Introduction
It can also cause a bad miss on an erratic basis.
Diagnosing the Module
If ignition problems are experienced, the first thing to do is to install a timing light and watch for an irregular spark. On some trucks and cars in the 1990s, the module was located on the radiator help housing within a heat sink. It contains solid society components encased in a thick undarkened electrolytic movie. Its leading speck is to packages the hall-effect expression indicating top dead centre on the digit one cylinder to the electronic engine force (EEC-IV).The pc then takes the expression and the pulse degree and determines the rpm. The pc sends a word to the control module when to glow the coil. The control module automatically controls the dwell for sufficient saturation of the coil windings to convey the Correct Glimmer existence habituated the rpm in de facto duration without creating undue heat. It and monitors irregular or missed firing counts and Testament locate a code provided a failure is looming.
On the contrary, this does not always assignment properly. There retain been many problems with this operation, stemming from heat saturation, cracking and a horde of problems after a space of servicing.
Failure
The modules Testament fail once they hog absorbed as well still heat or for event problems. When this happens the vehicle Testament stall and holding a room of extent for a successful restart after the heat has dissipated.Ford used the TFI ignition module (thick movie ignition) on vehicles from 1983 buttoned up the mid-1990s by oneself. The vehicles that used this module had a conventional hall-effect distributor with a seperate coil. The TFI module was located on a Apartment lodgings nature on the pattern of the distributor.
If there is, check the plugs. If the plugs are alright, the module should be replaced. They are not expensive, however, they require a small special tool to remove the torx screws in the module housing. If there was no misfire, but the vehicle is hard to begin or stalls, the module should be inspected and replaced if found to be faulty.
The module should be removed and checked for cracking around the torx screw mounting surface. There should be a thick film of dielectric grease on the back metal side of the module. This layer of grease keeps the heat off of the module. If the module looks OK but the grease is depleted, it should be replaced and the module can be tried again by using the timing light for steady spark.
The PIP signal should also be checked. The top wire on the connector is used to check for PIP. Use a voltmeter and look for pulsing with the engine running. The pulsing means the wire from the computer to the ignition control module is good and the computer is working. If it is working, the module is bad. If no pulsing is noted, check the third terminal down for pulses to the computer. It would be wise to replace these modules every 30,000 miles as a preventative maintenance procedure considering the amount of failures and the relatively low cost versus the aggravation should a failure occur. The modules have never been modified so the new will only last as long as the old one.
