Engine cuts off after running for 45-60mim.

PATTYCAKE

MEMBER
1945 CHEVROLET TAHOE

1998 tahoe 350 4wd. 89,000. Miles. After running the eng. It will cut off after @ 1hr. It will start back and go for a little bit but cuts back off and will keep getting worse. I have replaced the coil and module with no difference. The fuel pump seems to be working ok. I hear it come on when I turn the key. This problem only happens after running for awhle. It seems like some electrical part gets hot and cuts it off but it will allways start back up after it sits for just a few seconds. Sometimes after it starts back it wont take any gas to go and cuts back off. Please if you have any idea's It would be appreciated.

A woman in distress.

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

This one can be a big bear to track down

Go find the MAP sensor below,disconnect it than start the vehicle up and observe its behavior duplicate the problem as per the time frame. If problem no longer exist replace the MAP sensor. Do this and comeback.

You might think am giving you a million circles but am not-we're gonna find this and others might learn from it.

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Friday, September 28th, 2007 AT 8:39 AM

PATTYCAKE

MEMBER
2 POSTS

Thanks for the suggestion we will try this weekend. The only problem I have herd it that the check eng. Light may need to be reset after we unplug the map sensor. Also someone said to try the idle control. Any more suggestions would be very much appreciated and when fixed I will compensate. Thaks so much for your time.

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Friday, September 28th, 2007 AT 1:53 PM

RASMATAZ

MECHANIC
75,992 POSTS

If MAP sensor code pops-up take it to Autozone they'll clear it for you. About the IACV that was the next target-get it clean out-No Go on it-next in line will be the EGR.

It will start back and go for a little bit but cuts back off and will keep getting worse. Is this happening only while engine is idling in Park and moving too.

Good Luck

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Friday, September 28th, 2007 AT 4:43 PM

PEAR69

MECHANIC
1,482 POSTS

I had the same exact problem. It could be the fuel pump electrical connector or the ground for the fuel pump. The connector arcs inside the connection especially if it was ever unpluged and pluged back in without fixing it. When the connector is unplugged, the tongs on the chassy harness spread apart. This causes a loose connection and in time it becomes looser and looser. In time this connection fails intermittently, then it starts to arc and melt down and potentialy cause a fire. I discovered this after my fourth fuel pump change in 6 months and blaiming the fuel pump. Splice in a new chassy fuel pump harness connector and clean up the fuel pump ground thats attatched to the frame cross-member just in front of the fuel tank--it's a black wire that goes from the chassy harness connector directly to the frame.

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Friday, November 2nd, 2007 AT 12:18 AM