Electronic control module????help

[JFP in PA]

Something is peculiar here, a 99 Boxster should carry a 5.2.2 DME, but some of these codes are for the 7.2 DME, which is from a 01-02 "S" model Boxster.

That said, P1124 and 1126 are O2 sensor (both banks are lean); P0446 and 0455 are EVAP system codes (massive vacuum leak in EVAP system); P1313 to P1319 are cylinder misfire codes.

Considering the EVAP system leak codes, the O2 sensor codes make sense; the misfire codes may also relate to the lean conditions.

[Jager]

This could be a fun one... You need to verify the electronics. Remove the trunk front panel by removing the three plastic retainers and pull back the carpet to expose the control module. How many connectors does it have? The DME 5.2.2 has a 88-pin connector and the DME 7.2 has 5 connectors (A 9-pin, B 24-pin, C 52-pin, D 40-pin, E 9-pin. I would be very surprised if someone upgraded the system to a 7.2 DME.

After changing the plugs do an AOS test by taking the oil fill cap off while the engine is running and warmed-up. Is the oil fill cap hard to take off? Does the idle drop where the motor almost dies?

[wannagofast]

Just got thru with left side spark plugs now working on right side. After all this I will check which DME is in the car??? I will let you know my findings.....

[Jager]

So you are going to replace the tube seals later?

[JFP in PA]

Just out of curiosity, with codes showing a large scale vacuum leak at the EVAP system, and O2 sensors saying overly lean (like if you have a vacuum leak); why are you looking at the plugs instead of checking out the EVAP system?

[wannagofast]

Well, at this point in time when we sat down to figure out what we could do to make the car run better we figured we would change the spark plugs at the same time we also purchased a OBD II code reader to really see for ourselves what was going on??? The shops or dealer is too expensive right now so we are resorting to our old mechanic days working on our MOPARS LOL and see what we can do... I do have another question for you how can do you wash the motor off to wash away oil etc to start fresh to see any real oil leaks etc. kinda difficult under????

[Jager]

Originally Posted by wannagofast

Well, at this point in time when we sat down to figure out what we could do to make the car run better we figured we would change the spark plugs at the same time we also purchased a OBD II code reader to really see for ourselves what was going on??? The shops or dealer is too expensive right now so we are resorting to our old mechanic days working on our MOPARS LOL and see what we can do... I do have another question for you how can do you wash the motor off to wash away oil etc to start fresh to see any real oil leaks etc. kinda difficult under????

How did the old plugs look? Was there still signs of an electrode on the end?

[Jager]

Looks like there are multiple issues, Wanagofast just discovered oil in the spark plug tubes (he sent me a PM this morning), so that is one issue. Will tackle vacuum leak(s) next.

[wannagofast]

Yah, we started the car just to see how it ran just with that right side done and it already seems to be a happier car...Yah, we are going to replace the tubes later those tubes need to be ordered I assume, it didnt misfire presently. We sprayed WD-40 on the plug to keep any oil off of them and dried out the tube best we could.