Help, Erratic Idle on C280

[benzboy]

Probably has nothing to do with it, but after changing all the fluids yesterday I noticed it has a slightly erratic idle, and stalled a couple of times at lights. Thought it must have been MAS, but replaced that this morning, and it is still there, only seems to do it after coming to a standstill from moving, ar when car is first started up, it bounces from 500 to about 1000 rpm.

Help would be greatly appreciated,
Cheers
Tom

[dono]

Most likely it could be the electronic throttle body, or the harness connected to it. my C36 does it from time to time, but until it fails completely I will not change it. do a search on the topic, and you will find more info that will help you narrow it down.

Regards,

dono

[benzboy]

Got it diaged, its only a vacuum leak, can hear it when you pull throttle cable, gettin it fixed on friday, very happy that its not anything bigger

[dono]

Thanks for the info on the vacuum leak, that is good info to have.

Cheers.

[rollinrealbig]

YUPERZ!!!!



I had the same problem before, there was a vacuum leak in the area where the ECU is, all i had to do is plug it back in - it slipped off of the connector.


made a hissing sound.

[Sulaco]

Where exactly was it slipped off? Where's the ECU?

I'm hoping that's what's wrong with mine too, heh. But I seriously doubt it.

[martattack]

There's a vacuum hose that goes right passed the Oil Filter cap. Make sure that it is connected to the nipple on the intake manifold. I believe that is the same vacuum hose that runs to the transmission cable's vacuum element

[rollinrealbig]

ok, when you open the hood you see the black cover in front close to the cooling fans ? open that cover and it has connections over there - i had to get that connector thing replaced before because over time it dries up and breaks.

ok, the ECU - when you open your hood, look to your top left - all the way in the corner,

there is a three-point connector, ive had to change that one also.

heres pictures,

http://memimage.cardomain.net/member_images/7/web/2179000-2179999/2179797_18_full.jpg http://memimage.cardomain.net/member_images/7/web/2179000-2179999/2179797_19_full.jpg http://memimage.cardomain.net/member_images/7/web/2179000-2179999/2179797_20_full.jpg http://memimage.cardomain.net/member_images/7/web/2179000-2179999/2179797_21_full.jpg

[benzboy]

Might want to clean out some of thoes leaves in that last pic :D

[rollinrealbig]

ya i know ... but a day later my entire car get infested with leaves - all over the place!!!!


... cant help it. Oh-well :D