1998 Honda CRV Late shift post rebuilt transmission

1998 HONDA CRV
147,800 MILES • 4 CYL • FWD • AUTOMATIC
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WEBRLAMY
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My 98 crv needed a transmission repair. The car drove great but the 2nd gear was slipping. After the rebuilt transmission (a Precision product, I believe when I was verbally promised Honda parts), the car shifts late with an increase in engine rpm. It is not much but very noticable and makes the job unacceptable. My mechanic, who said everything was good before the work was done including the engine, tried to tell me that the engine had an issue now and that ALL Hondas shift late. How can we resolve this in the best interest of all parties concerned? Please help me fix this.

(I will donate if answer fixes the issue, rather broke at moment as I paid the maximum going rate for the transmission job)
Apr 2, 2009 at 10:30 AM
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KHLOW2008
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Hi webrlamy, If the trans has no issues such as harsh shifting, slipping, delayed response, it should be ok. Here is a description of the trans operations which employs a grade logic control system.


https://www.2carpros.com/forum/automotive_pictures/192750_GradeLogicHonda_1.jpg

Under normal circumstances, the shifting would be governed by throttle opening, vehicle speed and engine performance. If the engine has any issues, the timing for the shifting might be delayed as it is taking longer for the vehicle speed to build up. Since your mechanic mentioned an issue with the engine, it could be possible and you should have a look at it.
Apr 9, 2009 at 10:49 AM
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WEBRLAMY
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Before doing the work on the transmission, my mechanic assured me that the engine was fine.

I have noticed that my speedometer is 4 miles slow now too...
Apr 9, 2009 at 11:07 AM
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KHLOW2008
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That could explain the late upshift. Lower speed sensing means the PCM is receiving a slower signal.

Possibly the trans was exchanged and the gear ratio might be different. Usually rebuilts means they would take your tran in and give you one they had rebuilt beforehand.

How did you gauge that your speedometer is 4 mph slower?
Apr 9, 2009 at 11:41 AM
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WEBRLAMY
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gps alerted us to it...thankfully! then measured via the mile markers.
Apr 9, 2009 at 12:40 PM
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KHLOW2008
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So guess the problem should be the trans speed sensor or might be a different gear ratio than originally was.

You can get back to the trans shop and explain this to them and see if they can come up with anything.
Apr 9, 2009 at 1:02 PM
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WEBRLAMY
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I spoke with him and will follow-up in person next week.

My tires have NOT changed, if anything, they may need air and definitely DO meet the specs for the vehicle. I even change my tires in pairs and always put the new ones on the front of my front-wheel-drive vehicle...so his concern over the tires being at issue now is NOT logical.

The speedometer was fine before the transmission fix...I believe he rebuilt it himself with my parts so that negates any changes to gear ratio factors, doesn't it?

...He is a very good mechanic and comes highly recommended...sigh...more next week unless you think of something...
Apr 9, 2009 at 1:38 PM
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KHLOW2008
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If it is from the same trans, there should be no problem with the speed difference as the ratios are unchanged.

However before trans rebuilt, was the speedometer synchronised with gps?
Apr 9, 2009 at 2:51 PM
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WEBRLAMY
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Same gps but I didn't track my vehicle with it and my kids say that they tracked their vehicle, not mine, so no data there from before.

I do know that the speedometer was faster than actual speed by about 1-2 miles based on a street "this is your speed" sign shortly BEFORE the rebuild...at the time, I figured that the street equipment was inaccurate.

But also in the mix is the fact that I was not pulled over by a radar gun reading just prior to the transmission work...I do drive right on the limit based on my speedometer...been some years since I had any issue with tickets (knock wood).
Apr 9, 2009 at 3:31 PM
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KHLOW2008
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Slight variation in speedometer and actual road speed is normal. GPs ia accurate to the dot whereas vehicle speedometer is a guide which is not 100 % accurste.

You do not have any data pertaining to accuracy before trans repairs so it wold be difficult to prove anything.
Apr 10, 2009 at 7:54 AM