Home » Public Forums » GMCnet » Transmission does not engage when cold (once warmed up, works fine)
| Transmission does not engage when cold [message #260128] |
Tue, 26 August 2014 16:29  |
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MangoMushroom
Messages: 67
Registered: August 2008
Location: Emeryville, CA
Karma: 0
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My transmission does not engage when cold, but once its warmed up, it works fine. Transmission fluid level is good.
If I rev the engine high, it allows the transmission to engage even when its cold. I tend to do this in neutral, then shift into Drive after the high rev. Sometimes this leads to transmission jerking into gear.
If I don't take my foot off the gas, the trans stays engaged. If I drive for 2-3 minutes without stopping, symptoms go away completely. I assume this is because the transmission fluid is warmed up and free to flow. This leads me to suspect it might be the transmission filter not allowing fluid to flow freely? Or perhaps it is something else?
This transmission has exhibited these symptoms since first being installed in June of 2012. Its a Manny Tranny.
I'm worried that I am damaging the transmission when I need to rev the engine high to make the transmission suddenly engage.
Any feedback is greatly appreciated! Thanks,
****MangoMushroom
`76 GMC Birchaven named "Harvey"
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| Re: Transmission does not engage when cold [message #260145 is a reply to message #260128] |
Tue, 26 August 2014 18:31  |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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MangoMushroom wrote on Tue, 26 August 2014 14:29My transmission does not engage when cold, but once its warmed up, it works fine. Transmission fluid level is good.
If I rev the engine high, it allows the transmission to engage even when its cold. I tend to do this in neutral, then shift into Drive after the high rev. Sometimes this leads to transmission jerking into gear.
If I don't take my foot off the gas, the trans stays engaged. If I drive for 2-3 minutes without stopping, symptoms go away completely. I assume this is because the transmission fluid is warmed up and free to flow. This leads me to suspect it might be the transmission filter not allowing fluid to flow freely? Or perhaps it is something else?
This transmission has exhibited these symptoms since first being installed in June of 2012. Its a Manny Tranny.
I'm worried that I am damaging the transmission when I need to rev the engine high to make the transmission suddenly engage.
Any feedback is greatly appreciated! Thanks,
You might try adding a bit more fluid. The fluid level rises when the transmission warms. Don't overdo it. But perhaps it is sucking a bit of air until it warms up. I have had one do it.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: Transmission does not engage when cold [message #260163 is a reply to message #260128] |
Tue, 26 August 2014 20:52 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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MangoMushroom wrote on Tue, 26 August 2014 16:29
This transmission has exhibited these symptoms since first being installed in June of 2012. Its a Manny Tranny.
I'm worried that I am damaging the transmission when I need to rev the engine high to make the transmission suddenly engage.
Any feedback is greatly appreciated! Thanks,
Call Manny - he's the go to guy for GMCMH transmission questions. Especially if it's one of his.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Transmission does not engage when cold [message #260208 is a reply to message #260128] |
Wed, 27 August 2014 08:46 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Call Manny
Todd Sullivan
Sully
77 royale
Seattle
> On Aug 26, 2014, at 2:29 PM, Andre Mandel wrote:
>
> My transmission does not engage when cold, but once its warmed up, it works fine. Transmission fluid level is good.
>
> If I rev the engine high, it allows the transmission to engage even when its cold. I tend to do this in neutral, then shift into Drive after the high
> rev. Sometimes this leads to transmission jerking into gear.
>
> If I don't take my foot off the gas, the trans stays engaged. If I drive for 2-3 minutes without stopping, symptoms go away completely. I assume
> this is because the transmission fluid is warmed up and free to flow. This leads me to suspect it might be the transmission filter not allowing fluid
> to flow freely? Or perhaps it is something else?
>
> This transmission has exhibited these symptoms since first being installed in June of 2012. Its a Manny Tranny.
>
> I'm worried that I am damaging the transmission when I need to rev the engine high to make the transmission suddenly engage.
>
> Any feedback is greatly appreciated! Thanks,
> --
> ****MangoMushroom
> `76 GMC Birchaven named "Harvey"
>
>
>
>
> _______________________________________________
> GMCnet mailing list
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: Transmission does not engage when cold [message #260353 is a reply to message #260128] |
Thu, 28 August 2014 12:02 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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I agree as well - check the fluid level carefully... an automatic tranny will act like yours if it's a little low on fluid. And since the tranny's been worked over, it's always possible that the dipstick might be a little off. I once had a similar problem with a VW Jetta - it uses a standpipe that's supposed to let any extra fluid drain out, leaving the fluid at the perfect level. But since I'd had the tranny out and knew for a fact that I didn't have enough fluid in the tranny even though the standpipe was dribbling some out, I just added half a quart at a time, test driving after each fluid add. The problems got better every increment, and I stopped adding fluid when the tranny once again worked perfectly. You might consider a similar approach.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: Transmission does not engage when cold [message #260606 is a reply to message #260353] |
Mon, 01 September 2014 00:09 |
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MangoMushroom
Messages: 67
Registered: August 2008
Location: Emeryville, CA
Karma: 0
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Thanks everybody for your feedback on this post and my issue with my transmission.
