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-   -   5.2 misfire (

NRMOBILETECH 02-22-2013 10:08 AM

5.2 misfire
ok i have a 99 dodge ram 1500 4wd 5.2 getting misfire code cylinder 8 started with cylinder 7 i put plugs wires cap rotor coil stator and pulled the injectors on cylinders 1,3,5,7 and when i cleaned them and put them bak the misfire code went to cylinder 8 i have done a compression check all good there and i followed the tsb on lug wire routing but still getting misfire on cylinder 8 gettin little frustrated lol any coments??? no plugs are getting coated in oil

RamTech 02-22-2013 10:13 AM

Has the intake plenum pan gasket ever been replaced?

NRMOBILETECH 02-22-2013 10:19 AM

no not yet i was thinkin the same but none of the plugs looked coated just seein if anyone else had same issues resorting in another problem before i tear down the intake

RamTech 02-22-2013 10:53 AM

Checking for a blown plenum pan gasket is going to be the next step since you've already covered the secondary ignition.

NRMOBILETECH 02-22-2013 12:04 PM

also the only thing keepin me away from the intake gaskets is no leak down on compression test

RamTech 02-22-2013 01:18 PM

A compression test will not show you the same things a leak down test will and it won't show you a blown plenum pan gasket. You need to follow this bulliten in order to correctly diagnose a blown plenum pan gasket.

Loganm 02-25-2013 10:44 PM

I'm having the same problem with my pickup except I had the spark plug on my cylinder 8 break apart. I changed out the plug but wasn't able to find the ceramic piece that broke apart. It ran fine for about 500 miles, now my check engine light is back on and the code reads the same cylinder 8 misfire

Screamintrashcan 02-27-2013 07:44 PM

Well, Logan, I had the exploding spark plug problems with my 98, the pieces all went thru the exhaust just fine, (several times) but to cure the #8 detonation, I had to replace the plenum gasket. I couldn't figure out what was causing the #8 misfire, and detonation, with the exploding spark plug prob, for a long time, initially, now any misfire code pretty much tells me that the prob is that flippin gasket.

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