12-15-2010, 11:56 PM
Join Date: Mar 2010
Location: Dubai UAE
Loss of Power
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!
Gavin, the desert rat in Dubai.