My 1992 Jeep 4.0 automatic wont shift into drive and overdrive.
It seems fine going around 25 mph to 35 mph but when I get to a hill or try to go higher than this there is no power and also there is a noise in the vicinity of behind the passenger glove box. Any suggestions would be helpful. Thank you Heidi
Re: My 1992 Jeep 4.0 automatic wont shift into drive and...
Alot of transmissions run a small vaccum shifter. IF you are up to it, crawl under the jeep and look at the side of the tranny (should be the right side of the car, right above the tranny pan you will see it. its only 2-3 inches in diameter There is also a vacuum line running to it about 1/8th inch rubber line. Its either off or broke near the vacuum shifter.
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Depends if you have a regular 3 speed automatic, or a 3 speed with overdrive. Put it in drive, it will start out in first gear, then shift into second at about 15 MPH, into third at about 30-35 MPH. With overdrive, fourth gear will kick in at about 45-55MPH.
You will loose 1 or 2 COP Ignition Coils
a year,not at one time though
The EGR Valve will fail,you can unplug the vacuum
hoses,plug them & drive up a hill to test that
All your testing will be done hot & around 35 mph &
on a slight curve where your off & on the gas & up &
For ignition issues drop down to 25 mph approaching
a hill & try easing up it increasing very slowly on gas
& the coils will misfire & set a PO300 Codes
At 100,000 miles you replace the front 2 (only)
O2 Sensors,as they get slow on the switching counts
New ones will make your car seem new again & instant
throttle response. Only the front sensors,leave the rear
monitor sensors alone,they stay
The Spark Plugs are special to the LS & get replaced every 3 years
not over 60 to 70,000 miles.
Have to use premium gas,or you get a knock,
you can not adjust out
I think this uses a fluid filled thermally controlled clutch. When the engine is cold, (and OFF), you should be able to move the fan easily by hand. Once the engine has warmed up to normal temp, park it, shut off the engine, and again try to move the fan. It should be very firm compared to when cold. (Don't push too hard on it, you can bend the blades.)
A bad fan clutch usually shows up as overheating during idle and stop-and-go driving, however. At a steady speed of above about 35 MPH, you don't need the fan. So if you are going up the hills at more than 35 MPH, I'd suspect the radiator might be somewhat plugged. You can try having it pressure flushed (that might help) but if not, you might have to replace the radiator. Try to get a higher capacity (more cores) radiator.
It will shift out of overdrive upon increasing throttle , pulling hills and so on. Your overdrive probably kicks in around 35 to 45mph and kicks back out as you increase throttle. Electrically controled speed sensor to control the response. Overwise the engine would bog down to a stall. Over drive is just that. It changes the gearing ratio to over drive meaning less then final gear 4 to 1 down to 4 to 3 etc more direct drive ratio to lessen consumtion of fuel with less stress on engine. Have shift speed sensor adjusted. Don't drive in overdrive in city if most driving is under 45mph