2003 MB C240 Fuse #65

Hi Frank:

Thanks for the advise, Where is the Air pump and what does it do?

Would this result in the engine not starting?

I have had two incident that it took many try for the engin to start.

Thanks again for your help.

Bijan

The air pump is there to blow air in the exhaust while the engine is cold and during a restart to help the catalytic convertor heat up faster or burn the excess fuel during therestart. The pump is either in the front center of the engine or right front of engine compartment. The two incidents where the engine wouldn't start may have been intermittant failures of the crank position sensor (code PO335). The engine needs this signal to run.

Hi all:

Well the worst happened and car died on the ramp to Lincoln tunel to Newyork.

Towing, car rental, extra night hotel, $$$, and it was the Crank Shaft Poition Sensor Code #P0335.

If you see it, don't ignor it, FIX IT.

I am in process of changing the AIR pump now.

Will report back.

Bijan

Hi all:

Well the worst happened and car died on the ramp to Lincoln tunel to Newyork.

Towing, car rental, extra night hotel, $$$, and it was the Crank Shaft Poition Sensor Code #P0335.

If you see it, don't ignor it, FIX IT.

I am in process of changing the AIR pump now.

Will report back.

Bijan

If you will post your vin number I will try to help you if I can.

Is emissions stuff...

Code (PO410) causes a safe mode.

A secondary air pump code, the supercharger acts as the pump to heat the catalytic converter during warm up.

Remove the hose between the vacuum solenoid, and check valve (the secondary air injection circuit starts just before the throttle body with an appx. 1" hose), start the car and verify that the solenoid was opening for a minute or so, then closing. Then attempt to blow through the check valve into the exhaust. Remove and install new check valve and reset the cel. Note; the check valve is a pain to remove since it is located between the engine and firewall, threaded (rusted) on and basically part of the exhaust system.

The Denso part appears to be #300. The brass looking check valve downstream is #250.

the (dealer) parts guy had the Denso part at $85 and the brass one at $86

Duval in FL. generally has the lowest prices.Their part number for #300 is different than the Denso-labelled unit.

P/N's:

200 1111403612 001 INTAKE LINE AT CYLINDER CRANKCASE
210 910143008000 001 SCREW AIR INJECTION LINE TO CYLINDER HEAD M8X16
220 910143006000 001 SCREW AIR INJECTION LINE TO CYLINDER CRANK- CASE M6X12
230 915036018103 001 HOLLOW SCREW AIR INJECTION LINE TO CYLINDER CRANK- CASE
235 007603022100 002 SEAL RING AIR INJECTION LINE TO CYLINDER CRANK- CASE
235 007603022100 001 SEAL RING AIR INJECTION LINE TO CHECK VALVE
250 A0021402860 0021406860 - VALVE *006
250 0021406860 001 VALVE (CHECK VALVE)
260 1112381382 001 HOSE FROM SHUT-OFF VALVE TO CHECK VALVE
270 0069973990 001 CLAMP FROM SHUT-OFF VALVE TO CHECK VALVE
270 0069973990 002 CLAMP FROM THROTTLE HOUSING TO AIR SHUT-OFF VALVE
280 000000000812 001 CLAMP HOSE TO BRACKET N 16016-B RS 27/ 15
290 910112006003 001 NUT HOSE TO BRACKET M6
300 0021405560 001 VALVE (SHUT-OFF VALVE)
310 1112381282 001 HOSE FROM THROTTLE HOUSING TO AIR SHUT-OFF VALVE

That #3 part looks to be

003 P/N 0025401497 001 VALVE AIR BLOW-IN ELECTRIC CHANGE-OVER VALVE

http://www.detali.ru/cat/oem_mb2.asp...SGR=120&SGN=04