multiple random misfires

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

64,965

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

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.

20

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

2 out of 2 people think this is helpful.

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

Your Answer

Add photo

Related Questions

Express

Looking for a Used Express in your area?

CarGurus has 5,506 nationwide Express listings starting at $1,200.

ZIP:

Search Chevrolet Express Questions

Chevrolet Express Experts

#1 tenspeed
tenspeed
Reputation 260
#2 dizybren
dizybren
Reputation 200
#2 Sarai Sanchez
Sarai Sanchez
Reputation 200
View All

Related Models For Sale

Used Chevrolet Express Cargo
58 Great Deals out of 13,539 listings starting at $2,895
Used GMC Savana
6 Great Deals out of 1,513 listings starting at $1,895
Used Ford E-Series Wagon
35 Great Deals out of 1,520 listings starting at $1,500
Used Ford E-Series Cargo
88 Great Deals out of 3,062 listings starting at $1,495
Used GMC Savana Cargo
19 Great Deals out of 4,620 listings starting at $2,295
Used Ford E-350
221 listings starting at $3,500
Used Chevrolet Silverado 2500HD
316 Great Deals out of 26,842 listings starting at $1,250
Used Chevrolet Silverado 1500
1,741 Great Deals out of 167,410 listings starting at $1,800
Used Chevrolet Suburban
344 Great Deals out of 18,832 listings starting at $2,295
Used Ford E-150
144 listings starting at $3,650
Used Chevrolet Astro
230 listings starting at $1,500

Used Cars For Sale

2017 Chevrolet Express For Sale
2,207 listings starting at $24,060
2016 Chevrolet Express For Sale
4 Great Deals out of 1,335 listings starting at $19,999
2015 Chevrolet Express For Sale
395 listings starting at $15,498
2014 Chevrolet Express For Sale
6 Great Deals out of 338 listings starting at $10,977
2013 Chevrolet Express For Sale
10 Great Deals out of 159 listings starting at $9,999