I have a 95 buick that has spark , fuel and a test lamp shows the injectors is pusling. Control module tested OK (we tested it 4 time sin a row to make sure it worked hot) can it be the ecm on mine too?I have a 95 buick that has spark , fuel and a test lamp shows the injectors is pusling. Control module tested OK (we tested it 4 time sin a row to make sure it worked hot) can it be the ecm on mine too?
No Spark, No Injector pulse, replaced Ignition Module.
Now has spark, still no Injector pulse.
Checked VATS key 1468 ohms = #6 key blank.
Blue wire, ouotput from VATS module to ECM =2.49 V (reading HZ with DVOM)
Changes state from 0V /2.49 V with key cycle.
Assuming this is correct, ECM should be the only solution?Same thing here, 95 Lesabre, 3800.
No Spark, No Injector pulse, replaced Ignition Module.
Now has spark, still no Injector pulse.
Checked VATS key 1468 ohms = #6 key blank.
Blue wire, ouotput from VATS module to ECM =2.49 V (reading HZ with DVOM)
Changes state from 0V /2.49 V with key cycle.
Assuming this is correct, ECM should be the only solution?
AnonymousMar 12, 2014
white smoke at idel better after few miles it clears up has plenty of power and gets good fuel milage radiator level is good no leaks changed fuel filter and fuel pump and injectorswhite smoke at idel better after few miles it clears up has plenty of power and gets good fuel milage radiator level is good no leaks changed fuel filter and fuel pump and injectors
AnonymousMar 27, 2014
will a bad fuel injector cause motor not to start on a 2004 dodge ram 2500 disielwill a bad fuel injector cause motor not to start on a 2004 dodge ram 2500 disiel
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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.
1. Freeze Powertrain Control Module (PCM) and see if the problem can be duplicated.
2. Wiggle tug test wiring for #2 injector.
3. Scope the #2 injector for a glitch when the misfire happens.
1. Test for the Exhaust Gas Recirculation (EGR)/coolant adapter gasket leaking EGR gases past the gasket.
2. Connect a vacuum pump to the MAP sensor, block the vacuum source, reset fuel trims, start the engine and add typical vacuum to the MAP sensor and check operation.
3. Test the spark output with 2 High Energy Ignition (HEI) testers, at 25 KV air gap each, at the spark plug wires to ground at wires 2 and 3, then 1 and 4 at cranking speed and engine running.
4. Test the fuel injector pulse width at the injectors compared to the scanner data.
5. Disconnect the O2 sensor, reset the fuel trims, test the system operation in open loop, test injector pulse width. Compare to the closed loop operation injector pulse width and engine operation.
6. Test the Powertrain Control Module (PCM) powers and grounds during the problem.
if it runs on starting fluid its a fuel problem.. check fuel pressure even if its a couple of pounds off, the vehicle will not run. but using starting fluid may give you the extra poundage you need to make it run . also check vacuum hose at pressure regulator on fuel rail
has new module
problem solved ;;;;;; bad ECM
I have a 95 buick that has spark , fuel and a test lamp shows the injectors is pusling. Control module tested OK (we tested it 4 time sin a row to make sure it worked hot) can it be the ecm on mine too?
Same thing here, 95 Lesabre, 3800.
No Spark, No Injector pulse, replaced Ignition Module.
Now has spark, still no Injector pulse.
Checked VATS key 1468 ohms = #6 key blank.
Blue wire, ouotput from VATS module to ECM =2.49 V (reading HZ with DVOM)
Changes state from 0V /2.49 V with key cycle.
Assuming this is correct, ECM should be the only solution?
white smoke at idel better after few miles it clears up has plenty of power and gets good fuel milage radiator level is good no leaks changed fuel filter and fuel pump and injectors
will a bad fuel injector cause motor not to start on a 2004 dodge ram 2500 disiel
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