Question about 1989 Jeep Wrangler

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Runs ok for 10 min then no inj pulse 2.5 engine this ditributor has no wires going to pick up coil is thi normal

Losing injector pulse after engine warms up on 1990 2.5 jeep wrangler

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  • Richard Scordino May 11, 2010

    Pulse is controlled by the computer...i believe it gets info from the cam sensor...check for codes to see if any.

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  • 54 Answers

I'm thinking the crank angle sensor is going out. I'd bet when you get no injector pulse, you loose fire too. that would tell me your crank angle sensor is gone.

Posted on May 27, 2009

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Runs good, after 30 mins stalls no injector pulse and hard to start.after 10-15 mins starts again, spark OK. changed fuel pump,distributor. Same


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

Dec 09, 2015 | 1988 Ford Tempo

1 Answer

Truck just lost power


that pertains to fuel injectors. depends on year.if it has a vortec engine it has spider wire fuel inj.sys.check fuses fuel pump pres. injector pulse.if all ok pull injectors themselves if spraying and clogged

Aug 25, 2014 | GMC Sierra Cars & Trucks

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What could I do to stop my lt1 from missfiring


Lets see coil pack, spark plug wire, spark plug, and if it is MFI maybe injector, or check injector pulse. If all those are ok, then check the compression in that cylinder, if it is low it will not fire right. Go through normal check out procedures to check each of these pull out the spark plugs, put them back on the end of the wire and check for spark. If these are ok the go on go the injector. If they are not try temporarly swapping spark plug wires with a different coil pack, if the problem follows the wire, then put on new wires. If it does not follow the wire, then the coil pack could be bad, or the signal going to it. If the spark is ok check to see if you have injector pulse signal going to injector. If it is ok replace injector. Hope this helps you.

Apr 24, 2012 | 1996 Chevrolet Caprice Classic

1 Answer

I'm not getting a spark


i just had this prob i changed the coil and igniter, prob solved. it would prob b cheeper to get a reman dist, but i had extra parts laying around that fit my distributer, double check that u have injector pulse. u can do this with a 194 light bulb, and two wires. CAREFULLY touch one wire to each of the connectors in the connecter going to the inj itself.(u do have to unplug from injetor). and attach the other end of wires to each wire coming out of the bulb.. crank engine over, if it flashes, most likely the crank sensor and distributor pick up coil is ok. thus it would need the igniter or coil tested and or replaced

Oct 18, 2011 | 1997 Honda CR-V

1 Answer

1986 pontiac fiero won't start, changed fuel pump and relay gas coming up, but no spray from injectors


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.

Mar 20, 2011 | 1986 Pontiac Fiero

2 Answers

1990 Isuzu Trooper 2.8L V6 Fuel Delivery (Electrical Problem)


Inside the distributor and on the ignition module (7 pin) one of the wires to the camshaft pick-up had pushed out of the connector when I hooked up the new module. I reinserted the wire and problem was solved.

May 13, 2009 | 1990 Isuzu Trooper

1 Answer

1999 Nissan Altima: Circut board question


Dear cindy: Your injectors are served from the fuse block by a 10A fuse. This is a brown and red wire which goes directly to the injectors and is hot all the time. The ECM makes and breaks the ground to pulse the injectors.
Coming off the ECM, are four wires which are numbered as followed. pin #102 (#1 inj) red and black, pin #107 (#2 inj) yellow and black, pin #104 (#3 inj) green and black and pin #09 (#4 inj)blue and black. These all pulse the grounds and are triggered by the ignition pulse. I hope this has shed some light on the subject.
Often you can go to a Barnes and Noble book store and find shop manuals which will give you the diagrams you seek. You don't necessarily need to buy the book if you are seeking a specific answer. Good Luck.

Feb 17, 2009 | 1999 Nissan Altima

1 Answer

I have a 2000 dakota 4cyl 2 wheel drive , driving through parking lot yesturday stalled , no start cranks ok good power to coil , good fuel pressure, inj pulse ok, coil saw cracked , installed new coil ,...


The purge solenoid is in the emmissions system not the ignition system. Part # 4669475AB list for $34.80
It should have 2 or 3 hoses going to it located in the back of the engine compartment. First check to see if maybe one of your hoses came loose or off which would cause your vehicle to do this. Try this solenoid before tearing open your distributor.

Jan 12, 2009 | 1999 Dodge Dakota

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