93 Mark w/ premature lockup when cold and shudder on decel - TCCoA Forums
 
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post #1 of 7 (permalink) Old 03-24-2016, 02:28 PM Thread Starter
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93 Mark w/ premature lockup when cold and shudder on decel

I've searched and haven't found much similar to the problem I'm experiencing, so here goes.

93 Mark VIII, 230,000km's, fluid was changed via pan drop and draining t/c, refilled with motorcraft mercon v, installed 96+ dorman pan and 96+ filter about 2 months/5000km's ago.

For the past month or so, and only on a cold start, the torque converter locks prematurely, instead of 'slipping' as it should until warm. This happens immediately after the tranny shifts to 4th gear.

When I decelerate, it feels like t/c shudder, but it's almost as if the car is bucking. Tapping the brake pedal stops the shudder, so the t/c is unlocking when commanded, which is good.

This goes one for about a minute, until the tranny reaches the temp where it would go back into its normal shift schedule.

From there on, the tranny is perfectly normal, shifts fine, doesn't slip, yada yada. The problems don't happen every day, but seem to happen more on cold days, and only on the first start of the day after sitting all night.

The check engine light is NOT on and the fluid still looks nice and clean. And it's at the correct level, idling hot, in park. Note that when I dropped the pan the magnet was really clean, and the fluid was clear and bright red. The lollipop was gone, so the trans has had some service in the past.

Could this be something as simple as a bad tranny oil temp sensor allowing the tranny to go into normal shift schedules prematurely, or is there something worse going on inside?
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post #2 of 7 (permalink) Old 03-26-2016, 10:07 AM
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I say it's something VERY tired in your Main Valve Body that IMO not worth fixing - U have what's becoming a VERY rare 93 SURVIVOR 4r70w - I have Cold Lockup in my completely rebuilt & updated 96 Tranny & Main VB (not just a JMOD) every day w/no probs (as long as Plugs & Wires are good) - I have cold lockup in my Stock 95 Tranny & Main VB w/only 60K Miles & occasionally it weirds out like yours - I blame it on my 95 Main VB - So what I do now in the 95 is use OD off until it warms a tad (like u do when Spark Plugs are tired) - & Remember... U won't get a CEL - U'd get a Blinking OD Lite - (CEL is plugs/wires so really non-Trans related but often mis-diagnosed as TC Shudder).

BTW glad to see your TBIRD is the Beater & NOT the MK~!

GET OFF MY LAWN~! ... & Let's not forget guys... There's still a dead Imaginary Ex-Girlfriend out there...
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post #3 of 7 (permalink) Old 03-28-2016, 07:18 PM
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Quote:
Originally Posted by BUCK
BTW glad to see your TBIRD is the Beater & NOT the MK~!
The TBIRD is gone to the crusher..The MK is his Winter beater now..

If it makes you feel better..lol






Rayo..

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post #4 of 7 (permalink) Old 03-28-2016, 07:55 PM
No, Mr. Lemmywinks, No!!!

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A very few of the 93 marks have 8 bolt cranks that are forged; there used to be a pic...

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.


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post #5 of 7 (permalink) Old 03-28-2016, 08:15 PM
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I had similar issue, and the opposite issue at times (it wouldn't lock up) with my 97 Mark VIII. My Bluetooth cheapo scanner didn't pick it up, but my XCal2 tuner showed me a TFT error. I replaced it and fiddled around with the connector internally and externally, and it finally went away. I don't think that OBD-I will show an issue with the TFT. I did have blinking OD light in some situations, like OD off and manually selecting second.

--
97 Mark VIII LSC/Silver/Gray leather
97 Cougar 4.6 Sport/White Opalescent Tricoat Metallic /Gray leather down but not out?
89 Cougar LS 3.8/Oxford White/Gray velour/HG need replaced AGAIN
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post #6 of 7 (permalink) Old 03-28-2016, 09:43 PM Thread Starter
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Interesting about the forged crank. I found the 'birth certificate' for the mark and it was 4/23/93, so I kinda doubt it's got any of the early production goodies, but I suppose it's possible. Any way to tell other than pulling the trans?

But yes my mark is a survivor with no rust and it's well looked after. Sadly my old bird had too much rust to be worth fixing. Ran like a top though, the 2v 4.6 is (almost) indestructible.

So where is the TFT located? Does the VB have to be removed?
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post #7 of 7 (permalink) Old 03-29-2016, 12:54 AM
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Legend is the 93 Mk's were the quickest - 93's also known for some Valve Spring failures unlike any others - All the Solenoids are right there when u drop Pan so no need to drop Main VB - I still say I would NOT do anything until your next Fluid change... IF u are lucky enuff to have one - If u have any real fun with it the POS Roller Clutch will die & leave u in 2nd Gear forever - When the day comes u put a REAL 4r70w & nice TC behind that legendary 32V Motor u will quickly realize u have a whole new car.

Check out my Gallery for some ideas when your IMRC's fail (16V aint no fun in a MK) & a pic of my old blown Roller Clutch... etc.

GET OFF MY LAWN~! ... & Let's not forget guys... There's still a dead Imaginary Ex-Girlfriend out there...

Last edited by BUCK; 03-29-2016 at 01:05 AM.
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