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CEL after changing Coolant Expansion Tank

allenh5
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allenh5 Member

allenh5

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Changed out my coolant expansion tank....not too much trouble (after getting the old unit out). Installed the new one, filled and fired it up for a leak check. One small leak, decided to wait until the next day to search for that leak. Next day I removed the air unit to do a visual on the hoses and make sure they were all dry prior to starting the engine. Went inside and then heard my car start, (had a friend over) the friend had decided to start the car with the air unit not installed, but sitting on the back lip. MAF was still connected but not unit was not connected to the throttle body.

I shut the engine off, installed the air unit and started the car. CEL......engine running rough (like a vacuum leak). Don't have a durametric tester, but thought I would start simple, clean the MAF, clean the throttle body, and do a visual for any hoses that may not be connected.

Any other simple suggestions before I get a durametric and check the codes?

edit: '01 C2 Cab Tiptronic

Edited by allenh5
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allenh5 Member

allenh5

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No fault codes yet, 2nd Porsche and have never had a CEL....so am just now having to buy/borrow one.

The secondary air pump is plugged in, however the first time I started the car, I didn't have the air hose connected and it idled about 30 seconds until I noticed it. Could that have thrown something out of whack?

Fault code(s)?

Double check your secondary air pump electrical connection - easy to forget to plug back in.

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allenh5 Member

allenh5

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Once again, Loren to the rescue.

Cleaned the MAF, cleaned the throttle body hooked everything back up, running like a new car.

Drove it to and from dinner last night with the CEL on, started it this morning, no CEL and been running like a top all day with no CEL and no other issues.

Another DONATION COMING NOW!!!

If that is the case then the CEL should clear on its own - after a number drive cycles.

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