Adjusting rev down/idle issues

StealthyWeasel · 06-13-2008, 03:07 PM

My car has a bunch of issues.

1) It lopes in idle- done it ever since I got it tuned last year. Sounds like it's cammed.
2) Revs hang sometimes and sometimes they drop REAL fast. Sometimes they'll hang at 1200 until I come to a complete stop, and THEN they go down. A complete stop always brings them down to a normal idle. This has happened ever since I installed a new 65mm TB (done correctly). The only difference is it has no hole in the throttle plate and has a bleeder control on the side of it.
3) Afterfires as loud as a gunshot if I accelerate hard (to around 5600rpm) and press in the clutch or shift. Doesn't do it every time, but frequently does.
4) Throws a P1131 rich code sometimes. The check engine light comes on, goes off, comes on, repeat.

Maybe I need to adjust mixture, and maybe I need to change the "transition from closed to open loop" from 2 seconds to <1 second. I saw BlackCoog mentioning that, seems like it could be relevant. Would the DPFE have anything to do with it? I have no idea what it does.

StealthyWeasel · 06-13-2008, 03:08 PM

I get about 240 miles a tank driving sanely, that sucks too. Makes me wonder about where all the gas is going..

wadespencer99 · 06-13-2008, 03:22 PM

I just replaced the EGR Vacuum Canister on the back of the UIM and it seems to have fixed my race car idle. Try that.

StealthyWeasel · 06-13-2008, 03:51 PM

EDIT: "The vacuum canister sits on the UIM just above the DPFE sensor" (I didn't know what/where it was

)

Thanks FastCougar, search button FTW.

That i'm going to try.

SingleShot · 06-14-2008, 07:18 AM

1,2, and 4 sounds like my car. except I got bank 1 and 2 Lean on the DTC. Any suggestions? I recently did the "Throttle Hang" how to fix where you get the copper cap and drill it. Worked wonders. But I still have a cammed sound (which I like Lol) and some slight throttle hang at 1200.

Wonder if changing the vacuum canister would do anything. Maybe worth a shot.

SingleShot · 06-14-2008, 07:18 AM

1,2, and 4 sounds like my car. except I got bank 1 and 2 Lean on the DTC. Any suggestions? I recently did the "Throttle Hang" how to fix where you get the copper cap and drill it. Worked wonders. But I still have a cammed sound (which I like Lol) and some slight throttle hang at 1200.

Wonder if changing the vacuum canister would do anything. Maybe worth a shot.

mond12345 · 06-15-2008, 03:15 PM

I really think #1 is in the tune some how Josh. Mine car started doing that right after my tune also and we went to the same place....

fordrule · 06-15-2008, 07:18 PM

how much was the canister and DPFE. i think i have the same problems with mine. but then again i haven't driven mine in almost 2.5 yrs

try a datalog with ur wideband hooked up and see what it looks like....

wadespencer99 · 06-15-2008, 08:37 PM

Nevermind...canister didn't help at all.

ironworker · 06-15-2008, 08:53 PM

If You Have One Of Those Mity-vac Vacuum Pumps Take The Vacuum Line Off Your Egr Valve While The Car Is Idleing And Hook Up The Pump, And Pump It A Couple Times, If The Idle Doesnt Change The Egr Valve Is Stuck Open And You Need A New One...

06-13-2008, 03:07 PM	#1 (permalink)
StealthyWeasel NECO Member Join Date: Sep 2005 Posts: 4,123 Images: 5	Adjusting rev down/idle issues My car has a bunch of issues. 1) It lopes in idle- done it ever since I got it tuned last year. Sounds like it's cammed. 2) Revs hang sometimes and sometimes they drop REAL fast. Sometimes they'll hang at 1200 until I come to a complete stop, and THEN they go down. A complete stop always brings them down to a normal idle. This has happened ever since I installed a new 65mm TB (done correctly). The only difference is it has no hole in the throttle plate and has a bleeder control on the side of it. 3) Afterfires as loud as a gunshot if I accelerate hard (to around 5600rpm) and press in the clutch or shift. Doesn't do it every time, but frequently does. 4) Throws a P1131 rich code sometimes. The check engine light comes on, goes off, comes on, repeat. Maybe I need to adjust mixture, and maybe I need to change the "transition from closed to open loop" from 2 seconds to <1 second. I saw BlackCoog mentioning that, seems like it could be relevant. Would the DPFE have anything to do with it? I have no idea what it does. __________________ Currently: 215whp/194wtq runs 14.4@97 The new plan: 04/05 3L, Wrapped WR Headers, WR Y Pipe-->2.5"ss QTP electric dump valve in place of cat, SVT Cams, SS3/Fidanza, 24# Injectors, Dyno Tune, Quaife LSD + B1 Gearset

