2000 4.0 Wrangler Misfire - JeepForum.com
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post #1 of 1 Old 04-28-2010, 10:02 AM Thread Starter
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2002 TJ Wrangler 
Join Date: Nov 2004
Location: Gillette, WY
Posts: 1,281
2000 4.0 Wrangler Misfire

I have a consistent cylinder 1 misfire. It happened immediately after I started the Jeep a couple of weeks ago.

I used my spark tester, and found I do have good spark at cylinder 1.

I also checked to make sure my valvetrain was intact. And yes, it is.

I then checked the fuel system.

Using my stethescope, I realized that upon startup, the fuel injector will pulse normally. Then about 15 seconds into the runtime the injector will completely flatline. No movement whatsoever.

I tested the fuel injector, and it's resistance was comparable to the others, but I decided to replace it just in case. No change.

At idle injector #1 is getting around 5-6 volts, fluctuating as usual.


The last thing I want to do is bring it to the stealership,


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