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Old 09-23-2005, 02:16 PM
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rough idle problem

What's up everyone? My dad has a 94 jeep cherokee sport, inline 6 cylinder and he has been complaining of rough idle problems right before the engine blew. I replaced the engine for him and set the base timing last night but the engine still has a very lumpy idle. I checked the base timing with the timing light, I found the timing to be flickering between 26 to 20 degrees before 0. I redid the timing by finding tdc on #1 and yet the same result, not only that but the timing light doesnt give me a steady flicker it flickers and pauses in sync with the engine's missfiring. I removed the distributor cap and manually rotated the crankshaft watching the rotor rotate and as the timing mark on the crankshaft pulley reached 0 the rotor lines up with #1 on the cap which means mechanically the timing is set. I am lost any suggestions for troubleshooting would be nice the engine has a new cap,rotor, plugs and wires along with a new engine. It idles rough to the point where it wants to stall but then the idle picks up temporarily and prevents it from stalling.

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Old 09-23-2005, 02:59 PM
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Tune up kit

Doc here,

Looks like you have to go the tune up kit....

Not a cheap alternative... but then again that's Jeep...

You might try testing the voltages to the black box ignition and check it's grounds first..In fact run a separate ground from the box to the main grounding location on the block..

Be sure you have a constant 12 volts to the box and your Battery cables are clean and tight along with any secondary wires running to those cables..

Here is where you can get a tune up kit...(get ready for sticker shock..)

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