4v swap in 01 gt...Idle/Run problems!

Broke4.6 · March 6th, 2011, 04:24 PM

alright guys...finally started up my car the other day and its not really what i expected considering everyone that has done the swap said they started up there car and it ran fine an they got a tune asap to get full power! this is clearly not my case

ive checked all vacume and have plugged everything in correctly.

as soon as you start it up it shoots up to 3k rpm and then falls down to about 300 rpms and sounds like its cammed...you give it some throttle and has NO response then shoots up an back fires and does its own thing...idk what the deal is..ive tried everything...coil pack polarity's are switched and everythings good there...im stumped guys!

could it be to much fuel messing everything up? its really no different from the other setups ive seen!

Aeromotive fuel rails
24# injectors
focus pump

YouTube - 32v swapped GT runs

mfj · March 6th, 2011, 05:10 PM

What harness and computer are you running?

Broke4.6 · March 6th, 2011, 05:24 PM

made the 2v harness work..wired in the COP harness and moved some connectors around the computer is a stock 2v comp

manolith · March 6th, 2011, 06:13 PM

could it be that you dont have the maf hooked up?

Broke4.6 · March 6th, 2011, 06:25 PM

it runs worse with the maf hooked up! lol

majorownage · March 7th, 2011, 09:52 AM

is the maf the stock one from the gt?

try switching your iac, crank and cam position sensor

rst1523 · March 7th, 2011, 05:02 PM

maybe the tps??

rst1523 · March 7th, 2011, 05:04 PM

Originally Posted by manolith

could it be that you dont have the maf hooked up?

i thought the car would not run without it connected

mfj · March 7th, 2011, 05:41 PM

Originally Posted by rst1523

i thought the car would not run without it connected

False:..........

rst1523 · March 7th, 2011, 06:31 PM

Originally Posted by mfj

False:..........

how so? you are not getting a reading of air flow

mfj · March 7th, 2011, 08:31 PM

Originally Posted by rst1523

how so? you are not getting a reading of air flow

True but your o2 sensors will compensate by reading the air/fuel at idle and trying it's best to control the injectors to let the engine idle. Don't believe me? Turn your car on and unplug your MAF. It won't shut off...

manolith · March 7th, 2011, 11:44 PM

Originally Posted by mfj

True but your o2 sensors will compensate by reading the air/fuel at idle and trying it's best to control the injectors to let the engine idle. Don't believe me? Turn your car on and unplug your MAF. It won't shut off...

what if the o2s are shot or off like mine?

mfj · March 8th, 2011, 10:56 AM

Originally Posted by manolith

what if the o2s are shot or off like mine?

Your rear O2s are shut off because their only job is to see if your cats are working. The front 02s are never shut off. Their job is to make the car idle.

Edit: if your O2's are shot, then the car probably won't idle.

manolith · March 8th, 2011, 11:11 AM

My front o2 are off. I broke the wiring harness for one of them when I changed my clutch. Car idles fine tho. Have them off on the tuner so I don't get the check engine light.

Nightmare69 · March 8th, 2011, 11:37 AM

Originally Posted by manolith

My front o2 are off. I broke the wiring harness for one of them when I changed my clutch. Car idles fine tho. Have them off on the tuner so I don't get the check engine light.

Your tuner lets you turn the front 02s off? Mine only let me shut off the rears since I dont have cats.

mfj · March 8th, 2011, 11:47 AM

Originally Posted by manolith

My front o2 are off. I broke the wiring harness for one of them when I changed my clutch. Car idles fine tho. Have them off on the tuner so I don't get the check engine light.

That doesn't sound right...

March 6th, 2011, 05:10 PM	#2
mfj Banned 2001 Cobra Join Date: Feb 2011 Location: Hot Town, AZ Posts: 416 iTrader: 0 reviews	What harness and computer are you running? __________________ 2001 Cobra- Stroked/Poked/Cammed/Blown 1996 Cobra- CF Clutch/STS/Lowered/CAI- otherwise stock... The daily driver... [SIZE="5"][B][COLOR="Blue"]MM Cobra Club #3.4[/COLOR][/B][/SIZE] [SIGPIC][/SIGPIC]

March 6th, 2011, 05:24 PM	#3
Broke4.6 Regular Join Date: May 2010 Location: Sacramento Posts: 84 iTrader: 0 reviews	made the 2v harness work..wired in the COP harness and moved some connectors around the computer is a stock 2v comp __________________ 01 GT - 32v swap - Bassani - Spec - Mac

March 6th, 2011, 06:13 PM	#4
manolith Hardcore Enthusiast 11 Mustang GT Track times coming soon. Join Date: Jun 2010 Location: Miami Posts: 1,721 iTrader: 0 reviews	could it be that you dont have the maf hooked up? __________________ 2011 Mustang GT MT. Ford Racing K springs, Boss intake manifold, JLT Cold air intake, BBR O/R Xpipe, Ford Racing 4.10 gears, TA Rear End Girdle, VMP E85 Tune/BBR 93 Tune.

March 6th, 2011, 06:25 PM	#5
Broke4.6 Regular Join Date: May 2010 Location: Sacramento Posts: 84 iTrader: 0 reviews	it runs worse with the maf hooked up! lol __________________ 01 GT - 32v swap - Bassani - Spec - Mac

March 7th, 2011, 09:52 AM	#6
majorownage Regular Join Date: Jun 2010 Posts: 424 iTrader: 0 reviews	is the maf the stock one from the gt? try switching your iac, crank and cam position sensor __________________ 1998 Gt full pi swap -Dead and gone 1998 Mark VIII 4.30s, 125 shot, 93 d/s-Daily Driver 1998 BAB Cobra-Project

March 7th, 2011, 05:02 PM	#7
rst1523 Regular 2003 Mach 1 Join Date: Jun 2010 Location: Suwanee, GA Posts: 179 iTrader: 0 reviews	maybe the tps??

March 8th, 2011, 11:11 AM	#14
manolith Hardcore Enthusiast 11 Mustang GT Track times coming soon. Join Date: Jun 2010 Location: Miami Posts: 1,721 iTrader: 0 reviews	My front o2 are off. I broke the wiring harness for one of them when I changed my clutch. Car idles fine tho. Have them off on the tuner so I don't get the check engine light. __________________ 2011 Mustang GT MT. Ford Racing K springs, Boss intake manifold, JLT Cold air intake, BBR O/R Xpipe, Ford Racing 4.10 gears, TA Rear End Girdle, VMP E85 Tune/BBR 93 Tune.

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

LinkBacks (?) LinkBack to this Thread: http://www.moddedmustangs.com/forums/4v-svt/207268-4v-swap-01-gt-idle-run-problems.html
Posted By	For	Type	Date
Thread 4v swap in 01 gt...Idle/Run problems! \| Forums at Modded Mustangs \| BoardReader	This thread	Refback	April 24th, 2012 01:44 AM

Threads Similar to: 4v swap in 01 gt...Idle/Run problems!
Thread	Thread Starter	Forum	Replies	Last Post
Idle problems	GTsetGO	99-04	27	March 18th, 2010 09:36 PM
idle problems	flattusmaximus78	5.0 Mustangs	18	March 26th, 2009 08:19 AM
idle problems	roush 2001	5.0 Mustangs	6	March 12th, 2008 12:20 AM
Idle problems in my 89.....	RIDIN5.0	5.0 Mustangs	3	February 9th, 2007 06:39 PM
Idle Problems Code 1506, Idle Overspeed Error	jagstang96	96-98	3	August 29th, 2006 04:11 AM

All times are GMT -4. The time now is 05:03 PM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.