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91 Cherokee will crank but won't fire. Replaced

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How much is the RPM showing in the datatlogger while cranking?

Posted on Dec 03, 2012

  • Dan Tighe Dec 03, 2012

    Don't know don't have access to to a data logger. Also I have replaced the crankshaft position sensor

  • Dan Tighe Dec 05, 2012

    None of the solutions have helped fix the problem. Still will not fire up. Any other suggestions would be greatly appreciated and thanks for trying to solve the problem.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 6982 Answers

SOURCE: I have a 1991 Jeep Cherokee 4.0. It ran fine

spark is triggered by the crank sensor and the cam sensor inside the distributor. but the actual signal to the coil comes from the computer. If I remember correctly the hot side of the coil runs to the back of the alternator. I am sending along a complete wiring diagram for your vehicle but I suggest you get a haynes or chiltons manual for test procedures. Don't follow their wiring diagrams or you will get side tracked to death trying to figure them out (inaccurate is a mild word)
http://www.scribd.com/doc/18999822/Jeep-Wiring-2
Since I can't do the testing from here, I;m trying to give you the best possible means and chance to figure this out. Any questions just ask!!

Posted on Mar 13, 2010

  • 972 Answers

SOURCE: got a good one. my 91 coupe original 5.0 car.

the fuel injectors are fired by computer producing a ground signal to them. so its unlikely they are fireing at once.possible power supplie problem but that would cause no injector pulse.beings how the engine was just replaced i would go over every wire and all grounds to make sure they are not shorted or pinched under a manifold or something.if you pull the plugs and they are black then you are getting to much gas. in wich case i would check to see if the fuel pressure regulator diaphram may be ruptured.if you take off the vacuum hose to it and look for moisture from gasoline. or leave hose off and try to start it if gas squirts out that regulator is bad and needs replacement

Posted on Apr 15, 2010

alicantecoli
  • 22326 Answers

SOURCE: i have a 92 ranger

it will run on a either spray without a spark but not not petrol ,now without my greasy hands under the bonnet i would ask you as you obviously can do a bit yourself to check for a spark before you go any further ,pull the centre lead out of the distributor cap and then crank engine and see if you get a spark ,the nice fat juicy blue one ,if a weak yellow spark then a least you know what your up against either a weak coil or a crank sensor or what i would go for and thats the ignition module first.Now if it was the mass iair flow then i would expect it to run but not rev up ,if it was the flow meter valve on the throttle body then i would have expected it to run with petrol sprayed into intake like you have done but to only run on either leads me to suspect the strength of the spark .Anyway dinner is served and dearly beloved is shouting *'ยก?? so i had better go ,best of british with it

Posted on Nov 02, 2010

  • 1168 Answers

SOURCE: 93 jeep cherokee country 4.0

Hello crichardson.

OK, here are all the things to check for.
Spark on all ignition wires,
compression test all cylinders,
ignition timing,
good fuel(not old or contaminated),
injectors firing (have voltage pulse).

Is the crankcase flooded with fuel? Smell the oil. Drain it if it's full of gasoline and put in fresh oil.

I have seen spark plugs that have been flooded that won't fire, even if they look clean.

If the distributor cap and rotor are old...toss them, they are cheap to buy new. Old ones can crossfire internally and rotors can short to ground.

Putting your fuel pedal to the floor while cranking shuts off the fuel injectors. This is called "clear flood mode"
I am telling you this for two reasons.
One that it may be handy to get it started and two to tell you that a shorted throttle position sensor can cause a no start.

Are there any codes stored in the computer? If there is, start there. It may lead you to your no start issue.

There you are, a few ideas, I hope that one of these helps get you running again.
Thank you for using FixYa.

KL
.

Posted on Nov 28, 2010

redds55
  • 2620 Answers

SOURCE: 85 Jeep Cherokee will crank

Check for spark at any of the sparkplugs.If there is no spark at the plug then replace the distributor ignition pickup coil.

Posted on Aug 11, 2011

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91 chevy cav z24 5 spd will not start @ times sounds like no fire other times sounds like no fuel.Replaced fuel pump,timing chain, crankshaft sensor,oil sensor,map sensor,body throttle accel sensor.st


Pull the air cleaner off and crank the engine. If puffs of air come come out of the throttle body when cranking the engine then the timing is not set correctly. Otherwise, after cranking pull a spark plug and see if it is wet with fuel and if so this indicates an ignition problem (coil, distributor/cap/rotor or faulty ECU).

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  1. The ignition system on your 5.0L uses a distributor type system and will include the following components:
    1. Ignition control module (ICM). Depending on the year of your specific Ford, it'll have a inner-fender mounted ignition control module or a distributor mounted ignition control module. hot sure which you have.
    2. Ignition coil. you replaced it.
    3. PIP (Profile Ignition Pickup) sensor. This is Ford's name for the crank sensor and is mounted inside the distributor. The most common name for this component is the pick up coil.
    4. Distributor cap and rotor. you replaced
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No fire in coil pack.


Was the timing chain damaged ?
Did you have spark from the coil before you replaced the other parts ?
Do you have battery voltage on the positive side of the coil with the key on and in crank mode ?
Is the coil wire not sparking, or are you not getting spark at the plugs ?
Is the distributor rotor turning when you crank the engine ?

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Truck wont crank. we have put new distributor cap, rotor button, coil pack, plugs, wires, and fuel pump. we also checked our firing order.


you said you repl dist cap that means you don't have a crank sensor you have electronic ing module. remove your elec ing module have it tested most auto parts stores could test your module, or check your coil at the neg terminal. should have power. if not you lost your primary volt from your batt.your secondary power is coming from your electronic ing module from the module to the pos terminal on the coil, when the eng cranks,from the coil to the dist cap , from the dist cap center to the rotor then out to the plugs,this all happen pervided the timing belt or timing chain is ok. the cumbustion chainber needs 3 things , thats fuel, air, and spark.

Apr 17, 2011 | 1996 Chevrolet K1500

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After replacing plugs, wires, coil, ignition modual, and computer, I still don't have spark.


take the cap off the distributor and have someone crank if over, it rotor doesnt turn, distributor is bad.

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So you have B+ to coil but no B+ from coil to distributor. Sounds like the ignition module.
Its not triggering coil to fire . Double check it with a test light at negative side of coil and then to ground.crank the vehicle if light flickers its ok if not its your culprit.
Should light flicker then test its the wires from coil to distributor, distributor , rotor and plug wires.
Honestly if the light flickers your not losing anything by replaceing the items from the coil tower to the plugs.

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1997 jeep cherokee 4l will not start on petrol or lpg


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