Problems with Torque Converter Lockup??
03-02-2005, 09:11 PM
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Problems with Torque Converter Lockup?? I have a 2000 T/A, originally 2.73 geared, switched to 3.42's, stock computer tune, premium 93 gas. While breaking in the gears the torque converter lockup worked fine 1200 miles. Lately, I have been experiencing pinging when the engine is under load while the converter is locked, or the instant I go WOT while in OD with the converter locked. This has been constant thru four tanks of gas, two from Mobil, two from Amoco. I am getting up to 9 degrees KR and hear an audible pinging under these conditions:
-In Overdrive, around 40MPH, converter locked. If I give it 1/4 throttle, the converter stays locked and the engine will ping and pull timing, between 4-9 degrees. At the same speed with the converter unlocked there is no ping or KR.
-Going to WOT from OD with converter locked. While the trans is unlocking and downshifting the engine will ping and will pull between 4-9 degrees KR. Going WOT from any other gear when the converter is not locked produces 0 KR. I can go WOT from a stop all the way thru the 1320 and no KR.
I changed the plugs to stock platinum stock gap, changed fuel filter, PCV valve, air filter. All my sensors are working properly, the coolant temp never exceeded 190, outside air temp was around 70. The tranny is stock, no shift kit, no converter, fresh fluid, proper level <63K miles>. I have a handheld tuner <VHP> which I took out 10% timing and added 15% fuel for kicks and still had the ping.
I was told that my converter or TC lock up solenoid was "lazy" in unlocking my converter which is causing the pinging and KR. The converter has no problem locking up, and the unlocking does not seem to take long, although while cruising I have to give it atleast 1/2 throttle to unlock. The engine only pings and gets KR when converter lockup is in the picture. What do you think of this scenerio? Would the gear swap come into play with this <engine sees less load, converter takes longer to unlock>, or bad lockup solenoid, or converter, or???? Any insight would be appreciated as I would like to be a little informed before I take my car to a tranny shop.
-In Overdrive, around 40MPH, converter locked. If I give it 1/4 throttle, the converter stays locked and the engine will ping and pull timing, between 4-9 degrees. At the same speed with the converter unlocked there is no ping or KR.
-Going to WOT from OD with converter locked. While the trans is unlocking and downshifting the engine will ping and will pull between 4-9 degrees KR. Going WOT from any other gear when the converter is not locked produces 0 KR. I can go WOT from a stop all the way thru the 1320 and no KR.
I changed the plugs to stock platinum stock gap, changed fuel filter, PCV valve, air filter. All my sensors are working properly, the coolant temp never exceeded 190, outside air temp was around 70. The tranny is stock, no shift kit, no converter, fresh fluid, proper level <63K miles>. I have a handheld tuner <VHP> which I took out 10% timing and added 15% fuel for kicks and still had the ping.
I was told that my converter or TC lock up solenoid was "lazy" in unlocking my converter which is causing the pinging and KR. The converter has no problem locking up, and the unlocking does not seem to take long, although while cruising I have to give it atleast 1/2 throttle to unlock. The engine only pings and gets KR when converter lockup is in the picture. What do you think of this scenerio? Would the gear swap come into play with this <engine sees less load, converter takes longer to unlock>, or bad lockup solenoid, or converter, or???? Any insight would be appreciated as I would like to be a little informed before I take my car to a tranny shop.
03-02-2005, 09:59 PM
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you know i forgot about your gear swap. i know the VHP tuner fixes the speedo. but i wonder about lock up. i'll ask roger about it tomorrow. you can try the "Enhance Trans Shifting" which raises the stock shift points about 300 rpms. Even on part throttle, it delays the shifting about 300 rpms.
03-02-2005, 10:05 PM
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Originally Posted by mrr23
you know i forgot about your gear swap. i know the VHP tuner fixes the speedo. but i wonder about lock up. i'll ask roger about it tomorrow.
03-03-2005, 01:02 PM
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My truck does the same thing on the lower-speed / high-load unlocks.
I was/am able to get rid of it in two manners:
I "loosend up" my TCC unlock points, so that it doesn't require as much throttle...
or
I reduced timing in that higher load area of the timing table...
I was/am able to get rid of it in two manners:
I "loosend up" my TCC unlock points, so that it doesn't require as much throttle...
or
I reduced timing in that higher load area of the timing table...
03-03-2005, 01:32 PM
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Originally Posted by marc_w
My truck does the same thing on the lower-speed / high-load unlocks.
I was/am able to get rid of it in two manners:
I "loosend up" my TCC unlock points, so that it doesn't require as much throttle...
or
I reduced timing in that higher load area of the timing table...
I was/am able to get rid of it in two manners:
I "loosend up" my TCC unlock points, so that it doesn't require as much throttle...
or
I reduced timing in that higher load area of the timing table...
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03-03-2005, 02:12 PM
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I was thinking maybe: less load due to the gears=torque converter staying locked longer........ You start giving it gas while cruising and the computer advances timing and adds more fuel but the converter doesn't unlock.......maybe??
03-03-2005, 02:17 PM
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Originally Posted by mrr23
you know i forgot about your gear swap. i know the VHP tuner fixes the speedo. but i wonder about lock up. i'll ask roger about it tomorrow. you can try the "Enhance Trans Shifting" which raises the stock shift points about 300 rpms. Even on part throttle, it delays the shifting about 300 rpms.
03-03-2005, 06:20 PM
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the hiperf stock cam raises the REV limiter 300 rpms. the enhance trans shifting raises the SHIFT point 300 roms. two seperate things.
and i don't mind you posting about it. i've been talking to dan98z about it as well. talked with joe vinci about the gear swap. so long as you corrected it with the tuner, it won't affect the lock up. because it depends on the speedo mph to lock/unlock.
and i don't mind you posting about it. i've been talking to dan98z about it as well. talked with joe vinci about the gear swap. so long as you corrected it with the tuner, it won't affect the lock up. because it depends on the speedo mph to lock/unlock.
03-04-2005, 06:30 PM
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Anyone else have some insight? The pinging seems to also be temperature related....the longer I drive the car/sit in traffic, the worse it is.....
