Dies when warm

Lugnut · #1 (**permalink**) 03-30-2008, 12:04 PM

I've been doing a lot of searching but most of what I see is the immediate start/stall or cold-starting problem.

I finally got my GTV6 running this morning! New plugs, wires, coil, hoses, plenum couplers, battery... Fired it up and VROOOOM!! It's running GREAT! Lots of power, great idle, fabulous pull all the way to redline. Until it gets warm, that is...

Once the car warms up, it just stalls. Dies. Nada. I can immediately fire it back up but it dies again after a minute or two. If I let it cool down, it fires right up, gets back under way, and once it starts warming up again, dead!

I went through the L-Jet writeup, changed all the hoses, checked all the grounds... I haven't pulled off the AAV yet but would it affect anything except my cold start? I'm not having any problems at all with my cold start.

I guess I could enjoy the car by running it around the block and trying to get home before it dies, but that's getting old.

What should I be looking at here?

**GreyGTV6** · #2 (**permalink**) 03-30-2008, 02:26 PM

If you have done the L-jet and hoses that part seems ok. If you are getting gas through then for what it's worth I would try a new coil. Electrics are funny and once it warms it may not work as it should. I chased hard starting and rough running for more than 6 months and it was the coil that had yanked my chain the whole time. I saw and heard the spark, but the car would not run.

Just a thought.

Lugnut · #3 (**permalink**) 03-30-2008, 02:29 PM

I just put on a brand new coil. You think there might be an issue with the new one?

**GreyGTV6** · #4 (**permalink**) 03-30-2008, 02:35 PM

If the symptoms are the same with both coils it is unlikely that they have the exact same problem. When warm, are you getting spark and gas (or petrol depending on where you live)?

Lugnut · #5 (**permalink**) 03-30-2008, 02:52 PM

I am guessing it must be fuel related. I just started it up, pulled #5, and it sparks all the way til the motor dies.

Lugnut · #6 (**permalink**) 03-31-2008, 06:36 AM

So could the AAV be causing my stalling out when warm?
What else affects fuel when the engine warms up? I pulled the plug on the cold start injector and it had no effect, and there is no strong gas smell. I don't think it's flooding. I think the fuel is being cut off.

**papajam** · #7 (**permalink**) 03-31-2008, 07:24 AM

Quote:

Originally Posted by Lugnut

What else affects fuel when the engine warms up?

Lugnut · #8 (**permalink**) 03-31-2008, 09:26 PM

How can I tell whether this is the problem, short of just buying a new one and popping it in?
The L-Jet article describes a cold reading and a warm reading, there's no way I'll get this thing warm. I can't run it for that long.
When I unplug the CTS, the car immediately stumbles and subsequently dies.

Now something I've noticed when I let it run for a while (well, as long a while as it will, a couple minutes) is that the idle will raise from about 1100 or 1200 up to about 1800 and then it'll just quit.

GTVis4me · #9 (**permalink**) 04-01-2008, 09:22 AM

If the AAV is not closing after warm up it could be ruining the air/fuel ratio causing it to stall. Mine never opens and it starts ok I just have to let it warm up before driving it otherwise it hesitates.

**papajam** · #10 (**permalink**) 04-01-2008, 09:28 AM

The CTS can be tested by first removing it from the engine. Stick the bulb into a pot of water, hook up an ohmmeter to the sensor contacts then heat the water. Compare the resistance at x temperatures against the charted specs.

Lugnut · #11 (**permalink**) 04-02-2008, 06:52 PM

Replaced the CTS today. No change.

I'll pull the AAV off and check it.

Lugnut · #12 (**permalink**) 04-26-2008, 03:11 PM

Ok, I'm bringing this back after a month.
I have driven my GTV6 six times now.
I had removed the AAV and plugged the hoses and it was running great. I adjusted the idle and it ran even better. Then I took it for a pretty good drive.
I drove it to work and back three times, including the day of the CAROC meeting.
Now, it's back to exactly the same problem. I haven't changed anything since the last good drive and now it's dying again.
It'll start up and as soon as it gets warm, it quits.

This is after a new ignition coil, wires, plugs, rotor, cap, all new silicon hoses, coolant temp sensor.

I'm one more failure away from having this thing hauled away. I can't decide whether smashing it into bits will make me feel better than losing the $1100 or so I have in the car will make me feel bad.

What is next here? What am I missing?

ALFA NOLA · #13 (**permalink**) 04-26-2008, 10:47 PM

Check connections and clean ALL grounds that you can see... there's a few on the GTV-6. Make sure the connections on the coil are clean, check the pulse generator connection (the sensor w/ the wire coming out below the cap) on the distributor.... and take the combi relay off and clean it good.... then clean it again.

Lugnut · #14 (**permalink**) 05-08-2008, 09:20 PM

OK, coil cleaned. Combi relay cleaned. Pulse generator connection cleaned. Grounds cleaned. Plugs and sockets on CTS, CSI, AFM, TPS cleaned.
Same symptoms.
Start up. Runs for about 2 minutes. Dead.

Slackjaw · #15 (**permalink**) 05-09-2008, 11:58 PM

Maybe a clogged fuel filter?