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

42,405

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 out of 2 people think this is 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

42,405

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

42,405

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

Add photo

Related Questions

Blazer

Looking for a Used Blazer in your area?

CarGurus has 1,374 nationwide Blazer listings starting at $2,000.

ZIP:

Search Chevrolet Blazer Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Chevrolet Blazer Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,840
#2 yetilikesbeer
yetilikesbeer
Reputation 1,110
#3 dandyoun
dandyoun
Reputation 660
View All

Related Models For Sale

Used Chevrolet TrailBlazer
106 Great Deals out of 5,283 listings starting at $900
Used Chevrolet Tahoe
852 Great Deals out of 28,370 listings starting at $1,700
Used Chevrolet S-10
10 Great Deals out of 1,632 listings starting at $1,795
Used Chevrolet Silverado 1500
2,741 Great Deals out of 149,168 listings starting at $1,500
Used GMC Jimmy
294 listings starting at $1,500
Used Ford Explorer
1,207 Great Deals out of 71,148 listings starting at $1,000
Used Jeep Grand Cherokee
1,001 Great Deals out of 65,971 listings starting at $1,500
Used Chevrolet Camaro
475 Great Deals out of 39,923 listings starting at $3,499
Used Ford F-150
3,217 Great Deals out of 205,088 listings starting at $1,779
Used Jeep Cherokee
334 Great Deals out of 52,604 listings starting at $2,200
Used Jeep Wrangler
491 Great Deals out of 17,958 listings starting at $2,950
Used Chevrolet Impala
935 Great Deals out of 35,463 listings starting at $1,995