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New TB and CAI - Stumbling / Small Backfire - HELP
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<blockquote data-quote="DT_C03RA" data-source="post: 11438810" data-attributes="member: 126401"><p>Okay guys, what about the EGR and O2 sensors? I keep seeing a ton of information saying the to unplug the EGR (he still has all his connected since he's in the smog Nazi capital of the world) and I guess cap it off and run it to see if the stumbling stops. Not sure as I have no experience on EGR stuff.</p><p></p><p>I have also been researching and see a ton of people say after 80k miles you should change the O2's and his is past that, and they appear to be original. So even changing them out at this point seems like the logical thing to do anyhow.</p><p></p><p>The O2's really make a lot of sense to me since the car stumbles in lower RPM's, but at WOT there is no issue. Since the O2's are shut off at WOT because the car goes into Open Loop, and since in normal driving conditions it's in Closed Loop, a bad O2 would could cause this stumbling issue, right?</p><p></p><p>I've know Ninety3Coupe for 25+ years and I'm trying to help him out, but I'm 1300+ miles away and there's not much I can do physically to see or hear what's going on with this thing. </p><p></p><p>He's cleaned the MAF replaced the fuel filter, fuel pump, TPS, checked for all vacuum leaks, plugs, plug wires, timing, distributor, yada yada yada. We're just kind of stuck and the more research I do lately keeps pointing to a bad O2 or the EGR.</p><p></p><p>Plus from what I've been reading it seems that bumping the fuel pressure kind of masks a bad O2 when it's in Closed Loop. Can anyone confirm that?</p><p></p><p>The issue with the bad gas/varnish smell he's been getting seems to be a more intermittent thing and not related to this stumble. He's only had that happen a few times, so we now think the Charcoal Canister and related parts may be the culprit with that (especially since this car was all stock when he got it; well essentially stock compared to most), but we're still looking for opinions on that too.</p><p></p><p>Really appreciate everyone's assistance and thoughts on this. This is his toy and it's no fun playing with a toy that doesn't work right, ya know?</p><p></p><p>Oh yeah, one other thing he's got a MAF out of a Crown Vic to swap in and right now he's running a 73mm C&L MAF with his stock 19lb injectors. We were under the impression he could swap in the Crown Vic MAF with the 19's, but now he's thinking the Crown Vic was meant for 24's (seems he found some conflicting info on this). Anyone got an definitive answer on that too?</p><p></p><p>Sorry for the long post and mountain of questions, just trying to help my Bro out!</p></blockquote><p></p>
[QUOTE="DT_C03RA, post: 11438810, member: 126401"] Okay guys, what about the EGR and O2 sensors? I keep seeing a ton of information saying the to unplug the EGR (he still has all his connected since he's in the smog Nazi capital of the world) and I guess cap it off and run it to see if the stumbling stops. Not sure as I have no experience on EGR stuff. I have also been researching and see a ton of people say after 80k miles you should change the O2's and his is past that, and they appear to be original. So even changing them out at this point seems like the logical thing to do anyhow. The O2's really make a lot of sense to me since the car stumbles in lower RPM's, but at WOT there is no issue. Since the O2's are shut off at WOT because the car goes into Open Loop, and since in normal driving conditions it's in Closed Loop, a bad O2 would could cause this stumbling issue, right? I've know Ninety3Coupe for 25+ years and I'm trying to help him out, but I'm 1300+ miles away and there's not much I can do physically to see or hear what's going on with this thing. He's cleaned the MAF replaced the fuel filter, fuel pump, TPS, checked for all vacuum leaks, plugs, plug wires, timing, distributor, yada yada yada. We're just kind of stuck and the more research I do lately keeps pointing to a bad O2 or the EGR. Plus from what I've been reading it seems that bumping the fuel pressure kind of masks a bad O2 when it's in Closed Loop. Can anyone confirm that? The issue with the bad gas/varnish smell he's been getting seems to be a more intermittent thing and not related to this stumble. He's only had that happen a few times, so we now think the Charcoal Canister and related parts may be the culprit with that (especially since this car was all stock when he got it; well essentially stock compared to most), but we're still looking for opinions on that too. Really appreciate everyone's assistance and thoughts on this. This is his toy and it's no fun playing with a toy that doesn't work right, ya know? Oh yeah, one other thing he's got a MAF out of a Crown Vic to swap in and right now he's running a 73mm C&L MAF with his stock 19lb injectors. We were under the impression he could swap in the Crown Vic MAF with the 19's, but now he's thinking the Crown Vic was meant for 24's (seems he found some conflicting info on this). Anyone got an definitive answer on that too? Sorry for the long post and mountain of questions, just trying to help my Bro out! [/QUOTE]
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