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08-06-2008, 07:45 PM | #1 | |
AF Newbie
Join Date: Aug 2008
Location: I.B.
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99 Jimmy 4.3 running really rough
Sounds like a cylinder (possilby #3) is not firing, changed the plugs, wires, oil & filter, fuel filter, flushed the cooling system. Checked the wires to see if they're sparking and they all are. Put the radio on AM and here a tick tick tick noise and can here it now sometimes when I use satellite radio. Engine light comes on when started up then flashes as I drive, only 150k miles on the motor. Had it put on a scanner by two different mechanics and they came to the same conclusion that it's cylinder #3 that is the problem and it could be a bad valve spring or stuck open exhause valve. Anyone else have this problem with the 99, 4.3, 2 door 4x4 and figure it out or narrowed it down to what it might be? One mechanic kidded that it sounded like a Hemi when it was idling. If it's the valve, is it a major project or costly?
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08-06-2008, 11:43 PM | #2 | |
AF Regular
Join Date: Apr 2008
Location: Yuma, Arizona
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Re: 99 Jimmy 4.3 running really rough
How long has it been since you changed the cap & rotor? That could be the miss. I had that with a 97 Blazer 4.3 4x4. It is recommended to use a good quality cap & rotor. Many like OEM GM parts for this.
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