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H!

 

I have an 996 - 99mod manual 3,4L.

 

When i start up it seems like it misfires. It`s kind of a knocking sound. Sometimes it stops on idle.

When i push the throttle for a ouple of seconds, it smokes a lot and then the knocking goes away. 

After that, I let it Idle - but it slowly rises from 800rpm to around 2000rpm, then it drops to 800rpm again and do the same thing over and over again,

 

Does anybody have a clue?

 

This is the fault codes i found:

 

P1601  -CAN timeout - instrument cluster

P0600 - CAN timeout Tiptronic

P0102 Hot film MAF sensor (erased and didn`t come back)

 

 

60 - Central locking limit pos

13 - Left door secured, but not locket

14 - Left door secured, but not locket

16 - Signal from airbag

1 - Doors secures and terminal 15 on

43 - passenger - side release stuck

44 - Driver-side release stuck

61 - Central locking limit position Unlock not reached

 

 

 

 

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It's been reported that these cars will show up with several anomalies like yours when the ignition switch is failing/about to fail.

I don't encourage throwing parts at a problem until it goes away, but at the price of a replacement switch, it's a "start". I keep a spare switch in my car: it failed once before and stranded me.

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I had similar symptoms with my 2000 boxster but the codes were 1128 and 1130,so this may not help you but it did fix my issues.

I will add that I replaced the MAF twice with no success until I read that the fuel filter could be the issue.

Well, I replaced the fuel filter, the MAF and added Techron to the gas then I cleared all the faulty codes, disconnected the battery for 5 minutes and started the car, It coughed for a few times then started fine...I have to add that it has been really cold here in Colorado so I was expecting a rough start. I drove the car today (Dec 13) to work with no issues and no error codes. I learned that provably the gas filter was not allowing enough gas to start the car in cold. Cheers

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