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Chevyguy · 05-06-2003, 08:10 AM

You bring your TFI to Auto Zone and they test it for you for Free. Two problems though. First you need to find someone there that can actually do the test, depends on the store

Second, the TFI fails due to heat soaking. A cold module may test fine off the car, but will fail while running.

Good rule of thumb, if it's a original unit, replace it. There was a reacall on these units due to stalling etc..

The Wells unit Auto Zone sells is about as good as a Motorcraft one, the expensive aftermarket units don't really do anything more for you , they just cost more. I paid $40 or so for my unit.

05-06-2003, 08:10 AM	#6
Chevyguy Backyard Mechanic/Chemist Join Date: Feb 2001 Location: Acton MA USA Posts: 435	You bring your TFI to Auto Zone and they test it for you for Free. Two problems though. First you need to find someone there that can actually do the test, depends on the store Second, the TFI fails due to heat soaking. A cold module may test fine off the car, but will fail while running. Good rule of thumb, if it's a original unit, replace it. There was a reacall on these units due to stalling etc.. The Wells unit Auto Zone sells is about as good as a Motorcraft one, the expensive aftermarket units don't really do anything more for you , they just cost more. I paid $40 or so for my unit. __________________ 2001 Crown Vic Maurader Airbox/MAF, DR chip Edel IAS shocks Single exhaust :wtf: 93 P-71 Vic interceptor Backup car now 90 5.0 LX Notch SOLD 74 Chevy Laguna type S-3 454 under construction Currently apart undergoing bodywork.