Question about 1991 Jeep Comanche

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1989 Jeep Comanche 2.5 throttle body 183,000 miles. Won't start.suspect not getting gas. History - Recent tune-up, oxygen sensor, crank angle sensor within the last 30,000 miles. Changed out water pump also, and all hoses. Fine one day....as in weekend fishing trip of over 600 miles. Tried carb cleaner: yep she rumbles! Got it going the longest about 1 minute and died. This is after the fuel filter change out. Yes I have it in right (out toward engine). Noticed some verbage in my chilton's about "make sure gas tank vents are clear) Where are they? Gas cap is a few months old. Did try with cap removed. Nada. Had it since it was new, done most of the work on it myself. Been real dependable. I am stumped!!! Any ideas? Tim in San Diego

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  • Richard Scordino May 11, 2010

    check fuel pump, fp relay, auto shutdown relay and fuel pump resistor.?

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Posted on Jan 02, 2017

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dr_layinlow
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SOURCE: Jeep won;t start..new fuel pump installed

try the fuel filter and make sure you have proper oil pressure!! Remeber if you have tried craking to many bad times then the plugs are going to be fouled out!! Means that they are going to be drowned with gas and need replacing!! Also make sure your fuel pump is coming on!! You should hear a hissin or a hummin noise back from the fuel tank!

Posted on Dec 10, 2008

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SOURCE: 96 Jeep Cherokee stall then hard/no start

change fule filter if nothing changes do fule pressure test

Posted on Feb 11, 2009

66 chrgr
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SOURCE: my 1997 jeep grand cherokee cuts off while driving or wont crank

the crank sensor can be bought at a autozone napa ect . but it is not very easy to replace unless you can get under the jeep!

Posted on Jun 11, 2009

pippall
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SOURCE: engine stalls occasionally even with new ignition system

The powdery black substance tells me that your egr valve is not working.And that is operated by the vacum sysem.The pipe has probebly come of the EGR valve.

Posted on Jul 18, 2009

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SOURCE: bad coolant sensor flashes - stalls or loses power 4.0 engine

sounds like you map sensor has gone bade that will cause it to run bad till it warms up is you cheack engine light on

Posted on Aug 17, 2009

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1 Answer

89 Jeep Comanche cranks, but has no spark


no spark to all 6 cylinders, or just 2 ????????????????????????
did you check all fuses first??????????
did you check that the CEL lamp glows, key on? MIL lamp?
if not? the main is dead, or fuse dead.(blown)
ok this is the very very old and obscure Jeep Bendix/Renix system.
the hard part is , it is NOT OBD1 engine yet, making diagnosis very hard. and no distributor. (new for MPI)


is yours the 4.0 I-6
and is it the 1 year, MPI engine? WITH MAF SENSOR!!
this is and AIR DENSITY SYSTEM unlike most other jeeps.
1989 - Changed to Renix MPFI. (read 4 injectors now>....)
i owned a 88 Comanche, love it. 200,k miles i drove from 0
other that ISC motor, zero issues. mine was TBI , no MAF.
NO spark.,?
this MPI has a coil pack with 3 coils in side, and uses the famous.
wasted spark design, even my new jeep v6 has this.
the coil is driven by a separate ICM , ignition control module.
The ICM, iis driven by the PCM(ECU)

your car has a CKP sensor (crank) fitted to the BELL
for the 3 marks, on the flywheel
quote FSM.
The Crankshaft Position Sensor (CKP) is secured by special shouldered bolts to the flywheel/drive plate housing. It is preset in its mounting at the factory and is non-adjustable in the field.
uq:
this means it tunes like a marconi radio, its not a hall sensor...!!!
its just a coil with weak outputs.
is it loose?
id do not know where the CAm CMP sensor is.
the online books mix 5 systems bad, this engine was EFI was
a one year only system. (French)
My wild guess is the CMP is this funny device, on the right
side of engine, where the DIZZY USED to be. called the cam sensor.
that too, must work and i think its a hall sensor and is very easy to test.
sadly no OBD1 and no CEL: flash codes.
to blink out, CMP/CKP dead. cranking
just very old factory scan tool works

again, all spark dead or only 2?

Mar 29, 2014 | 1989 Jeep Comanche

1 Answer

I have an 04 pt cruiser 2.4 non turbo replaced idle air control valve, computer, fuel pump/strainer,crank position sensor, intake air temp sensor,spark plug/wires, timing belt, oil pressure switch both...


try finding a mechanic with an old style oscilliscope tune machine so you can actually see what the mixtures and spark are like running i suspect cam or crank angle sensors

Nov 09, 2013 | Cars & Trucks

1 Answer

1987 jeep comanche will stay runnning only when spraying carburetor cleaner in carburetor or when you pump throttle rapidly


Hello
It sounds like a glogged fuel filter or throttle body problem. Disconnect gas line at carb get a small jar or can to catch gas, hold gas line in jar and have someone crank engine, If you have good gas flow to carb then Its a throtle body problem, (Throtle body and carb are same thing just in case you did not know)could be electrical or mechanical problem at throttle body, Its usually electrical, fuel flow meter. Hope this helps

Oct 23, 2012 | 1987 Jeep Comanche

1 Answer

Have a 89 jeep Comanche starts but won't stay


If is fuel injected try checking the fuel regulator and if is has a carburetor possible bad choke or needle seat / worse case jump timing

Dec 19, 2011 | 2006 AMC Comanche

1 Answer

1987 jeep comanche with4.0 will crank but wont idle i have already changed tps and idle air control valve and checked fuel pump and changed fuel filter and checked vacume lines with no change what else...


have you checked the crank position sensor? when this baby goes the engine will start and run for one or two seconds then die like its out of gas.

Also the ignition switch may be suspect.

