This is a 98 s320 , I recently did the head gasket to fix oil leaks
.. drove it a few blocks and it died , finally got it to restart ... and pulled into auto parts store to read codes ... after checking codes engine revved up and down .. And wont accelerate.. after checking several connectors , I try one last time , and it's running somewhat normal ... so I drive her home, I try again to start it and I'm back like before ... un drivable reving up and down ... 1580 and 0100 codes ... idle control , and maf ... also a have a bas asr light comes on while it's not running right ..

Where should I start? Should I remove and clean Valve body ?

Thank you

Unplug the MAF when it is acting up, let it go into limp and see if that is better. Also OBD2 codes are very specific as to the fault condition, they don't just say idle control , and maf . Look up the detailed description as this helps diagnosis and shows you are taking an active role in fixing the car Vs " internet, tell me what is wrong."

What else can I check ?
I did try unplugging maf , not only continued to rev up and down , it runs worst , almost back fire while reving up and down and runs better w MAF connected , also I swapped in my spare MAF , and it's the same , also I have zero throttle response... I did researched these codes , and from what I've learned I must have an issue with the thottle body and wiring harness , or both .... I'm am taking active role fixing the car ... this car has sentimental value, so that's why I did the head gasket to begin with ...

Unplugged maf and it runs worst, I guess I figure this thing on my own... and update

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.

Also to address this. Are you sure you got the camshaft timing correct when reassembling the engine?