Exhaust leak = Stumbles??

[yeroc40]

So i gave in to the stealership and let them sync the throttle bodies. he was so sure that they were way off and once I got that taken care of the stumbles would be much better and I wouldn't need the updated computer. Well, $120 later and it is just as bad as it was. Exactly as I figured. I just
thought if I gave him the business he would be more likely to get the computer and be done with it.
He actually told me that they were only a little off and I should't expect it to run any different.
Now it stubles so bad because there is an exhaust leak. But I beat him to it I already have the gasket to fix that. But he assured me that after I fix that I should see a big improvement.

Can an exhaust leak really cause this stumbling that is the exact symptoms of the original ecu??

[dragonbro]

doesn't sound right to me. where is the exhaust leak? most likely to cause a backfire, but not a running problem. i could see if it were leaking at the head flange and sucking in air at that point it might make a lean condition and the computer could compensate for that and richen the mixture a bit, but it just doesn't sound like the mechanic is being straight with you.

[horkn]

thats what i say. what does the code on your ecu say? 1f40 or 1f41?

if it is the original, i would have then give you an updated ecu. mine runs pretty damn good, considering it has a full yosh pipe set and no pc2 or remap..... but that will change this winter....

so i see you are from kaukauna... ever run the drags there? want to next summer?

its always nice to meet fellow tl owners in your own state....

[Rupes]

the TL used an open loop system ie no O2 sensor in the exhaust, the ecu has no idea whats going throught the exhaust so I cant see how an exhaust leak would be causing any troubles like that ... more than likely the mech' is just full of it

[dragonbro]

Originally posted by rupes
the TL used an open loop system ie no O2 sensor in the exhaust, the ecu has no idea whats going throught the exhaust so I cant see how an exhaust leak would be causing any troubles like that ... more than likely the mech' is just full of it

good point rupes......i forgot about that.

[yeroc40]

Thanks! That is about what I thought but I will fix that this weekend and take it back to him on monday...