Automatic taking longer to lockup
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From: KS
Automatic taking longer to lockup
Both of my trucks have the automatics in them with one being the o1 V10 and the other being a 95 diesel. The automatics in both of them used to lock up at the same corner every cold morning (4 miles away). The V10 has been locking up about a mile later now. Is this a sign of anything such as needing an oil change, tranny failure, etc or am I just being an alarmist?
Thanks in advance
Kelly
Thanks in advance
Kelly
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From: Long Island USA
The computer won't lock the TC up until it's to a certain temp. Either it's colder outside, or the temp sensor is sliding (calibration wise).
My '01's lockup is noticably longer when it gets colder outside, based on how much load I'm pushing. I find even 500 lbs in the bed will affect where the TC will lockup when the temps are the same.
Also, my tranny had been shifting funny, like it wasn't modulated correctly, sometimes slipping too much, and then not enough.
I cleaned my MAF and it shifts perfect again.
My '01's lockup is noticably longer when it gets colder outside, based on how much load I'm pushing. I find even 500 lbs in the bed will affect where the TC will lockup when the temps are the same.
Also, my tranny had been shifting funny, like it wasn't modulated correctly, sometimes slipping too much, and then not enough.
I cleaned my MAF and it shifts perfect again.
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From: KS
Is it the tranny temp that triggers lockup or engine temp? I realize the colder air temps take longer to lockup. In summer time they are normally locked up within 1.5 miles. When you say clean the MAF, are you talking about spraying it with brakleen?
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Joined: Jul 2002
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From: Long Island USA
Originally Posted by kelro
Is it the tranny temp that triggers lockup or engine temp? I realize the colder air temps take longer to lockup. In summer time they are normally locked up within 1.5 miles. When you say clean the MAF, are you talking about spraying it with brakleen?
Brake cleaner, yes...
Mountain Pass
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I just notice this sensation yesterday with my wife's truck. This is the first winter we've owned it and I think yesterday was the first time I've taken it out immediately onto the highway on a bitterly cold morning from it's overnight cold soaking. I noticed right away that the RPM's were about 400 higher than they should have been for going 60mph. I travelled about 3 miles and had to pull over to clear some snow off the bed cover. the truck idled for about 2 minutes while I was out of the truck and after I got going again the TC started locking up normally once again. I also was curious if this is normal operation or whether it is an early sign of trouble. Cheers PS. It my wifes truck when were not towing, "She loves it" and I'm stuck with a company minivan.
Last edited by gitane59; Feb 12, 2006 at 07:38 AM.
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Joined: Jul 2002
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From: Long Island USA
Originally Posted by gitane59
I just notice this sensation yesterday with my wife's truck. This is the first winter we've owned it and I think yesterday was the first time I've taken it out immediately onto the highway on a bitterly cold morning from it's overnight cold soaking. I noticed right away that the RPM's were about 400 higher than they should have been for going 60mph. I travelled about 3 miles and had to pull over to clear some snow off the bed cover. the truck idled for about 2 minutes while I was out of the truck and after I got going again the TC started locking up normally once again. I also was curious if this is normal operation or whether it is an early sign of trouble. Cheers PS. It my wifes truck when were not towing, "She loves it" and I'm stuck with a company minivan.
You can easily tell if the TC is not locked up by pressing a little more on the gas, and then a little less, and back and forth. If the RPM's vary a few hundred RPM's, the TC isn't locked up.
My '01 has done this since brand-new, and my wife's '97 Cougar does the same thing (different tranny though).
I'm not sure if it's really for heating up the tranny quicker or just getting rid of the "lockup shudder" when the fluid is cold.
