Hows it going, This is my problem, it is an 89 Formula 350 TPI and the problem is that i start it up it runs and then when i shut it off it wont restart. I have taken it to a mechanic and he didnt find a problem. So i have cleaned the distibutor, put a new pick up, electronic module, cap, rotor, and spark plugs. Also i have set the timing, I have read other trends that it could be the computer or vats or some wiring issues. Cuz i have changed out the ingnition, vats, and computer before. Any ideas? before i change out anything else.

Thanks

 

If its only when the motor has warmed up it could be your starter solenoid. I saw a thread on here somewhere where the solenoid would get to hot and cause a no start situation. I also herd something about a possible vapor lock situation in that thread also. Ill try to see if I can find that thread for you.

 

The car turns over, its not the starter.

 

i have the same problem....but i have to ask. If you let your car sit for 3-4 hours doest it refire like normal? Mine does that

Everybody is telling me the injectors have gone south on my car...yours might have to

 

Yes, it does that, it sits there and it will restart and then you run it for a while and shut it off and wont start, now it takes like a whole day to restart

 

Check the resistance to the injectors before and after you run the car. Compare the readings and see if they are going bad. If needed, I might have a set of injectors for sale.

 

ohm check injectors
pressure check fuel system
verify spark


if you turn on the car and drive around does it ever just turn off on you?

 

yes, it runs but the it shut off and now restart

 

but if you sit with your foot on the pedal the whole time for as long as possible will it still turn off on you?

i had a problem where a bad iacv would let my car turn on and drive like normal till it warmed up to temperature then it would turn off and not want to turn on again, but it would crank over, so if you know someone with a spare iacv or the same car just borrow theirs , or get yours checked, its really easy to take it off, you can get it off with channel locks if your careful or an adjustable wrench.

other than that

is your car running rich? does your oil smell like gas really strong? black or grey smoke coming out of the tailpipe? any trouble codes? i would try the idle are control valve seeing as how you went and re did the whole ignition system. also get your fuel system pressure checked to see that it holds pressure and that its at the correct pressure.

 

HEY MY CAR DOES THE SAME THING SO FAR I FIGURED OUT IF I UNPLUG MY COOLANT SENSOR IT WILL FIRE UP SO IVE BEEN RUNNING MY UNPLUG WITCH MAKE IT RUNS RICH BECAUSE THE COMPUTER THINKS ITS AT COLD TEMP ALL THE TIME I REPLACED MY SENSOR BUT NO LUCK SO IM STILL TRING TO FIGURE IT OUT BUT BEFORE YOU START REPLACING ALOT OF STUFF UNPLUG IT AND SEE IF IT HELPS

 

Hey guys! My 89 Iroc 5.7 is doing the same thing. It seems if I start it up when its cold and I run to the store and come back out itll start back up but after it being ran 15-20 min when I got home just about an hour ago if I shut it off its gonna take awhile at least hour or so before it will start up, sometimes longer. Im working on it right now actually because its doing the same thing good thing is I got back home and its sitting outside, instead of out in town. Mine runs good when after it starts, it dont shut off on me or nothing while im driving. I just put new Bosh III 22lb. Injectors from FIC not to long ago. Im running pretty much new MSD ignition components with wires and all. I just put a new starter and solenoid on it about couple hundred miles ago. Some troubleshootin I did was:
Test the battery, I tested it 3 times all ran good my reading was 12.4 V with 833 CA
Test the alternator
I unplugged my ECU let it sit overnight.
I have not yet checked the fuel pressure system, im leaning on that next.
Ill try the unplugging the cool temp sensor and see how it works.

Thanks and good luck to all and me . Ill keep ya posted if I figure anything out.

Update:
Well I just went outside after posting the above reply and it fired right up after sitting lol. I decided to let it heat up and run for about half hour. I reved it up a couple times, shut it off and it started back up while it was hot at 200 deg., I shut it off and started it back up a couple of times, its strange. I was going to try unplugging the cool temp sensor if it did not start but it seems to be starting fine ill try it next time it does it. Thnx Guys!

 

Unplugging the coolant temp sensor won't cause the car to not start. The coolant temp sensor is there to monitor the temp of the coolant and add or remove fuel when needed at certain temps.

