Intermitten RPM surging - PeachParts Mercedes-Benz Forum

oso · #1 02-28-2011, 10:00 AM

Quote:

Originally Posted by babymog

Unplug the ELR (two-pin connector on the back of the IP) and see if it still occurs.

Does the tach act up at the same time?

I did unplug the ELR a couple of times to test it's effect and it looks like we got a winner- how do I go about fixing whatever needs fixing?

winmutt · #2 02-28-2011, 10:42 AM

Quote:

Originally Posted by oso

I did unplug the ELR a couple of times to test it's effect and it looks like we got a winner- how do I go about fixing whatever needs fixing?

http://startekinfo.com/StarTek/outside/11832/Resources/201Create/PDF/70006.pdf

Section 7.1.190 is a complete breakdown of testing the EDS/P2 with generally easy to find tools (other than an scope which can be purchased cheaply enough).

oso · #3 02-28-2011, 11:47 AM

Quote:

Originally Posted by winmutt

http://startekinfo.com/StarTek/outside/11832/Resources/201Create/PDF/70006.pdf

Section 7.1.190 is a complete breakdown of testing the EDS/P2 with generally easy to find tools (other than an scope which can be purchased cheaply enough).

Wow! Now I just have to enroll in some kind of engineering program at the junior college and everything will be peachy... The link is great!! Thanks winmutt, appreciate your help.

Alex300DT · #4 02-28-2011, 10:42 AM

I just fixed the same problem on my car, the wires in the harness were rubbing against the intake manifold. Look where the harness snakes around the manifold, you might have to dissect it, separate the wires, and reinsulate the whole thing.

oso · #5 03-01-2011, 08:57 AM

Quote:

Originally Posted by Alex300DT

I just fixed the same problem on my car, the wires in the harness were rubbing against the intake manifold. Look where the harness snakes around the manifold, you might have to dissect it, separate the wires, and reinsulate the whole thing.

Alex300DT- you deserve your moniker! Today the car was really acting up and so that gave me a chance to try your advice and it seems to have worked!!! I have simply pushed the harness up and away from the body of the IP so it was truly suspended in the air between the intake manifold and the IP and the surging went away. Had to go to work so did not have a chance to mess with it as much as I would have liked but things are looking up! Something in the harness must not be OK so I will have to take a closer look. Thanks again - what a great forum!