I have a problem

BB90GT · 04-18-2007

The car will run okay but for some reason when you are coming down in the RPMs the car will just dye. Other times the car will just surge like go from idleing at 1000 rpms to 100 then back up or die depending on the day. I have put 3 different IAC valves on the car granted they werent brand new but one of them should have helped. I am wondering if it is the fuel pump or maybe the timing if off the car has never done this before until I fixed the head gaskets the right way then it did not do it for a while then it started doing this all the sudden. Like I said the car runs good other than these problems oh and of course the exhaust leak that I cant seem to find. PLEASE HELP with this problem.

bobbys97R · 04-18-2007

is the IAC the same as the mass air? if not my car did the same thing right before the mass air took a crap

BB90GT · 04-18-2007

The IAC is different but the mass air meter going bad could be an issue all though it is only like 2 years old.

WyoCobra · 04-18-2007

Did you try messing with the idle screw?

koolkat94 · 04-18-2007

Look for a vacuum line off also. Also look at the heated wire on the mass air sensor and see if it is dirty, have seen this cause problems also.

BB90GT · 04-18-2007

I will check the hot wire on the mass air but all the vacuum lines are on and in the right place.

BB90GT · 04-18-2007

I havent tried the idle screw yet cause the car never did this before so I figured as long as its tight then it should be in the same position s before when it ran great all the time. But I will check it and adjust if need be. Thanks jinxd and koolkat

NoMo5o · 04-18-2007

We had a similar problem on my brothers car when we first got it finished. It would die at stopsigns and just about die any time you got off of the throttle. Other than that it ran great. We added a MSD 6AL and opened the plug gap to .50 and never had the problem again.

Gtconv91 · 04-18-2007

had a similar issue especially when it was warm or hot outside.. finally we replaced the fuel regulator and it went away but it would die and not be able to start or run for about an hour at some occasions..

SLMF · 04-18-2007

i would still check for a vac. leak take a can of carb spray and spray all around your intake a vac. lines if it surges there is your problem....

04-18-2007	#1 (permalink)
BB90GT Junior Member Join Date: Aug 2006 Posts: 902 iTrader: (3) Friends: (5) Last Online: 3 Days Ago 03:58 PM Time Spent Online: 4 Days 1 Hour 31 Minutes 26 Seconds My Album's: BB90GT's album My Garage: BB90GT's Garage Thanks: 0 Thanked 3 Times in 3 Posts	I have a problem The car will run okay but for some reason when you are coming down in the RPMs the car will just dye. Other times the car will just surge like go from idleing at 1000 rpms to 100 then back up or die depending on the day. I have put 3 different IAC valves on the car granted they werent brand new but one of them should have helped. I am wondering if it is the fuel pump or maybe the timing if off the car has never done this before until I fixed the head gaskets the right way then it did not do it for a while then it started doing this all the sudden. Like I said the car runs good other than these problems oh and of course the exhaust leak that I cant seem to find. PLEASE HELP with this problem.

04-18-2007	#2 (permalink)
bobbys97R Raptor 6.2 Real Name: Bobby Join Date: Aug 2006 Location: Liberty Village, England Posts: 9,306 MySpace ID: Bobbys97R iTrader: (1) Friends: (25) Last Online: 2 Hours Ago 12:08 AM Time Spent Online: 1 Week 2 Days 6 Hours 59 Minutes 26 Seconds My Album's: bobbys97R's album My Garage: bobbys97R's Garage Thanks: 2 Thanked 9 Times in 9 Posts	is the IAC the same as the mass air? if not my car did the same thing right before the mass air took a crap __________________

04-18-2007	#5 (permalink)
koolkat94 Supporting Vendor Join Date: Aug 2006 Location: Cheyenne WY Posts: 514 iTrader: (6) Friends: (5) Last Online: 06-26-2009 12:42 PM Time Spent Online: 2 Minutes 53 Seconds My Album's: koolkat94's album Thanks: 0 Thanked 0 Times in 0 Posts	Look for a vacuum line off also. Also look at the heated wire on the mass air sensor and see if it is dirty, have seen this cause problems also. __________________ Try a 16 sec 3/8 mile with 2 180's

