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this arcticle has been modified 08-14-06...a GM Hei module will replace the 93ATX spark igniter ...it is also called the IgnitionControlModule..GMs part number is 10482820...Niehoff # is DR400...Wells # is DR100 .....Summit Racing carries several performance HEI modules that supposedly are more reliable at higher rpms...last: ask someone at an auto parts store for an hei module for a 79 Chevy 350 Caprice......................here is the wiring for the 93 ATX 2.0: The ECU's trigger output wire (BL/O) feeds the HEI's pin 'G' (feeds the base of the HEI transistor)
Ground the HEI's pin 'W' (emitter of the HEI transistor)
Ground the HEI's base.(the mounting plate)
HEI's pin 'B' taps into the +12V dizzy feed wire (BK/P).
HEI's pin 'C' taps into the coil's primary wire (Y/G)- this is the collector of the HEI ignition transistor
93ATX has the ICM and the ignition coil inside the disty: Remove the internal ground strap inside the disty (located under the module shield.. four screws hold down the shield.. remove them)... the ground strap connects the ignitor module to the coil... 93ATX uses MECS controls exactly like the 93-95 2.5 motor ...................94-95 ATX disty: there is a separate ignition coil and ICM external to the disty.. the 94-95 use EEC4 controls... ...93-95MTX have the external ignition coil , some have the ICM module mounted on the disty and some have an externally mounted ICM located in the engine compartment. ... only the 93ATX has the IgnitionControlModule mounted inside the disty...all Probe ignition systems can use the hei module but i havent looked at each schematic yet to verify the wiring ..there are about four different wiring setups..if you want to find out yourself how to wire up the GM HEI module you would need the Ford Probe factory service manual for your specific year and model (ATX is different than MTX)..look at your schematic and the block diagram and find the transistor that fires the coil....this transistor would be the one to bypass..for 93ATX the transistor collector connects to the (-) side of the coil ( yel/grn-A wire in the 3 pin connector), the transistor base connects to pin f (blu/org) in the 6 pin connector and the transistor emitter connects to ground: pin e (black) in the 6 pin connector..the (+) of the coil is connected to power from the ignition switch (blk/pink-C terminal of the 3 pin connector)..the tach is fed off the (-) side of the coil thru a resistor (yel/blu-B terminal of the 3 pin connector).. the reason the GM hei module works is that it uses the same component that is in our IgnitionControlModules...its a high temperature rated transistor.....when a cylinder is almost at TDC a pulse from the PowertrainControlModule (computer) fires the ignition transistor and when that happens the (-) side of the coil primary gets grounded for an instant... then the coils magnetic field collapses producing a high voltage spark at the coil secondary...the spark travels to the rotor tip and then the plugs.....sometimes when an ignition transistor is failing you will see intermittent flashing of the check engine light..it will not be lit continuously..when you pull the diagnostic codes you would get a code 2 or a code 3...symptoms of a bad ignitor are: a bad intermittent misfire, engine stalling at a stop, complete engine shutdown at high speeds, no start....you can verify a bad 93ATX igniter by wiggling the six pin connector at the disty...with the engine running wiggle that connector.......if the engine shuts down the igniter is going bad.................................a second permanent fix is to buy a rebuilt distributor from Mazda (for the 93ATX)...check out Trussville Mazda.com...they are a high volume Mazda dealer with decent prices-lower prices than most other Mazda dealers ....the part number is FS01 for the 93 ATX only...(94 and 95 would have FS - XX? numbers)..i dont recommend anyone else but Mazda for 93 ATX distys because Mazda replaces all of the electronic ignition components inside the disty with new revised parts..most distributor rebuilders dont know or dont care about the very high failure rate of the OEM internal ignitor (93ATX) and use recycled parts
Ground the HEI's pin 'W' (emitter of the HEI transistor)
Ground the HEI's base.(the mounting plate)
HEI's pin 'B' taps into the +12V dizzy feed wire (BK/P).
HEI's pin 'C' taps into the coil's primary wire (Y/G)- this is the collector of the HEI ignition transistor
93ATX has the ICM and the ignition coil inside the disty: Remove the internal ground strap inside the disty (located under the module shield.. four screws hold down the shield.. remove them)... the ground strap connects the ignitor module to the coil... 93ATX uses MECS controls exactly like the 93-95 2.5 motor ...................94-95 ATX disty: there is a separate ignition coil and ICM external to the disty.. the 94-95 use EEC4 controls... ...93-95MTX have the external ignition coil , some have the ICM module mounted on the disty and some have an externally mounted ICM located in the engine compartment. ... only the 93ATX has the IgnitionControlModule mounted inside the disty...all Probe ignition systems can use the hei module but i havent looked at each schematic yet to verify the wiring ..there are about four different wiring setups..if you want to find out yourself how to wire up the GM HEI module you would need the Ford Probe factory service manual for your specific year and model (ATX is different than MTX)..look at your schematic and the block diagram and find the transistor that fires the coil....this transistor would be the one to bypass..for 93ATX the transistor collector connects to the (-) side of the coil ( yel/grn-A wire in the 3 pin connector), the transistor base connects to pin f (blu/org) in the 6 pin connector and the transistor emitter connects to ground: pin e (black) in the 6 pin connector..the (+) of the coil is connected to power from the ignition switch (blk/pink-C terminal of the 3 pin connector)..the tach is fed off the (-) side of the coil thru a resistor (yel/blu-B terminal of the 3 pin connector).. the reason the GM hei module works is that it uses the same component that is in our IgnitionControlModules...its a high temperature rated transistor.....when a cylinder is almost at TDC a pulse from the PowertrainControlModule (computer) fires the ignition transistor and when that happens the (-) side of the coil primary gets grounded for an instant... then the coils magnetic field collapses producing a high voltage spark at the coil secondary...the spark travels to the rotor tip and then the plugs.....sometimes when an ignition transistor is failing you will see intermittent flashing of the check engine light..it will not be lit continuously..when you pull the diagnostic codes you would get a code 2 or a code 3...symptoms of a bad ignitor are: a bad intermittent misfire, engine stalling at a stop, complete engine shutdown at high speeds, no start....you can verify a bad 93ATX igniter by wiggling the six pin connector at the disty...with the engine running wiggle that connector.......if the engine shuts down the igniter is going bad.................................a second permanent fix is to buy a rebuilt distributor from Mazda (for the 93ATX)...check out Trussville Mazda.com...they are a high volume Mazda dealer with decent prices-lower prices than most other Mazda dealers ....the part number is FS01 for the 93 ATX only...(94 and 95 would have FS - XX? numbers)..i dont recommend anyone else but Mazda for 93 ATX distys because Mazda replaces all of the electronic ignition components inside the disty with new revised parts..most distributor rebuilders dont know or dont care about the very high failure rate of the OEM internal ignitor (93ATX) and use recycled parts
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