Engine sputters, bucks, - JeepForum.com
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Unread 04-11-2010, 09:16 AM   #1
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1991 YJ Wrangler 
Join Date: Jul 2008
Location: Boston, MA
Posts: 3,927
Engine sputters, bucks,

I've been dealing with this for a couple months now.

Shortly after starting the engine starts, it will begin to sputter and drop RPMs as if it was about to stall out, the RPMs will climb back and the idle will smooth out. It goes through this cycle on average maybe 3-4 times and then is fine for the remainder of my trip.

If I don't let have seizure time, It will do it while I'm accelerating in lower gears a few times and then run fine. When it happens while I'm driving, I will try to give it gas but it's as if it's not getting any more gas. After maybe 5-6 seconds of this, it will make a loud pop and everything will be fine. When it gets gas again, it get's a lot of gas and bucks pretty badly sometimes. I've gotten a bit used to it and I'm pretty quick on the clutch when it happens.

I replaced the fuel filter a couple weeks ago. I've searched this a bunch but it seems like nobody has the same symptoms so I come to you guys for help. I was thinking about replacing the oxygen sensor and cleaning out the throttle body, do you think it would help?

91 YJ
98 XJ
2 door love
The U.S. Army vaguely envisioned something bigger than a motorcycle, smaller than a truck, and undaunted by the most difficult terrain.
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Unread 04-11-2010, 11:29 AM   #2
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1991 YJ Wrangler 
Join Date: Nov 2008
Location: Elizabethtown, Ky.
Posts: 3,064
Check for codes.


MJM Powder Coating
Elizabethtown Ky.

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Unread 04-11-2010, 11:36 AM   #3
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1993 YJ Wrangler 
Join Date: Dec 2009
Location: Purcell, OK
Posts: 21
Check your fuel pressure tthe shrader valve on your fuel rail. Pressure should be 31 lbs and go up to 39 when you pull the vacuum line off the pressur regulator. When you stop the engine the pressure should slowly bleed down. This is the cheapest easiest way to diagnose your problem. The parts you chase on this problem can get expensive.
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Unread 04-11-2010, 11:49 AM   #4
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1995 YJ Wrangler 
Join Date: May 2009
Location: Charlotte
Posts: 322
Check out the TPS. I had a similar problem but mine would stall. The TPS would get very dirty because of blow by so I put a breather on the the CCV and its fine now. Also check your vaccum lines
[Originally posted by rulppa: But no, there is no change is power.. and my arse-dyno is pretty accurate]
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