Problems with car after exaust

fordblue5oh · 03-06-2005, 02:23 PM

Well guys I have a 2002 GT 5sp with 12xxx miles on it and i picked up half an american thunder 40 series catback system(minus tails)for $50 and i just installed it yesterday. Well it sounds pretty good even with the cats but now at idle i notice misfires just like soft "pop glug glug pop pop" this dosent seem normal to me and also now when i push in the clutch sometimes the idle drops down to like 350rpm and sounds like it is going to die. Anybody else ever hear of this? My car is still under warranty for like 3 more months and it would be nice to have some idea of what it might be before i take it in and they try to tell me "its normal" or change some part that has nothing to do with it and say its fixed(my ford dealer sucks its wham bam thank you mam now leave so we can run another 200 cars through today). Any ideas would be apprecated.

Orange97GTVert · 03-06-2005, 10:23 PM

My son's 98 GT did something like that when he made some exhaust changes, but after a few days it straightened out. It has to have something to do with the computer and the increased flow of the new mufflers. Keep driving, it could be worth a try before you take it to Ford and they try to change a bunch of stuff you don't need.

fordblue5oh · 03-08-2005, 02:48 AM

That would be cool if it just went away. do you think i should "clear" the ecu (dissconnect the batt cable for 10mins)?

Jeff Chambers · 03-08-2005, 06:52 AM

Are you sure that you didn't damage an O2 sensor when changing the exhaust? Are there any codes being reported by the PCM? Clearing the computer and giving it time to re-learn wouldn't be a bad idea.

fordblue5oh · 03-09-2005, 12:36 AM

Im pretty sure i didnt b/c i left the stock H-pipe on its just pipes about 20" long with flowmasters on them and turn downs no tails.But im going to try clearing the ecu tomorrow. I will post back with the results. Also how long will it take to be satisfied the ecu has relearned?

Duane'97gt2v · 03-09-2005, 09:10 AM

Mine was taking forever it seemed until I opened the door and let the light inside come on for a minute then fade off. It was storing power some how. Just a few minutes should be enough.

03-06-2005, 02:23 PM	#1
fordblue5oh Registered Member Join Date: Sep 2003 Location: indiana Posts: 22	Problems with car after exaust Well guys I have a 2002 GT 5sp with 12xxx miles on it and i picked up half an american thunder 40 series catback system(minus tails)for $50 and i just installed it yesterday. Well it sounds pretty good even with the cats but now at idle i notice misfires just like soft "pop glug glug pop pop" this dosent seem normal to me and also now when i push in the clutch sometimes the idle drops down to like 350rpm and sounds like it is going to die. Anybody else ever hear of this? My car is still under warranty for like 3 more months and it would be nice to have some idea of what it might be before i take it in and they try to tell me "its normal" or change some part that has nothing to do with it and say its fixed(my ford dealer sucks its wham bam thank you mam now leave so we can run another 200 cars through today). Any ideas would be apprecated. __________________ IMPORTS SUCK!

03-06-2005, 10:23 PM	#2
Orange97GTVert Mustang Fanatic Join Date: Dec 2003 Location: Tyler, TX Posts: 568	Re: Problems with car after exaust My son's 98 GT did something like that when he made some exhaust changes, but after a few days it straightened out. It has to have something to do with the computer and the increased flow of the new mufflers. Keep driving, it could be worth a try before you take it to Ford and they try to change a bunch of stuff you don't need. __________________ Harold Phillips www.mustangsofeasttexas.org 1997 Mustang GT Convertible, 4.6L Auto, Autumn Orange w/Saddle Tan Top & Leather Interior, Styling Bar, 17 X 9 Polished Cobra R's on Nitto NT 555's, Ford Racing Bullitt Suspension package, Mac CAI, Steeda UDP's, Flowmaster 40 Series Catback, SCT X-Calibrator II, Zaino Shine, 7 time Show Winner, driven daily

03-08-2005, 02:48 AM	#3
fordblue5oh Registered Member Join Date: Sep 2003 Location: indiana Posts: 22	Re: Problems with car after exaust That would be cool if it just went away. do you think i should "clear" the ecu (dissconnect the batt cable for 10mins)? __________________ IMPORTS SUCK!

03-08-2005, 06:52 AM	#4
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: Problems with car after exaust Are you sure that you didn't damage an O2 sensor when changing the exhaust? Are there any codes being reported by the PCM? Clearing the computer and giving it time to re-learn wouldn't be a bad idea. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

03-09-2005, 12:36 AM	#5
fordblue5oh Registered Member Join Date: Sep 2003 Location: indiana Posts: 22	Re: Problems with car after exaust Im pretty sure i didnt b/c i left the stock H-pipe on its just pipes about 20" long with flowmasters on them and turn downs no tails.But im going to try clearing the ecu tomorrow. I will post back with the results. Also how long will it take to be satisfied the ecu has relearned? __________________ IMPORTS SUCK!

03-09-2005, 09:10 AM	#6
Duane'97gt2v Registered Member Join Date: Feb 2005 Posts: 20	Re: Problems with car after exaust Mine was taking forever it seemed until I opened the door and let the light inside come on for a minute then fade off. It was storing power some how. Just a few minutes should be enough.

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