TFI questions

Bad89stang · 07-02-2003, 10:33 AM

Well, I have done extensive searches on the TFI subject to see if that is possibly my problem, but it does not match up completely.

My car completely cuts out once it starts to get warm and then gets worse progressively. The voltmeter stays constant so I don't think it is a ground or 12V source coming loose. The motor DOES NOT DIE, but simply looses total power as if turning off a light switch and then back on a split second later. Could this be ignition related? I have a Crane HI6 box that has only been installed for 5 months, but the test light shows that it is fine.

I have swapped the coil for another just to test and that was not it.

I had the TFI tested at Autozone and it tested good. He got it plenty warm to simulate driving for awhile.

I am stumped.

LX XLR8R · 07-02-2003, 10:55 AM

sounds more like fuel pressure..how is your pump..if it was the TFI then it will do one of 2 things...run lean up top, or car will die and not run till let sit for a while..both have happened to me..the one where it dies and wont start is a very common problem but my car once actally ran real real lean upstairs to the point of fuel starvation cut out..it turned out that the TFI module also controls something with the fuel..never looked into how exaclty becasue when i swapped mine out my car ran like a rapped ape and i didnt care anymore

Bad89stang · 07-02-2003, 11:06 AM

Fuel pressure looks fine. I can only check it idle with the gauge that is under the hood. I can't test the lean up top part because if it were to cut out like that at WOT or high speeds it would be very hard on the car/drivetrain.

LX XLR8R · 07-02-2003, 12:20 PM

check to make sure your positive cable isnt shorting out anywhere also

Bad89stang · 07-02-2003, 12:22 PM

Voltmeter does not fluctuate as stated above. The battery is in the trunk and the 00 gauge welding cable could probably outlast a car fire.

Very well mounted and hooked up. Thanks for idea though.

LX XLR8R · 07-02-2003, 01:08 PM

yea i used welding cable on all my trunk installs..works the best..it sure does sound like what happened when my positive terminal was grounding out when my battery was loose in the trunk..other than that im kinda stumped becasue it happes when the car warms up witch usually indicated TFI/fuel pump..yo got me thinking

Bad89stang · 07-02-2003, 01:11 PM

I am going to switch out my TFI for another one before I go out and buy one. Just to make sure.

07-02-2003, 10:33 AM	#1
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	TFI questions Well, I have done extensive searches on the TFI subject to see if that is possibly my problem, but it does not match up completely. My car completely cuts out once it starts to get warm and then gets worse progressively. The voltmeter stays constant so I don't think it is a ground or 12V source coming loose. The motor DOES NOT DIE, but simply looses total power as if turning off a light switch and then back on a split second later. Could this be ignition related? I have a Crane HI6 box that has only been installed for 5 months, but the test light shows that it is fine. I have swapped the coil for another just to test and that was not it. I had the TFI tested at Autozone and it tested good. He got it plenty warm to simulate driving for awhile. I am stumped. __________________ You're gonna need your seatbelt

07-02-2003, 10:55 AM	#2
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	sounds more like fuel pressure..how is your pump..if it was the TFI then it will do one of 2 things...run lean up top, or car will die and not run till let sit for a while..both have happened to me..the one where it dies and wont start is a very common problem but my car once actally ran real real lean upstairs to the point of fuel starvation cut out..it turned out that the TFI module also controls something with the fuel..never looked into how exaclty becasue when i swapped mine out my car ran like a rapped ape and i didnt care anymore __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

07-02-2003, 11:06 AM	#3
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	Fuel pressure looks fine. I can only check it idle with the gauge that is under the hood. I can't test the lean up top part because if it were to cut out like that at WOT or high speeds it would be very hard on the car/drivetrain. __________________ You're gonna need your seatbelt

07-02-2003, 12:20 PM	#4
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	check to make sure your positive cable isnt shorting out anywhere also __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

07-02-2003, 12:22 PM	#5
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	Voltmeter does not fluctuate as stated above. The battery is in the trunk and the 00 gauge welding cable could probably outlast a car fire. Very well mounted and hooked up. Thanks for idea though. __________________ You're gonna need your seatbelt

07-02-2003, 01:08 PM	#6
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	yea i used welding cable on all my trunk installs..works the best..it sure does sound like what happened when my positive terminal was grounding out when my battery was loose in the trunk..other than that im kinda stumped becasue it happes when the car warms up witch usually indicated TFI/fuel pump..yo got me thinking __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

07-02-2003, 01:11 PM	#7
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	I am going to switch out my TFI for another one before I go out and buy one. Just to make sure. __________________ You're gonna need your seatbelt

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Just got a 98, have some questions?	98GTNewbie	Modular Madness	5	08-30-2003 12:41 AM
Quick questions on Explorer Intake install.	Falcons Talon	Windsor Power	2	08-21-2003 12:40 PM
Several questions about oil.	zepherman	Windsor Power	3	08-03-2002 06:59 AM
HELP! Newbie 95-96 GT questions	Ron Brooks	Blue Oval Lounge	7	07-11-2001 07:38 PM
S/R Questions	DAMION	Racer's Club House	1	09-30-1999 11:02 AM