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Joe Lambert
Dodge Dakota
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7/17/2004
20:45:12
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 Subject: 1992 V6 running rough, tried everything.
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I bought a 1992 V6 Dakota, the prev owner had a rebuilt engine put in about 4k miles ago. It's running rough, but accelerates great, but when you hit a constant speed you feel it again. Feels like a vaccum leak but I checked all the lines visually and using spray. Changed plugs, wires, coil, cap, and rotar. #6 plug was real black but not wet. Had a shop look at it and they don't know. I did find the compression to be 120 on the 3 passenger side pistons, but 150 on the 3 drivers side pistons. Computer has no codes. EGR tests good too. The timing is all over the place, the mark moves about an inch from side to side using a timing light. I used a half a tank of gas just driving about 30 miles. It has headers and a flow master, I think the cat converter is hollow too. Any help would be great.
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J and J Auto
GenII
7/17/2004
20:53:38
|  RE: 1992 V6 running rough, tried everything.
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Message:
#6 plug was real black
sounds like a leaky injector on that cyl
also have auto zone or someone with a scanner
check the o2 sensor if bad it will hit the gas
mileage hard
Also check TPS and IAT sensor
Larry
J&J Auto
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Keith Hansen
Dodge Dakota
JOIN HERE
7/18/2004
16:42:23
| RE: 1992 V6 running rough, tried everything.
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The timing is supposed to be all over the place as it's constantly being adjusted by the computer in an effort to maintain the correct air-fuel ratio.
Keith
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Ford1
Dodge Dakota
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7/19/2004
11:15:46
|  RE: 1992 V6 running rough, tried everything.
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Message:
Have you tried a Ford??
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Joe Lambert
Dodge Dakota
JOIN HERE
7/19/2004
15:55:50
| More info on running rough
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Thanks Larry and Keith for the replies and the advice. I tried a couple more things; I pulled the IAT sensor and cleaned it, however there wasn't any carbon build-up on it. I wasn't aware that the timing was supposed to be all over the place. I bought the Haynes manual for it and it says to disconnect the temperature sensor (the one to the computer) and set the timing to 10 degrees before TDC. I'm not sure how someone could do that if the timing is supposed to be all over the place, so I'm a little confused on that. I did check the fuel injectors by disconnecting them one at a time and seeing if the engine changed. When I pulled #6 there was no change. So I swapped it with #4 and the problem followed the injector, so I need to get a new one of those. What's weird is that when I disconnect the fuel injector or plug wire (one at a time) on pistons #2, #4, or #6 there's less of a difference than if I do the same thing to pistons #1, #3, or #5. What I mean is if I pull the plug wire (or injector wire) off cylinder #1, the engine runs worse. If I plug it back on and then pull #2, or #4, or #6 there's less of, or no, change. It's like that whole side is weak. Does that make any sense? Could 1 bad injector affect the whole side? Also, is it okay for the compression on that side to be 120 while the compression on the other side is 150? The problem isn't just at idle, but it's all the time. Thanks again for the help. As far as trying a Ford... I'll never be that desperate. ;)
Joe
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xmr
GenIII
7/19/2004
16:48:45
| RE: 1992 V6 running rough, tried everything.
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Joe:
You need to replace the bad injector and run a wet compression test. Just squirt a couple of squirts of oil in the cylinders and get a reading if the passenger side is still low you have a head problem on that side bad valves, head gasket etc. Twenty pounds is not a lot of variance but it seems strange that every cylinder on one side would be low.
'98 cc auto /Home brew cold air with K&N,Dynomax, Superchip Tuner, 1.7 RR,, F&B tb. NAPA cap and rotor, 3923 plugs,tps mod,relocated iat, 180 t'stat, Crankshaft sensor mod.,PVI,Ported and Polished manifold, bosch injectors,
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Tony Frye
Dodge Dakota
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7/19/2004
18:25:31
| RE: 1992 V6 running rough, tried everything.
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i would think if you had a leaky injector your oil would smell like fuel as well as oil. but i ran across the same problems with mine. the cure was replacing the brass distibutor bushing. remove your dist. and remove the bras bushing from your block and install a new one. i did this to both of my 93 trucks. i hope this helps.
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Dean
Dodge Dakota
JOIN HERE
7/19/2004
20:36:09
| RE: 1992 V6 running rough, tried everything.
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Timing shouldn't be "all over the place". You might need a rebuilt distributor. They aren't expensive for this model.
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Joe Lambert
Dodge Dakota
JOIN HERE
7/26/2004
14:17:07
| RE: 1992 V6 running rough, FOUND THE PROBLEM
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I found the problem. It turned out to be two different things. The main thing it turned out to be was a vacuum leak inside the engine. Dodge 6 cylinder engines are known to have a problem with developing vacuum leaks in a pan gasket that's on the underside of the intake manifold. If you look down the throttle body and see oil, it's evidence of that particular vacuum leak. I looked down the throttle body and could see that it was wet with oil inside. So I pulled the intake manifold off, flipped it over, and removed the pan from the bottom. And sure enough it had developed a leak. You could see where the gasket wasn't sealing anymore and you could see where the oil was getting into the intake manifold. I replaced that gasket and the manifold gaskets and that fixed the leak. There was also a bad injector, but the major problem was that vacuum leak. Thanks guys for all the help.
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