99 blazer missfire

Asked by Jul 02, 2016 at 03:02 PM about the 1999 Chevrolet Blazer LS 4-Door 4WD

Question type: Maintenance & Repair

New coil ignition control module  plugs wires distributor
maf iat ect throttle body iac tps fuel filter gaskets from
head up. New mfi conversion fuel pressure good
compression test good. P0300 only at idle mostly on #1
with small misfires on 4. 3 will misfire occasionally.
Sometimes 4 will misfire more than 1 and vise versa. Any
ideas. I also can't find any vacuum leaks

5 Answers

29,065

did you check for a bad cam lobe.../ vavle springs/pressures?

32,415

Maybe test the fuel injector circuit? http://www.autodiagnosticsandpublishing.com/feature/fuel-injector-testing.htm

Yes all injectors are getting power. How would I know about cam lobe or valve springs?

If you drive it it runs fine no issues no cel when I clear it. Watching my tech 2 only misfires at low rpms 800 and below and obviously idle.

Check the crank shaft sencer i had the same problem my engine wouldn't turn all the way over come to find out it was a easy fix

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