Question about 1995 Ford F350

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1995 ford bronco 5.8l surges while going uphill

Engine surges at 2000-3000 rpm while going uphill. seems a little low on power

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  • Anonymous Mar 16, 2014

    Driving home today the car lost accelerating power going uphill also oil was leaking out the front of the motor it seems. What could be the problem?

  • Anonymous Mar 16, 2014

    Driving home today the car lost accelerating power going uphill also oil was leaking out the front of the motor it seems. What could be the problem?

  • Anonymous Mar 22, 2014

    engine intermittantly goes to up to 2000 rpm in drive and stopped.

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  • 10 Answers

Check vacume lines, knock sensor, and air intake sensor

Posted on Feb 18, 2009

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Car surging


Is the car equipped with the Automatic Transmission?
If so, read on.
Otherwise skip to the end and answer some questions.

POSSIBLE SCENARIO:
I have observed a condition where my car surges slightly when the torque-converter clutch (TCC) cycles between lock and unlock when driving on an uphill grade.
First some basics and history that will explain why the TCC is used.

Engine, Torque Converter, TCC, and Transmission relationship--
The TCC allows for a solid connection between the engine and transmission which allows the input to the transmission to rotate at the same speed as the engine.
Without a TCC, there is slippage between the engine and automatic transmission. The slippage is greatest at low engine RPM. That is what allows the engine to run with the automatic transmission in gear, like when you first shift into gear or stop at a stop sign. When the throttle pedal is depressed, the engine RPM begins to increase and the torque converter begins to slip less and less the more the engine RPM increases. The car moves. But even at cruising speeds the torque converter slips slightly. Engine RPM is greater than transmission input RPM, which is realized as slight decrease in fuel efficiency.
When acceleration is complete and a constant speed is being maintained, the engine power output is reduced to the point where the TCC can engage and eliminate any slippage between the engine and transmission. If the car has a tachometer the engagement of the TCC can be verified when a slight reduction in engine RPM observed without a corresponding change in vehicle speed.
One method used to test the operation of the TCC is as follows:
Find a flat section of road where it is safe to perform the test.
Reach a steady speed and keep the gas pedal depressed with one foot. While observing the tachometer (or listening for an increase in engine RPM), with the other foot depress the brake pedal enough to activate the break light switch but not enough to engage the brakes. When the brake light switch activates, the TCC receives a signal to disengage. With the gas pedal being held steady, release the brake pedal and the engine RPM should decrease when the TCC engages.
Old cars with Automatic Transmissions did not use a TCC. I believe the TCC was put in use in an attempt to increase fuel economy.

MY EXPERIENCE WITH SIMILAR SYMPTOMS
The condition that causes that issue on my car is this:
- A slight uphill grade increases the load on the engine.
The car tends to gradually slow and it is necessary to depress the gas pedal to maintain speed.
- Depressing the throttle pedal (manually, or automatically with cruise control engaged) signals the torque converter clutch to unlock when the load increases slightly. (A more drastic load increase would signal the Transmission to downshift to a lower gear.) The corresponding increase in engine RPM and output is enough to compensate for the reduction in speed. When the vehicle speed, engine RPM, and throttle position stabilize to the point that the TCC will engage and the engine RPM will reduce in correspondence with TCC engagement. Now, if the road conditions have not changed, power output is not enough to maintain vehicle speed. With the increased load caused by full engagement between engine and transmission, and the cycle (surging) repeats itself until the road conditions change.

Does that help?
If not:

QUESTIONS
Please define the symptoms.
What are the road conditions when the surge occurs? (A slight uphill grade?)
What is the frequency of the surge?
Does the engine power output have a noticeable surge?
Is there a speed change related to the surge?
Does the tachometer move up and down with little or no change in vehicle speed?
Are all instrument indication in the normal range?
What else has changed?

Good luck!

May 24, 2014 | Subaru Impreza WRX STi Cars & Trucks

1 Answer

Accelerating uphill


loses power
well if the RPM advances fast on engine and the car speed dont
that is tranny slip.
on the other hand if the engine RPM stays low, and speed is low that
is engine power loose.
2 completly different things, why not ask him which it is.
is my engine weak or is the the tranny slipping.
surely you know what slip means. right>?
like bumping in to neutral , under power. or partially
ENGINE RPM state that, going up said hill WOT
and can tell you.

Jan 31, 2014 | 1997 Honda Odyssey

1 Answer

1995 Ford Bronco engine dies when shifted into drive but runs in reverse or 1st gear


Could be fuel filter,air filter,tune up,wires,coils.low idle too low.

Jun 13, 2013 | 1995 Ford Bronco

1 Answer

Ac works fine except when i exclerate or go up a hill, it seems to cycle or stop blowing...then the continues to work fine but this is happening more often . I just got my ac repaired 3 months ago. it...


sounds like u still have a leak and need to have freon added or wasnt fully charged --when ur at idle or lower rpm the compressor will circulate the freon fine and will not cause a problem when u put a load uphill passing or increase the rpm a little more the compressor sucks more and circulates more freon which gives u a lower suction pressure if the suction pressure gets to low the the a/c protects itself and the engine by turning off [low pressure safety] cycling if had done 3 months ago bring back and have tested or u can buy some freon and add to ur system yourself

Jun 07, 2010 | 2004 Ford Expedition

1 Answer

The rpm's in my 1995 escort wagon surge when shifting from 2nd to


It sounds like your clutch is slipping. Does it do it more when the wagon is loaded or going uphill?
Most likely needs a new clutch.

Jul 23, 2009 | 1995 Ford Escort

3 Answers

Low rpm's in idle when heating/cooling system is on & surges.


Check your EGR or your Idle control Valve. This can cause a problem with your irratic idling

Apr 17, 2009 | 1995 Ford Explorer

1 Answer

1995 Ford Bronco dies when coming to a stop.


The idle air control solenoid could be bad. give the engine a vacuum leak and see if that helps any

Oct 15, 2008 | 1995 Ford Bronco

1 Answer

87 ford bronco II idling and power problem


check the i.a.c. (idle air control) valve near the throttle body, it fixed my low idle!

Sep 09, 2008 | 1987 Ford Bronco II

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