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Old 12-30-2011, 04:32 PM
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1984 CJ-7 won't start

I just got my cj on Wednesday. It's a 258 fuel injected. It ran last night fine. I parked and this morning went to turn it on and nothing. After work today I turned the key over and it starts then dies right away. Buy if I give it has I can keep it running but the exhaust is black and sounds rough. I'm not sure what to do. I have an appt on Tuesday at the place I bought for them to look at it. I'm worried it'll need to be towed there. Thanks for any help.
-derek
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Old 12-30-2011, 04:53 PM   #2
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What kind of fuel injection conversion is it? Black smoke could mean leaking injectors.

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Old 12-30-2011, 05:07 PM
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I'm not sure the place I bought it from just said fuel injected. On the back under the one tail light it says 4.2L fuel injected.
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Old 12-30-2011, 05:47 PM   #4
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Ok, the reason I'm asking is because the 4.2L (I've always heard it referred to by it's volume in inches, 258 btw) isn't fuel injected, it uses a carburetor. There's loads of different conversions you can do to make it fuel injected though, so I think finding out what you're using would be the first step if it is leaky injectors.
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Old 12-30-2011, 05:49 PM   #5
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Oh, also, you said when you give it gas you can keep it running, does it die when you let off the pedal?
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Old 12-30-2011, 05:58 PM   #6
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No CJs ever came from the factory with FI, so you'll first need to figure out what engine and injection system it actually has, and then diagnose from there.
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Old 12-30-2011, 07:18 PM
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How do I tell what engine an fuel injection system?
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Old 12-30-2011, 07:32 PM   #8
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A lot of people swap out small block chevy engines for the fuel injection, so look around for a chevy logo. Is it a Vsomething or inline (two heads or one)? Pictures of the engine bay would help.
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Old 12-30-2011, 07:36 PM
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Okay I'll try to get pics up in the am when it's light out. Thanks for the help!
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Old 02-07-2012, 09:45 PM   #10
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The 4.2 is carbed but computer controlled with a stepper motor on rear, been reading and they have a problem with idle tubes clogging causing fuel to spill over, simple fix just look it up or put a 4.0 in it.

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