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Old 03-24-2004, 03:20 AM   #1 (permalink)
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XJ want start

Ok guys this one has me stumped.
Ive got a 90 xj 4x4 with the 4.0 and auto in it. I baught it off a pbb member knowing that it didnt run due to running it in a mud hole.
The thing is I ve got fire and fuel going to it but it still does not hit a lick. Ive changed the cps on it, changed oil, and tripple checked the timing. It does have compresion and a pretty decent spark to the plugs. The guys that had it before me had swapped the computer, coil, and about everything else electrical inside the cab.
Is there something im missing? I figured since ive got fuel and fire and in time it should do something. Any help will be appreciated.
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Old 03-24-2004, 03:27 AM   #2 (permalink)
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Try holding the throttle about half way and try to start it........had this happen to me once, had spark and fuel, but no start. Held half way and it started anfer a few seconds.

Edit: it was on an 90 XJ too.
Hope that helps!
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Old 03-24-2004, 04:18 AM   #3 (permalink)
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Ive held it half open wide open and even sprayed starting fluid down the intake. Nothing. I have got a few random hits every once in a while but it is very weak.
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Old 03-24-2004, 11:06 AM   #4 (permalink)
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Come awn some one has to have some ideas?
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Old 03-24-2004, 12:01 PM   #5 (permalink)
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You've got fire (you said pretty good spark tho...blue kernel or yellow?) As I recall, a yellow spark is considered weak; it should be blue, but I don't remember exactly. I'm just throwing out ideas here!

You said you squirted starting fluid so that *should* eliminate any fuel delivery problems (meaning it if doesn't start on starting fluid, something else is amiss), so look to the spark/timing.
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Old 03-24-2004, 12:20 PM   #6 (permalink)
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Did you check the relays on the passenger side of the motor. Sometimes they can cause this. Also check under the coil and test out the control module there.
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Old 03-24-2004, 12:57 PM   #7 (permalink)
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The spark is definetly yellow but looks wide and strong. The timing is spot on so I know it hasnt jumped time. I have an extra distribitor or 2. Ill swap that out and maybe new plugs wouldnt hurt.
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Old 03-25-2004, 12:16 PM   #8 (permalink)
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Old 03-25-2004, 02:03 PM   #9 (permalink)
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Throw your timing light on the coil wire. It should get all strobe light on you. If it's not replace the coil or CPS.

Where is the compression at?
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