vyper144

Okay, so I have a really, really decent 1993 Mercury Grand Marquis LS. But, as with every car there are issues with it.

First, the trans seems like it is slipping, I will lose all accelerating power for a few seconds. I will try to explain the problem as detailed as possible. When I start the car, it immediately starts to rev up. I haven't figured out why yet. I shift it into drive and it 'jumps' pretty badly. And while I am driving, I will feel it start to jump again. I put my foot to the floor and it continues to jump. It only happens for a few seconds. I put my OBD-I reader to the car and it came up with KOER code 411 which is "Cannot control RPMs during low RPM check". Somehow, I think the code has something to do with the trans. Any ideas?

Second, when I have the heat on, I turn it to just the floor and it wont blow out on the floor. If I want to have it on the floor I have to use Defroster / Floor. Any ideas?

Third, the previous owner had an aftermarket vinyl top AND moonroof installed. I tried contacting the manufacturer of the moonroof(Webasto) and their customer service SUCKS! Does anyone else have an aftermarket sunroof installed on their car? And would it happen to be a Webasto Starlite
5?

Fourth, my cruise control just stopped working today too. I used it last weekday too. I used it last week to drive 180+ miles and it worked perfectly. On the trip home it wouldn't work. I checked the fuse inside the car and it is still in tact. Any ideas?

I would really appreciate ANY ideas or tips that you have for me!!! My MGM is a really decent car and in good shape, but it does have it's problems that I would like to fix.

Thanks!
David

Steve83

Sounds like the trans is dying. My '94 did the same thing just before it totally quit on me. I had the trans rebuilt, and then blew the engine, so I have a fresh (~4 years ago, but only ~1,000 miles) AODE with a new TC sitting in my garage that I'd love to sell. Where are you?

The high idle sounds like a vacuum leak or stuck IAC. Read this & the NEXT:


The floor heat also sounds like a vacuum leak, but within the HVAC system.

Does the car still have a red SCDS under the brake booster? Was the recall performed?

. .

__________________
Walk softly & carry a BIG SIX ! ! !

. . . '99 CV RIP

vyper144

Sorry, but can you dumb it down a little bit? AODE, TC, IAC, SCDS? I am just learning things about cars since I have had one only since September and the knowledge is coming to me whenever I need to work on a specific part.

Steve83

No, I can't. Bone up or pay a pro.

Automotive Terms & Abbreviations

__________________
Walk softly & carry a BIG SIX ! ! !

. . . '99 CV RIP

vyper144

I meant the acronyms...

jwko

AODE = Automatic Over Drive Electronic Transmission

TC = Torque Converter

IAC = Idle Air Control Valve

SCDS = Speed Control Deactivation Switch