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21:45:28 - 03/21/2010
V6 Dakotas
| From | Message |
Van Guy
Dodge Dakota
JOIN HERE
11/09/2009
16:17:34
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 Subject: Ongoing Misfire Problem
IP: Logged
Message:
2002 Dodge Ram 1500 Van, 3.9 V6, 150k, Fresh valve job, uses no oil. (OK, I know it's not a Dakota, but I used to have one, and it's the exact same powertrain)
Problem: Throws codes: p0300, p0301, p0303, p0305. P0301 pops right away. Misfires at idle and under moderate load, seems almost normal at very light throttle, and under heavy throttle. Does not act like a spark miss. Spark plugs are very light, almost white. I tried replacing the #1 injector, had no effect. Of course I have done all the obvious, plugs, wires, cap, rotor, coil, cam sensor, etc. I'm wondering if I have a fuel pressure issue. I replaced the fuel pump with a lo mile one I had a few thousand miles ago, when I noticed the pressure seemed on the low side (48psi, bouncy needle) I noticed last night that the pressure was only 45psi, so I swapped out the regulator with a spare I had (not new), and got 50psi with a very bouncy needle, from 45-55psi. Is this a defective regulator? Should the fuel pressure be very steady? I tried two different guages, they both show the same. Could this cause the misfiring? Thanks for any help you guys can provide.
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daddio
Dodge Dakota
JOIN HERE
11/09/2009
17:15:16
|  RE: Ongoing Misfire Problem
IP: Logged
Message:
Could be a vacuum leak. How are the intake manifold gaskets? If it's on cylinders 1, 3 & 5 it would lead me to think there is something wrong on that bank. Check for intake manifold gasket leak on that side.
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Van Guy
Dodge Dakota
JOIN HERE
11/09/2009
17:26:30
| RE: Ongoing Misfire Problem
IP: Logged
Message:
No intake leaks. Checked several times. Only three vacuum connections to manifold, all good.
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daddio
Dodge Dakota
JOIN HERE
11/10/2009
11:43:34
| RE: Ongoing Misfire Problem
IP: Logged
Message:
It could be leaking from the intake gasket and not vacuum connections. Did you check the manifold itself where it seals to the head?
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Van Guy
Dodge Dakota
JOIN HERE
11/11/2009
20:57:39
| RE: Ongoing Misfire Problem
IP: Logged
Message:
Checked for leaks a million times, using solvent, propane, etc. I don't think it's a vacuum leak. Doesn't ACT like a vacuum leak.
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