Main Menu

Engine misfire on all bank 1 cylinders with lifter rattle.

  • 1999
  • Boxster
Mileage: 
155 000
Engine
Dallas, 
Texas

I have a 99 Boxster 2.5L with 150,000 (IMS bearing upgrade already done).  It misfires on the passanger side. P001 p002 p003 are the codes I am getting. Also, if I hold the throttle for a second or two, past 1200 rpm, I get this loud rattle/ clatter noise. NOT rod knock but maybe a few bad lifters? It won't do it if I blip the throttle, but only when I hold it. Here are a list of things I have replaced to try and fix the misfiring. 

1. Spark plugs

2. MAF sensor

3. O2 sensors ALL 4

I have checked the coil packs and all are working. I am thinking theres is a bad sensor that is not allowing the passanger side to have any ignition spark because it is three cylinders in a row, not one or two at random. Does anyone have any suggestions? Cam angle sensor? Vario cam sensor? Bad connections? I have read almost every fourm with similar issues, but none of them really line up. Open to any ideas.  Thanks for any counsel you can give.  First time Porsche owner.

You must log in to view answers associated with technical questions. Join PCA to participate in our community.
0
No votes yet