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Post by chevykillerx13 on Dec 20, 2018 10:16:42 GMT -5
I’ve got a 1999 Dodge Ram 2500. It’s an 8.0 V10/automatic 4wd truck. Absolutely love it, plenty of power and for what it is, decent fuel economy... until it started overfueling. It will pop out of the exhaust, hesitate, and now gets roughly 6-7mpg. Overdrive is a dream most of the time. Sometimes it will let loose a Big Bang, and run like a brand new pickup. I’ve replaced the entire fuel system, both upstream O2 sensors, and the ECU. No codes are being thrown. Compression is at about 130 per cylinder with the biggest difference being 7lbs between two cylinders. No burnt valves.
Upon changing the ECU, the cruise control and fog lights stopped working, the cruise light doesn’t even come on. Donor truck was almost identical except for the donor being a 98 regular cab long bed and mine a 99 Quad cab short bed. All other options are the same. I’d like to get this truck running right before I send it to the body shop to have cab corners replaced and the truck repainted.
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boom61
Feature Winner
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Post by boom61 on Dec 22, 2018 5:27:02 GMT -5
Have you checked for clogged Catalytic converter(s)?
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Post by chevykillerx13 on Dec 22, 2018 10:33:55 GMT -5
It doesn’t have Cats. Previous owner cut them off.
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Deleted
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Post by Deleted on Dec 22, 2018 10:53:05 GMT -5
I’d check vaccums,seems every damn thing on a dodge an ford run off vacuum
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Deleted
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Post by Deleted on Dec 22, 2018 10:55:01 GMT -5
Is the truck getting up to the right operating temp?
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hicks66
Heat Winner
bumper
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Post by hicks66 on Dec 22, 2018 11:44:10 GMT -5
If you didn't have this problem before the ecu change I would have to suspect a problem there. It could be sending default values for either o2 readings or temp, air flow, or manifold pressure, tps If you could fine the voltage ranges for these circuits you could see if they're in range. Also any of these should send a fault code you could find with a scan tool but it doesn't always work like that so good luck.
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Post by chevykillerx13 on Dec 24, 2018 20:23:20 GMT -5
Yes, it’s getting to operating temp. And it’s acted the same with both ECUS however the original ecu wouldn’t throw any codes..... even with three random spark plugs unplugged.
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boom61
Feature Winner
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Post by boom61 on Dec 25, 2018 0:00:48 GMT -5
Does it have separate temp sensors for gauge and pcm? Could be getting to temp but if it isn't telling the pcm it is to temp it will still run rich. Have seen before a temp sensor tell the computer it is -40 on an 80degree day and will dump fuel.
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Post by cowdoc on Dec 25, 2018 22:14:08 GMT -5
Clean or replace MAF sensor, my v10 mud truck will run poorly if it gets dirty
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Post by chevykillerx13 on Jan 28, 2019 10:17:11 GMT -5
Coolant system started to over pressurize a couple days after this post so it’s been parked until my parts come in. I believe it’s a bad head gasket on the drivers side, should be fun to get out without pulling the entire engine. Doesn’t really solve the over fueling issue in my mind but doesn’t help anything.
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Post by chevykillerx13 on Aug 31, 2020 4:59:05 GMT -5
Over a year and a half later, I’ve messed with the truck a few times but have lost interest. I’ve since replaced the fuel injectors, and both temperature sensors, and still the same issues. For some reason it kills me to think of selling the old pig and I’m hellbent on figuring it out. Could this be something ridiculous like a PCV valve? I’ve noticed the air cleaner housing has oil in it.
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