I have a 90 formula 5.7 tpi, 79000 miles. Car has fuel pressure but takes a long crank or two to start when cold. Once it is warm it is fine. I did replace the temp sensor and fuel pump relay. There is fuel pressure as son as I turn the key, you can hear pump run.

What should I look for next?

Jerry

 

so it fires up right away when warm?

 

same problem on my l98, cant figure it out...,

 

-deleted

 

I did also replace that as well. The fuel pump does kick in right away. I put a gauge on it and that appears to be fine. I am going to check to see if it has spark. Once it is hot it has no issue. Maybe the oil sending unit is getting plugged?

 

My 89 used to do the same thing, I found if I let crank for a half a second and stopped then tried again, it fired right up.

 

No problem when it is warm.

 

Did anyone find a solutions to this? I have the same issue with my 89 350TPI. Did you try changing your fuel pump relay?

 

I first replaced the temp sensor, then moved onto the relay. The last thing I just did was changed oil and put a new oil pressure switch in and it got better.

 

Temp sensor is on the driver side block correct? Is the oil pressure switch the sensor that is connected right above the oil filter? If so, I already changed that. Only thing I haven't done is the temp sensor and fuel pump relay...I think my temp sensor if fine though.

 

under the throttle body in the front of the intake. The oil pressure switch is the one above the oil filter.

 

If my fuel pump always primes before starting like it should, then could the fuel pump relay still be at fault here? Only takes long to start when cold, when warm it starts right up.

 

From what I am finding out is it is the injectors are not pulsating. Mine too has correct fuel pressure when I hit the key.

 

What would cause them not to pulsate? After 5-8 seconds the car eventually starts so they had to pulsate at some point to start. Can you have a bad fuel pump relay and still get primed with the turn of the key? (Also for the injectors to pulsate I believe you are supposed to get a signal at the end of every spark from the ignition module, however, if the ignition module was bad they usually act up when they are hot not cold.) The car does have a little bit of a gas smell, then again the cats are out, but I don't have a cold start injector because it's 89 and the SES light has not thrown any codes of running rich, I wonder if that has anything to do with the long cold starts. My main question is how can a fuel pump relay be bad if the car still primes every time you turn the key? Can someone shed a little light on this matter. I've spent hours reading threads and it's mostly with people that are pre-89 and have a cold start injector which I do not have.

 

This is where I have stalled and can't find out myself. I have ben out of the late model stuff for a while and just picked up this formula 2 months ago. Somethings gotta fix it just can't figure it out. Someone on the camaro site had this same problem and replaced his ignition switch and said his cars is fine now.

 

I'm tempted to replace the injectors too. If I ohm out all the injectors and they are within spec, can they still be faulty? I guess they can be leaky...

 

if everything looks good and you only have a cold long start. put a fuel pressure tester on your car. start the car look at your reading on the gauge. make a note of the pressure. turn the car off. leave the pressure tester on the car. come back to the car in a half an hour to a hour. if the pressure drops your fuel pressure regulator is bad and that is what is causing the long starts!! come on guys think smarter not harder!!

 

is it just me or does this not make sense?

Here's the deal, fuel pressure is good, 43 psi, key on prior to starting a cold engine. tagta3 and I both have brand new Bosch III', but the problem still persists. While cranking the engine for an eternity, the fuel pressure stays between 40-43psi. The injectors pulse, verified with a noid light. Once the car finally starts, it runs excellent. No codes, fule pressure is at 40psi. Shut the car off and it'll start immediately everytime until the car cools down over night.

Now, fuel pressure is NOT the probelm. That much we have figured out. What we don't know is what the heck else could be the problem. By the way, I have a new CTS, IAC, TPS, O2, coil, plugs, wires, cap, rotor. TPS and minimum air adjusted properly. I have adjusted base timing from 0-6 degrees. I am starting to think about the ignition module, or swapping the CTS again. Just a guess... Someone figure this out.

 

I have read that someone on the camaro site had same problem and swaped out the ignition switch and problem went away. I have not had any time to do anything more. Been driving it quite a bit.

 

I know what you mean. Mine is a DD as well.

A new one from Autozone is $42. This is what it says about ICM problems.
"Controls dwell or "on" time of ignition coils primary winding.
When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, inconsistent transmission shift points, spark plug fouling, catalytic converter failure, poor fuel economy or CEL/MIL illumination."

Hmmm...

 

Is that for the ignition switch or the module?

 

ICM= Ignition Control Module

http://www.autozone.com/autozone/par.../N-ihjvoZ9n80t

 

I still have the same problem as this but it was ten times worse before going with bbk adjustable FPR. other than that i have a new smog pump, 02 sensor, CTS, fuel pump relay, oil sensor/switch (the single wire bell shaped one by dist,) knock sensor, powermaster starter, complete distributor, iCM, IGN Coil, MSD Wires, Denso iridium plugs, and i did replace the IGN switch too ( a "PITA") regardless i still get the long crank (takes two long cranks before it starts up when cold,) starts up in 1.5 seconds or less when warm/hot, my pump primes ok too. my GTA drives just great for the most part I have a little hesitation sometimes. i am going to adjust timing again, im set at 10 deg right now, but i will go back to 6 deg and trial and error up to 9 deg to try to rule it out. i smell a little fuel sometimes too. fixed a needle sized whole at the bottom of my fuel tank earlier so the smell is not nearly as bad.

 

you are not hearing words i am typing!!! when the car sits overnight the fuel pressure bleeds down to 0 a BIG FAT 0!!!! YOUR FUEL PRESSURE REGULATOR IS BAD REPLACE IT!!!!

 

i replaced the cold start switch and no more long cranks. hope this helps anyone on here who has tried replacing the fpr to no avail.

 

Mine does the same thing. From my understanding it has to do with the fuel injectors.