Subject	Installed DP and TP now idle is bad >>>>>>>
Posted by	JULIAN on July 24, 2019 at 9:00 PM
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Message	1996 TT: Installed 3-inch downpipes and testpipes that are 3-inches tapering to 2.5-inches. Also installed new O2 sensors 2 on the downpipes and 2 on the test pipes. The 2-O2 sensors on the testpipes have O2 extensions. Car runs fine with NO CEL codes. However the idle is very rough sometimes dipping down to below 500rpm and shutting down. Took the car for a nice long 70+ mile highway drive with AC on and off and the car runs fine, however the idle still sucks. Anyone have any idea why or what to look for ? Again only thing that has changed is going to new downpipes and test pipes with new O2 sensors and O2 sensors with extensions. I just want to add that also now at highway speeds pressing the clutch in, and the engine go down to idle and will die, whereas this never did this before the install of the DP / TP. Thank you for reading and any info and help.
Follow Ups	Installed DP and TP now idle is bad >>>>>>> - JULIAN 21:00:19 07/24/19 New O2s.... Which brand are they? (n/m) - MixManMash 21:03:36 07/24/19 All 4 O2 sensors are NGK (n/m) - JULIAN 21:42:23 07/24/19 I ran those for a little while. Seemed to work well enough - Polish 13:12:27 07/25/19 I've seen cars not idle properly on Bosch units, but - MixManMash 13:21:46 07/25/19 Yes NGK = NTK - Polish 16:28:20 07/25/19 More to do w. them being fouled than which brand. (n/m) - Bernie (NoVA) 18:55:34 07/25/19 Agreed. I used to play around logging them with Nistune. - ConVerTT 20:07:32 07/25/19 Easy solution. Ditch the narrow bands, go Haltech and - MixManMash 21:22:40 07/25/19 on the list ... - ConVerTT 22:42:56 07/25/19 You have a vacuum leak in the engine bay. (n/m) - Bernie (NoVA) 23:58:30 07/24/19 Hey Bernie >>> - JULIAN 21:53:50 07/25/19 If it was idling fine before and now it isn't - do not mess - Summeronthechain (MN) 09:22:18 07/26/19 check o2 with ECUTalk...... - VinZmax 08:30:52 07/25/19 Thanks VinZMax >>>> - JULIAN 16:55:13 07/25/19 get some carb clean and spray around under hood/intake - Drk93TT 07:01:06 07/26/19 I did this with the hoses that I could see >>>>>>> - JULIAN 19:32:49 07/26/19 did you curse loud enough at it? neighbors should complain (n/m) - LJZTT 15:39:41 07/25/19 When was your last boost leak test done? (n/m) - ConVerTT 10:58:22 07/26/19 About 6 months ago. (n/m) - JULIAN 19:31:36 07/26/19 I'd say do a boost leak test now just to be certain. (n/m) - ConVerTT 00:56:43 07/28/19 What is strange is that after driving >>>>>>> - JULIAN 19:37:49 07/26/19 Did the funky idle happen immediately after you installed - SirpriZ 17:26:44 07/28/19 Might just need to be tuned to handle the changes. - MixManMash 19:31:00 07/28/19 Yes the funky idle problem occurred >>>>>>> - JULIAN 19:53:40 07/28/19 If the transmission was out or the motor was able to tilt - Bernie (NoVA) 21:45:32 07/28/19
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