Question about 1990 Jeep Wrangler

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No injector pulse, no current to the injector

I tested it with a noid light, it dosent light up while cranking. it has fire, fuel pump is working, fuel filter is new and in the right flow direction. is there a relay or fuse for the fuel injection?


1990 jeep wrangler yj 2.5l 4cyl throttle body injection

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  • erickirkland Mar 13, 2009

    thanks, its wet dark and cold out, but ill give it a shot in the morning. i appreciate your help

  • perrykinney Mar 28, 2009

    I have the same problem did this fix your touble

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  • Master
  • 1,392 Answers

Check the pickup in the distributor as this is the cam sensor. The injectors run of the pulses created while the rotor is turning around. It should be a plastic disk located under the rotor button.

Posted on Mar 13, 2009

  • Eldric Venne
    Eldric Venne Mar 13, 2009

    Check your cap and rotor button while you are in there if they are fairly old. Anything more than 60k old, change them.

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1 Answer

How do i ck if fuel pump defective or no pulse at injector no power.


If you have fuel coming out of the lines when you are cranking the engine then your fuel pump is working. You should only get a small burst of fuel when you first turn the key on and then nothing while the key is on, the ECU only tells the fuel pump to turn on when cranking and when it can see cam and crank sensor signals while the engine is running. The small burst of fuel you may or may not have experienced is only to prime the fuel rails. To test your injectors, you can buy what is called a "noid" light. They have them at most stores that have a good tool/automotive section, such as sears. You unplug one injector with the engine off, plug the noid light into the injector connector (harness side going to injector). Then start or crank the engine over and see if you can see the light pulse on and of very fast. You may need two people due to limited visibility while cranking the engine. Repeat this for the rest of the injectors. If you have an "ohm" meter, you can ohm check the injectors by disconnecting each one and touching the pins inside the connector cavity on each injector. The ohm reading should read between 5-20 ohms. I hope this info helps!

Apr 26, 2015 | 1999 Subaru Legacy

1 Answer

Engine only firing on left bank rtf. Side no. Fire will start and idle


Check for spark on the side not firing. If there is spark, the injectors on the right side may have a problem in the wiring to them. Older multi port injection systems used a "bank fired" approach: all the injector grounds on one bank splice together before they go into the computer to be pulsed.
All of the injectors have a steady voltage applied to them when the key is on. The same color wire to all injectors is the power wire, it is a fused circuit, the fuse is in the power distribution box, and is hot in run or start. When the computer internally grounds the injectors, pulse occurs and fuel is sprayed out. Check if the right side has power to the injectors with key on, use a voltmeter or test light. To test an injector circuit, purchase a cheap "noid light" from a parts store. You plug it into an injector connector, then crank the engine over. If the noid light is blinking, the power and ground circuit is good for that injector.

Jun 28, 2014 | Cars & Trucks

3 Answers

1987 cheverolet camaro will not start. Replaced a but load of parts...good spark , computer is new and working , fuel pump is new and working , distributor new and working , throttle position sensor new...


I think I would be looking at the crank angle sensor and/or the cam sensors on this vehicle.It seems to me the engine isn't getting the signal to fire up.What happens when you squirt some fuel into the combustion chamber ? If it fires up I would be looking at cleaning the injectors.If it doesn't fire up What's the pressure on the fuel rail. does it have a buy pass pressure valve on the rail.Some suggestions good luck

Jun 07, 2014 | 1987 Chevrolet Camaro

1 Answer

Timing correct firing off


what engine Shawn. ? how can we guess that?
besides following the FSM steps, we could:
ive rebuilt many engines (done many from scratch) +machine work.

1: I check compression 1st. on all cylinders. (i put oil in the cyl, 1 teaspoon) (some pros run oil gallery primers pumps first in pro rebuild shops) i just crank the zero fuel engine until i see max oil pressure.)

oops. ? no oil pressure, oops, compression bad. on 1 jug.
(all that good, so)
2: i then crank it over , with no spark or fuel and check for top end oiling. Valve covers off. (so those V.C go on last)
ive watched many an noob burn up a new engine, not doing the steps in the rebuilders books. it only takes me 30min. to do this. why skip it.?

3: ok , I got top end oil, got 150psi on all jugs. (hard work pay back)

4: i check for spark all cyl. it's strong, & out comes the timing light.
oops, timing is off, or spark wires routed wrong, (dizzy engines)
i check all cylinders for hot spark and #1 timed right. and routed right.
the strobe light never ever lies to me....

MILESTONE 1: TEST FUEL moments.
5: wow ,car runs on test fuel (spray can, CRC engine start with top end lube feature) (fuel pump is shut off on purpose , in all steps to here)
i repeat this say 3 times, listening carefully for noises, that are not good. (why start the engine and watch it blow up. )
It is so good, to hear it run for 3 seconds,, wow.
im 100% sure you can get here..... if you do the steps.
Now comes, light the fires and kick the tires. not FIRST.

6: now comes fuel
how to get fueling to work.
that takes understanding the ASD and how to use a $1 NOID lamp.