Mark, if my dipstick is off, and I do indeed have low tranny fluid, you are right that adding more may fix the issue.
However, if the fluid level is correct, or high, I will end up with too much fluid in the transmission.
If adding fluid doesn't solve the problem, I assume I'll need to siphon out the extra fluid through the dipstick tube?
Thanks again for your feedback everyone.
Also, does anyone have Manny's number on hand? I don't think giving him a ring this week would hurt!
Thanks again,
****MangoMushroom
`76 GMC Birchaven named "Harvey"
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| Re: Transmission does not engage when cold [message #260609 is a reply to message #260606] |
Mon, 01 September 2014 04:49 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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You do not need to siphon out the excess fluid. Remove the modulator (one bolt). That will allow the trans to drain to the correct level. When it stops draining, you are st the full mark.
NOTE: Only do this immediately after running the engine so the torque converter is full. If you wait some of the fluid from the torque converter will drain back into the pan and you will then drain too much with the modulator removed.
If you remove the modulator and nothing comes out then you are low on fluid.
So I would run the engine, turn it off. remove the modulator, and start adding fluid until it starts coming out of the modulator hole. Then replace the modulator.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Transmission does not engage when cold [message #260612 is a reply to message #260609] |
Mon, 01 September 2014 07:00 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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On Mon, Sep 1, 2014 at 5:49 AM, Ken Burton wrote:
> You do not need to siphon out the excess fluid. Remove the modulator (one
> bolt). That will allow the trans to drain to the correct level. When it
> stops draining, you are st the full mark.
>
> NOTE: Only do this immediately after running the engine so the torque
> converter is full. If you wait some of the fluid from the torque converter
> will drain back into the pan and you will then drain too much with the
> modulator removed.
>
> If you remove the modulator and nothing comes out then you are low on
> fluid.
>
> So I would run the engine, turn it off. remove the modulator, and start
> adding fluid until it starts coming out of the modulator hole. Then replace
> the modulator.
> --
>
THEN, read and re-mark the dipstick so you don't have to do it again.
Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Transmission does not engage when cold [message #260632 is a reply to message #260612] |
Mon, 01 September 2014 11:40 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Mr Kens
An excellent bit of info that just about everyone should check.
I have an outside trans stick to install and will check my level when I put
it in...on level ground of course (g) .
Thanks guys
Mike in NS
On Mon, Sep 1, 2014 at 9:00 AM, Ken Henderson
wrote:
> On Mon, Sep 1, 2014 at 5:49 AM, Ken Burton wrote:
>
>> You do not need to siphon out the excess fluid. Remove the modulator
> (one
>> bolt). That will allow the trans to drain to the correct level. When it
>> stops draining, you are st the full mark.
>>
>> NOTE: Only do this immediately after running the engine so the torque
>> converter is full. If you wait some of the fluid from the torque
> converter
>> will drain back into the pan and you will then drain too much with the
>> modulator removed.
>>
>> If you remove the modulator and nothing comes out then you are low on
>> fluid.
>>
>> So I would run the engine, turn it off. remove the modulator, and start
>> adding fluid until it starts coming out of the modulator hole. Then
> replace
>> the modulator.
>> --
>>
>
> THEN, read and re-mark the dipstick so you don't have to do it again.
>
> Ken H.
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--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
I am not an alcoholic; alcoholics go to meetings.
I am a drunk; I go to parties !
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| Re: Transmission does not engage when cold [message #264320 is a reply to message #260128] |
Wed, 15 October 2014 18:50 |
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MangoMushroom
Messages: 67
Registered: August 2008
Location: Emeryville, CA
Karma: 0
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An update:
of course, it turned out my trans fluid was low.... after topping off everything is fine again.
Now I have a coolant leak coming from right around the water pump. Not sure if it gasket or seal, but I am losing coolant consistently and fairly quickly. Approx 3 hours of engine run time and I'm out of coolant. May have something to do with the fact that I added straight antifreeze not realizing it wasn't already mixed 50/50.
If it is indeed the pump that is leaking, looks like I'll need to go to my friends at Applied GMC to fix the problem!
****MangoMushroom
`76 GMC Birchaven named "Harvey"
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| Re: Transmission does not engage when cold [message #264398 is a reply to message #260606] |
Thu, 16 October 2014 22:28 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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MangoMushroom wrote on Sun, 31 August 2014 23:09Thanks everybody for your feedback on this post and my issue with my transmission.
Mark, if my dipstick is off, and I do indeed have low tranny fluid, you are right that adding more may fix the issue.
However, if the fluid level is correct, or high, I will end up with too much fluid in the transmission.
If adding fluid doesn't solve the problem, I assume I'll need to siphon out the extra fluid through the dipstick tube?
Thanks again for your feedback everyone.
Also, does anyone have Manny's number on hand? I don't think giving him a ring this week would hurt!
Thanks again,
I suspect your converter is leaking down due to a bad seal. It leaks internally so you won't see anything. You can tolerate it for a while but it will tend to get worse over time to the point the pump won't be ale to pump it back up.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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