jQuery not supported.



sputter and backfire during acceleration

sputter and backfire during acceleration

Postby lorennmeg [OP] » Aug 25 2011, 6:14pm

Hey I'm new here and desperate for answers! I'm in the middle of PCSing with the Air Force to Japan and was getting my truck ready to sell, when it started acting up when I accelerated after right after starting the engine. een
The engine starts and runs fine, when I leave for or from work. But when I accelerate out of the parking lot it hesitates and really sputters. If you try to accelerate more it backfires a few times and then takes off like there's nothing wrong.
There are two codes that are popping, one says that the right bank is running lean and the other says the O2 sensor heater coil is bad. I don't think the O2 sensor has anything to do with it because it's been throwing that code off and on for the last while.
Any help would be appreciated since I leave in about a week and the new owner would like to see the issue resolved! I don't really blame him!
Original Poster
lorennmeg
Newbie
Newbie
Posts: 1
Topics: 1
Joined: Aug 25 2011, 6:06pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Whiteman AFB MO
Year: 2000
Make/Model: Chevrolet Silverado
Extra Info: v 6
Group Membership:
Registered users

Re: sputter and backfire during acceleration

Postby SierraSLX » Sep 04 2011, 3:03am

anytime an engine is popping and backfiring and carrying on its usually out of time or is mis firing
SierraSLX
Newbie
Newbie
Posts: 5
Images: 0
Joined: Sep 04 2011, 2:55am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: OKC
Year: 1992
Make/Model: GMC Sierra
Extra Info: V6 5 speed
Group Membership:
Registered users

Re: sputter and backfire during acceleration

Postby SilverSurfer » Sep 06 2011, 6:01am

A lean code usually indicates an intake manifold leak. It might just have gotten worse.
Image
User avatar
SilverSurfer
Staff Member
Staff Member
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 2422
Topics: 49
Images: 82
Joined: Jun 27 2011, 1:29am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Phoenix, AZ
Year: 2003
Make/Model: Chevrolet Silverado
Extra Info: 5.3L Auto 2wd Posi
Group Membership:
Automotive Technicians
Global moderators
Registered users
Servicemen

Re: sputter and backfire during acceleration

Postby berniematic » Oct 14 2011, 3:08am

Here we go again. acceleration Sputtering and popping was the first indication of trouble with mine (see: Another one not running). I'd be cruising on the highway and step on it and it would cough and sputter and then clear up. Made me think of carbon'ed up plugs and I dismissed it at that. IT progressed to backfiring and popping at in town acceleration then not being able to stay running at all. Replacing the fuel pressure regulator fixed it.

Now - 500 miles later - its running right but I'm getting service engine and the first code is "too lean". So this means theres a leak in the seal of the plastic manifold I had to remove to change the FPR?? Maybe a loose bolt - or something else?

Thanks again!
Last edited by EKinMN on Oct 20 2011, 12:39pm, edited 1 time in total.
Reason: added link to reference
berniematic
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Topics: 2
Joined: Jul 15 2011, 5:01am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Central WI
Year: 2001
Make/Model: Chevrolet Silverado
Extra Info: V6
Group Membership:
Registered users

Re: sputter and backfire during acceleration

Postby SilverSurfer » Oct 14 2011, 3:34am

Leaky intake manifolds aren't uncommon with any make/model/year. It's not a bad idea to double-check your previous work. Is it safe to assume that you cleared the codes after the repair?

