Car stumbling, running rich and backfiring?
Thread Starter
Staging Lane
Joined: Sep 2010
Posts: 74
Likes: 0
From: Lewisville, Texas
Car stumbling, running rich and backfiring? Hey guys I've been trying to search for this all day yesterday with all different answers but it seems I can't find the answer to my solution.
I put pacesetter LTs in (no air fittings) and tsp true duals a few days ago, there's no cats and no rear o2 sensors. Now when I put them in I ripped out all of that air stuff and threw it away. Now my problem is this, when I put the car in gear it stumbles to get going like theres a misfire going on then there's a loud backfire.
What could be causing this problem? I didn't cap off that vacumn seal behind the manifold when I took the air system out Which Im going to do today.. Could it be that? Would it be that I just need a tune? My mechanic said that the only codes that the computer is spitting out is the rear o2 sensors because they're not there, he said since the computer is reading they're not there it's telling the PCM to dump more fuel because it's running lean. He told me to put the rear o2 sensors in and the problem should go away, is that true?
I put pacesetter LTs in (no air fittings) and tsp true duals a few days ago, there's no cats and no rear o2 sensors. Now when I put them in I ripped out all of that air stuff and threw it away. Now my problem is this, when I put the car in gear it stumbles to get going like theres a misfire going on then there's a loud backfire.
What could be causing this problem? I didn't cap off that vacumn seal behind the manifold when I took the air system out Which Im going to do today.. Could it be that? Would it be that I just need a tune? My mechanic said that the only codes that the computer is spitting out is the rear o2 sensors because they're not there, he said since the computer is reading they're not there it's telling the PCM to dump more fuel because it's running lean. He told me to put the rear o2 sensors in and the problem should go away, is that true?
If the car has an SES light on scan it and post up the codes or give me a call. The vacuum leak could be causing an issue with the MAP sensor which will cause the car to add a bunch of fuel. It could also be the O2 sensors are bad or plugged in wrong. Either way, getting the codes read will give us a better idea of what is wrong.
Jon
Jon
Thread Starter
Staging Lane
Joined: Sep 2010
Posts: 74
Likes: 0
From: Lewisville, Texas
Im not sure the exact code # off hand, but my mechanic told me it was the code for the rear o2 sensor(s). I bought new bosch 13111 o2s and they were installed with the headers. Maybe they are not in tight enough as you said, ill check them. Thanks for the reply Jon
I capped off that little vacumn tube on the drivers side of the intake manifold, and it didnt help the problem
Anyone else have this problem in the past?
I capped off that little vacumn tube on the drivers side of the intake manifold, and it didnt help the problem
Anyone else have this problem in the past?
the rear O2s have nothing to do with fuel. what about the spark plugs and wires? did you replace them when you installed the headers? are the wires properly seated on the plugs?
Thread Starter
Staging Lane
Joined: Sep 2010
Posts: 74
Likes: 0
From: Lewisville, Texas
I'll get the codes soon.. And I made sure the wires were on the plugs good today. I didn't change the plugs or wires when I did the install. Would putting the wires in different locations effect anything?
Delgoat are you sure the tune would fix it? My buddy swears that's all it needs
Delgoat are you sure the tune would fix it? My buddy swears that's all it needs
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Thread Starter
Staging Lane
Joined: Sep 2010
Posts: 74
Likes: 0
From: Lewisville, Texas
Late reply but I found the problem, must have cracked a plug when I was getting the header in the passenger side, replaced plugs and wires and she runs like a champ now ,and so far no issues with my Bosch o2s..
Launching!
Joined: Oct 2007
Posts: 289
Likes: 0
It's great that you followed up and posted the solution, possibly somebody with similar problems will find it useful!
