Question about 1994 Mazda 323

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RPM Problems... When I drive my car for about 20 minutes (in town under 35 mph), the RPM jumps to 3 or 4. When i try to stop the car, I must stand on the break and force it to stop. Once stopped, the car idles very fast and tries to drive off without me. What might cause that?

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  • 321 Answers

Sounds like the throttle is sticking,and could be very dangerous.It could be a throttle cable going bad,or an enormous vacuum leak.

Posted on Jul 09, 2008

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Posted on Jan 02, 2017

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Drive cycle reset


Drive Cycle resets to reset the OBDII testing phases are very specialized to the year, model and engine of your car. So I can only speak generally. Start the car from fully cold and let it idle for about 15 minutes, then put the car into gear and drive it for about 5 minutes at 35 mph, then get on a highway and drive at about 60 mph for 15 minutes, come off the highway and drive around 40 mph for 3 minutes, come to a complete stop (like a stop sign) wait 30 seconds, drive off again up to 40 mph for 4 minutes - and repeat the last 2 steps (going up to 40 mph) about 3-5 times. Then repeat the last two steps going up to only 25 mph. Then come to a complete stop in your driveway and let the car idle for 10 minutes with the a/c on . After this is done, hook up a code scanner and see if it reset the modes to "ready".

Sep 30, 2015 | Cars & Trucks

1 Answer

When driving at a steady 35 to 40 mph, the engine rpm's instantly drop abour 20 to 30 rpm's What will cause this??


when was the last tune up or fuel filter chage and oil change done..if you cant remember, its time..repost please...

Jan 17, 2013 | 2004 Chevrolet Tahoe

1 Answer

My 98 town car is in a shop that says my transmission sensor is out and they have to go into tran. to replace. 1300 to rebuild tran. and fix. I have had no prior tran. problems. It will accellerate to 35...


Vanessa,give Lincoln/Mercury/Ford a call and run this by THEIR Service Manager. they are usually helpful
on the phone. Let us know what they say,please?(:^) don-ohio

Nov 01, 2011 | 1998 Lincoln Town Car

1 Answer

Have 1989 Lincoln Town Car. Transmisson will not shigft from 3rd to 4th gear. Only car drive about 25-30 mph. thanks


Are you sure the trans is in 3rd. Pull the stick into low gear accelerate shift to 2nd about 20 mph shift to 3rd about 35 mph then 4th about 50 mph. This will let me know how to go further with your problem. If you do this proceedure write the results on this Great FixYa Page!

Oct 18, 2010 | 1989 Lincoln Town Car

1 Answer

I have a 2001 nissan pathfinder 4w. The OBD system-readiness status: Says catalytic converters, NOT READY; oxygen sensors, NOT READY; evaporative system, NOT READY. So did not pass inspection, I was told...


You have to re-set the obd via using Nissan's approved drive-cycle which is;

1. Start the engine when the engine coolant

temperature gauge needle points to C. Allow

the engine to idle until the gauge needle

points between the C and H (normal operating

temperature).

2. Accelerate the vehicle to 55 MPH (88

km/h), then quickly release the accelerator

pedal completely and keep it released for at

least 6 seconds.

3. Quickly depress the accelerator pedal for a

moment, then drive the vehicle at a speed

of 53 to 60 MPH (86 to 96 km/h) for at least

5 minutes.

4. Stop the vehicle.

5. Accelerate the vehicle to 35 MPH (55 km/h)

and maintain the speed for 20 seconds.

6. Repeat steps 4 through 5 at least 3 times.

7. Accelerate the vehicle to 55 MPH (88 km/h)

and maintain the speed for at least 3 minutes.

8. Stop the vehicle and turn the engine off.

9. Repeat steps 1 through 8 at least one more

time.

If step 1 through 7 is interrupted, repeat the

preceding step. Any safe driving mode is acceptable

between steps. Do not stop the engine

until step 7 is completed. If you cannot or

do not want to perform the driving pattern, a
NISSAN dealer can conduct it for you.

Nov 15, 2009 | 2001 Nissan Frontier Crew Cab

1 Answer

2000 Volvo S40


one unit that operates ratio changes and is connected to the engine is that vacuum operated actuator on the transmission
it is possible that that unit is failing , vacuum hose is leaking and that will cause ratio changes as the vacuum varies
run the fault codes to check for wiring problems or VSS or TCM problems as well

Mar 23, 2017 | 2001 Volvo S40

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