[1BADM3]

Codes pulled

2C2E Lambda probe in front of catalytic converter 2, thrust control
2C7E Lambda probe behind catalytic converter, trimming control
2C6B Lambda probe behind catalytic converter, system check<
29CC Misfirings, several cylinders
2C3A Lambda probe in front of catalytic converter 2, dynamics
0000 Unknown Fault
0000 Unknown Fault

My car has started acting up slowly. Started with stutter at lower RPMS when i was driving and seemed like throttle closer now when the car is cold i get a terrible start up. Doing driving while its cold and some times warm it will stutter at lower rpms. Anyone have any ideas?

I replaced all spark plugs and coils yesterday and still the same thing.

[limitdown]

Did you recently replace or install new downpipes?
Oxygen sensors (lambda sensors) are quite easily damaged during downpipe installation. My Indy accidentally damaged one of my front sensors during DP installation. My car idled and ran like crap. It felt like I had a flat tire when rolling in a parking lot.

Bad sensors will give incorrect/inaccurate AFR numbers, causing all kinds of issues.

Another cause could be leaky fuel injectors, but I would replace the cheaper oxygen sensors first.

[Figure807]

I second the O2 sensors. However, before you go and replace those, try resetting all adaptations first. If you don't have a tune or a BT cable, just disconnect the battery for a few hours, reconnect and see what happens.

[bpdef29]

Originally Posted by Figure807

I second the O2 sensors. However, before you go and replace those, try resetting all adaptations first. If you don't have a tune or a BT cable, just disconnect the battery for a few hours, reconnect and see what happens.

This. I was getting similar codes and misfires after DP install and resetting adaptations did wonders for the lambda codes. Misfires were 2 bad coils that have since been replaced and now it runs great again

[boostaholic786]

Sadly im having the EXACT same issue on the 93 pump flash with about 30% E85 in mostly every tank I get. Anything more and I get fuel codes and until I figure out which turbo kit im going to by myself for christmas I'm going to wait to do the fuel system or atleast the port injection part. might do the fuel-it stage 2 kit but first have to figure out what is going on with my car. At low rpm in a high gear I'm getting the exact same thing as soon as I try and put 10% load on the throttle....Now if I get it up in the 3500rpm range, its a 50% chance it will start stuttering and feels like the car is cutting out and usually I will back off just because I dont want to throw a misfire when I know there is something not right...The first one I'm getting is the Lambda Probe behind catalytic converter 2, trimm control. Now im getting a Lambda Probe infront of catalytic converter 2, system check and of course a misfire on cylinder 5 for some odd reason...recently replaced my valve cover gasket and as soon as we finished it, the car ran like a bat out of hell for about 10 min. then all of a sudden I started getting these weird light throttle shaking and jerking back and forth and I get out of it. I was intermittenly getting the lambda probe behind catalytic converter 2, trimm control but no its constant. All my settings on my JB4 are correct and I'm goign to go ahead and try changing those out to see if it fixes it...If it doesnt, then my next "guess" would be the HPFP taking a shit.... Can 02 sensors do this if you are completely catless? meaning make THAT big of an issue at very light throttle in a high gear more often than being at a higher rpm.. I dont want to push it until its fixed just incase of damaging something else.

Also, since tomorrow is Sunday, the only 02 sensors I found were Bosch from Autozone or atleast till the stealership opens on Monday...Also there is a HUGE price difference so wondering if the Bosch 02 sensors will work ok? Or do I need to get them from the stealership? thanks in advance! I have been trying to get this figured out because IT SUCKS!

[j1gilles]

This is obviously an injector issue...

[1BADM3]

I will try to reset adaptions and see what happens today.

[j1gilles]

Originally Posted by WEBY

I will try to reset adaptions and see what happens today.

You should be pulling your plugs to see if they are fuel/carbon fouled.

[1BADM3]

Originally Posted by j1gilles

You should be pulling your plugs to see if they are fuel/carbon fouled.

I just replaced the plugs as started in first post.

[TrollToll]

Originally Posted by WEBY

I just replaced the plugs as started in first post.

...which is why you should pull them to see if they are fouled from fuel (due to a leaking injector)

[Lshaw]

Does it happen only on cold starts? If so...injectors for sure.

[1BADM3]

I am going to record exactly what it is doing. I doubt it is a fuel injectors i replaced my OEM sparks 2 days ago and all 6 looked normal.

[Lshaw]

Originally Posted by WEBY

I am going to record exactly what it is doing. I doubt it is a fuel injectors i replaced my OEM sparks 2 days ago and all 6 looked normal.

So did replacing the spark plugs solve the issue? Have they ever been replaced? If you search around, this issue is pretty common.

*edit- saw you said you changed spark plugs and coils, def sounds like injectors.

I mean you can replace sensors as what not, but with those codes and misfires....injectors.

[j1gilles]

Originally Posted by WEBY

I just replaced the plugs as started in first post.

Your symptoms sound fuel related to me... Either too much (injector) or not enough (pump) I did read you first post just so you know

[1BADM3]

Originally Posted by j1gilles

Your symptoms sound fuel related to me... Either too much (injector) or not enough (pump) I did read you first post just so you know

I hope not i am resetting settings today. I tried to record what the car is doing and of course once i bring a camera out the car wants to runs 100% normal ...

[Shoooter_j]

I had the codes for the rear o2 sensors when my Indy mixed up the location of the sensors between downpipes. Started stuttering/hesitating at low RPM. After I confirmed the proper dp location for the sensors via wire color, issue was resolved.

[boostaholic786]

Originally Posted by Shoooter_j

I had the codes for the rear o2 sensors when my Indy mixed up the location of the sensors between downpipes. Started stuttering/hesitating at low RPM. After I confirmed the proper dp location for the sensors via wire color, issue was resolved.

Now this seems like it makes more sense....I pulled my car out of my indy shop that does acceptional work for pennies on the dollar compared to any of the big dealerships. Had the valve cover gasket replaced and thought I was taking care of my last issue...NOPE haha!! and WEBY, FYI, I replaced my plugs about a week ago and just pulled out cylinder 5 and it was covered in fuel ect...So I was just fed up with dealing with stupid issues and trying to figure out what coil/injector/plug to replace so I just replaced all six injectors with index 12 ones and bought new coil packs as well as new plugs (again). Tried cleaning them off with brake cleaner but hell, if I spent that much money I can go ahead and buy 6 more plugs. coded injectors to the car today but still havent got on it yet to see if my issues are solved. Still need to replace that lambda probe behind and infront cat converter 2 but then ALL SHOULD BE GOOD......unless its the HPFP....damnit

[limitdown]

Originally Posted by boostaholic786

...I found were Bosch from Autozone or atleast till the stealership opens on Monday...Also there is a HUGE price difference so wondering if the Bosch 02 sensors will work ok?

I replaced both of my front O2 sensors with Bosch-branded ones. They've been running great for about 5k miles.

[1BADM3]

Weirdo so i reset all adaptions still the same thing..
But what i noticed is that the car will only act up when its "cold" basically not fully warmed up. I have to drive the car or let it idle for at least 10 mins before it fixes itself i guess. Weird.

[Milan]

It's injectors! I don't know why all the people on here are trying to tell you otherwise. It's injectors plain and simple

[1BADM3]

Originally Posted by Milan

It's injectors! I don't know why all the people on here are trying to tell you otherwise. It's injectors plain and simple

Thanks will try to find some injectors now.