1996 chrysler voyager 3.8 p0300 random misfire

robstrom · **Joined:** Sun Jul 20, 2008 4:32 pm **Posts:** 5

I have a grand voyager with 257,000 miles, 3.8 engine that has been riding rough. I received a OBD2 code for the O2 sensor so I replaced the sensor. Then I got a P300 for random misfire. I found a vacuum leak and the car runs better but does not accelerate well at all.

My question is, why would the car misfire and lose power on acceleration? It idles fine and can be reved up in park just fine. I can get the van up to speed and it runs ok. It's the acceleration that seems to be related to the problem.

I have changed the plugs and wires. The injectors all have the same clicking sound when I listen to them with the a screwdriver ( did not have the auto stethoscope) . I have not not tried to remove them yet as this job is a bit big.

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jessenorman2008 · **Joined:** Thu Aug 28, 2008 2:15 pm **Posts:** 63

Check your Egr and and the other stuff like a restricted catylic converter also do a compression test fuel pressure test see if you have a valve burned

asecmt · **Posted:** Sat Mar 14, 2009 4:46 pm

you could have a fuel delivery problem, did you check the coil?

jeff compton · **Posted:** Mon Mar 16, 2009 12:13 pm

The po300 is still an active code?

robstrom · **Joined:** Sun Jul 20, 2008 4:32 pm **Posts:** 5

The EGR tested Ok. I can see the valve stem moving at 2000 rpm. I also did the vacuum test listed in the Haynes book and it passed.

I checked the primary and secondary resistance on the coil and it checked out ok. Could the coil still be failing under acceleration?

After replacing the plugs I cleared the P0300 code and it has not returned. I still backfire and hesitate on acceleration. Just not as bad as before.

Also, just recently I while accelerating my console lights all blinked on and off for a moment. As if I was about to lose power.

Not sure what that was but I have not been able to replicate it along with the MIL which has not returned.

asecmt · **Posted:** Mon Mar 23, 2009 4:28 pm

have you check fuel pressure and volume?

1996 chrysler voyager 3.8 p0300 random misfire

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