2001 Blazer rough idle, Cylinder 2 misfire.

Asked by Jan 23, 2016 at 08:02 PM about the 2001 Chevrolet Blazer 2 Door LS 4WD

Question type: Maintenance & Repair

Okay so I went to start my blazer the other day and
it idled really rough so I hooked a reader up to it and
it was saying a misfire in cylinder 2. So I changed
wires, plugs, cap and rotor and it still hasn't
changed? I have no idea what it could be. I'm
hoping it's not the spider harness.

5 Answers

73,795

This would be a po302 code: Possible causes cylinder #2 misfire>.. - Faulty spark plug 2 - Clogged or faulty fuel injector 2 - Faulty ignition coil 2 - Fuel injector 2 harness is open or shorted - Fuel injector 2 circuit poor electrical connection - Ignition coil 2 harness is open or shorted - Ignition coil 2 circuit poor electrical connection - Insufficient cylinder 2 compression - Incorrect fuel pressure - Intake air leak Tech notes The P0302 code means that the cylinder 2 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 2. If the problem persist more tests needs to be done to diagnose problem

2 of 2 people found this helpful.

The check engine light comes on and flashes when I go over 30 mph but when I slow back down under 30mph it goes off. Is this caused by the same cylinder misfire code

73,795

Well you picked up a miss fire code on #2, I would check compression. It is possible the light would go on / off, but when the check engine light comes on, it set a code in the memory of the computer. So check compression.

I'm waiting to get a computer tester. I checked for vacuum leaks by spraying ether around all vacuum lines and intake and the rpms didn't change. So would it be some kind of sensor or injector harness? I'm out of ideas

73,795

What size engine? If it is the 5.3L may be the coil for that cylinder or a leaky injector. Verify compression tho.

Your Answer

Blazer

Looking for a Used Blazer in your area?

CarGurus has 1,056 nationwide Blazer listings starting at $950.

ZIP:

Chevrolet Blazer Experts

  • #1
    Andrew Olsen
    Reputation
    2,030
  • #2
    yetilikesbeer
    Reputation
    1,350
  • #3
    Rowefast
    Reputation
    1,030
View All

Related Models For Sale

Used Chevrolet Tahoe
653 Great Deals out of 39,640 listings starting at $1,000
Used Chevrolet TrailBlazer
83 Great Deals out of 4,547 listings starting at $1,475
Used Chevrolet S-10
4 Great Deals out of 1,208 listings starting at $2,500
Used GMC Jimmy
237 listings starting at $1,300
Used Chevrolet Silverado 1500
2,109 Great Deals out of 167,058 listings starting at $1,900
Used Jeep Grand Cherokee
907 Great Deals out of 70,962 listings starting at $950
Used Chevrolet Suburban
350 Great Deals out of 21,943 listings starting at $1,999
Used Chevrolet Camaro
416 Great Deals out of 30,918 listings starting at $3,550
Used Ford Explorer
854 Great Deals out of 64,022 listings starting at $1,000
Used Jeep Wrangler
312 Great Deals out of 16,299 listings starting at $2,500
Used Ford F-150
2,317 Great Deals out of 184,576 listings starting at $699
Used Jeep Cherokee
380 Great Deals out of 47,896 listings starting at $2,795

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.