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Problem with 1999 Mazda 626 2.5L w/ AC

N

navyBRADse

CEG'er
Joined
Nov 17, 2004
Messages
305
Location
Toledo, Ohio
My 1999 Mazda 626 recently developed a problem last night, and I'm trying to figure out the issue.

While driving, the car started shaking horribly (and it does the same sitting still at idle). The check engine is on, and starts flashing constantly.

When the car goes to shift (I believe its into 3rd gear...hard to tell with the shaking and an auto transmission), it will get to 3000rpm, act like its going to shift, jump to 3500rpm, then one more small jump of about 250rpm and then finally shifts. To shift out of other gears, the car has to be around 4000/5000rpm before it will do anything. (It also quickly ramps up to those rpms as well)

I have to push the pedal to the floor in order to get it to "granny accelerate", as I like to describe it. When going up hills, the car will be at 3000rpm and still loses speed.

Any help would be appreciated, and if you have any specific questions in order to help diagnose this, I'll be checking this constantly.

I had the serpentine belt replaced today, as it was going bad and to see if it was causing the issue, and the oil changed (only 100 miles over its due mileage). The car has 159k miles on it.

Thanks guys.
 
I'm no expert, but I think your torque converter (TC) may not be functioning correctly.

Try this quick test. With the car in drive, hold the brake with one foot and press the accelertor with the other. The RPM should climb to about 2000-3000 RPM and hold steady. The engine should also sound smooth at this point.

Release the brake and keep your foot where it was on the accelerator. If your TC is working right, you should feel a somewhat powerful initial launch. What is supposed to happen is the TC multiplies the torque from the engine to give you more acceleration. If its not working the torque from your engine varies all over the place and results in a "no power" feeling.
 
I'm taking the car in for a full diagnostic tomorrow. The engine is clearly misfiring for some reason or another, and it is more than likely the main cause of all of this.
 
MLPS?

conez0 said:
I'm no expert, but I think your torque converter (TC) may not be functioning correctly.

Try this quick test. With the car in drive, hold the brake with one foot and press the accelertor with the other. The RPM should climb to about 2000-3000 RPM and hold steady. The engine should also sound smooth at this point.

Release the brake and keep your foot where it was on the accelerator. If your TC is working right, you should feel a somewhat powerful initial launch. What is supposed to happen is the TC multiplies the torque from the engine to give you more acceleration. If its not working the torque from your engine varies all over the place and results in a "no power" feeling.
Click to expand...

i've seen this method of "testing" destroy sickly transmissions. take it to a shop and have the codes read, one things is i've been told that your MLPS will not throw a code. i don't know if it's true all i know is that mine didn't.
 
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