98 E320 P1580
 

I went and looked at this wagon a few weeks ago briefly and it starts and runs but will not rev up past about 2k, sometimes only about 1500 rpm. I went back ago picked it up today and hauled it home. Only after I got it home and started looking closer it discovered it was actually a 4matic. Anyway car will start and run and will sometimes idle fairly smooth but for the most part idles rough and it will not rev up. I pulled the codes and get P1580 actuator (M33). When I look up M33 in star finder it say its the air pump at the front of the engine. This makes no sense, I think Im looking it up wrong or something. Anyway, what actuator are they talking about? The deal by the brake booster that connects to the pedal cable or something else? Will this cause it to run like crap? I also get a P1187 safety fuel shutoff. After looking closer at car its actually fairly nice with only 170k miles on it.

You need a more detailed code description, just saying " Actuator " does not help.

P1580 Actuator (M33) is all the info that is provided by HHTWIN. It appears it is referencing the throttle body on the back of the intake manifold. I will probably go grab one from the PNP and swap it out.

I posted this in another thread, same rules apply here.

Detailed trouble code descriptions give information as to what the computer is seeing that it does not like. This is critical in forming a diagnostic strategy. Also, some trouble codes are caused by a failure of a part not listed in the trouble code.

I'll use a coolant temp sensor as an example ( I'm not saying that this is what is wrong with your car. )

Here are 7 generic OBD2 trouble codes related to the coolant temp sensor. Not all codes are used on every car.



P0116 could be caused by a stuck open thermostat or low coolant.

P0117 could be caused by the sensing wire being pinched to ground

P0118 could be caused by the sensing wire being broken , tied to power or bad plug contact.

P011B could be caused by an intake air sensor problem or someone leaving a trouble light next to the battery to keep it warm ( if the intake air temp sensor / intake duct is near by it will see a temp above engine temp. )

Somewhere in a factory shop manual there will be a detailed code description. This gives clues as what to test to perform. For coolant temp I'd be hanging a volt meter or scope on the coolant temp sensor wire and watching it.

I dug thru WIS and found the diagnostic data for the trouble codes and it pretty much points to the throttle actuator either being bad or gummed up. This car has apparently been sitting for a while so its possible its gummed up.