Misfire code

Asked by Oct 21, 2016 at 03:05 PM about the 1999 Chevrolet Silverado 1500 3 Dr LS Extended Cab Stepside SB

Question type: Maintenance & Repair

What could keep a brand new spark plug from
firing if wires are good spark plug is new and coil is
new.  1999 Chevy silverado

3 Answers

260

Ok are actually seeing that the plug isn't firing or did you replace the plug and the cylinder is still dead ? .have you checked distributor cap /rotor ? Is it just one spark plug not firing or none firing ? Maybe more information from you would make it easier to help answer your question and get you back on the road ..

60,765

It may be a bad fuel injector on that cylinder. So check that out. If you have spark and fuel on that cylinder, check the compression on that cylinder. You may have a burned valve or worn piston rings. A very low compression reading with tell you that. HTH. -Jim

20

99 is a split year. Do you have a 5.7 vortec motor? Or a 5.3 ls motor?

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