Slow acceleration, no more that 2000 RPMS -1992 Wrangler 4.0 I6 -
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Go Back > General Technical Discussions > Engines & Drivetrain > Slow acceleration, no more that 2000 RPMS -1992 Wrangler 4.0 I6

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Unread 02-06-2014, 05:41 AM   #1
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1992 YJ Wrangler 
Join Date: Feb 2014
Location: Mesa, AZ
Posts: 1
Slow acceleration, no more that 2000 RPMS -1992 Wrangler 4.0 I6

Good morning!

I've been trying to troubleshoot my most recent Jeep acceleration etc. issue.

The Problem: Accelerates super slow, will barely push 2000 RPMs while in gear and but in Neutral will rev up just fine; Will not go over 40 MPH.

So Far: I've removed the exhuast/ CAT / O2 sensor that provided a little boost in acceleration in 1st and 2nd, but 3rd - 5th are still dead. I replaced the fuel filter & pump last year, and fuel delivery doesn't seem to be the issue.

Any suggestions?? This is (not) driving me crazy!! any help would be much appreciated, thank you !

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Unread 02-07-2014, 03:22 PM   #2
Red Rubicon
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2003 TJ Wrangler 
Join Date: Jun 2002
Location: Mt. Shasta, Ca
Posts: 130
If I understand your post correctly you have checked the exhaust and converter for obstructions. Have you checked the intake? I have found everything from shop towels to rats nests plugging up air intakes.
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