pesky CEL

[angelina]

I have a 2002 boxster S, 60,000km on the car and 20,000km on the new porsche installed motor. I keep getting CEL 1128 1130; I replaced the MAF and the CEL came back . I had a modified stock exhaust ,I put the stock one back on thinking maybe I dont have enough back pressure. Next day CEL 1128/1130 came back on. I took the car to the local indy and had it smoke bombed,and checked with their Pwis Porsche diagronistic system the result ,No Vac leak and everything checked out perfect. I did have a pending code which I think was 0105 throttle at idle limit. The indy told me that code was related to the 1128/1130 CEL. The indy told me maybe its an internal mechanical pro blem and he hears a slight ticking during warm up.{sounds normal to me} .The car runs like a top the only wierd thing is a slight stumble at idle for the first 10 seconds. My code reader gives freeze frame data, I read that the data is stored when the CEL is put on . If thats true my motor was at idle,and warmed up and the sftf shows 22%+. Any Idea's Guys ,I

[Chris_in_NH]

why do people automatically replace the MAF for 1128/1130 codes? if you do any reading on here, you'll see that a new MAF usually doesn't solve these codes.

if the Air-Oil Separator (AOS) was not changed with the engine, check your AOS bellows tube. that is the most common (vac leak) cause of 1128/1130. change the AOS proactively and see if your code goes away. it's a lot cheaper than a new MAF, and the AOS is destined for failure eventually.

[Stefan]

Since you have had the exhaust modified (even though it was put back) I suspect that first. A leak in the exhaust system would cause these codes.

I'm not sure what code you mean by 0105. Perhaps you mean P0506 ("Idle Air Control - Engine speed too low") in which case you should check your air filter.

In any case you might want to try running a bottle of Techron fuel system cleaner through the system.