w202 merc c230 idling not revving up

**frikki** · 8th November, 2014, 09:27 PM

hi there dear members. I have a Mercedes w202 c230 compressor. vin nr. adb2020246f690086 engine nr. 11197560009429. vehicle initially had key problems. has been standing for 6 months. add fresh fuel. after key were fixed, vehicle started and revved up, after a few starts the vehicle refused to pick up the revs. car idling fine. changed fuel pump and filter. fuel pressure around 3.5 bar at fuel rail. scanned vehicle, only brake light switch fault. unplugged airflow sensor, no difference and no idling. removed injectors, had them tested all fine. airflow sensor life data shows fine, friend scanned car using star. intake air temp fine, coolant temp fine. changed fuel pressure regulator. checked all fuses. fine. could some kind member please advise on what else I can check on car. many thanks in advance. keep well.

**autoden** · 9th November, 2014, 01:16 PM

"add fresh fuel" mmm I wonder!

**frikki** · 9th November, 2014, 06:18 PM

Originally Posted by autoden

"add fresh fuel" mmm I wonder!

yes my friend. there were very little fuel in the vehicle. not much to talk about. added a couple of hundred bucks of fuel. also I need to mention, that when I blank off the return fuel pipe, the pressure jumps to around 7bar. the vehicle then revs up to about 4000 rpm. and when I throw a little fuel down the throttle car revs up for a little period when accelerating. any advise will be appreciated. thanks

**Meat-Head** · 9th November, 2014, 07:07 PM

Is the butterfly valve seized up.

look at codecard for throttle drivers.

can you tell ecu it has a 'new' throttle valve

**frikki** · 9th November, 2014, 09:46 PM

Originally Posted by Meat-Head

Is the butterfly valve seized up.

look at codecard for throttle drivers.

can you tell ecu it has a 'new' throttle valve

throttle valve still original. when accelerating butterfly does move to open position. thank you.

**Meat-Head** · 9th November, 2014, 10:24 PM

Huh!?!? Chuck a set of spark plugs in see what happens. See it on a cowboy film, John Wayne had a horse doing something like, new sparkplugs and it then won the Grand National!!

**gttuning** · 9th November, 2014, 11:21 PM

John Wine had a VR6

**Meat-Head** · 9th November, 2014, 11:51 PM

Originally Posted by gttuning

John Wine had a VR6

Oh are you sure? Thought it was a flat four?

Unless that film you watched with a VR6 was a cop version.

Is this screen shot from the film your thinking of?

**frikki** · 10th November, 2014, 07:01 AM

Originally Posted by Meat-Head

Huh!?!? Chuck a set of spark plugs in see what happens. See it on a cowboy film, John Wayne had a horse doing something like, new sparkplugs and it then won the Grand National!!

. I did fit another set of plugs. still the same results. could a faulty brake light switch have anything to do with the problem maybe. thank yoy.

**Meat-Head** · 10th November, 2014, 08:56 AM

Ah yes but would expect to rev stood still. Replace switch if cheap enough. Retards engine when braking .

**frikki** · 10th November, 2014, 09:24 PM

Originally Posted by Meat-Head

Ah yes but would expect to rev stood still. Replace switch if cheap enough. Retards engine when braking .

hi. pulled out switch. bridged out wires going to ecu. fault code gone. vehicle still doing the same thing. any other suggestions friend. thanks. keep well.

**potrobber** · 10th November, 2014, 09:31 PM

Does bridging out the wires as you say not let the ecu think that brakes is pushed so will cut power to engine?

If you have a brake light switch fault replace the switch and see what happens is this not a 4 wire switch?

**gttuning** · 10th November, 2014, 11:18 PM

Originally Posted by frikki

hi. pulled out switch. bridged out wires going to ecu. fault code gone. vehicle still doing the same thing. any other suggestions friend. thanks. keep well.

yep give it to a good mechanic

just joking.
did you check live data to see what throttle sensor is showing when you press to the floor?

**frikki** · 11th November, 2014, 06:01 AM

Originally Posted by potrobber

Does bridging out the wires as you say not let the ecu think that brakes is pushed so will cut power to engine?

If you have a brake light switch fault replace the switch and see what happens is this not a 4 wire switch?

hi. when switch is in resting position, the plates within the switch are bridged(close circuit), sending info to the ecu that the pedal is not pressed. circuit for brake lights is open circuit when brake pedal is in resting position. becomes closed circuit when pressed. thanks. all faults codes are gone from ecu. thanks.