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#1
01-04-2010, 09:06 PM
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P0304 misfire problem
Hi guys, the other day I was driving home from work (2002 Rodeo 3.2L v6)and felt a vibration from the engine and it wanting to die at red lights. I scan the computer and got a p0304 code. I changed out the spark plugs, they were due anyway. Nothing abnormal on them other than old and worn. no help. So I swapped #2 + #4 coil pack and erased the code. This time I got a p0300 muti misfire code. When I swapped them back I got p0304. Do I have a dual failure going on here or am I missing something when I swapped the packs? Until the other day the truck ran smoothly.
Last edited by mobzs; 01-05-2010 at 06:58 AM. Reason: add info 
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#2
01-05-2010, 10:50 AM
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Re: P0304 misfire problem
A mis-fire are also commonly caused by a leaking intake manifold gasket.
If you are the original owner with under 120k it is covered by the warranty.
__________________
-Ryan Isuzu Moderator Car Show Tips Operations manager with a results-driven passion for process improvement FAQ 98-04 Isuzu Rodeo, Rodeo Sport, Amigo, Trooper SOLD - NOV2015 - 2000 Amigo, V6, HT winter, ST summer, 2wd
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#4
01-06-2010, 11:23 AM
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Re: P0304 misfire problem
__________________
-Ryan Isuzu Moderator Car Show Tips Operations manager with a results-driven passion for process improvement FAQ 98-04 Isuzu Rodeo, Rodeo Sport, Amigo, Trooper SOLD - NOV2015 - 2000 Amigo, V6, HT winter, ST summer, 2wd
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#5
01-06-2010, 01:00 PM
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Re: P0304 misfire problem
I have seen a plugged catalytic converter choke half an engine out causing random misfires, and $3.5k on a bad fuel filter causing the same type of symptoms.
Random misfiring: Fuel - Filter, pump, injectors Air - Filter, MAF/IACT sensors, unmetered Air leaks, a dirty throttle body. Exhaust - Plugged or blocked catalytic converter. 1) Clean throttle body. 2) Clean MAF/IACT sensors. 3) New fuel + Air filter. 4) Have a back pressure test done on your cats. A good coolant pressure test, and a smoke test should beable to find unmetered air leaks on the Intake.
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#6
01-07-2010, 07:18 PM
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Re: P0304 misfire problem
I thought about spraying starter fluid around the intake manifold. But then the 4+" of snow started coming down. After a not so quick drive to the dealership and $350 later the verdict is in. An unmetered air leak at the manifold gasket. Thanks guys for your input. As always you did put me on the right track for a fix.
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#7
01-07-2010, 11:14 PM
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Re: P0304 misfire problem
I'm glad you didn't do the starting fluid. Could have had a nice flash fire on your hands.
Good to know you found the problem.
__________________
99 Rodeo LS 3.5L Stroker V-6, 4wd, 31x10.5x15 2 inch Trooper lift, Aisin manual hubs. 03 GMC Envoy XL SLT 4x4 5.3L V8
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#8
01-07-2010, 11:17 PM
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Re: P0304 misfire problem
I thought about making a smoke machine with a shop vac + smoke bomb!
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