04-18-2007	#8 (permalink)
NoMo5o Gold Member Join Date: Aug 2006 Location: Colorado Springs CO Posts: 400 iTrader: (0) Friends: (1) Last Online: 05-10-2011 12:45 AM Time Spent Online: 11 Hours 32 Minutes 47 Seconds My Album's: NoMo5o's album Thanks: 0 Thanked 0 Times in 0 Posts	We had a similar problem on my brothers car when we first got it finished. It would die at stopsigns and just about die any time you got off of the throttle. Other than that it ran great. We added a MSD 6AL and opened the plug gap to .50 and never had the problem again. __________________

04-18-2007	#9 (permalink)
Gtconv91 I need a Beer Join Date: Aug 2006 Location: Cheyenne, Wy Posts: 2,644 iTrader: (2) Friends: (4) Last Online: 1 Day Ago 03:23 PM Time Spent Online: 1 Day 23 Hours 58 Minutes 30 Seconds My Album's: Gtconv91's album My Garage: Gtconv91's Garage Thanks: 0 Thanked 1 Time in 1 Post	had a similar issue especially when it was warm or hot outside.. finally we replaced the fuel regulator and it went away but it would die and not be able to start or run for about an hour at some occasions.. __________________ slow.......... 12.30 @ 110 91 Gt conv

04-18-2007	#3 (permalink)
BB90GT Junior Member Join Date: Aug 2006 Posts: 902 iTrader: (3) Friends: (5) Last Online: 3 Days Ago 03:58 PM Time Spent Online: 4 Days 1 Hour 31 Minutes 26 Seconds My Album's: BB90GT's album My Garage: BB90GT's Garage Thanks: 0 Thanked 3 Times in 3 Posts	The IAC is different but the mass air meter going bad could be an issue all though it is only like 2 years old.

04-18-2007	#4 (permalink)
WyoCobra Gold Member Join Date: Aug 2006 Location: Cheyenne, WY Posts: 485 iTrader: (0) Friends: (3) Last Online: 12-27-2010 06:09 PM Time Spent Online: 1 Day 2 Hours 58 Minutes 5 Seconds My Album's: WyoCobra's album My Garage: WyoCobra's Garage Thanks: 0 Thanked 0 Times in 0 Posts	Did you try messing with the idle screw?

04-18-2007	#6 (permalink)
BB90GT Junior Member Join Date: Aug 2006 Posts: 902 iTrader: (3) Friends: (5) Last Online: 3 Days Ago 03:58 PM Time Spent Online: 4 Days 1 Hour 31 Minutes 26 Seconds My Album's: BB90GT's album My Garage: BB90GT's Garage Thanks: 0 Thanked 3 Times in 3 Posts	I will check the hot wire on the mass air but all the vacuum lines are on and in the right place.

04-18-2007	#7 (permalink)
BB90GT Junior Member Join Date: Aug 2006 Posts: 902 iTrader: (3) Friends: (5) Last Online: 3 Days Ago 03:58 PM Time Spent Online: 4 Days 1 Hour 31 Minutes 26 Seconds My Album's: BB90GT's album My Garage: BB90GT's Garage Thanks: 0 Thanked 3 Times in 3 Posts	I havent tried the idle screw yet cause the car never did this before so I figured as long as its tight then it should be in the same position s before when it ran great all the time. But I will check it and adjust if need be. Thanks jinxd and koolkat

04-18-2007	#10 (permalink)
SLMF Gold Member Join Date: Sep 2006 Posts: 111 iTrader: (0) Friends: (2) Last Online: 04-06-2010 12:45 AM Time Spent Online: 1 Hour 45 Minutes 26 Seconds My Album's: SLMF's album Thanks: 0 Thanked 0 Times in 0 Posts	i would still check for a vac. leak take a can of carb spray and spray all around your intake a vac. lines if it surges there is your problem.... __________________ ITS SLOW BUT ITS MINE!!!!! 11.50 @120MPH

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