1200 degree temp intermitent cutout
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Senior User
Joined: Apr 2004
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From: Ohio
1200 degree temp intermitent cutout
Just got back from a trip pulling about 8000lbs. 5-people and fully loaded with gear on my 04 350 auto 4x4 with about 24000 miles. While pulling some nice hills the EGTs climbed to about about 1200 with the boost at about 25. Sometimes the motor would stumble or cutout the boost would drop about 15 psi and start up again then a couple seconds later do it again. If I backed out of to about 1100-1150 degrees it didn't seem to do it. But sometimes would surge around the 1100 degree mark. I thought it might be some bad fuel. I didn't had additive in this fill up. I refueled with additive it did it one time but the hills also got easier. On the way down through the same hills it did not have a problem. But it seemed as though the EGTs where a little hotter on the way back. Could this be a problem with the EGR valve opening up and loosing boost or is there a built in EGT limiter on the computer?
Hotshot
Joined: Dec 2003
Posts: 15,368
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From: Stuttgart, Ar
Never heard of an EGT limiter on these computers as I don't think there's even an EGT probe from the factory (quite sure there's not). Do you have A/M exhaust??? that doesn't really seem like an excessive EGT temp to me after lots that I've read. I think you maybe have some other issue. Is your EGR still plugged in??? That wouldn't drop your boost like a wastegate anyway. Sounds like a turbo/VGT sensor problem, or maybe a harness problem again. Is this the first problem you've had with your truck?
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Senior User
Joined: Apr 2004
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From: Ohio
I have a stock exhaust. I still have the EGR valve plugged in. I played with that when i first got it but did not see any real diff. so I left it plugged in. And this is the first sign of any problem I've had.
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