After warming up 94 Q45

[BlackMajik]

I had my Q45 for about a year now after buyin it from a friend I do most of my own but I can't figure out why when in the morning when I start the car it idles fine so I let the car warm up but after warming up I turn the engine off and try to start it again it starts normally but it turns off immediately after starting has anyone had this problem and if so please inform me on how to fix this I would greatly appreciate anyone if they can help me.

[goody90q45]

After it shuts down does it start normally and run fine for the rest of the day? How many miles? Idle smoothly? Always good acceleration? Recent maintenance?

Is your MAF connector loose? Any (green) corrosion present? Have the connections been cleaned and tightened? It shouldn't wiggle up or down more than about 1/8".

Answering these questions will help us diagnose the problem. Welcome to NICO.

[BlackMajik]

Yes it does start normally and after pressing the accelerator a couple of times it runs fines the connector does wiggle a bit I didn't notice any green corrosion on MAF by the way it has 170K miles on it

[goody90q45]

While it is warming up is the idle fluctuating up and down at all or just decreasing as it warms up? Have the throttle body and/or IAC valve (idle control) ever been removed and cleaned? What RPM are you running at idle when warmed up?

The MAF connector itself needs to be clean and the pins tight. They can be cleaned with a toothbrush and penetrating oil. All 3 should look like the middle pin.

[goody90q45]

Yes it does start normally and after pressing the accelerator a couple of times...

Also check the throttle position sensor connector. It will be a black connector similar in size to the MAF connector but attached to the TPS on the throttle body at the opposite end of the air tube. Do the same pin cleaning and tightening as described for the MAF connector.

[BlackMajik]

After checking MAF sensor connector I noticed that the white wire had broke and was dissconnected I repaired the problem and it seems to be working fine thanks a lot for the info this forum is a Godsend....

[goody90q45]

That was a lucky find and a lucky lead on my part. Like the old saying goes- "Sometimes even a blind squirrel finds nuts".