'99 Boxster Decelerates, Loses Power

[keithl]

Originally Posted by Lil bastard

Oil fouled plugs due to bad O-rings on plug tubes shorting out the sparkplugs?

This is another possibility.

Pull the plugs and see if the insulators are wet from oil.

Cheers!

PS FWIW, it's helpful to state the mileage on your car when seeking advice.

63000 Miles. Just changed the plugs at 62,000 and there wasn't any oil in there. Fuel filter was changed after the first episode. Thanks.

[ppbon]

Originally Posted by keithl

63000 Miles. Just changed the plugs at 62,000 and there wasn't any oil in there. Fuel filter was changed after the first episode. Thanks.

... in coincidences.
If you replaced the sparkplugs at 62K and now at 63K you have these issues, there has to be a connection.
One of your coils could be not connected properly (but the CEL would have indicated that).
Is your CEL working?
Did you remove/clean the MAF at that time?
Sure sounds like a MAF issue.
Happy Boxstering,
Pedro

[keithl]

Originally Posted by ppbon

... in coincidences.
If you replaced the sparkplugs at 62K and now at 63K you have these issues, there has to be a connection.
One of your coils could be not connected properly (but the CEL would have indicated that).
Is your CEL working?
Did you remove/clean the MAF at that time?
Sure sounds like a MAF issue.
Happy Boxstering,
Pedro

Thanks. I'm only assuming the CEL is working. I have not cleaned the MAF, I will try that. Thanks.

[keithl]

I don't have CEL coming on... do I have to disconnect the battery to clean the MAF sensor? Also, is there a certain mileage that it should just be replaced? thanks

[jhandy]

you dont have to disconnect the battery, just pull the maf. easy way is just to unplug the MAF and drive. if the problem is still there, then it is not the MAF.
Does not hurt to clean it though. you will need tamper proof torx heads.

[rgriffin]

I just had similar problem with my 2001. It would usually run fine, but sometimes I would feel it lose power. When I stepped on gas pedal, no response. sometimes it would die and wouldnt start for a while. No cel lights ever came on, porsche repair shop dumbfounded. Finally died and had towed immediately. Turned out it was the fuel pump. Had it replaced and good ever since.

[keithl]

Originally Posted by rgriffin

I just had similar problem with my 2001. It would usually run fine, but sometimes I would feel it lose power. When I stepped on gas pedal, no response. sometimes it would die and wouldnt start for a while. No cel lights ever came on, porsche repair shop dumbfounded. Finally died and had towed immediately. Turned out it was the fuel pump. Had it replaced and good ever since.

Interesting, I will look into that next. I thought it might be my fuel pump, but never had one work intermittently before. Thanks.