Funny surge / choppy throttle at highway speeds. - PeachParts Mercedes-Benz Forum

Jetmugg · #1 03-01-2014, 01:16 PM

My OM602 Turbo powered '93 190 has developed a strange throttle response condition.

This has been going on for a couple of months (at least). It's driveable, but annoying.

When accelerating through up to about 2500 rpm's, the acceleration seems a bit "soft", but then really starts to come on strong at 2500 rpms (like a surge of power).

The issue I'm having, though, is that at 2500 rpm or above, decreasing pressure on the accelerator pedal even slightly causes a sudden and very noticeable drop in power. It's like having an on/off switch for an accelerator, as opposed to the continuously variable control it is supposed to have.

I have checked and lubricated the linkage on the IP. I do not believe the problem is in the linkage.

I think it's more likely an ALDA and/or rack problem inside the pump, but don't have a good idea how to begin troubleshooting so that I can identify the root cause.

As always, any help would be appreciated.

Steve.

Jetmugg · #2 03-03-2014, 11:15 AM

I realize this is an odd-ball problem, just hoping for some suggestions regarding possible causes.

Steve.