Idles fine...Won't accelerate! Help!? -
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Unread 02-01-2002, 12:36 PM   #1
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Idles fine...Won't accelerate! Help!?

I've got a '91 YJ Islander, 4-cyl, 5 speed.
Has been running fine, but all of a sudden I go to start it and I can't get over 25km/h.
The only thing I can think of that I did differently is that I put fuel injector cleaner into the fuel in the last fill...but that was 140km ago.
Also there is a hissing/grinding? sound comming from the exaust pipe area. Seems to get louder when reving the engine.
The acceleration problem happens whether moving or in neutral. Last night it took me an hour to drive home about 5 blocks! Had to keep reving then letting out the clutch.

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Unread 02-01-2002, 05:49 PM   #2
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1994 YJ Wrangler 
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Sounds very much like a heavily-damaged catalytic converter...
[b]'94 YJ Sahara Hardtop[/b]
4.0L / AX-15 / Stock NP231 / Stock D30 (open) / D60 (35-spline, Detroit locker, Moser axles) / rear disc brakes / 4.56 gears / Advanced Adapters SYE & CV Shaft / 33" BFG MT-KM's / Thorley Header / Magnaflow Muffler / BesTop Flares
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Unread 02-02-2002, 05:23 AM   #3
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I'm no expert but I definetly agree with Nightclaw.
2005 LJ Impact Orange 4.0L Automatic (Tigger) - new ride
1991 YJ Sahara 4.0L Automatic
1978 Dodge Lil Red Express - work in progress
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Unread 02-02-2002, 07:41 AM   #4
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I'll agree too.. sounds like that hiss is high pressure exhaust gas trying to bypass the rest of the exhaust system..
'92 YJ, 4.0L, rs5000, bds 2", 30" for now.
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Unread 02-02-2002, 10:40 AM   #5
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wrong, wrong, wrong. A small cat has climbed into your engine via the exhaust pipe. The engine noise and heat is pissing him off, thus the hissing. I suggest laying a trail of kitty treats from the exhaust straight into your big loving arms, you old bully.
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Unread 02-02-2002, 06:57 PM   #6
Matt Bodnar
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[ " The acceleration problem happens whether moving or in neutral."]

ok,...I see how it can be hard to accelerate in neutral.
but honestly i had a prob like that and it was due to a faulty Ignition Control Module,..but then again that is for a 88 carbed 258,
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Unread 02-02-2002, 09:52 PM   #7
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Definitely a catalytic converter problem. Most likely the inner material has broken up and clogged the pipe.
It's a jeep thing, I do understand!! 89 YJ Laredo,4.2L carburated. Chrome bumpers and grill. 31 AT's on 9x15 chrome modulars. Mustang GT buckets. 3" body lift and 1 1/2" shackle lift. Completely emission & computer free. Runs great!! Took the shackle lift out, they suck!!
Soon to be SOA with 35's
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Unread 02-04-2002, 01:49 PM   #8
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I have the same problem with my 1994 YJ 4cyl. However I don't have the hissing problem, just the acceleration problem. I replaced the Ignition control module, but that didn't solve the problem. The only other option was that the ECU was at comes in today, so hopefully that will solve my problem...

Based on the fact that yours has the hissing sound, I'd go for the catalytic conv. over the ECU though.
1994 YJ, 2" body lift, 33" BFG's, 4-banger.
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Unread 02-04-2002, 03:22 PM   #9
Dan Morera
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the distributor's platinum??
YJ Sahara 88, 258 I6, BA/10
2.5" Susp. Lift (Aprox.), 1" Shackles 31x10.5" Cooper
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Unread 02-04-2002, 07:29 PM   #10
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I had a similar problem with my 94 yj. Acceleration was bad and the jeep rumbled. I had bad fuel injectors and got a new one and got the other 3 cleaned and a new fuel line. It was all rusted out. If this is the case, fuel injector cleaner wont help until after u get them cleaned or replaced. Runs fine now except for at high speeds I need to look into that problem.
'94 YJ 4cyl. 5-Speed, Stock but not for long.
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