Question about 1989 Jeep Cherokee

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My 1989 jeep cherokee will not start.

It has a 4.0 engine. it has spark,l it has fuel it also has had low compression on cylinder #3. no lower end damage. it just died. it tuns over and almost starts. the fuel pump hums after key on.

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  • Mr BrokRench
    Mr BrokRench May 11, 2010

    How low is low on the compression? What are the compression readings on the other cylinders?



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2000 Jeep Grand Cherokee Laredo 4.7 liter code reads p0307 turn the car off when I turn it back on started misfiring and sputtering and wont stay started now help

code p 0307 is misfiring on no 7 cylinder ====causes --- engine mechanical fault ---wiring---ignition/ fuel system--injector --ECT/MAF sensor---ECM
look for low fuel pressure or ignition control module

May 31, 2016 | 2000 Jeep Grand Cherokee Laredo

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I have a 1998 grand Cherokee Laredo with a 4.0 in

spark to all 6 cylinders'
compression good is first. all 6
then spark x6, if PCM sees no spark? it CUTS fuel by DESIGN. (logic)
the fuel.
if you have spark, the test fuel works, "spray"

ever get a full tuneup this decade or every 60k miles.
no? well , now is the time, huh?
spark good to all cylinders, NOT just one, pretend its 6 engines. dig?

Sep 23, 2014 | 1998 Jeep Grand Cherokee

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Misfires are caused by one of 3 things-gas, spark, or compression-one of those is the problem. For gas, check the fuel pressure and see if it is at the right pressure for your car. Low fuel pressure will cause misfires. If pressure is good, it could still be an injector problem, like a clogged injector. If low pressure, suspect the fuel pump or the fuel filter.
For an ignition spark problem, check your spark plugs. Pull them out and inspect them for broken or cracked plugs, check the spark plug gap, check for oil fouled plugs. You may be able to isolate the misfire to a cylinder or two by the plugs condition. A misfiring plug or cylinder should show more black, sooty deposits than the other plugs. A normal firing plug will have a tan or brown colored insulator on the end with very little deposits. If the plugs are okay, clean them a bit if needed, and check for spark on the spark plug wire ends with engine cranking. Buy an inexpensive spark tester, or hold each spark plug wire metal end terminal 1/4 inch from a ground on the engine block, while cranking the engine. Wear a heavy glove to avoid getting shocked. Check that every cylinder is getting a strong blue spark to eliminate ignition as a problem. A weak, yellow or orange spark is an ignition problem, possibly a bad coil, or other ignition part.

If spark and gas is good, you may need to check engine compression. Any cylinder that has significantly lower compression than the other cylinders will cause a misfire, and set a misfire code. You should check for any trouble codes in the engine computer. A code reader or scanner would have to be connected to the diagnostic connector under the dash. What is "significantly lower" compression? About 15-20% less compression. Say you checked and had 150 psi compression in most cylinders. If one had 20% lower compression ( 150 X 20%= 30 psi, 150 -30 =120 psi, or same as saying 150 X 80%= 120 psi.), a condition like that can cause a misfire. I hope I have made sense here. Good luck, and post back what you find, or if any questions.

Apr 10, 2014 | 1998 Ford Windstar

1 Answer

94 jeep grand cherokee 4.0 at start when in drive stutters then cuts off restart its fine

Spark plugs worn,fouled or not gapped properly.Fault in the fuel or electrical systems.Faulty spark plug wires.Vacuum leaks at intake or hose connections.Uneven or low cylinder compression check compression.

Jun 03, 2013 | 1994 Jeep Grand Cherokee

1 Answer

1989 jeep cherokee wont fire has spark and fuel everything is hooked up right i dont no what to do anymore help me plz

If you have compression, spark at the right time, and fuel spray at the injectors, it should start.
The coil could be weak, the fuel pressure could be low, among other things.
Did it quit running, or just not start one day ? Have you checked the computer for trouble codes ?

