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Old 12-15-2010, 11:56 PM   #1
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Loss of Power

Hi Guys,

please help me, I own a 1993 Wrangler 4.0L Manual.
The vehicle has done 91000Km's (roughly converted 40000Miles).

This past weekend my family and I went on a camping trip. Now being in the Middle East we flock to the beaches in the winter and stay home in the summers.
At the camp site we set up camp on top of a dune over looking the Indian Ocean- magical. Everytime we wanted to go of we used my vehicle to drive down the dune, swim and drive back up. the incline on this dune was not huge, I remember in the past going up some of these type of dunes in like 3 gear, no problem at all- but this time, this time required me to shift back to 1st gear and nail it. On doing this I noticed that the revs did not go past 4500Rpm, this is very strange to me, as I have done loads of dune bashing and often had to shift from 2nd to 1st to make the climb and the revs would exceed 4500. it was like something was "blocking" or hindering the revs to climb.

Recently I changed my air-filter to a sport air-filter, I had a increase in power, but after this trip I now have a "whistling" noise- sounds like a turbo or super charger. This noise is only heard when I hit around 2300 PM. I hear the sound coming from the right side of the engine which rules out manifold. I had encountered that the "breather pipe"that is on top of the engine and connects to the air-box has come loose a couple of times this affected the power, I have now tightened this with 2 clamps. Could there be a leak? Is there a airflow regulator?

On our way back from the camping weekend I noticed that my car is loosing power in 5th gear, and had to gear it back to 3rd to make the incline on a tar surface.. this is unlike Jeep and definitely unlike the Wrangler I bought a few month ago.
My friend also has a Wrangler, and due to a demo of his vehicle I set out and bought mine.. they are AWESOME vehicles and i have been involved in MANY reoveries of expensive Range Rovers, Fords,Toyota and Nissans.. I am yet to find a Jeep stuck here in the desert.

Guys & Gals, okay in a nutshell:

1) Revs are not picking up- does not exceed 4500RPM
2) Whistling sound
3) Looses power in the higher gears (5th)

What I am suspecting is:

1) Spark plugs- (There is a slight misfire on idle/ Hunt on idle speed)
2) Lead wires
3) Too much airflow to my engine (I recently changed to a sport filter- It now has a "Supercharger" sound at certain revs- NOT COOL). Airflow regulator broken?
4) Blocked fuel filter (? Not sure on this as the engine fires-up without a hitch- Unless it is HOT- 60C in the desert)


Please share you knowledge with me, I would be very grateful!

Thank you
Gavin, the desert rat in Dubai.

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Old 12-16-2010, 04:09 PM   #2
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Sounds like a clogged CAT

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Old 12-16-2010, 04:23 PM   #3
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could try changing the fuel filter, running in the sand ccan clog it. had a problem once with the mass air flow meter being dirty, usually you can clean it, just be careful not to break anything in there. As for the supercharger sound it could just be coming from the new filter. Mine made the same noice from the clutch after i installed a new aftermarket clutch and pressure plate but it went away after a while.
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Old 12-20-2010, 01:27 AM   #4
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Quote:
Originally Posted by Garyk View Post
Sounds like a clogged CAT
Thanks Gary- I tried looking on Youtube where the CAT is located but was unsuccessful. I guess I'll take it to a exhaust shop. I would like to have a new system fitted anyway.
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Old 12-20-2010, 01:33 AM   #5
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Quote:
Originally Posted by Mike_3303 View Post
could try changing the fuel filter, running in the sand ccan clog it. had a problem once with the mass air flow meter being dirty, usually you can clean it, just be careful not to break anything in there. As for the supercharger sound it could just be coming from the new filter. Mine made the same noice from the clutch after i installed a new aftermarket clutch and pressure plate but it went away after a while.
yeah, the plan is to take it for a service and get a GOOD once over. I found out that the engine is not firing on all cylinders- really annoying seeing other climb dunes.. but soon, I shall be up there leading the rest of the Japanese Models and kicking up some sand..

Thanks for the advise Mike.
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Old 12-23-2010, 05:30 PM   #6
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Thanks for the advise Mike.[/QUOTE]

not a problem, good luck with it and post some pics when you get some. Done have much sand here in northern illinois lol
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Old 12-26-2010, 11:07 PM   #7
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Quote:
Originally Posted by Mike_3303 View Post
Thanks for the advise Mike.
not a problem, good luck with it and post some pics when you get some. Done have much sand here in northern illinois lol[/QUOTE]

No Problem- I do hoever miss a "Normal" setting- some tress would be nice to see, not to mention grass.

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