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I have a 1990 jeek cherokee 4.0l automatic, while driving it's always shifting down and then back up and at times it almost feels like the transmission is slipping does any one know what could cause this thamks
Re: I have a 1990 jeek cherokee 4.0l automatic, while...
Check the tps(throttle position sensor)located on the right front of the throttle body.if its out of adjustment or going bad it will mimic a trans problem.
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The flashing s light means a transmission problem. The transmission computer is under the carpet on passenger side under where you put your feet. Pull down the carpet to see the diagnostic light. Turn on the key to count the flashes to get the code. Pulll a list of codes from the internet.
If your trans shifts properly if you manually shift it thru the gears, going from D1, D2 D3 but feels like it is starting in second when in drive at a stop, the computer is probably the issue, and can be repaired or exchanged for a good computer, lots of companies do this ,find 1 on the internet.
hey there, artismo here! I have a similar problem with the idle fluctuating, and the trans down shifting itself at light throttle, which is the lock-up in the converter getting the wrong signal ? from the ECM.
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
Check fluid level first. The throttle position sensor could be faulty or misadjusted.It should be .4 - .5 volts when fully closed and 4.0 volts wide open throttle.
Next check line pressure. Line pressure at idle in drive should be 61 - 67psi.
If the line pressure is ok it will be an internal problem.
When was the last time you open the transmission ? Is it a standard, or automatic transmission ? When was the last time you change your breaks ? Jack the wehicle up, and try to turn the tires with your hand. your breaks might be too tight.
You cannot drive with different size tires front and back, especially with full time 4x4's the tires travel different distances when rolling.. a one inch height difference translates to a three inch rolling difference...ten turns of the tire = a thirty inch difference in distance traveled between the front and rear of the vehicle..being all attached to the same point (the transfer case) there is no way to compensate, therefore something must fail or the vehicle will stop in a locked up (bound up) condition. The weak link is the viscous coupler in the transfer case...likely what has failed.
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