06-13-2008, 03:08 PM	#2 (permalink)
StealthyWeasel NECO Member Join Date: Sep 2005 Posts: 4,123 Images: 5	Re: Adjusting rev down/idle issues I get about 240 miles a tank driving sanely, that sucks too. Makes me wonder about where all the gas is going.. __________________ Currently: 215whp/194wtq runs 14.4@97 The new plan: 04/05 3L, Wrapped WR Headers, WR Y Pipe-->2.5"ss QTP electric dump valve in place of cat, SVT Cams, SS3/Fidanza, 24# Injectors, Dyno Tune, Quaife LSD + B1 Gearset

06-13-2008, 03:51 PM	#4 (permalink)
StealthyWeasel NECO Member Join Date: Sep 2005 Posts: 4,123 Images: 5	Re: Adjusting rev down/idle issues EDIT: "The vacuum canister sits on the UIM just above the DPFE sensor" (I didn't know what/where it was ) Thanks FastCougar, search button FTW. That i'm going to try. __________________ Currently: 215whp/194wtq runs 14.4@97 The new plan: 04/05 3L, Wrapped WR Headers, WR Y Pipe-->2.5"ss QTP electric dump valve in place of cat, SVT Cams, SS3/Fidanza, 24# Injectors, Dyno Tune, Quaife LSD + B1 Gearset

06-14-2008, 07:18 AM	#5 (permalink)
SingleShot NECO Member Join Date: Jan 2007 Location: K-Town, GA Posts: 319	Re: Adjusting rev down/idle issues 1,2, and 4 sounds like my car. except I got bank 1 and 2 Lean on the DTC. Any suggestions? I recently did the "Throttle Hang" how to fix where you get the copper cap and drill it. Worked wonders. But I still have a cammed sound (which I like Lol) and some slight throttle hang at 1200. Wonder if changing the vacuum canister would do anything. Maybe worth a shot. __________________ MySpace <---- Add me

06-14-2008, 07:18 AM	#6 (permalink)
SingleShot NECO Member Join Date: Jan 2007 Location: K-Town, GA Posts: 319	Re: Adjusting rev down/idle issues 1,2, and 4 sounds like my car. except I got bank 1 and 2 Lean on the DTC. Any suggestions? I recently did the "Throttle Hang" how to fix where you get the copper cap and drill it. Worked wonders. But I still have a cammed sound (which I like Lol) and some slight throttle hang at 1200. Wonder if changing the vacuum canister would do anything. Maybe worth a shot. __________________ MySpace <---- Add me

06-15-2008, 03:15 PM	#7 (permalink)
mond12345 NECO Member Join Date: Nov 2004 Location: PA Posts: 3,122 Images: 14	Re: Adjusting rev down/idle issues I really think #1 is in the tune some how Josh. Mine car started doing that right after my tune also and we went to the same place.... __________________ 99 3.0L MTX Silver Frost - CougarDB Heavily Modded 07 Subaru STi Blue/Gold Rims - COBB Stage 1 07 Honda CBR600RR Blue/Silver - Modded also...

06-15-2008, 07:18 PM	#8 (permalink)
fordrule back in the states Join Date: Dec 2002 Location: Clarksville, TN/ Fort Campbell, KY Posts: 5,627 Blog Entries: 1	Re: Adjusting rev down/idle issues how much was the canister and DPFE. i think i have the same problems with mine. but then again i haven't driven mine in almost 2.5 yrs try a datalog with ur wideband hooked up and see what it looks like.... __________________ We Can Rebuild Her 3L MoToR:02 3L, SVT UIM/LIM/TB/INJ/CAMS, st200 springs, pnp, xcal 2,PRP, hi-flo cat HMS prepped mtx-75:quaife, slick shift forks, "koated kogbox", focus tower, B&M. car mod: GMK HP CF CAI, weapon r headers, relocated battery, st200 RTSB, OMP FTSB, GC, roush swaybar, Audi RS6 HIDs, angel eyes, CF fenders/hood/mirror caps/ eclipse gas door, painted taillight covers/headlight inserts, WW grill,18" centerline,Full Roush lip Kit and spoiler, 17" Roush Ver. 2 wheels.

06-15-2008, 08:53 PM	#10 (permalink)
ironworker NECO Member Join Date: Apr 2008 Location: BEAR DELAWARE Posts: 113	Re: Adjusting rev down/idle issues If You Have One Of Those Mity-vac Vacuum Pumps Take The Vacuum Line Off Your Egr Valve While The Car Is Idleing And Hook Up The Pump, And Pump It A Couple Times, If The Idle Doesnt Change The Egr Valve Is Stuck Open And You Need A New One...

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