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Why does the idle increase about 400 RPM when putting transmission in reverse or drive 1990 F 150 5.0?
Wiki User
∙ 12y ago
Many vehicles have an idle speed compensation mechanisim.
With a carburated engine this is usually a solenoid that opens the throttle enough so that the idle speed does not drop when the transmission is put in gear. If this is a carburated engine this can be adjusted. If you get a lurch when the truck is put in gear then it should be "fixed". If there is not a lurch then I'd leave well enough alone.
If this engine is fuel injected the same idea is occurring except that it may be done electronicaly rather than mechanicaly. More involved to adjust as it may require hooking up a computerized engine analyizer to figure out what is out of calibration. FI engines may also do the fast idle using a solenoid that is adjustable, however if this is done electronicaly it may cost some money to fix. Again, if it lurches it should be looked at.
If you spend a lot of time in gear but not moving ( city driving ) you might save a bit of fuel by getting this fixed. Probably not enough to pay for the repair.
Wiki User
∙ 12y ago
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What would cause a Nissan Altima transmission to hesitate when putting it into drive or reverse?
I was told by my mechanic that the transmission hesitating after putting it in drive after reversing is a sign of the transmisison dying. ---------- Check transmission fluid. When the fluid is low there is not enough in the torque converter, so when you go to reverse or drive you have to rev the engine before it moves to compensate for less fluid in the torque converter.
Car will reverse but not drive?
transmission is gone.
Your truck reverse and turns on but it will not drive what could it be?
The transmission
Car goes reverse but not drive?
Get new transmission
Car will move in reverse but not drive?
bad transmission
Which type of transmission drive is noiseless?
An electric drive motor which can propel you like a transmission is very close to silent in comparison. To go in reverse just reverse the polarity.
What is the problem when the car will not go in reverse or go in drive the transmission fluid is still full?
what is the problem when the car will not go in drive or reverse? and the transmission fluid is still full
Your truck wont go in drive only reverse and drive low is it the whole transmission?
You are probably low on transmission fluids
Why does my car run in reverse but not in drive?
your transmission needs repaired
Why wouldn't a transmission go into reverse but goes into drive just fine?
It means the reverse clutch pack has gone out in your transmission and needs to be rebuilt or replaced.
I am having a problem with my transmission it won't go in reverse and takes off in drive like lugging?
your transmission is about to go, usually reverse goes first
Rumbling sound from car put in reverse or drive?
Transmission problems.
