Question about Jeep Grand Cherokee

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91 cherokee spark problem

I have a 91 cherokee and when I test for spark I only have spark on cylinder 3 and 4. I have replaced the crank position sensor, alternator, and have tested with another coil. Can I remove the icu and take it to a dealer to get tested or do I have to tow it in?
Is there something else I can check before I do this? Thanks for any help!

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These vehicles have had some problems with distributors. Open the distributor and look for signs of arcing. An intermittently interrupted spark could cause a stumble or hesitation as well. Distributors also can behave differently when hot

Posted on May 14, 2008

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4 Answers

I have a 95 grand Cherokee. I'm getting fuel, and I'm getting spark. I replaced the crankshaft position sensor, and it still wont start. I spray starting fluid in carb, it starts and dies. Please help


what does getting mean? which engine, 4Liter or 5.2 or what?
spark at all cylinders is getting and timed right?
runs on test fuel so sparks good, that means fuel is bad
or flooding or too little fuel.
code 12 cranking for 5 seconds, means sensors are ok.
why replace parts that make spark when sparks good, it run on test fuel, why worry spark.? and not just fueling.?

now lets do fuel, step one is fuel pressure, not squirt tests.or dribble test. a real tool called,a fuel pressure gauge that works, and nothing else, (unless rail is dry and now we know its not)

if all spark plug tips are dry, are they?
then its not injecting, (the ECU can cut injection for 2 reasons) ask
or there is no real pressure.
so we open the FSM and read page FUELING
49psi is idle pressure, (more cranking with so little vacuum)

the tests are all there,

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

Jan 30, 2015 | 1995 Jeep Grand Cherokee

2 Answers

How to check a ignition coil pack to see if its good,


the coil does not crank the engine , the starter does that, sorry.
(if you ever had to hand or foot crank and engine , youd under stand that. (like motor cycles or boat engines, or per 30s cars.)

in fact will crank all day with no spark parts on car..

x2, the scan tool does tell you why there is NO STARTS, CRANKS OK. The pcm can detect, one missfire in 10 cmp;ckp signals.
  • CRANK FOR 5 SECONDS
  • release, key
  • scan tool has DTC errors?, read the believe them.
no engine stated of 4 or more,

U checked everything but spark,
why, check spark at all cylinders, all most fire or the engine will not run or stall.
That test be first, if not starting (AFTER SCAN TEST)

IF NO spark fuses are next , not last.
lets do no start fails tests. (cranks perfectly 200 to 300 rpm)
  1. : check fuses
  2. key on, CEL lamp must glow, if not , ECU fuse blown.
  3. crank with scan tool , see P03xx DTC errors, see RPM dead.?
  4. check for spark? got spark x4 or times number of cylinders?
  5. got spark try test fuel now, runs for 3 seconds?
  6. yes, runs on test fuel now means lost fueling
  7. no, dont run on test fuel, means, 1 to 5 done wrong above or engine compression bad.
  8. bad fueling, huge number of tests. check fuel pressure now.
confused, try a shop and watch them, learn.

Jan 12, 2015 | 2005 Suzuki Forenza

1 Answer

I changed the distributer in my 1994 jeep grand Cherokee and Shiite will not fire


cranks ok but will not start,
so no spark, right> (and actual test not guessing)
all spark plugs, dead each fails for spark, or just 1 or 2????
using a fresh test spark plug, case grounded?
behold i see dead spark at all cylinders example.
1: check all fuse first (always)
2: key on, CEL must glow, if not fix that first.
3: i insert the diagnostic jumper and key on and the CEL flashes codes.
4: I crank engine for 5 seconds,
5: i release key not off
6: i look at my CEL, it flashes and tell is if CMP or CKP are dead
via there own unique codes.
i bet now , you are on track.

Jan 10, 2014 | 1994 Jeep Grand Cherokee

1 Answer

91 Cherokee will crank but won't fire. Replaced


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

Dec 03, 2012 | Cars & Trucks

1 Answer

My 91 eagle talon won't get a spark it just cranks


try crank position sensor.cam sensors are mostly for monitoring misfires. cam sensor doesnt determine spark timing

Dec 17, 2011 | 1991 Eagle Talon

2 Answers

How to replace spark plugs on 2000 jeep cherokee classic 6 cyl.? Also does 2000 cherokee have inline fuel filter?


TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.

Jul 20, 2010 | 2000 Jeep Grand Cherokee

3 Answers

1999 jeep cherokee 6 cylinder engine light


1.Plugs
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,
Lee

Dec 12, 2009 | 1999 Jeep Grand Cherokee

1 Answer

No spark. Have a '91 S-10 4.3L. Drove to work,


check crank position sensor, run scanner for trouble codes , some auto parts will do this for free

Sep 27, 2009 | 1991 Chevrolet S-10

2 Answers

91 jeep no spark


wd 40 your flywheel sensor plug

Sep 02, 2009 | 1996 Jeep Grand Cherokee

1 Answer

91 LEGACY STARTED RUNNING ROUGH


The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.

Mar 16, 2009 | 1991 Subaru Legacy

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