Well good job my old uncle isnt alive,he used to set light to japanese motors and bike in the early sixties,got took to court and the judge was an ex POW as well .Anyway this isnt helping you ---right first of all a physical check of the sensor and the operating mechanism,ie the pick up for induction sensor is their anything loose on whatever its picking up from ??you have changed the sensor i take it ??right only other posibility is a speed govenor control on this vehile that you are not aware of ---like a cruise control but its not ,it limits speed for when the kids drive the car .seen this on a renault as it got me i had to drive it 50km with speed limited to 80kms never knew it had this knob thingy ,ask in the dealers bet they know where it is or if it was fitted with one
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run the fault codes and check for problem ECM
There is an electronic component failure in the injector circuit that when over heats , shuts that injector circuit down
try replacing the ECM with a known good unit
Lost injector pulse. First injector power is supplied by (IGN+) or fues block ,The injector are multi-potr not individual they are fired together,not individually, Now if you lost injection pulse youll need to inspect the Distributor,the pick up is highly suspectable to terminal corrosion, it corrodes easily,so be ready to replace the pick up with a module, (this is spark I know we are on Injector), Do you have spark, then leave this alone, Test injector pulse not at the injector because again its bank fire or group fired You ll need to test thes the connector harness connector,of the injectors.As long as there is spark you should have injector pulse from the injector sub harness connector make your way to the ECM , The ECM controls the energizing of the injector with a transitor or quad driver,they are synchronized to primary ignition . Here a solution if no spark correct for spark. Its either a Distributor pick up failure with ICM module.Do this only is you have no spark.If you have spark and no Injector ,replace ECM
Actually the injectors don't spray "all the time". They pulse open for a few milliseconds then close every time they are grounded by the ECM. The distributor has a pick-up coil (Variable Reluctance sensor) that provides an A/C (Alternating Current) pulse every 120 degrees of crankshaft revolution to the Ignition Control Module also contained inside the distributor. The I.C.M. amplifies, rectifies and passes along the pules as a +12V square wave to the ECM. The ECM uses these pulses to calculate RPM and determine when the engine is rotating vs. stopped. Together with this information and more from Coolant Temp., Throttle Position, Manifold Pressure and Air Temp. the computer constantly 'looks up' what the appropriate amount of time it should pulse the injectors for to deliver the required amount of fuel.
With that in mind, the injectors are supplied with +12V via a 3 AMP fuse labeled INJ 1 for 1 bank of 3 injectors, and INJ 2 for the 2nd bank of injectors. Make sure your injectors are getting +12V whenever the key is ON or they wont fire (or at least 3 won't).
If all 6 injectors have +12V and you have fuel pressure (checked by pushing down in the center of the Schrader (tire valve stem looking thing) valve and fuel SPRAYING out, and your still not getting fuel it is probably because the injectors aren't pulsing. They are probably not pulsing because the ECM is not receiving any reference pulses from the distributor. If you have spark then you are producing reference pulses.
I hope some of this explained from an actual '86 Fiero GT 2.8L V6 owner/mechanic will help narrow down your problem.
You probably have a bad ecm. These engines used the same ecm that the injected b2200 used and they had a lot of problems with capacitors that leaked and damaged the etching on the ecm's circuit board. If you do indeed have 12V on one side of the injectors and no pulsing ground from the ecm, then the problem either in the ecm or the wiring between the ecm and the injectors. When you say good ecm, have you tried a known good one? If you're really good at desoldering and repairing pc boards, you can fix it yourself, all you'll need is a 47uF capacitor. Or you can send it out.
The ECM or electronic control module does fire the injectors, however, the injector pulse that the control module uses to fire the injectors is generated from the igniton module inside of the distributor and then the injector pulse is processed through the control module.
Most likely the ignition module that is inside of the distributor is faulty, or there is a damaged or grounded wire between the control module and the control unit. If there is no problem to be found with the ignition module inside of the distributor or with the wiring between the control module and the ignition module inside of the distributor, then the problem will be with the electronic control module itself. Also, check all of the fuses to the ECM.
Let me know if you require any further assistance.
YOUR INJECTOR DRIVERS ARE IN THE ECM(COMPUTER). IVE HAD THIS PROBLEM BEFORE AND IT WAS JUST THAT. GOOD THAT U HAVE POWER BUT THE ECM SENDS YOUR PULSE WIDTH GROUND TO THE INJECTORS. IF U WANT TO SAVE SOME MONEY U CAN GET A KNOWN GOOD ECM FROM SCRAP YARD FOR AROUND 30 BUCKS AND TRY. IF NOT POSSIBLY BROKEN WIRE FROM ECM BUT IF U HAVE BEEN DOING MAJORITY OF MAINTENANCE THEN ECM MAY BE CULPRIT
injector pulse is just controlled by the ecm or computer as some would say,u said u replaced wires? did u have a fire or melt wires? ecm is known to go bad on these,had a few of these trucks back in the day.