Stalling after the engine is warm

Bad89stang · 01-19-2003, 10:48 PM

I have a 5 speed 89 coupe that runs great when it is cold. After the temperatrue goes up to operating range it has bad idle problems. If I am driving at a constant speed for awhile and then come to a light... I usually push in the clutch and hit the brakes. This is when the motor will die. If I wait until the last minute to push in the clutch(almost stopped) then it will not stall. I get some surging from time to time if the engine is warm.
I have already checked the TPS and it measured .98
I have cleaned the IAC several times and even tried another one(used). I did reset the computer after switching out the IAC.
This is really getting old. Should I just go buy another IAC and try it? Any ideas?

PKRWUD · 01-20-2003, 03:36 AM

Check the EGR

Bad89stang · 01-20-2003, 10:34 PM

Chris, how do I check the EGR? Is there a test that I can run? Should I just remove it and clean it?

Coupe50h · 01-20-2003, 11:54 PM

tfi module? maf? or weak fuel pump, possibly the pip pickup in the distributor?
my car used to die mysteriously with my old fuel pump wich finally quit a few weeks later, now it has never died since, with it's autozone pump

fuel or spark delivery, just gotta narrow it down, need a scanner so you dont end up replacing everything.
hope you fix it...

PKRWUD · 01-21-2003, 12:28 AM

Quote:

Originally posted by Bad89stang
Chris, how do I check the EGR? Is there a test that I can run? Should I just remove it and clean it?

first check it w/ a hand vacuum pump, and see what kind of effect it has at idle, then I'd pull it and inspect it.

stevenpiper16 · 01-21-2003, 05:39 AM

Chances are you've got problems with your o2 sensors. Mine was doing the same thing but it's an 87. The guy that had it before me had cut the wires somehow going to the o2 sensors so he fixed it by using some sort of really crappy connector. Since these devices are very resistance specific the computer was gettin all sorts of weird numbers. It wasn't causing the usual surging and stuff associated with those sensors but instead died when I would push in the clutch. Simple fix? Pull thermostat. Run the damn car in open loop all the time. lol

Bad89stang · 01-21-2003, 08:44 AM

O.K. Thanks. I will check them out.

fongo · 01-21-2003, 01:11 PM

I'd replace the IAC valve. That happened to me a while back and, in addition, the car would stall if I had the A/C running too. I popped in a brand new IAC and it went away.
Your EGR valve could also be involved, but I don;t think it effects the idle as much, it's more for recycling the gases coming from the crankcase.
Good luck!
fongo

Bad89stang · 01-21-2003, 10:13 PM

Thanks fongo...

I am going to replace the IAC tonight just to get it out of my mind. It really does it bad with the A/C like you said. We'll see. I will let everyone know if I get it figured out.

01-19-2003, 10:48 PM	#1
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	Stalling after the engine is warm I have a 5 speed 89 coupe that runs great when it is cold. After the temperatrue goes up to operating range it has bad idle problems. If I am driving at a constant speed for awhile and then come to a light... I usually push in the clutch and hit the brakes. This is when the motor will die. If I wait until the last minute to push in the clutch(almost stopped) then it will not stall. I get some surging from time to time if the engine is warm. I have already checked the TPS and it measured .98 I have cleaned the IAC several times and even tried another one(used). I did reset the computer after switching out the IAC. This is really getting old. Should I just go buy another IAC and try it? Any ideas?

01-20-2003, 03:36 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Check the EGR __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

01-20-2003, 10:34 PM	#3
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	EGR Chris, how do I check the EGR? Is there a test that I can run? Should I just remove it and clean it? __________________ You're gonna need your seatbelt

01-20-2003, 11:54 PM	#4
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	tfi module? maf? or weak fuel pump, possibly the pip pickup in the distributor? my car used to die mysteriously with my old fuel pump wich finally quit a few weeks later, now it has never died since, with it's autozone pump fuel or spark delivery, just gotta narrow it down, need a scanner so you dont end up replacing everything. hope you fix it... __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

01-21-2003, 08:44 AM	#7
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	. O.K. Thanks. I will check them out.

01-21-2003, 05:39 AM	#6
stevenpiper16 Registered Member Join Date: Jan 2003 Posts: 1	Chances are you've got problems with your o2 sensors. Mine was doing the same thing but it's an 87. The guy that had it before me had cut the wires somehow going to the o2 sensors so he fixed it by using some sort of really crappy connector. Since these devices are very resistance specific the computer was gettin all sorts of weird numbers. It wasn't causing the usual surging and stuff associated with those sensors but instead died when I would push in the clutch. Simple fix? Pull thermostat. Run the damn car in open loop all the time. lol

01-21-2003, 01:11 PM	#8
fongo Registered Member Join Date: Jan 1999 Location: Farmingdale, NY Posts: 139	I'd replace the IAC valve. That happened to me a while back and, in addition, the car would stall if I had the A/C running too. I popped in a brand new IAC and it went away. Your EGR valve could also be involved, but I don;t think it effects the idle as much, it's more for recycling the gases coming from the crankcase. Good luck! fongo __________________ 1993 GT, MAC Fenderwell Cold Air Induction; Accel dist.,Splitfire plugs, BBK: 1 5/8 unequal length shorties, hi flow H-pipe w/ cats; Flowmasters 2 chamber American Thunder catback system, Motorsports 3-core radiator, 180º thermostat, BBK adj. clutch quad...the rest is bone stock!..but more mods to come!!

01-21-2003, 10:13 PM	#9
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	muchas gracias Thanks fongo... I am going to replace the IAC tonight just to get it out of my mind. It really does it bad with the A/C like you said. We'll see. I will let everyone know if I get it figured out. __________________ You're gonna need your seatbelt

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rare Mustangs....Got One?	1969Mach1	Blue Oval Lounge	22	09-25-2010 04:59 AM
Very bad experience with Engine Dynamics of San Jose CA	JAGraff	Classic Mustangs	8	06-16-2005 11:43 AM
Very bad experience with Engine Dynamics of San Jose CA	JAGraff	Racer's Club House	0	05-12-1999 02:27 AM