Guys and Gals,
This is my 4th TJ to own and all of which are 4.0L.
Now this is also my first 4.0L to whistle around 1700-2300 under load(normal driving conditions).
I can actuate the "hiss/whistle" by pressing slightly on the accelerator, any speed, just again at 17-2300. The engine does not necessarily have to increase in RPM's, but more air/gas is flowing into the engine.
Any thoughts?
Thanks, P
Interesting....Thanks...I'll start out looking there...I was thinking almost obstruction in intake or gasket issue..........Done it since day one, and no codes, but I'm going to check all of the lines. Just a hassle to take it to the dealer....
Thanks for the thoughts.
Patrick
accelerator,
Clean the throttle body and idle air passage.
That's intake whistle. Don't have one of those airswirlythingys on there? That's the only thing they do well.. Make noise that is. ;)
To check for leaks: Start engine Spray some TB cleaner around the base of the TB, and intake rail, hoses, etc. (just keep it off the paint)
If the engine stammers you have found the leak.
If the leak is from the TB base. Do not (DO NOT) crank on the bolts to tighten it down, that will only warp the base. You will need to check the base for level, resand if not flat, and put in a new gasket. Bolts only go to 9 ft.lbs.
The backyard fix for a TB that isn't flat. Start with 200 grit sandpaper and a flat surface (countertop etc) set the paper down and do a figure 8 with the tb on the paper.. switch to 400 then 800 as it gets flat. Can't do this too many times.
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