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Tractor Talk Discussion Forum

OT 93 Bonneville Converter Lockup Question

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ribbitt

03-03-2008 07:59:50




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Apologize for the OT, but I need your wisdom here. My 93 Bonneville started acting strangely a while back. The torque converter locks up and unlocks nicely in response to commands from the PCM, but two things seem a bit strange to me. First is that lockup only occurs above 38 mph, while the shop manual says it should happen around 28 mph. Not a real big deal. More importantly, it unlocks at any speed when the accelerator is at the idle position. I would think it should stay engaged above some speed, say maybe 45 mph. All that locking and unlocking at highway speeds seems excessive to me. What do you all think? BTW, I replaced the TPS, and it still does the same thing. Vehicle speed sensor (VSS) seems to be correct. No codes in the PCM....

Thanks, everyone!

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AndrewFromNS

03-03-2008 08:19:07




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 Re: OT 93 Bonneville Converter Lockup Question in reply to Bob, 03-03-2008 07:59:50  
I would suggest going over to www.bonnevilleclub.com and signing up...they're the YTMag of Bonnevilles. I know they'll be able to help you out!

AR



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Jon Hagen

03-03-2008 15:59:05




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 Re: OT 93 Bonneville Converter Lockup Question in reply to ribbitt, 03-03-2008 07:59:50  
You never want the converter locked with the throttle in the idle position. If you lock the brakes on a slippery road, it will stall the engine if the converter is locked. Ford got into trouble with their early lockup TQ transmissions for that very reason, hitting the brakes on a slippery road with the TQ locked would stall the engine, with loss of power steering and brakes.



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ribbitt

03-03-2008 10:14:12




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 Re: OT 93 Bonneville Converter Lockup Question in reply to ribbitt, 03-03-2008 07:59:50  
Man, I knew you guys would know the answer! Thanks! Driveability is great, except for the mildly annoying uptick in RPMs as it re-locks at highway speed after getting off the pedal. Don"t recall that from before, but CRS these days anyway. Shifts are smooth as silk and right where they need to be. I guess I won"t worry about it.

She"s a great old car. 155k miles, runs like a bunny, and gets 32 mpg on the highway, maybe 26 overall. Best of all, she"s paid for.

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Brokenwrench

03-03-2008 09:56:07




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 Re: OT 93 Bonneville Converter Lockup Question in reply to ribbitt, 03-03-2008 07:59:50  
Sounds right to me. You may as well not look at what the shop manual suggests. GM has about 50 different calibration proms for the PCM. I`ve had em where they won`t lock-up til 60-62mph. That was GMs early fix to shudder problems. Most GM front wheel drives won`t command lock-up til over 40-45mph.

The TCC should unlock at closed throttle, otherwise you can get those on the gas, off the gas drivers that can really make the car start to buck. There`s nothing you can do in the trans to change lock-up timing or release, 100% computer commanded. Good luck and keep driving her, those are great cars. BW

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bradk

03-03-2008 09:01:42




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 Re: OT 93 Bonneville Converter Lockup Question in reply to ribbitt, 03-03-2008 07:59:50  
Everything sounds pretty normal to me.The PCM should unlock the converter every time the accel pedal is released.As far as lock-up speed,me I'd rather have it lock closer to 40mph to avoid the lugging feeling at lower speeds.


Are there any drivability problems?Does it shift normally?Detent cable can be adjusted real easy.



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Brokenwrench

03-03-2008 09:58:41




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 Re: OT 93 Bonneville Converter Lockup Question in reply to bradk, 03-03-2008 09:01:42  
No detent cable, but if shifts start to get soft you can buy an aftermarket adjustable vaccuum modulator for about $15.00. Turn the set screw in a couple turns and she comes right back to life.. BW



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Bob

03-03-2008 08:06:23




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 Re: OT 93 Bonneville Converter Lockup Question in reply to ribbitt, 03-03-2008 07:59:50  
I would look at the MAP (MAF, if so equipped) sensor readings with a scan tool. The 'puter looks at manifold vacuum, an indicator of engine load, before ordering lockup.



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