I check injectors then add fuel pressure.
are the injectors firing?
injectors ,click cranking ?(stethoscope tool $5)
if not, use the NOID, is the PCM firing the NOID? y/n?

why do this , with pump dead.
Answer to not wreck your new rings, all washed free of all oil buy
injected, unburned raw fuel .. that is why.
i get all my injectors firing then , turn the fuel pump on.
its your hard labor, 50 hours? to build and engine?
wana waste all that? nah.
I last , plug my fuel pump back in,
does the PCM start enging for 2 seconds, and then cuts fuel?
BAM ASD.
http://www.fixkick.com/Jeeps/ASD.html


ive never burned up a new engine, yet,
im not lucky, or smart, just had good teachers.

jeep ways!
I kill my pump by pulling the pump feed wire.
i do that because some newer jeeps , kill everything (ASD) including spark,
if you pull the fuel pump relay. (jeeps with new pump monitor features)
so i cut the feed AFT of the relay, on all cars. (conn. pulled)
the FSM shows this spot.

hope that helps.

Apr 01, 2014 | 1999 Jeep Grand Cherokee

1 Answer

Starts cold but not when warm


Are you certain that the pump is on when the no start occurs? Do you hear it turn on with key on, not start, when the engine won't fire? It should turn on for 2 seconds to pressurize the line to the injectors. If you could, check fuel pressure when the no start occurs.

If it is the injectors, buy a cheap "noid light" to check the injector circuit. Buy the one that fits your injector harness connectors. You pull off a connector to one injector and put the noid light in the connector. When cranking the engine over the noid light should be blinking-that is the pulse that fires the injectors. The injectors have battery voltage to them any time the key is on. When the ecm momentarily grounds the injector circuit (internally in the ecm), the injector is pulsed. If the noid light does not blink or even light up when cranking, the injector circuit has a problem in the power side or the ground side.

Feb 09, 2014 | 1991 Chevrolet C/K 2500

2 Answers

I have a 89 rs camaro with the 5.0l can anybody offer suggestions on what the possible fuel system issues are with year and model? I've changed the fuel and air filters rebuilt tbi ran fuel system cl


check fuel pressure TBI injection fuel pressure should be 9 - 13 psi.make sure fuel pressure above 10 psi because throttle body need at least 10 psi. in order to work right.if all is good check see if PCM firing the fuel injectors.go to auto parts store buy noid light.to use noid light you have to disconnect fuel injector electrical connector then plug noid light into fuel injector connector.crank engine watch noid light should blink meaning PCM is firing fuel injectors if noid light steady not blinking PCM not working.if noid light dont light up you have open circuit in the fuel injectors wiring.if check engine light flashing have vechicle code scan.bad tps sensor will also cause problem you are having.

Apr 03, 2013 | Cars & Trucks

2 Answers

Why would a cylender not fire if the plug has spark and all other cylenders are firing?


What test told you it is not firing?

You may have valve damage &
little compression

Jan 09, 2013 | Cars & Trucks

1 Answer

Fuel system


CHECK FOR INJECTOR PULSE IF YOU GO TO YOUR LOCAL AUTO ZONE OR ADVANCED AUTO PARTS ASK THEM FOR THE INJECTOR NOID LIGHT KIT GO HOME AND FIGURE OUT WICH NOID LIGHT FITS YOU PLUG IT INTO THE HARNESS SIDE WHEN YOU UNPLUG 1 OF THE FUEL INJECTORS THEN CRANK ENGINE IF LIGHT FLASHES THEN THE INJECTOR SHOULD BE OPENING IF ITS NOT INJECTOR IS BAD IF ITS NOT FLASHING THEN IT COULD BE A FUSE OR CAM OR CRANK SENSOR OR A BAD PCM OR FAULTY WIRING

Aug 05, 2012 | 2000 Kia Sportage

1 Answer

What causes injector not firing gas?


FUEL INJECTOR NOT FIRING COULD BE FAULTY FUEL INJECTOR.HOOK A NOID TEST LIGHT TO FUEL INJECTOR ELECTRICAL CONNECTOR. CRANK THE ENGINE WATCH THE NOID TEST LIGHT SHOULD BE BLINKING WHILE ENGINE TURN OVER.IF TEST NOID LIGHT STEADY PCM FAULTY NOT FIRING THE FUEL INJECTOR.IF FUEL INJECTOR DONT BLINK OR LIGHT UP.YOU HAVE OPEN WIRING CIRCUIT TO THE FUEL INJECTOR CONNECTOR.

May 13, 2011 | 1990 Geo Tracker

2 Answers

Turns over but wont start i got fire and fuel to the fuel rail but the injecters are not delivering fuel any ideas whats wronge


sounds like u got no injector pulse comin from ecm.we need to pull ecm codes an review them ,possible camshaft sensors faulty they usually provide reference pulses to ecm for injector firing or pulse.without this pulse ur injectors will never open up to let fuel enter combustion chamber. one way of checking pulse is to connect a noid light(small light bulb that plugs in injector pigtail to chek for power to injector and ur pulsing ground coming from ecm to injector) an test for a blinking light while cranking engine.

Apr 08, 2011 | 1998 Ford F150 Regular Cab

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