Thread: new guy

ok this one has me scratching my head. 93 prix 100,000 miles new plugs,coils,
runs great until it warms up the doesnt want too run, any ideas ?
Picked it up from a friend as a project, he was goin too call a salvage and i saved it, just want too get it runnin good right now so i can save up for a swap,

....relax. People aren't on here 24/7. It may take a bit more than 5 minutes for someone to respond. Anyway...

What brand are the replacement coils you put on? I'd start by having those checked out at any of the many parts stores that check for free in spite of being new. While you're at it, have the ignition control module checked, too. If that looks good, I would have the injectors checked out next. Those are the most common failures for what you described.

Check out the stuff I listed. I can almost guarantee it's one of those. I'm presuming this is the 3.1? If so, they're legendary for injectors going out, and in many instances, they'll display the same exact symptoms you described.

I have the same problem, only when it got hot it wouldn't even crank. I swapped ecms and it cranks when warming up, but won't start. new ignition module, crank sensor, plugs, wires, i think the coilpacks are good(at least that's what the guy told me..my wife wants this car outta here and I do too, so i can get started on my camaros' 350 tbi swap yay!) but I'll check them out. Who would have guessed that the first thread in a forum that I've been a member of for about oh, 4 minutes would be so fruitful. good luck on your rig bud.

editkay, so do I have two crank sensors? I only found one by the firewall at the bottom backside of the block. 1990 grand prix

does the electrical go 1st or mechanical when it stalls out?

93Prix - Even the replaced coils may be bad, especially with the track record of lessor brands like the ones sold at Murray's, Auto Zone, Advanced Auto, etc. Have all of them checked regardless of whether they've been replaced, or not. Your symptoms can still be one or more coils, the ignition control module (don't forget to pull that off, and take it in with you to get checked when you remove the coils), or one or more injectors. The way the old MPFI system was set up, if one injector went out on either side of the rail, all 3 would stop on that side. There is a slim chance it could be your crank position sensor not sending a strong enough signal, but I would leave that as a last possibility.

Osirus - You only have one CPS.

I had a camaro that was doing the same thing, kept stalling out on me. I ran in circles around the ignition components and sensors. I think you should check the fuel pressure. there should be a shrader valve on the end of the fuel rail to connect a guage. I would also say the coils could be suspect even if new.

When it stalls does it sputter out and die, or just cutt off like you turned it off?

just stops im finally gonna work on it, havent had enough time

If there's a junkyard near you, I would snag an original GM coil off the newest car you can find. Pretty much all GMs use the same coils. Run that for a while, and see if it doesn't cure the problem. You're just going to have to rule things out one at a time like this.