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Unread 06-02-2012, 11:47 PM   #1
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98 cherokee cranks but no start

I just put an engine and trans. in my friends cherokee. It cranks but doesn't start. Has spark and fuel at the fuel rail, but plugs are dry. I'm thinking the injectors aren't spraying. Any ideas? Rollover switch, or anything like that? Any ideas would be greatly appreciated. Thanks, Jason.

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Unread 06-03-2012, 09:25 AM   #2
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CJ7-Tim's Avatar
2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 23,727
Details required:
Vehicle year ?
Year of donor engine ?
Transmission ?
Year of donor transmission ?

Go back over the install, make sure everything is hooked up and hooked up correctly. The Crank Sensor and the Cam Sensor are the primary controls, are they correct, undamaged, and installed correctly ?

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Unread 06-03-2012, 09:34 AM   #3
It's the crank sensor!
tjwalker's Avatar
1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,665
Did you actually pull a plug and verify that you have spark?

With the swapping of the engine and transmission, the first thing for you to check is that the crankshaft position sensor is plugged in.

Driver's side of the bellhousing.

Without that input signal, you won't have spark and you won't have fuel going to the fuel injectors.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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Unread 06-03-2012, 09:40 AM   #4
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1998 XJ Cherokee 
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^What they said, but also, check the ASD circuit in the fuse/relay box under the hood. If I recall correctly, that will also prevent fuel delivery.
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cherokee , no start

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