99 blazer missfire

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

26,525

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

25,805

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

Your Answer

Blazer

Looking for a Used Blazer in your area?

CarGurus has 1,160 nationwide Blazer listings starting at $950.

ZIP:

Chevrolet Blazer Experts

  • #1
    Andrew Olsen
    Reputation
    2,030
  • #2
    yetilikesbeer
    Reputation
    1,330
  • #3
    Rowefast
    Reputation
    1,030
View All

Related Models For Sale

Used Chevrolet Tahoe
649 Great Deals out of 36,707 listings starting at $1,800
Used Chevrolet S-10
7 Great Deals out of 1,276 listings starting at $1,800
Used Chevrolet Silverado 1500
2,146 Great Deals out of 183,564 listings starting at $1,898
Used GMC Jimmy
247 listings starting at $1,995
Used Chevrolet Camaro
422 Great Deals out of 31,920 listings starting at $2,395
Used Ford Explorer
813 Great Deals out of 63,292 listings starting at $1,495
Used Jeep Grand Cherokee
937 Great Deals out of 71,552 listings starting at $995
Used Chevrolet C/K 1500
880 listings starting at $3,195
Used Ford F-150
2,228 Great Deals out of 182,698 listings starting at $1,500
Used Jeep Cherokee
415 Great Deals out of 41,180 listings starting at $1,800
Used Jeep Wrangler
280 Great Deals out of 15,908 listings starting at $2,997

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.