multiple random misfires

10

Asked by Jan 30, 2014 at 02:41 PM about the 2001 Chevrolet Express G3500 Passenger Van Extended

Question type: Maintenance & Repair

Ok...Hopefully someone will be able to help. I have been getting p0300 codes coming up on '01 Chevy Express 3500 (5.7 litre) over the last week. It only throws the codes while I'm idling. I have checked and repaired a couple vacuum lines, cleaned the mass air flow sensor, cleaned the throttle body, installed new plugs cap and rotor, ran fuel injector cleaner through the fuel system, checked the for intake manifold leaks, etc., etc,. Today I decided to pull the plug on the maf sensor, all of my misfires dissapeared and my van was running great. Since I figured that was the issue, I bought a new maf sensor and installed it, cleared the maf code and started it up. Not even a minute later, it started throwing p0300 codes again. I unplugged the new one and the misfires vanished. Has anyone had any similar experience? I'm at a loss, and don't want to just throw money at it. Thanks in advance

4 Answers

72,395

Did you replace the spark plug wires when you changed the plugs cap and rotor? If not, that could be causing the misfiring. Always replace the wires when you do a tune up. It's good preventative maintenance. HTH. -Jim

1 of 1 people found this helpful.
10

I did on the last tune up. I still am not getting my head around it running great when I unplug the maf sensor, then starts misfiring right away as soon as it gets plugged back in.

1 of 1 people found this helpful.
20

I dont know, having the same problem with my 2001 jetta, any luck?

2 of 2 people found this helpful.

I'm having the same problem with my bmw 330ci

Your Answer

Express

Looking for a Used Express in your area?

CarGurus has 5,420 nationwide Express listings starting at $3,500.

ZIP:

Chevrolet Express Experts

  • #1
    tenspeed
    Reputation
    300
  • #2
    dizybren
    Reputation
    240
  • #2
    Sarai Sanchez
    Reputation
    240
View All

Related Models For Sale

Used Chevrolet Express Cargo
53 Great Deals out of 11,541 listings starting at $2,500
Used GMC Savana
5 Great Deals out of 1,094 listings starting at $6,000
Used Ford E-Series Wagon
34 Great Deals out of 1,146 listings starting at $2,995
Used Chevrolet Silverado 1500
2,568 Great Deals out of 173,246 listings starting at $955
Used Chevrolet Silverado 2500HD
378 Great Deals out of 30,295 listings starting at $2,995
Used Ford E-Series Cargo
67 Great Deals out of 3,263 listings starting at $2,995
Used GMC Savana Cargo
32 Great Deals out of 3,219 listings starting at $1,999
Used Ford E-350
206 listings starting at $4,995
Used Chevrolet Suburban
472 Great Deals out of 23,913 listings starting at $1,799
Used Ford F-150
3,124 Great Deals out of 218,978 listings starting at $1,200
Used Ford Transit Cargo
105 Great Deals out of 18,318 listings starting at $13,500
Used Chevrolet Astro
204 listings starting at $1,495

Used Cars For Sale

2017 Chevrolet Express For Sale
16 Great Deals out of 2,707 listings starting at $19,888
2016 Chevrolet Express For Sale
27 Great Deals out of 736 listings starting at $16,600
2015 Chevrolet Express For Sale
4 Great Deals out of 222 listings starting at $12,599
2014 Chevrolet Express For Sale
4 Great Deals out of 230 listings starting at $11,999
2013 Chevrolet Express For Sale
147 listings starting at $9,999

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.