1998 Chevy Suburban Cylinder 6 Missfire

Gary’s Question:  My 98 Suburban is missing badly. The check engine light came on and had the code for number 6 cylinder misfire. so I changed out the spark plugs and wires, but the miss hasn’t gone away. what should i check next?

Answer: OK, misfires can have all kinds of causes as I’ve mentioned many times. BUT, in your case, the two main biggies are injector problems on # 6, or an intake manifold leak on # 6. SO, have the intake manifold checked for vacuum leaks. Those plastic intake manifolds have real problems with leaking as the manifolds and their gaskets often warp over time. If you can’t check this yourself, have someone smoke leak test the manifold, and if it’s leaking, smoke will come out of the hole where the leak is. Let’s hope it’s that, because injector replacement is REALLY expensive on that engine because they’re hidden deep inside the engine and a lot has to be taken apart. Good Luck.

 

 


  1. 1Gary said on Nov 2nd, 2014 at 6:06 pm

    Michael, thank you. There was a small leak in the intake manifold gasket on the number 6 cylinder. I could hear the engine sucking air from there and didn’t have to replace that expensive fuel injector. thanks a million, I’ve put you on my favorites list. Gary

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