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01:06:52 - 12/20/2024
General Dakota Board
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Dabald
Dodge Dakota
JOIN HERE
2/27/2007
23:12:26
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 Subject: Overheating and running rich
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Message:
Message:
I am trying to diagnosis a "lack of cooling" problem on my 2000 5.9 R/T. Any suggestions, would be really helpful!
The truck never overheated, before I put in the ATI Procharger and the B&G computer flash.
I am now thinking the B&G flash is looking for the signal from my O2 sensor, which I plugged with a O2 simulator, when the exhaust was cut out...
Here's what it's doing:
It runs fine, if I reset the ECU, and drive under 3/4 throttle. The temp stays level. If I rev it over say 4000 or to 5000, it sends the temp gauge north to where I must put it in neutral and coast down, near overheat? It also starts to smoke.
I have to let it cool, check fluid, etc.
I just installed a new Mopar thermostat today.
Test drive, did it again.
Once it overheats, the motor smokes gray smoke hard! If I reset the ECU, problem disappears. Doesn't seem to reappear, until heavy acceleration or high revs are encountered. Maybe the ECU is looking for a rich mixture, doesn't ever see it, and then continues to run rich to compensate?
Like I said, It did not do this before the ATI and B&G flash.
I plan on having a bung re-welded into the exhaust, and install a new O2 sensor and re-conect the harness. I hope this does it?
Any ideas?
Any suggestions would be helpful?
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crow318
Dodge Dakota
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3/01/2007
08:59:00
| RE: Overheating and running rich
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Message:
When you check fluids, are you low on anything?
What does the smoke smell like?
Have you looked at spark plugs?
After the overheat, does it smoke even once it has cooled?
Unfortunatly, boost = blown head gaskets. I'm not saying that is your problem, but it could be. Answers to the above questions could help narrow things down.
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Kowalski
GenIII
3/01/2007
11:50:34
| RE: Overheating and running rich
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Message:
Sounds like good advice from crow318. I'm also wondering if you checked the plugs to determine if it really is running rich. Wouldn't an engine running lean be more likely to overheat ? Getting enough fuel to go with the boost ?
Lead, follow, or get out of the way
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jayb
Dodge Dakota
JOIN HERE
3/02/2007
10:42:15
| RE: Overheating and running rich
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Message:
you need to reinstall your front o2 sensor. at the least it will regulate the fuel mixture. keep the rear o2 sensor plugged with the sim if you want to. if this doesnt fix it, at least you will get better mileage.
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