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View Full Version : Please help...my BMW will not go over 30mph!

marksmusic
08-19-2008, 09:49 AM
My dad just replaced the o-rings and gaskets on this huge motor and now that it's all put back together, it does NOT go over 2000 RPMs / 30mph... can anyone please help me with this? Thanks so much. It's a 1990 750IL.
TerryY
08-19-2008, 11:28 AM
You are probably in Limp Home mode. That means that one bank of cylinders is not firing and is dragging down the other 6 cylinders.

Look here http://www.e38.org/e32/

And here http://bmwe32.masscom.net/

What O-rings and Gaskets were replaced?
marksmusic
08-19-2008, 02:30 PM
nearly all of them were replaced in the motor....
marksmusic
08-19-2008, 02:32 PM
How do you fix this problem?
TerryY
08-19-2008, 02:37 PM
Check that the sensors on the number 6 and 12 cylinder spark plug wires are plugged in correctly and the spark plug wires are secure.

Check the wires from the coil to the distributors are secure on both ends.

If the timing cover gaskets were changed -check the connections to the crank position sensors and DK motors are all secure.
TerryY
08-19-2008, 03:04 PM
Also check the connections to the air flow sensors on the intakes.

Remember that the air flow sensor and the DK throttle motor are on the opposite side of the engine from the cylinders that they feed.
marksmusic
08-20-2008, 08:09 AM
The EML light comes on as well..... also, we've unhooked the battery overnight (must have reset something) because the next morning it ran like a champ, but after turning it off and restarting it was back to the old problem.... any suggestions?
marksmusic
08-23-2008, 02:58 PM
EML light does not go out...we changed the battery but still didn't fix the problem.... please help???
TerryY
08-23-2008, 07:31 PM
Have you checked the things that I listed?
Corey Milne
09-19-2008, 04:07 PM
My advice, take it to a certified bmw tech, not your dad :)
marksmusic
10-16-2008, 03:03 PM
I took it to a bmw tech and he couldn't figure it out either...well, without spending over 4000 dollars in parts and labor!!!! THE EML LIGHT IS ON, BUT HE SHOWED ME HOW TO TRIP THE COMPUTER BY REMOVING THE #20 EML FUSE, THEN UNHOOKING THE #2 OR #3 COMPUTER MODULE ON THE OPPOSITE SIDE OF THE FUSEBOX. THIS WORKS SOMETIMES BUT NOT ALL THE TIME. EACH MODULE THAT NEEDS REPLACED COST $1000, $4K TOTAL.... IS THERE ANY WAY AROUND THIS THAT ANYONE KNOWS OF?
marksmusic
10-16-2008, 04:09 PM
Eml light is constantly on, even when the key is out of ignition...how can i get this light to go off???