Poor accelration - PeachParts Mercedes-Benz Forum

JamesDean · #1 09-02-2014, 11:41 AM

Aye, idle on these cannot be adjusted it is electronically controlled via the IACV.

You can introduce vacuum leaks or disrupt the control system and cause an idle change.

A common one is a 1500 RPM idle due to a broken or non-contacting throttle micro-switch.

I would set the lambda tower to 40-50% duty cycle as measured by the X11 port's pin 2/3.

EHA should be set by fuel pressure gauge set. I can't remember the number though.

Once you get those set and you still have an idle problem then I'd suggest trying to find the vacuum leak.

Frank Reiner · #2 09-02-2014, 12:28 PM

Quote:

Originally Posted by JamesDean

Once you get those set and you still have an idle problem then I'd suggest trying to find the vacuum leak.

Actually, the air leaks must be eliminated before any adjustments to fuel controls are made, otherwise the feedback of exhaust oxygen content will cause the ECU, via the EHA, to attempt to self correct the mixture. See comments of pmckechnie, above.

JamesDean · #3 09-02-2014, 01:18 PM

Quote:

Originally Posted by Frank Reiner

Actually, the air leaks must be eliminated before any adjustments to fuel controls are made, otherwise the feedback of exhaust oxygen content will cause the ECU, via the EHA, to attempt to self correct the mixture. See comments of pmckechnie, above.

aye, backwards I am.

Fix the physical mechanical issues, then adjust the electricals.