Asked by Jan 31, 2016 at 04:56 AM about the 1999 Chevrolet Blazer LS 4-Door 4WD

Question type: Maintenance & Repair

I did a code scan on my 99 blazer and each
time I do i clear them abd when the check
engine liye come on it gives me a misfire in
the next cylinder. I've changed plugs wires
cap rotar ignition pickup crank shaft
position sensor throttle position sensor  pic
sensor.. what could be the problem? Also I
got a evap low signal code

3 Answers


Whats the code that's showing up???? Did you research the code you have and make the repair. Clearing the codes won't do anything and eill keep coming back until the repair is done..

3 of 3 people found this helpful.

Misfire code would be po301 to po308 indicating the cylinder giving the code....Possible causes for a po305 code;> - Faulty spark plug 5 - Clogged or faulty fuel injector 5 - Faulty ignition coil 5 - Fuel injector 5 harness is open or shorted - Fuel injector 5 circuit poor electrical connection - Ignition coil 5 harness is open or shorted - Ignition coil 5 circuit poor electrical connection - Insufficient cylinder 5 compression - Incorrect fuel pressure - Intake air leak............................................................... The EVAP code I would need to know what it was...

2 of 2 people found this helpful.

The spider fuel injector assembly are prone to failure and will cause misfiring and gasoline fouled spark plugs. If it's a fuel injector problem replace the entire spider assembly, if equipped, with the newer designed assembly. Don't replace individual injectors on this. HTH. -Jim

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