Oct 14, 2010 | 1987 Jeep Comanche

1 Answer

1988 jeep comanche idles high. have checked vacuum hoses. what could be causing this?


You might try adjusting the idle at the throttle body, check the mass airflow sensor, and check for leaks around the plenium.- or what some people still refer to as the intake. And, check the condition of the fuel rail and injectors.

Jul 25, 2010 | 1989 Jeep Comanche

2 Answers

The car won't stay on without giving it gas


Jeep Cherokee Limited Crank, No Start
Q. Hi! The Jeep has periods when it will not start for a couple days (cranks fine but won't fire), then it will mysteriously start again. A friend suggested that it may be the CPS - I checked it has 200 oM - when I'm cranking by hand it's little bit changing - it should be OK. But again, wouldn't this also effect the engine during those times that it was running?
mechanic.jpg This problem occurs during rainy and sunny weather so I don't think it's a moisture or water intrusion problem. Is there any part of the ignition system that only affects starting that could be causing this problem?
  • 1989 Jeep Cherokee Limited
  • 4.0 liter
  • Automatic transmission
  • 170,000 miles
I found some forum where some guy had the same:
"I am having the same or similar problem with my wifes 1990 Cherokee. I have found a place that tests the ICM. It may take a while to find a place in your area. I suggest you go in person and talk to the people in your better parts stores.
I have been unsuccessful so far in finding the fault. My ICM has been tested twice and passed both times. I have power to the ICM and the coil checks within parameters. This has been a very frustrating problem for me. I'm about ready to drive it off a cliff and call it a day. Good luck."

So my question is; what is the reason of that? Thanks for help...
Pawel
A. This was a widespread problem for Chrysler and they issued a couple of TSBs to address the problem. The first was:
Models:
1989 MJ & XJ Bodies
Subject:
4.0L No-Start, Hard Restart, or Engine Die-Out. Vehicles Equipped With Automatic Transmission Only.
Index:
DRIVEABILITY
Date: December 29, 1989 No.: 18-57-89 (C18-23-9) P-14 Body Code Legend:
MJ - COMANCHE (RWD, 4WD) XJ - CHEROKEE/WAGONEER (RWD, 4WD)
SYMPTOM/CONDITION:
Some 1989 vehicles equipped with the 4.0L engine and automatic transmission may experience an engine no-start, hard restart, or an engine die-out. This condition may be caused by low signal strength from the crank position sensor due to a larger than desired distance to the flywheel sensing ring.
DIAGNOSIS:
42257289.gif Check to see if the vehicle has a slotted crank position sensor:
  1. If the vehicle is equipped with a slotted crank position sensor (see Figure 1), check to see if the CPS grommet on the top of the transmission bell housing has been updated (see Figure 2). If the CPS grommet has not been updated, replace the CPS grommet per the Repair Procedure outlined below.
If the vehicle has a slotted crank position sensor and new CPS grommet, do not install a new sensor, but reinstall the slotted sensor that was on the vehicle and verify that it is good using procedures in the 1989 Jeep Service Manual 81-370-9045 on page 14-87.
  1. If the vehicle does not have a slotted crank position sensor already installed, then proceed with the Repair Procedure.
PARTS REQUIRED:
1 Crank Position Sensor (slotted) P/N 83100067 1 Crank Position Sensor Grommet P/N 83100068 REPAIR PROCEDURE:
  1. Turn the ignition switch to the "OFF" position.
  2. Disconnect the Crank Position Sensor (CPS) from the engine harness.
  3. Raise the vehicle using a lift.
  4. Remove the old CPS and grommet.
  5. Install the new CPS grommet.
NOTE: THE NEW CPS GROMMET MUST BE REPLACED SO THAT THE MAXIMUM SIGNAL OUTPUT CAN BE OBTAINED FROM THE NEW CRANK POSITION SENSOR.
  1. Install the new Crank Position Sensor and loosely attach the retaining bolts.
  2. Firmly press down on the slotted hole side of the CPS until it bottoms on the machined lip of the bellhousing. While holding the CPS down against the bellhousing, tighten the bolt on the slotted side of the CPS to 16 ft.lbs.
  3. Tighten the remaining attaching bolt to 16 ft.lbs.
NOTE: MAKE CERTAIN THAT THE CRANK POSITION SENSOR IS COMPLETELY BOTTOMED ON THE MACHINED LIP OF THE BELLHOUSING AND IS AS CLOSE AS POSSIBLE TO THE FLYWHEEL SENSING RING WITHOUT CONTACTING IT.
  1. Secure the lead of the CPS to the retaining clip on the bellhousing to prevent its contact with the exhaust manifold.
  2. Lower the vehicle.
  3. Connect the CPS to the engine harness.
If this repair has been made, or hasn't fixed the problem, the other TSB is 18-54-89 REVISION A recommending cleaning of the throttle body assembly, DIY: Cleaning Throttle Bodies, and replacement of the PCM.
PARTS REQUIRED:
1 ECU (Automatic Transmission) P/N 53007842 1 ECU (Manual Transmission) P/N 53007843 1 Mopar Choke and Linkage Cleaner P/N 4549619

Dec 03, 2009 | 1996 Jeep Cherokee

1 Answer

Where is the fuel pump regulator located, the truck starts but wont stay running


If you have a throttle body injection it's on the throttle body. If you have port injection, it's on the end of the fuel rail.

Jun 27, 2009 | 1989 Jeep Comanche

1 Answer

1989 jeep wrangler wont start it was running today for a while


Check the carb out sounds like its pushing to much fuel in butterfly could be stuck or choke on constant any warning lights on the dash i.e. engine managment light this could be the lambor sensor in the cat if this sensor has gone then it could be telling the fuel system to push more fuel in.

Apr 22, 2009 | 1989 Jeep Wrangler

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