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CEL Codes, cold start only - seems (?) like an odd mix?


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2001 Cabriolet, Tiptronic.

 

Got a whole handful of codes today after the car had sat for five hours in Florida shade - maybe not a 100% cold start, but not anywhere near temperature.

 

Notably, the secondary air pump did not come on.

 

New Beru coil packs and Bosch plugs all around. Start up / idle RPM only: 600 - 1,100 rpm.

 

Based on my searches only, it seems I'm looking at two different things - the secondary air pump and 1128, 1130 can be connected to the misfire codes. Lots of threads here just on those codes by themselves.

 

But the 1341, too, on cold start, well under 3,000 rpm? I mean, good threads here too on troubleshooting that for electrical, DME, solenoid, or actuator,

 

But to get all these at the same time? Am I ignorantly looking for some correlation between cause and effect that may or may not exist?

 

 

 

P1341
Porsche fault code 174 - Camshaft adjustment bank 1 below limit value

 

P0300
Porsche fault code 62 - Misfire damaging to cat. converter

 

P0301
Porsche fault code 63 - Cylinder 1 misfire damaging to cat. converter

 

P1128
Porsche fault code 360 - Oxygen sensing adaptation idle range bank 1

 

P1130
Porsche fault code 361 - Oxygen sensing adaptation idle range bank 2

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Possible causes:

– Incorrect signal from MAF sensor
– Intake air system leaking
– Fuel pressure too low
– Volume supply of fuel pump too low
– Fuel injectors fouled
– Exhaust system leaking

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Thanks, Loren - per other threads here, I've cleaned the MAF sensor and checked its actual values via the Durametric (V did increase with RPM, as expected), and I've run a tank of Techron to see if I could cheat and easily clean the injectors. New fuel filter, too.

 

None of which are dispositive on those issues, though, of course, and I haven't done anything to test fuel pressure or flow rate or for intake air leaks, but

 

Next place I will look is the exhaust, because I took the mufflers out when I did the coils and plugs, and these codes weren't happening before. Simplest explanation might be the most likely, if I didn't button up the exhaust properly, there you go. 

 

Regardless, I suppose there's no alternative to methodical and systematic troubleshooting, so thank you for the list!

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