Question about 1993 Jeep Grand Cherokee

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Check engine light on

I have a 1993 Jeep Grand Cherokee that wont start is a in line 6 ,4.0 liter it turns over but doenst get fuel to the engine have repalced the distributer cap and rotor and spark plugs and the coil but it still doesnt start any Ideas.

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Maybe you must make an AutoDiagnostic or AutoScan and check the Fail Code.

Move the contact key (dont strat) ON / OFF / ON / OFF / ON...
and check the odometer flashes.
Two flashes is 2, one flash is 1, the code is 21.
55 is the last code that you read it, and is END of Diagnostic.

Good luck.

Posted on Aug 12, 2008

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You need to step back and consider the basics. The number one rule is fuel and spark, you got those you got go. This assumes that the enginer mechanical integrity is intact.

OK, Have you pulled a plug and got compression - just put your thumb over the hole and have some one crank, you'll know right a way and at least means part of the engine is OK.

Next, you replaced a bunch of electrical things, have you tried to draw a spark off a plug. A couple methods, pull a plug, ground the case, crank the engine and see if you can get a spark. This will be very evident especially at night time. Another method is to use a screw driver and pull a spark to a grounded surface in the engine. Be careful, a shock is actually shocking.

Fuel, what type system do you have, carb or fuel injection? With fuel injection you can loosen a fuel rail and see if you have pressure and fuel. Possible problems could be fuel pump and/or the pressure regulator on the end of the rail. On a carbed system, you could have a bad float or no fuel in the bowl. On check is to throw a little fuel down the carb air intake or use a small amoung of starter fluid. Does that help? Then you know if fuel is the problem.

Let me know what you find.

Posted on Jun 26, 2008


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Back up a minute...Do you have spark from the coil wire? (juice from coil) If so, change or check rotor and cap (wires do not all go bad at same time so unless they are wet, likely at least good enough to start engine)

Mar 05, 2009 | 1993 Jeep Grand Cherokee

1 Answer


OK...I have a 93 diagram I have shows an ignition module next to coil...but there is none on mine, (4.0 engine)
Two items to check are crank sensor and cam sensor inside distributor. Test procedure can be found in just about any manual including haynes.
You will need a decent volt/ohm meter to do testing. You can also check codes by turning ignition switch on/off three times, leaving it on the third time. Check engine will flash code #'s (ex: one flash, pause two flashes= the number twelve.then followed by a longer pause then another set of flashes etc.)

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