Jul 29, 2012 | 1989 Jeep Cherokee

1 Answer

Need a wiring diagram for spark plugs for a 1995 jeep Cherokee sport

V6 engine: firing order: 1 2 3 4 5 6, distributor rotates clockwise. Left bank of engine (driver's side), cylinders 2, 4, 6 (#2 at front of engine). Right bank: 1, 3, 5 (#1 at front of engine).
Inline 6 engine: firing order is 1-5-3-6-2-4. Distributor rotates clockwise.
The number one tower on the dist. cap should have a mark or numeral 1 on it. If not, turn crankshaft to top dead center of compression stroke on number one cylinder, the 0 degrees or "T" mark on the crank pulley pointer. If you are on the compression stroke (not the exhaust stroke), the rotor under the dist. cap will be pointing to the number one cylinder spark plug wire tower.

Mar 30, 2012 | 1995 Jeep Cherokee

1 Answer

Loss of power when you give it gas

The repair manual trobleshooting recomend the followig steps: 1-Chech for faulty electrical or fuel system,2-faulty or incorrectly grapped spark plugs,3-faulty coil,4-brakes binding 5-incorrect fluid level on aut. transm.6-clutch slipping 7-fuel filter clogged or impurities on fuel system,8-make shure to fill the gas tank with the proper octane fuel,9-check for low or uneven cylinder compression (use a compression tester).. Hope this info. helps. sammyc47

Feb 24, 2011 | 1995 Jeep Grand Cherokee

1 Answer

I have a 1999 Grand Jeep Cherokee Laredo that has 200,000+ miles on it. I don't think the previous owner has ever changed yet alone cleaned the fuel injectors since she has had the jeep and past it to me....

Normally most of the cars are serviced for Maintenance Tune Ups, scheduled at 30K,60K,and 90K, and so on. If you have the maintenance records of this car, then is going to be easier for you to find out what part we are missing here. If the timing chain has been replaced, at 100K, now at 200K is the time to do it again. A wear out timing chain, is longer then a new one, so the engine is out of timing and this goes worse day by day. Not mention that if it broke, creates expensive damage to the engine. The timing chain cannot last forever.
If the engine doesn't run properly, the most important things to check are:
1. Fuel mixed with air in the correct proportion must be supplied to the engine cylinders;
2. Spark - there must be a strong spark at the proper moment to fire the air/fuel mixture.
3. Proper timing - the engine valves should open and close in appropriate time.
5. Compression - normal compression in the cylinders is 120 - 170 psi. The engine won't start if the compression is lower than 70 - 80 psi.
Regarding the fuel injectors, first check by listening for a clicking sound from each injector, then disconnect the wire of injector and connecting to a noid light and check for light pulse from the bulb.
If you are not sure disconnect the fuel injectors rail and crank the engine. a good injector will have a cone shaped spray. It is common for a fuel injector to be obstructed. You can clean fuel injectors In the car or Off the car. More information how to do this you can find at:

Oct 27, 2010 | 1999 Jeep Grand Cherokee

1 Answer

1989 Mistubishi Montero with rebuilt engine won't start.

You'll lneed to test for 3 things:
Spark at the plug
Fuel, making it to the cyliinder
Compression, above the minimum spec.

Sometimes when engines have been rebuilt, they have really poor compression as they try to start for a few minutes of cranking. If you have good oil pressure, check compression, if low add a tablespoon of oil to each cylinder to build compression, as soon as it starts it will begin to seat and seal itself, as well as provide ample lubrication.

For Fuel and Spark, just normal diagnostics, based upon your description, I won't mention doublechecking now that it has been cranked a bit.

WD40 can be sprayed into the intake while cranking to get one lubed a bit and to start to idle, it will stall when you stop spraying, indicating a shortage of fuel.

good luck

Feb 23, 2010 | 1989 Mitsubishi Montero

3 Answers

1999 jeep cherokee 6 cylinder engine light

2. Vacuum leak
3. Injector fault
4. High or low fuel pressure.
Thats the list of things to check.
This is a #3 cylinder misfire.
There is also TSB about #3 injector needing added heat protection. This could definitely be the cause. I start at plugs and go from there.
Hope this helps.
Thank you,

Dec 12, 2009 | 1999 Jeep Grand Cherokee

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