Torque Coverter Question
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Torque Coverter Question
At highway speeds (70mph), when getting on the gas, I think my torque converter is giving out. I have checked a lot of the old posts on the forum and can't find a description of what the RPMs do when the torque conv. gives that "pop" and loss of acceleration when jumping on the gas to pass on the highway. At 70mph, when I approach 3000 rpms, it kinda pops, and then my RPMs begin to drop off, even if I hold the accelerator down. When I get off the gas and drop a few mph (down to 65), it will run okay until i floor it again. Thanks for any info.
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When, I say pop - it's not really a noise, but more like a feeling. It almost sounds like the engine is reving, but I don't think it is. I am lost. At one point I did think it was the rev limiter problem, but I didn't think that would kick in at 3000rpm. Can limiters malfunction and limit rpms at too low a level?
If it was the torque converter going out, would the RPMs shoot up w/o actual any gain in speed while on the gas?
Sorry about reposting on the same topic. I wanted to edit my original post, but for some reason I don't have an edit button available. Thanks.
If it was the torque converter going out, would the RPMs shoot up w/o actual any gain in speed while on the gas?
Sorry about reposting on the same topic. I wanted to edit my original post, but for some reason I don't have an edit button available. Thanks.
Cargo Master
Joined: Jun 2003
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From: Somewhere Saskatchewan
Noop. Sorry but convertors don't act that way.
If a convertor is slipping your get up and go would have got up and went.
The engine would rev high before initial take off.
On the other end of the spectrum if the over run clutch in the convertor were seized the top end would be very low.
If a convertor is slipping your get up and go would have got up and went.
The engine would rev high before initial take off.
On the other end of the spectrum if the over run clutch in the convertor were seized the top end would be very low.
Lead Driver
Joined: Jul 2003
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From: Wheatland, Mo
WHat STUART1 said. If the TC is going out, it would act like you are half clutching it and it would "slip". When electronics go out, or portions, it can do many things...rev limiter may be having a prob and thinking it is at a higher RPM then what you really are. Although, if it doesn't do the same thing at lower speeds when it hits 3000RPMs, then I would tend to think maybe the speed limiter. I don't remember what year they started it in but there is a "limiter" for your speed. I had a little sportscar that would shut down when it 125MPH, and kick back in at 120mph. Now, I know it may sound weird, but it is known that with some setups, when you add like an FIPK, or some aftermarket intake parts, the air turbulence coming from under the vehicle can create too much turbulence and actually "choke" the engine, cutting off the air. That is why you usually see factory air units fully enclosed to the intake. COuld be a lot of possible reasons. Is your CEL on? May be able to pull some codes.
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Thanks so far for the info. No, the CEL is not on. I will try see if I am getting any codes. I was also thinking it could be a fuel problem or advancing problem?
Can the speed limiter go bad, or is it just a program - and could it get out of whack? I used to be able to hit 90-95 no problem. Now, I can barely get upto 70-75. Thanks for the help.
Can the speed limiter go bad, or is it just a program - and could it get out of whack? I used to be able to hit 90-95 no problem. Now, I can barely get upto 70-75. Thanks for the help.
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Lead Driver
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From: Wheatland, Mo
I am thinking it is in the programming, although its possible, but not likely.... When was the last time you checked your fuel filter?
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Lead Driver
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From: Wheatland, Mo
Catalytic converter would affect your power regardless of speed....probably even more at lower speeds since you have more torque then. Usually when cats go out, they begin to clog the exhaust path in the cat itself...so when you accellerate, it causes the "clog" to react faster. Plus the exhaust pressure is higher when accellerating at lower speeds since you are at higher RPMs.
Last edited by BillyBob69; May 4, 2005 at 08:12 AM.
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I pulled codes today and the only code I am getting is 628 - excessive torque converter slippage. I cleared the codes and took it for a drive. Checked again and it came back up. Even though this is not causing the problem I posted about - anybody have any guess on how long I have befor it totally goes out? Can a tranny shop tell me anything special about how bad it might be...Fluid checked out ok...Nice color and smell. Like I said before, I am just worried it's gonna blow up on my during my move cross country.
Also, is it worth just changing out the coverter? I think the tranny is original.
Last, I took it out on the freeway and gassed the hell out of it...The original problem I posted about didn't show up at all...But I am still changing all my filters and probably wires, plugs, and cap. Thanks for all the info.
-George
Also, is it worth just changing out the coverter? I think the tranny is original.
Last, I took it out on the freeway and gassed the hell out of it...The original problem I posted about didn't show up at all...But I am still changing all my filters and probably wires, plugs, and cap. Thanks for all the info.
-George
Last edited by gnmano; May 4, 2005 at 09:48 PM. Reason: add one more question