Transmission not downshifting.

Tiny
BOWHUNTER247
  • MEMBER
  • 1988 CHEVROLET S-10
  • 2.8L
  • V6
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
Okay, so about a month ago I figured I would changed my fluid filter and gasket since the mileage was not that high. Two weeks after that pulling out from a dead stop I felt something like a slip of some sort the engine rpm's went higher then car speed then it grabbed again not sure what that was about. Then from there on out it took it a lot longer to up shift threw gears until it got to the point where it did not want to shift at all until you accelerated hard. So I was told by the guy at the transmission shop that it could be my distributor. So I took it out of the transmission and he did something to the bearings and now for about two months straight it has been shifting somewhat smooth it just pulls out in second gear and as soon as it changes to third it bogs down and takes it a second to catch up speed, but will not downshift to first at all sometimes it downshifts to second when coming to a complete stop. I can feel a clunk in the front end if I change the gears manually it acts if the problem is not there it shifts great manually all threw the gears. My tv cable was spliced near the throttle body so I replaced it hoping that would fix it, but no luck. Also my tv plunger valve in my throttle body was sticking and I replaced it with a new spring I am not sure what to do except to put another transmission in it. I am running out of options.
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Friday, June 24th, 2016 AT 9:57 PM

7 Replies

Tiny
KEN
  • ADMIN
Hello,

It sounds like you have a problem with the filter sucking in air, did you replace the o ring seal the filter uses to seal against the case? Also sometimes the old seal can get stuck in there then the new filter has one on there so you might have two seals, which will create a problem. Please recheck your work and get back to me.

Best, Ken
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Friday, June 24th, 2016 AT 10:42 PM
Tiny
BOWHUNTER247
  • MEMBER
Well I dropped the pan and checked the filter. O ring was a little worn so I replaced filter and gasket and noticed when I started the truck the service engine light cane on and showed code 43 witch I think means electronic spark control or knock sensor I have had that code before and replaced knock sensor so it must be the wireing that goes to the knock sensor I am not shure. As far as the truck runs now still doing same thing and its terrible going up hills Boggs way down I usually just downshift it manually so it's not straining so hard. Looks like it's coming down to another transmission.
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Friday, July 1st, 2016 AT 8:13 PM
Tiny
KEN
  • ADMIN
So does it seem like the engine has low power?
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Wednesday, July 6th, 2016 AT 8:13 PM
Tiny
BOWHUNTER247
  • MEMBER
Yes it does. If I shift manually it shifts fine as soon as I put it into (D) drive it pulls out in second gear and shifts to 3rd fine then the rpms drop and it takes it a second to catch up to speed. You can here it quite well when the rpms drop. It will downshift from 3rd to second sometimes but never all the way to first. Also when it does downshift there is a clunk under the driver floor board it feels like something is slideing forward when coming to a stop.
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Friday, July 8th, 2016 AT 12:35 AM
Tiny
KEN
  • ADMIN
It sounds like you have a plugged exhaust system, check out this article to help,

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Let me know what you find
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Friday, July 8th, 2016 AT 9:19 AM
Tiny
BOWHUNTER247
  • MEMBER
I have an exhaust leak at the manifold also I think the converter is clogged because it back fires every now and then. Would having a clogged exhaust cause shifting problems?
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Wednesday, July 27th, 2016 AT 6:07 PM
Tiny
KEN
  • ADMIN
O yes, the computer see the vacuum of the engine and adjusts the shifting points so if the exhaust is plugged it will effect the transmission.
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Thursday, July 28th, 2016 AT 8:06 AM

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