3 replies to this topic

[bigboi407]

So i figured id post over here since i havent said anything in quite some time, i did something i said i wouldnt do, and thats buy a dodge, i couldnt pass up a 98 dakota 2.5 4 cylinder for $850

 

So i rebuilt the engine, and first i had a P1391 (Cam position sensor) Solved that, fuel sync was off...

 

Then Along came P0304 (Cyl #4 misfire)

 

I have swapped injectors from #3 to #4 no change in result

 

i swapped the wire n plug from #3 to #4 no change in result

 

did a Compression test, read 125psi Three times in a row

 

i sprayed the engine bay with carb cleaner, no change in RPMs

 

I Swapped out distributor/cam position sensor, No change in result

 

i Changed hydraulic lifters on #4 cylinder, theres no valve lash adjustments either

 

Fuel pressure test was at solid 50psi

 

Randomly runs on 3 cylinders, then will run on 4 cylinders for a little bit then go back to 3

 

 

I have yet to do a leak down test on that cylinder (i do not own one) or a fuel pressure test on the fuel rail, im gonna try another distributor cap as well, im talking to another dakota 2.5 owner and a dodge technician and we dont have much else to think of besides these 2 tests i havent done

[PuddleSkipper]

misfires can be caused by vacume leaks, might be time to grab a cigar and a long hose and lite er up. Just make sure the top of the TB is blocked and plug in your long hose somewhere in the manifold and puff, puff, blow.

[bigboi407]

no leaks...

[bigboi407]

#4 misfire was indeed caused by the head, im taking it to the machine shop now to have it checked for cracks

 

 

 

 

 

 

Aaand heres #4 exhaust valve:

 

 

Aaaand i couldnt complete this without a few of my friends on the job (BL is a friends):

 

 

#4 misfire has been defeated and the engine is running absolutely perfect