Question about 1998 Jeep Cherokee

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1998 jeep cherokee

I have a 1998 jeep cherokee 4.0 that will backfire thru the intake,i have changed the plugs,wires,cap and rotor but with no results

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Hi check your engines compressions it sounds like its a inlet vavle either burned seating or the valves settings on one of your inlet valves is incorrect if they are ok find out which clyinder is the problem and replace the injector or you could try the injector cleaners that you put in your tank yates210456

Posted on Oct 11, 2008

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What will cause a 1998 Jeep Grand Cherokee to stall out while driving and idling? We have replaced fuel screens, O-rings, idle air intake valve, coil, distributor cap and rotor, plugs, wires cam crank


Check the ground straps. From the battery to the engine. From the battery to the body, and the engine to the body. If you can't find one. Put it on.

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Code 12; Means the PCM sensed the battery was disconnected and after 50 key cycles, this code will disappear. Code 17; Means the engine is cold too long after start up. Engine coolant temp remains below normal operating range during vehicle travel. The thermostat is stuck open; replace the thermostat. Code 51; The O2 sensor stays below center voltage outout. And indicates a rich fuel condition. This is caused by the stuck open thermostat.

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Hi, My 96 jeep cherokee is running rough at idol and backfires. I replaced the fuel pump, plugs ,cap, rotor, intake air contorl mod.and wires. I cand seem to find egr. valve. can you please help?


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Firing order diagram for 1998 Jeep Cherokee Sport


1998 Jeep Cherokee 4WD 4.0L MFI 6cyl

To avoid confusion, tag and remove the spark plug wires one at a time, for replacement.
If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes to reflect how your engine is wired.

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Fig. 1: The firing order can usually be found cast onto the intake manifold

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Fig.: 1989-98 2.5L engine Engine firing order: 1-3-4-2 Distributor rotation: Clockwise

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Fig.: 2.8L engine Engine firing order: 1-2-3-4-5-6 Distributor rotation: Clockwise

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Fig.: 4.0L engine Engine firing order: 1-5-3-6-2-4 Distributor rotation: Clockwise

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Fig.: 5.2L and 5.9L engines Engine firing order: 1-8-4-3-6-5-7-2 Distributor rotation: Clockwise

Also, here can review the Jeep XJ Service Manual.

I hope help you with this, Good luck (remember rated this help).

Oct 13, 2009 | Jeep Cherokee Cars & Trucks

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1991 jeep cherokee laredo 4.ol


hi a droped valve could cause that problem thanks brian

Aug 12, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Backfire into intake


I'ts quite possible that your distributor is installed one tooth off and is too far advanced, causing the plug to fire before the intake valves are closed completely. Turn it one tooth counter-clockwise and try it again.

Mar 25, 2009 | 1998 Jeep Grand Cherokee

2 Answers

Engine will idle but backfires thru the exhaust and air box


are you certain that you have the ignition wires hooked up to the correct cylinders(153624 from front of engine back, #1 on cap 1st post past the lower cap screw, clockwise) That's the only thing I can think of that will give you misfire in both intake & exhaust. Cap & rotor are new?

Feb 09, 2009 | 1998 Jeep Cherokee

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