Question about 1987 Jeep Cherokee

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1987 Cherokee does not start - rolls only

I have replaced the alternator, ignition coil, ignition control module, crank position sensor - to no avail. What else could it be?

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Fuel- Do you hear the fuel pump kick on when you just turn the key to on?
Have you tried forcing some (ignitable) spray such as WD-40 into the intake? Is you gas gauge working ok?

Air- Any vacuum lines disconnected? Air filter in good shape?

Spark- did you pull the plugs to make sure you didn't have any serious build-up?

I'm not sure why you replaced some of the components you did. Alternators are to replaced when your battery is not receiving a charge while the engine is running. Crank position sensors tend to be a culprit when it takes more than one crank to start.

Posted on Jan 17, 2009

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You probably need a new starter

Posted on Jan 17, 2009

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Back to basics.. it turns over? starting system is ok... does it have fuel? does it have spark? is it getting air?....many many vacuum lines in that year model ..any many could be compromised...waft carb cleaner through intake to see if it lights up... check for spark if not .... then continue with compression test for engine internal health and timing issues... too many things to list here.... good luck adn avdive

Posted on Jan 17, 2009

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1 Answer

Where is the camshaft sensor on 2005 Colorado Z71 5 cyl


The cam sensor (which this engine has two of ) wouldn't think that was the problem . Maybe the crankshaft position sensor ,possibly ! Your problem could be caused by a lot of thing's , coolant sensor going bad ,.
Powertrain Control Module (PCM)
The powertrain control module (PCM) controls all ignition system functions, and constantly corrects the spark timing. The PCM monitors information from various sensor inputs that include the following:
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During normal operation, the powertrain control module (PCM) controls all ignition functions. If either the crankshaft position (CKP) or the camshaft position (CMP) sensor signal is lost, the engine will continue to run because the PCM will default to a limp-home mode using the remaining sensor input. Each coil is internally protected against damage from excessive voltage. If one or more coils were to fail in this manner, a misfiring condition would result. DTCs are available to accurately diagnose the ignition system with a scan tool.
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Replaced cps,distributer(cap,rotor,cam position sensor)checked coil good still no spark,replaced coil wire and plugs is the computer next?ignition control module is in the pcm i think


If the check engine light does NOT come on when cranking at the times when it won't start, then your ECU is in need of repair. The engine will only start after the check engine light comes on and the ecu is what controls that. It's likely going bad, causing the delayed start problem typical of early 90's jeeps. Repair or replacement services for your jeep ECU are available on ebay.

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The ignition engine speed sensor input signal to Powertrain Control Module (PCM) or Electronic Control Module (ECM) is continuously monitored. The test fails when the signal indicates that 2 successive erratic profile ignition pickup (PIP) pulses occurred.

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The P0320 code is triggered when 2 successive erratic PIP pulses are detected.

Possible Causes:
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Possible Solutions:
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1 Answer

Wont start and getting no spark


If the charging system is not putting out the required voltage, is it the alternator or the regulator? Full fielding the alternator to bypass the regulator should tell you if it is working correctly. Or, take the alternator to a parts store and have it bench tested. If the charging voltage goes up when the regulator is bypassed, the problem is the regulator (or the engine computer in the case of computer-regulated systems). If there is no change in output voltage, the alternator is the culprit.

When the engine cranks normally but won't start, you need to check ignition, fuel and compression. Ignition is easy enough to check with a spark tester or by positioning a plug wire near a good ground. No spark? The most likely causes would be a failed ignition module, distributor pickup or crankshaft position (CKP) sensor.

A tool such as an Ignition System Simulator can speed the diagnosis by quickly telling you if the ignition module and coil are capable of producing a spark with a simulated timing input signal. If the simulated signal generates a spark, the problem is a bad distributor pickup or crankshaft position sensor. No spark would point to a bad module or coil. Measuring ignition coil primary and secondary resistance can rule out that component as the culprit.

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2 Answers

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I would be thinking that there is a good chance that you need to be checking out replacing the computer, if you aren't getting any communication with the proper scan tool then the computer isn't communicating with anything in the vehicle...... I would have guessed first off that the ignition control module might be bad but that is obviously part of the computer also, I would be looking in that direction.

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