 

I NEVER SIAD IT WILL CAUSE YOUR CAR NOT TO START I SAID UNPLUG IT TO SEE IF YOUR CAR WILL START IF MY DOESNT START I UNPLUG THE COOLANT SENSOR AND IT FIRES RIGHT UP NOT SURE WHY YET I REPLACED THE SENSOR BUT STILL NO LUCK

 

Well a new update! I was outside messing aroudn with the car and it wasnt starting when it "was hot", but it got to where it wasnt starting at all, when it was cold or hot. I took the battery in to my local auto parts store again! this time it read "good" but low charge. I had them fully charge it and with the two settings on the tester they have we tested it with fully charged setting and the regular setting again. So we did two readings after. At the "fully charged" tester it read "bad". But when we did just a regular reading again it read "good" but low charge again, after a full charge. So scenario was it was not holding a charge. I bought a new battery with 700 CCA and 875 CA. Popped it in the car and it fired right up and has started back up everytime since I have cut off. Ill continue to monitor it performance, just thought I would post. Thanks guys!

 

that very same problem happened to me. damn kragen.

 

Kragen??? Well it seemed it wasnt only the battery although the battery was bad this new one only worked for awhile then quit. Itll go back to starting up only after I jump it. Something has got to be running the battery down. Alternator read at 14.6, was messing around with the alarm because it runs a hot wire to the positive battery post and when I switched it off it showed me the same symptoms. But when I turned it back on it started right up. Im going to try taking it out and see what it does. But it still has me puzzled to where if the alarm was on the whole time why did I need to jump it? Ill post back up when I get some results, thanks guys! Oh btw if you have any suggestions, be my guest.

 

Odd that it would still turn over but wouldn't start with a batt low on the cca. I just bought a new batt cause my cca were shot. With that the start makes a rapid rattle kinda clicking sound rather than turning the whole motor over.

Random info for anyone.. I once had this holly carb that would leak gas into the intake manifold after a short drive. I was not aware that after I parked my car, the fuel pressure would push gas through the carb into the intake manifold flooding the engine! I'd have to pop off the air cleaner and let some fuel evaporate before I could crank it up, or just wait overnight. Lol even worst that I was trying to give it gas to start it thinking it needed more when it was actually flooded. I wonder if that is possible with a fuel injected system, a tpi.

 

Well yea although yours was flooded mine would not turn over one bit. I would hear the fuel pump prime, the pump relay click, ignition comes on and then it just tacs out not turning over or nothing. Its like its not even engaging the starter. I know on my TPI if I tap the pedal before starting it, it will result in flooding, of course I would have to tap it more than a couple of times. I was told that I did not need to tap the pedal at all because of it being a TPI motor. Thanks for the reply

 

yeah, i dunno, maybe they dont rotate their battery stock or maybe the batteries they sell are old. but i put in a new battery in my car it sat for acouple days, then i went to make sure the charge on the battery was still good, and i cranked it, the car would turn on, and it would stay on with my foot pressing the gas, but if i let off it would die. the problem fixed when i got a new battery.

 

I've been having the same problem with my LB9. I can start it up without a problem when its cold, but you let it run for more then 15 minutes it will not start. The only thing that was changed electronic wise were the stock injectors replaced with 24# ones for my mods. i did an ohm test but they all fell within specs and equal across all 8. Maybe too low of fuel pressure? I was told that 50psi should be plenty..

 

Have any of you guys with the hot restart pronlem found out what it was? Just asking cause I'm having the same problem with a 92' camaro.

 

hey i fixed mine problem i had 2 bad injectors i just put mine back together today it has more power than ever before...i ohm tested mine and 2 of my injectors was ver low compare to the rest so i took a chance and replaced them and it worked out so far

 

Well as of right now I am looking into my kill switch thats on my car and I was looking at some of my wiring thats under the dash and what not.... tightening up couple of grounds and trying to organize the mess the previous owner had made. Its been acting a lot better but it still acts up and not starting at times... all I do is fiddle with that switch and it starts up. Im looking at replacing it or just doing a delete. Ill wait to post back when I know for sure what my certain issue is.

 

Well I've went over everything from the ignition, fuel system to different Bins and this thing still don't want to start on it's on when warmed up without a little shot of starter fluid. This is a pain because when started the car runs like a champ. The owner wants to drive the car but with it not starting on it's own he is not willing to take it out.