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New TB and CAI - Stumbling / Small Backfire - HELP
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<blockquote data-quote="Ninety3Coupe" data-source="post: 11439388" data-attributes="member: 127711"><p>Well, I was going to begin swapping parts one at a time but folks began pointing towards fuel pressure regulator and a fuel pump so I did that. The TB and CAI is when the stumbling issues arose, the bad gas / varnish smell happened when I replaced the H pipe to a catted one. I have since removed the aftermarket piece (and sold it - P.O.S. rattled) and now have the stock one back on. That means a couple times the stock O2 sensors have been pulled and replaced in the past month. Contamination or damage by the mechanic? Maybe...</p><p></p><p>A lot of my friends (non-Fox fans) ask me why I haven't upped the injectors. Everything I have read says that you need to match the MAF to the injectors. I have a 70mm MAF and sensor off eBay here on my desk that I wanted to install but got conflicting info saying I would need 24# injectors to run it. And furthermore, the online calculators show I am still within the HP levels of a 19# injector. I would LOVE to be wrong and replace them. Thoughts anyone?</p><p></p><p>James - Your reply to the thread came, and I am not kidding, 2 minutes after I hit Buy It Now on eBay for 2 new O2 sensors. They say they last for 60K-ish so it couldn't hurt I guess. The smell began (as best as I can recall) after the initial swapping of the pipe.</p><p></p><p>I'm going for another drive in a bit, but earlier it did not hesitate with the bumped FP. It did start to have that bad gas / varnish smell however as soon as the engine got hot. That is what is really bugging me, and O2 sensors seem to be a culprit that causes all these issues, no?</p><p></p><p>Thanks again James and all others for any and all input and comments!</p></blockquote><p></p>
[QUOTE="Ninety3Coupe, post: 11439388, member: 127711"] Well, I was going to begin swapping parts one at a time but folks began pointing towards fuel pressure regulator and a fuel pump so I did that. The TB and CAI is when the stumbling issues arose, the bad gas / varnish smell happened when I replaced the H pipe to a catted one. I have since removed the aftermarket piece (and sold it - P.O.S. rattled) and now have the stock one back on. That means a couple times the stock O2 sensors have been pulled and replaced in the past month. Contamination or damage by the mechanic? Maybe... A lot of my friends (non-Fox fans) ask me why I haven't upped the injectors. Everything I have read says that you need to match the MAF to the injectors. I have a 70mm MAF and sensor off eBay here on my desk that I wanted to install but got conflicting info saying I would need 24# injectors to run it. And furthermore, the online calculators show I am still within the HP levels of a 19# injector. I would LOVE to be wrong and replace them. Thoughts anyone? James - Your reply to the thread came, and I am not kidding, 2 minutes after I hit Buy It Now on eBay for 2 new O2 sensors. They say they last for 60K-ish so it couldn't hurt I guess. The smell began (as best as I can recall) after the initial swapping of the pipe. I'm going for another drive in a bit, but earlier it did not hesitate with the bumped FP. It did start to have that bad gas / varnish smell however as soon as the engine got hot. That is what is really bugging me, and O2 sensors seem to be a culprit that causes all these issues, no? Thanks again James and all others for any and all input and comments! [/QUOTE]
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