whats the problem with my 500?

*Sept 2009* i have since scrapped this car, had the engine rebuilt and fitted with a K jet manifold (removed KE jet) as it will soon go into my Gwagen.
*Initial post* help! whats the matter with my 1988 UK 500sel. after acceleration, when you back off and then hold the accelerator, the rpms 'bounce' and its audible in the car. if you accelerate or take foot off, it goes away. anyone know the problem?? thanks

Category:

Autos & Vehicles

Tags:

• mercedes
• w126
• 500sel
• engine
• litre
• v8

[RasterHacker]

Same prob here did you fix it?

[w116036]

nah mate, though some good responses in these comments. in the end my mechanic rebuilt the whole thing and replace the KE jet manifold with a K jet manifold. it will soon be going in my 1983 G wagen. regards

[jason19on81tour]

@ w123boy please stop talkin such an bullshit

it is not the timing chain,i guess it´s the relais for the ecu

[w116036]

thanks Jas for input. i still havent fixed this bloody problem. i dont think timing chain either as wouldnt it be at all engine revs? i reckon its also electrical. the engine will be coming out of the car soon for a rebuild, maybe something mechanical will show up then!

[straight2hell666]

I kno how to solve this if u r interested... I lowered the RPM of mine to 500 to 450 Rpm Idle... plz pm me

[w116036]

heh S2H, the mechanic tried lowering the fuel mixture. its didnt fix the problem but often stalled out! as i nioted, i think its coz someone chopped the heck out of the cats. regardless, i bought another 500 and am going to fit K jet (not the KE) to eliminate this system!

[tuny41]

Sanayiye Göstert Bence

[ubuntunoobz]

@w123boy your retarded....

[gixerthou57]

dich the k jet, get megasquirt, let all the horses out to play

[mercedesbenzformula1]

You Scrapped It!?!?!?!?!?!

[straight2hell666]

propably it was a 30€ piece: the overvoltage protection relais. This causes high rpm and bad response form the engine. Its controll unit is then switched off...

[viggoM35]

+1 on the idle control valve (ICV) could be getting stuck or receiving a poor signal from your intake air temperature sensor (IAT)

[ciller1985]

sounds like your driving on a flat tire

[drewprof]

The OVP could be a problem but also check your air flow meter's potentiometer. If the OVP is bad the ICV will force the car to idle high, so sometimes just replacing the ICV isn't going to solve this problem.

Also, make sure you check all of your vacuum lines for cracks.

Good luck!