View Single Post
heliolps2 heliolps2 is offline
Registered User
Join Date: Jan 2009
Location: DC
Posts: 1,266
Porsche Crest Idle jumping up 200,400 rpms, wires or Permatune CDI problem

Strange thing, for a couple of years now I've been getting this odd idle jump,its not hunting, let me try to explain the best I can, When I start the car it runs fine and idle great, the problem starts after i drive for awhile, when I come to a stop light the idle jumps up from normal idle 200 to 400 rpms with a small violent jump, and lately when the idle jumps it seems to be dieseling as it comes down, it does it, maybe once or twice a drive.

I have checked an rechecked the fuel system and vacuum hoses and intercooler connections, all that stuff looks good,

I have also replaced the spark plugs, The wires are old , from 1999 about 60.000 miles , I have already ordered a set from our host , if that doesn't fix the problem ,I'll have to check my Permatune CDI with built in coil, I may have to replace that also and that not cheap, right now it just a guessing game, it would be good if I had a stock CDI and coil to test with, before i buy a new one.

Can anyone shed some light on the this problem,

1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo

Last edited by heliolps2; 05-15-2012 at 05:43 PM..
Old 05-15-2012, 04:48 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)