02 Z/28 dies when engine warms up.

**Danger731** · 12-18-2009, 07:01 PM

This has been going on for months. The car starts and runs strong. As soon as it gets to operating temperature it shuts down. I thought a fuel pump issue so I replaced the pump. Car started fine, ran strong until it got to operating temperature then just shut down. any ideas ?

**kevnstac** · 12-18-2009, 07:43 PM

I had a friend who had similar problems. I'm not mechanic, nor expert but I thought he said something about changing his coil packs and the problem went away.

**kevnstac** · 12-18-2009, 07:50 PM

Here's another idea. I had a Grand Am that did that back in 92. That took a crank sensor. It used to shut off after about 15 minutes of running.

**silverWS6** · 12-18-2009, 08:27 PM

Will it start up again?

**Danger731** · 12-18-2009, 09:05 PM

after it cools off

**bigrondownhiller** · 12-20-2009, 01:36 PM

You could just start throwing parts at it or bring it to someone who can run it on a scanner or data log it. That will help identify the problem faster.

**Danger731** · 12-20-2009, 01:56 PM

yeah the simplest cure failed, I needed to upgrade the pump so I was hoping ....

**DaddySS** · 12-20-2009, 02:35 PM

Yeah, this sounds like one for the scanner. It sounds like the expansion of the block might be causing a problem with the sensors but you don't want to be chasing this one. Take it to a dealer or someone with a scanner and let them warm it up and see what goes away or see if it has logged any errors.

**cammed goat** · 12-20-2009, 02:37 PM

My car did this but only after I shut it off when warm. When refired, it would run for 5 seconds then shut down and would run fine after another startup. Had the car tuned and all is fine now. Any mods to OPs?

**SOMbitch** · 12-20-2009, 02:38 PM

Maybe it is a MAF issue. When it's cold you are in open loop and once it warms up it switches over to closed loop and that seems to be when your problem occurs.... You need a better tool than just a code reader you need to look at it with something like a Tech II or Snap on scan tool. They can do a lot more than just read codes.....

**Danger731** · 12-21-2009, 08:33 AM

yeah it looks like the dealer $$$$$$$$

**SOMbitch** · 12-21-2009, 02:36 PM

Originally Posted by Danger731

yeah it looks like the dealer $$$$$$$$

Haha!!! I feel for the guy but yeah it could keep him from chasing his tail... I am lucky.... I know a guy from hanging at the track that will look at mine for no $$$ with a Snap on and it will do what a Tech II will.....

Edit...HP tuners, EFI Live etc...will work too....

**Danger731** · 12-21-2009, 09:08 PM

Yeah Ed said he might come by Sunday

**Hi-Po** · 12-21-2009, 09:13 PM

Get HPT on it and see what it is doing

**Danger731** · 12-30-2009, 11:09 AM

Well no codes, everything from what I can tell seems fine. MAF sends a signal as does the o2 sensors.

***Ed Blown Vert*** · 12-30-2009, 11:15 AM

Were you able to get it scanned?

**Danger731** · 12-30-2009, 09:09 PM

Originally Posted by Ed Blown Vert

Were you able to get it scanned?

Yeah no codes, maybe this weekend if you are free you can try to figure it out. Next week it has to go in, hopefully you got some mojo.....save me some $$$$

The scanner I borrowed scans everything, but who knows what the f im lookin at

**SOMbitch** · 12-31-2009, 05:33 AM

Make sure you post up what you find out. This is interesting......

**Danger731** · 12-31-2009, 06:09 AM

Will do , this is a wierd one

***Ed Blown Vert*** · 12-31-2009, 06:50 AM

Originally Posted by SOMbitch

Maybe it is a MAF issue. When it's cold you are in open loop and once it warms up it switches over to closed loop and that seems to be when your problem occurs.... You need a better tool than just a code reader you need to look at it with something like a Tech II or Snap on scan tool. They can do a lot more than just read codes.....

That's sounds resonable. I wonder if its the 02 sensors??

I can try keeping it in OL and see if they will help.