The best way I know to find an intake leak is to spray (unlit) propane around the intake with the engine idling. You should hear a slight bump in the rpms until the ecm makes corrections. That will get you into the area where the leak is.
Image
User avatar
SilverSurfer
Staff Member
Staff Member
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 2422
Topics: 49
Images: 82
Joined: Jun 27 2011, 1:29am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Phoenix, AZ
Year: 2003
Make/Model: Chevrolet Silverado
Extra Info: 5.3L Auto 2wd Posi
Group Membership:
Automotive Technicians
Global moderators
Registered users
Servicemen

Re: sputter and backfire during acceleration

Postby berniematic » Oct 14 2011, 4:34am

Thank you - I'll go find some propane. Yeah - I cleared the codes.
berniematic
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Topics: 2
Joined: Jul 15 2011, 5:01am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Central WI
Year: 2001
Make/Model: Chevrolet Silverado
Extra Info: V6
Group Membership:
Registered users

Re: sputter and backfire during acceleration

Postby blwilliamsPCN » Oct 17 2011, 11:12pm

sputtering could also be dirty fuel injectors
blwilliamsPCN
Firing on 2 cylinders [L1]
Firing on 2 cylinders [L1]
Posts: 23
Images: 2
Joined: Oct 15 2011, 1:25am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: oklahoma
Year: 2004
Make/Model: Chevrolet Silverado
Group Membership:
Registered users

Re: sputter and backfire during acceleration

Postby hetzelmr » Nov 04 2011, 9:03pm

I'm just having this problem on my 08 now. Its sputtering, backfiring, misfiring, in the low RPM band(below 2k) hit the gas and it upshifts and clears up. I also noticed its idleing rough. So, leaky-cracked manifold? Fouled plugs? bad dis cap? engine only has 32k miles
[i]08 Sierra, 4.3 bone stock

Once you have experienced flight, you will forever walk the Earth with your eyes turned skyward. For there you have been, and there you long to return.
hetzelmr
Firing on 1 cylinder [L1]
Firing on 1 cylinder [L1]
Posts: 17
Topics: 2
Images: 5
Joined: Oct 21 2011, 6:20am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Iowa
Year: 2008
Make/Model: GMC Sierra
Group Membership:
Registered users

Re: sputter and backfire during acceleration

Postby starspangled6.0 » Nov 04 2011, 9:14pm

My truck did the same thing- it was a dirty throttle body. Not sure if that will fix yours, but it's an idea.
07 Silverado 3500HD 6.6L Crew Cab Dually
04 Silverado 2500HD 6.6L Extended Cab w\Hiniker 8.5 V
03 Sierra 2500HD 6.0L Extended Cab w\BOSS 8.2' V


http://www.integrityoutdoor.biz
User avatar
starspangled6.0
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 6258
Topics: 307
Images: 57
Joined: Nov 08 2010, 9:38pm
Years of membership: 4 years of membership4 years of membership4 years of membership4 years of membership
Location: Minnesota
Year: 2007
Make/Model: Chevrolet Silverado
Extra Info: 3500HD 6.6L Duramax
Group Membership:
Registered users

Re: sputter and backfire during acceleration

Postby SilverSurfer » Nov 05 2011, 3:58am

That reminds me, I think there's a TSB out about throttle bodies. Sometimes just replacing the tb gasket works, but other times the tb is cracked and has to be replaced. I'll look this up and get back to you.
Image
User avatar
SilverSurfer
Staff Member
Staff Member
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 2422
Topics: 49
Images: 82
Joined: Jun 27 2011, 1:29am
Years of membership: 3 years of membership3 years of membership3 years of membership
Location: Phoenix, AZ
Year: 2003
Make/Model: Chevrolet Silverado
Extra Info: 5.3L Auto 2wd Posi
Group Membership:
Automotive Technicians
Global moderators
Registered users
Servicemen

Return to Vortec 4300 4.3L V6

 

  • Similar topics
    Replies
    Views
    Last post

Common search terms

engine think work sputter right backfire during getting acceleration miles problem check mine same thanks back help make first

It is currently Nov 23 2014, 11:51am

  • Sponsor
Login  •  Register
SHOP TALK (Live Chat)
Vortec 4300 4.3L V6 Forum
Vortec 4300 4.3L V6 specific.
To create a new topic in Vortec 4300 4.3L V6, click this button:
Previous topic Next topic
Sitewide News Sitemaps & Feeds

Who is online

Users browsing this forum: No registered users and 1 guest