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Lafonddj
Dodge Dakota
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12/05/2002
14:21:07
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 Subject: 92 3.9 misfire
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My 92 3.9 5 speed has 117K miles and developed a misfire and power loss while driving.
I changed plugs, wires, rotor, cap, coil and no change. Compression on all cylinders 160-170.
If I rev it up while parked, it will pop.
What more can I do?
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Jon
Dodge Dakota
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12/05/2002
14:59:01
| RE: 92 3.9 misfire
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1st i would check the timing and make sure thats ok. 2 other things that can cause your problem are a weak coil or low fuel pressure (ie clogged fuel filter).
-Jon
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NOSDART68
Dodge Dakota
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12/05/2002
19:34:58
| RE: 92 3.9 misfire
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These kind of problems always have a stupid solution. I would check for the simplest things first before i spend any more money. When my truck acted up like that, it was because of the coil. When I added the Jet chip, it aggrevated the popping and misfiring. Since you have already changed the coil, I would test to see if you have fuel pressure by taking the cap off of the fuel rail and pushing the needle like a bicycle intertube.
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Jon
Dodge Dakota
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12/05/2002
19:55:40
| RE: 92 3.9 misfire
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If the truck runs at all he definitely has fuel pressure and gas will spray out of the schrader valve when you press it. You would need to hook up a gauge and make sure you have the right pressures at idle (38-44psi i think), fast idle, and with the engine racing. My guess would be that the coil is going bad with that many miles on it.
-Jon
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1Flamed92Dak
GenII
12/06/2002
10:11:35
| RE: 92 3.9 misfire
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It could be the Crank Trigger Just my 2cents worth
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Lafonddj
Dodge Dakota
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12/07/2002
17:28:17
|  RE: 92 3.9 misfire
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I did previously change the coil. Today I changed the fuel filter and I removed all the fuel injectors. I applied power to each fuel injector and they opened with a clicking sound. I cleaned them and blew compressed air through each one. After all that the engine still had had a misfire. - Dan
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Lafonddj
Dodge Dakota
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12/10/2002
08:36:34
| RE: 92 3.9 misfire
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Any other ideas on this thing? It also pops - like the timing is off. I have the non-adjustable distributor.
I have an appointment with the Dodge Dealership on Friday - I hate to admit defeat. Electronic??
Dan
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Steven
Dodge Dakota
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12/10/2002
21:42:52
| RE: 92 3.9 misfire
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Do you have any trouble codes? If so What?
I would check the crank trigger just as 1flameddak stated.
Check you coil too. Get the manual for your veh if you dont already have it.
Good luck Steven
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Lafonddj
Dodge Dakota
JOIN HERE
12/13/2002
16:00:28
| RE: 92 3.9 misfire
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I got it going. After cleaning the fuel injectors, I put premium gas in it and dry gas and lt it sit a day. After work It ran better, so I drove it and filled it with premium. I figure that I had bad gas or someone put something into my gas.
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doglftsleg
Dodge Dakota
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12/13/2002
21:18:54
| RE: 92 3.9 misfire
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dollars to donuts- ignition modual or distributer pickup.
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