Car Question:Timing and Trans

farmer boy · Jul 6, 2011

We had an oil seal go on a Toyota Camry and it was leaking oil into the tming belt area. The seal was replaced and a new belt put on. The car just didn't work the way it use to. Had no power. Trans would 'slip' with engine over 4000 rpm. Figured at first low oil may have caused problems. But it kept going. We asked them( garage that originally replaced the seal) to see if the timing was off, so they checked it, said yep, off 2 teeth. Now the car is all back to normal. Will easily go to 6000 rpm if asked to. What would cause this. I understand the lack of power but why did the trans act so odd? Acted like it was ready to die any minute.

Dodgeit · Jul 6, 2011

(quoted from post at 12:03:30 07/06/11) We had an oil seal go on a Toyota Camry and it was leaking oil into the tming belt area. The seal was replaced and a new belt put on. The car just didn't work the way it use to. Had no power. Trans would 'slip' with engine over 4000 rpm. Figured at first low oil may have caused problems. But it kept going. We asked them( garage that originally replaced the seal) to see if the timing was off, so they checked it, said yep, off 2 teeth. Now the car is all back to normal. Will easily go to 6000 rpm if asked to. What would cause this. I understand the lack of power but why did the trans act so odd? Acted like it was ready to die any minute.

Whoever put the belt on messed the timing up. Since the transmission is controled by the computor that reads rpms, AFR, water temp and a host of other things to know when to shift. It is not surprising that nothing worked right.

Bob · Jul 6, 2011

You didn't give the yet, but if an OLDER car, low vacuum from the timing mixup would affect the vacuum modulator on the transmission, causing weird shifts.

Newer car with electronic powertrain control, the same deal...

'Puter uses MAP sensor to read manifold vacuum, translates this (and other sensor readings) into "engine load" and mucks up shifts accordingly if vacuum is not what it's expected to be 'cause of the timing mixup.

NCWayne · Jul 6, 2011

No answer to your question per se but I had a 90 Ford Ranger that was having problems shifting in and out of OD, along with a few other minor shifting problems. The dealership traced all the problems back to a bad plug wire going to #3 cylinder. Something about the wire being bad was causing the computer to somehow get bad info and it acted accordingly. Sounds to me like what the other posts are saying are on the money based on what I experienced. When the computer recieves bad info, nothing is gonna work right.

Southern Ray · Jul 6, 2011

I replaced the timing belts on my daughter's Subaru many years ago.
The left bank that drives the distributor broke and the engine would not start.
I decided to replace the right bank while I was in there and found it was off by two teeth.
I was guessing the one who did the job earlier got it off by the two teeth.
Ran a lot better afterwards.

bradk · Jul 6, 2011

With the lack of power due to incorrect valve timing,you had to lean into the gas pedal more to get it going.The more ya lean on her,the higher the throttle angle and tp voltage which the tranny uses for proper shift points.It will make for a late shift which is sometimes described as a "slip".

Car Question:Timing and Trans

farmer boy

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Dodgeit

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Bob

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NCWayne

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Southern Ray

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bradk

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