Help in diagnosis code is P0302

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R M - 24 Mar 2005 09:32 GMT

Reader shows "Cylinder 2 misfire detected". I have changed: Spark plug,
wires, cap, rotor, Injector and ran professional injection cleaner at the
rail. I am still getting the code back after clearing it out. Could the rail
be faulty? What the hell else could it be?

1999 ram 1500 4x4, auto, 5.9 gas with 65000 miles.

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Peter - 24 Mar 2005 11:28 GMT

> Reader shows "Cylinder 2 misfire detected". I have changed: Spark
> plug, wires, cap, rotor, Injector and ran professional injection
> cleaner at the rail. I am still getting the code back after clearing
> it out. Could the rail be faulty? What the hell else could it be?
>
> 1999 ram 1500 4x4, auto, 5.9 gas with 65000 miles.

Vacuum leak near cylinder 2. Spray some flammable gas around cyl 2 intake
manifold and note if idle speed increases. If it does, replace intake
manifold gasket.

Peter

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MoParMaN - 24 Mar 2005 12:40 GMT

>> Reader shows "Cylinder 2 misfire detected". I have changed: Spark
>> plug, wires, cap, rotor, Injector and ran professional injection
[quoted text clipped - 8 lines]
>
> Peter

Isn't that how the explosion happened in Houston?

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R M - 25 Mar 2005 07:24 GMT

Will try this weekend. Thanks.

> > Reader shows "Cylinder 2 misfire detected". I have changed: Spark
> > plug, wires, cap, rotor, Injector and ran professional injection
[quoted text clipped - 8 lines]
>
> Peter

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R M - 28 Mar 2005 07:29 GMT

Sprayed around intake with starting fluid (carefully) and no change in
engine speed. MIL Light went out day later but code is still in system with
reader. Does it stay there as historical info or something?

> Will try this weekend. Thanks.
>
[quoted text clipped - 10 lines]
> >
> > Peter

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Peter - 28 Mar 2005 16:48 GMT

> Sprayed around intake with starting fluid (carefully) and no change in
> engine speed. MIL Light went out day later but code is still in
> system with reader. Does it stay there as historical info or
> something?

Usually these codes stay in for 40 ignition cycles or so.

Actually, if you have real misfire it should cause slight engine vibration.
It was fairly noticeable on my V6 (Isuzu Trooper), could be less on V8.
Spraying some starting fluid should decrease the vibration as the misfire
goes away.

Peter

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