[daly]

My 1993 tiptronic car for quite sometime (like 2-3 years) every once in a while (once a month or two months) will rumble from underneath and almost stall. Pressing on the gas does nothing, it is very quick begins and ends in a few seconds, but car rattles from below and feels like it is going to stall out. The other day it happened and for the first time I noticed that the tiptronic which was in D went from second gear, start position to third gear, without any acceleration, and then felt like it was going to stall out. Once in a while it does stall out, starts right up again. A little disconcerting as you never know when it is going to happen.

Any thoughts?

Thanks

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[oppositelock]

You may be experienceing what is described below. If not, then you will need to have the OBD system checked for trouble codes. Usually this happens when creaping along in traffic and gear selctor in D. When this happens, slap gear selector into N and car will stay running. To combat this, use gear selection 3 around town. This does two things, 1-car takes off in first gear not second and 2-car will not shif into fourth around town. Or use manual shift. Rumbling and stalling seems to occur when creaping along in traffic and I always thought that it was the fuel injection getting confused with throttle position and road speed and cutting off the cylinders for coasting. But you noticed the trans trying to shift to third, which has not been mentioned before, so maybe the trans software is getting confused. No matter if it is FI or trans related, the only known "fix" is the above, unless someone else has figured something else out. Most (all?) tip users have experienced this before.

Mitch

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[94SilverCab]

I know almost nothing about Tips, but could this be a result of the dreaded DME relay failure?



Regards,



Jay

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[rustech]

Does it "rumble" when driving or idling? To me, it sounds like your car is entering transmission "limp mode." When the TCM (Transmission Control Module) senses a fault (or is the fault), it will only allow you to drive around it 3rd (and so the rumble is the motor lagging at low speeds). I have a 6spd, and so can't be much more help unfortunately. Good luck.

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[flash]

i know just enough about these tips to be dangerous, but it sounds to me like the idle control sensor is not having a good time with the trans control module



have you done a blink test yet?

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[Kim]

My tip has done that twice in just over a year. It did it when I started it up. It has never done it when driving. Tapplng the throttle a bit didn't help at all and it stalled. I thought the car might fall apart in the two seconds that it did it. It was also very loud and sounded like it was not coming from the engine. Works perfectly otherwise. I just assumed that it was cold and didn't have enough fuel to run correctly. Now I am curious.

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[gryphon]

I, too, have had this happen once. A restart seemed to cure the problem.



Tom

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[unknown4u]

Me too!.



I have tried to reproduce it.

I disconnected the dme relay. Made a jumper to let the pump run and the idle stabilezer to work properly.

Start the car and disconnected the fuelpump.

The car stalls and when I restarted the car the same error occurs.

After that I switched on the pump again and fired it up again.

No problem.



Tried the first step again. and the error occurs.



So it must be definatly something with the dme relay. Also the warning light from the tip goes on!.



after the restart light went out and stays out.

But when the light is on, the tip shifts like a lorry!.

it clunks trough the gears if it is missing the correct tacho information.







Fitted the dme properly and no faults are registrated and the car fires up fine and runs smoothly as well.



Maybe we have to learn to live with it. <img src="/forum/images/smilies/968/huh.gif" class="smilie" alt="" />

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[968rz]

I like everyone don't know alot of detail on the tip (trying to learn), but one more possable is the TCU feaking out and attempting 2 gears at once (seen it on other cars). My best advice at this time would be to unplug the TCU for an hour or so (that should totaly reset the computer memory). I think it's worth a try, no? <img src="/forum/images/smilies/968/huh.gif" class="smilie" alt="" />

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[daly]

Thanks for the replies.

I had tried the DME change, that did not work.



It sounds like the suggestions are all pretty feasible.



The rumble is from slow speed, stand still, to acceleration, and yes if I react really fast and slap it into neutral or manual mode I can save the stall. I agree that driving either in manual mode or 3 does stop it from happening. It is just annoying to me when everything is not 100%.



The TCM module sounds like a possibility. Resetting the TCU I am not sure about, but if someone wants to tell me where it is and what to do I will give it a try.

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[unknown4u]

Daly, Does the idle stabilisor works correctly? Because if the car runs in neutral about 900 rpm, if you shift into drive it will stall if the stabilizer will not work. What will happen when you swith the AC on? will it rumble also or is the the revounter about a 1000 rpm??? If it is at 1000 rpm will it still stall when you shift into drive??



The idle stabilizor gets his voltage from the DME relay.

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[968rz]

[quote name='daly' post='37530' date='Jun 27 2007, 12:55 PM']The TCM module sounds like a possibility. Resetting the TCU I am not sure about, but if someone wants to tell me where it is and what to do I will give it a try.[/quote]

I was reffering to the tranny computer, pulling the plug for awhile should erase the memory. Something to try anyway.

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[daly]

[quote name='968rz' post='37614' date='Jun 28 2007, 10:34 PM']I was reffering to the tranny computer, pulling the plug for awhile should erase the memory. Something to try anyway.[/quote]



Okay, where is the plug to pull you are referring to?

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[968rz]

I have never had to do it to my 968 but according to my docs the computer should be in the "Right Rear Fender" and if the docs are right it should only have one plug.

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[unknown4u]

correct!. and there was a recall for in the past.

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[rustech]

As is the case with my Audi TT, recalls in Europe don't always apply to the US because too few are sold here (how unethical is that?) Regarding disconnecting the TCM, I'm confused as to 1. what this is supposed to do, and if it did something, 2. why not just disconnect the battery?

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[oppositelock]

Recall!?!?! Cool, any further info? Disconnecting the batter for several minutes will have the same effect. The engine computer and the transmission computer will be reset and have to "relearn" the way you drive. It may not solve anything, but does not hurt anything either. Your engine will run very poorly until you drive it. Mitch

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[968rz]

[quote name='rustech' post='37805' date='Jul 3 2007, 10:08 PM']Regarding disconnecting the TCM, I'm confused as to 1. what this is supposed to do, and if it did something, 2. why not just disconnect the battery?[/quote]

Opposite is correct; the reason I suggested un-plugging the Trans computer only is so the engine computer doesn't lose it's memory, as well as the radio and such (also that will not anger the air bag light gods <img src="/forum/images/smilies/968/wink.gif" class="smilie" alt="" /> )

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