02' 4.8L z71 w/ high milage (but in good running condition) with new coil packs, plugs and fuel pump is misfiring. "random multiple misfires". Need advice on what to do. Injectors?

Asked by jgresham5185 Oct 03, 2013 at 05:35 AM about the 2002 Chevrolet Silverado 1500 LS 4WD

Question type: Maintenance & Repair

How can I diagnose and fix my issue myself? As i am no stranger to wrenching on my
truck... With 180k miles wouldnt be suprised if i need to do some work on my injectors.
Where should I start? Anyone know the ideal voltage I should be reading on my injectors?

3,370

wlogan answered 10 years ago

you didn't mention plug wires. a good injector cleaner like sea foam is good every now and then to keep fuel system clean. make sure connections such as the crank snsor are tight. random misfires can be a real pain to diagnose sometimes.

Mark helpful

Your Answer:

02' 4.8L z71 w/ high milage (but in good running condition) with new coil packs, plugs and fuel pump is misfiring. "random multiple misfires". Need advice on what to do. Injectors? 1 Answer

How can I diagnose and fix my issue myself? As i am no stranger to wrenching on my truck... With 180k miles wouldnt be suprised if i need to do some work on my injectors. Where should I start? Any...

2002 Chevrolet Silverado 1500 LS 4WD

-

Maintenance & Repair
Why is cylinder 5 misfiring on my 5.3 vortec? 2 Answers

I have a 2005 Silverado with a 5.3 vortec. Cylinder 5 is misfiring and I do not know what else it can be. Changed plugs and wires and coil packs. Had it in a shop looking for what else it could be....

2005 Chevrolet Silverado 1500 Z71 4WD

-

Maintenance & Repair
I have a 2008 Chevy Silverado 5.3. Truck idles good when in park but when I put it into gear the check engine light comes on. P0307, witch is Cylinder 7 misfiring. Ive changed all the lifters,coils,injectors and solnoids. Plugs and wires as well. Even turned off the AFM to see if that would help. cleaned the pushrods, made sure they worked. valley cover has been cleaned as well 2 Answers

I have a 2008 Chevy Silverado 5.3. Truck idles good when in park but when I put it into gear the check engine light comes on. P0307, witch is Cylinder 7 misfiring. Ive changed all the lifters,coils,in...

2008 Chevrolet Silverado 1500 Work Truck Extended Cab RWD

-

Maintenance & Repair
No spark to plugs there is power to the coil packs 1 Answer

I had to swap my original 4.8 for another 4.8 swap everything on to the new motor using my coil packs my harness my intake and my sensors and I'm not getting any Spark but I have power to my coil ...

2012 Chevrolet Silverado 1500 LT RWD

-

Maintenance & Repair
Hi i have a 2001 chevy silverado with a 4.8 engine my problem is that i am getting current to the driver side of the injectors but all four injectors on the passenger side are not. what can it be? 5 Answers

Hi i have a 2001 chevy silverado with a 4.8 engine my problem is that i am getting current to the driver side of the injectors but all four injectors on the passenger side are not. what can it be?

2001 Chevrolet Silverado 1500 Extended Cab 4WD

-

Maintenance & Repair

Used GMC Sierra 1500

123 Great Deals out of 8,182 listings starting at $3,000

Used Ford F-150

315 Great Deals out of 13,805 listings starting at $4,500

Used Chevrolet Silverado 2500HD

31 Great Deals out of 1,683 listings starting at $3,000

Used Toyota Tundra

40 Great Deals out of 977 listings starting at $10,698

Used Dodge RAM 1500

89 listings starting at $2,500

Used Toyota Tacoma

44 Great Deals out of 740 listings starting at $9,975

Used Chevrolet Tahoe

12 Great Deals out of 807 listings starting at $9,980

Used GMC Sierra 2500HD

29 Great Deals out of 2,202 listings starting at $3,000

Used Chevrolet Camaro

16 Great Deals out of 467 listings starting at $10,995

Used Ford F-250 Super Duty

30 Great Deals out of 797 listings starting at $2,890

Used Ford Mustang

38 Great Deals out of 1,626 listings starting at $8,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.

02' 4.8L z71 w/ high milage (but in good running condition) with new coil packs, plugs and fuel pump is misfiring. "random multiple misfires". Need advice on what to do. Injectors?

1 Answer

Your Answer:

Shortcuts

Search Chevrolet Silverado 1500 Questions

CarGurus Experts

Find great deals from top-rated dealers

Related Models For Sale

02' 4.8L z71 w/ high milage (but in good running condition) with new coil packs, plugs and fuel pump is misfiring. "random multiple misfires". Need advice on what to do. Injectors?

1 Answer

Your Answer:

Related Questions