, replace and checked tps, new battery, and starter.

Now what do I do ?

 

Any codes? Timing set correctly? When it doesn't want to start, does it turn over hard? Make any rude noises?

 

Base timing is set at 6 degrees btdc. no codes, no check engine light, no extra noises, cranks over real nicely.

 

What is your fuel pressure? When was the last time fuel filter was changed? I would ensure fuel filter is not clogged by taking it off and trying to blow through it.What was the the Ohms resistance on the injectors? Just throwing it out there.

 

i reset the IAC. car runs fine now , no issues

 

IAC?

 

Idle air control valve

 

Its doing it again. It ran fine for two days.

 

Buddy, I recently had the SAME issue w/ my 92RS. I swapped out the Plugs & threw in a MSD Street-Fire Ignition Coil and BAM no more hard starting. Now addressing the fact we have to press the accelerator peddle....Im at a loss. your thoughts?!?

 

And help me understand how you Reset the IAC? I was only able to remove it and clean it w/ BPC or Carb Cleaner... It seemed to do the trick however I ran out of cleaner so the cleaning was half assed. I will be cleaning it fully this evening and will post an update. Let me know what you find...

 

i guess i will replace the coil, but i am getting good fire.

 

This will help on resetting iac
https://www.thirdgen.org/forums/tech-general-engine/179551-floating-idle.html#post1304610