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Old 02-12-2011, 12:17 PM   #1
Join Date: Feb 2011
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Unhappy Power loss above 1/2 throttle, code 51

My 1995 2.5L YJ (165,000 miles) suddenly lost power above 1/2 throttle.
While climbing a hill the exhaust note changed (got deeper with a sound like a turbo bearing failing) and after about 2 minutes the check engine light came on and stayed on until the engine was shut down.

I noticed that there was also a loud exhaust rattle at idle and above half throttle there is a whistling/turbo bearing noise (the engine in non-turbo) after this started.

Engine codes were set and they are:
12 - (Battery had been disconnected)
33 - (A/C clutch - no A/C on this vehicle)
51 - (running lean)
55 - (end of diagnostics)

I've replaced the Fuel Filter.
Fuel Pressure is 35 psi running; 37 psi key on, engine off.

Power is OK up to about 2,500 RPM or 1/2 throttle. Above this there is rapid power loss . When throttle is let up to under 1/2 power is restored if the RPM is under 2,500

Any suggestions as to the problem?

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Old 02-12-2011, 03:28 PM   #2
Join Date: Feb 2011
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Thumbs up Problem Solved

Fixed! Problem was the Catalytic Converter.
The guy at the muffler shop said it was good that I didn't push the engine too hard or long as the result of that is a blown head gasket from the high back pressure and temperature.


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Old 02-12-2011, 04:26 PM   #3
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Join Date: Nov 2010
Location: NE corner of Iowa
Posts: 1,708
I was gonna suggest that......but you beat me to it..... )
"For Gawd's sake, put a RELAY in there or you could burn the whole damn Jeep to the ground" ...this quote brought to you by people who do not understand the law.....Kirchoff's, Ohm's, or Faraday's.
Violation of KISS shall always ring false in TRUE engineering. - ME___
Had 75CJ5, 89YJ, 93YJ. Have 82CJ7 & 95YJ____Not one burnt yet due to lack of relays.
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code 51 , exhaust rattle , power loss

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