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This week I have been struggling with a intermittent starting issue on my 1997 boxster 5 speed. I replaced the ignition switch battery and clutch switch in hopes that it was something easy. With no effect on my part I decided to let my local dealer fuss with it. $200 later my problem has been diagnosed as the dreaded immobilizer being wet. I. Got a quote of $3600 parts and labor to remedy the problem and it seems foolish to put over half the cars value into repairs. My quest for posting today is to look for more wallet friendly ways of repairing or replacing the immobilizer.
I will buy a waterproof cpu case and look into roof leaks while the unit is out.
Good afternoon all,
This is my first post but want to start by thanking all who have shared there knowledge on other posts as it has allowed me to fix various items on my car.
looking for assistance before i take the car to the dealer. i think it is down to the mobilizer but not sure if there is something easy i am over looking.
currently have a no start / no crank condition. when i pulled the car out of winter storage it would crank slow but not start.
1) Replaced the battery, still no start. Then turned into no crank.
2) Replaced ignition switch, started and ran for 10 -15 minutes; but would not restart.
3) Have 12V to pin 30 of the starter relay when key turned to start. And if i short pin 85 (from DME) to ground it cranks but wont start.
4) Replaced Starter relay with a new one. Will "click" when key turned but not hold.
5) swapped the DME relay with another one. (read a post somewhere that this fixed a similar issue for someone)
6) bypassed clutch switch
7) very occasionally (1 out of 40 to 50 tries) car will fire up. this may coincide with having the battery disconnected for 30+ min first but is not guaranteed.
? removed the control unit under the seat and when open appears to be in good condition, no moisture / corrosion. 15 amp fuse confirmed good.
9) checked all fuses in driver foot well, no issues found.
have tried both keys with the same results.
At this point i think either the immobilizer or ECU are the problem but do not have an appropriate scan tool for either of these.
can any of you recommend something i should try before going to the dealer?
By Stephen Semenchuk
Looking for suggestions. I replaced both fuel pumps of my 2005 Cayenne Turbo after the main pump died. Got it all connected back up and she runs great.... until it gets down to a bit under a quarter tank. Sometimes the engine just quits, other times the throttle gets intermittently rough, it shudders however, if I feather the gas lightly, it will continue to drive, if I press harder on the gas, it stalls. When I pull over and restart it, it drives fine for about a mile or so then same thing. Has anyone experienced this after replacing the fuel pumps? Is there an installation “gotcha” that I missed? Thanks in advance for all your expert opinions.
I purchased a 1999 Porsche Boxster 986 about a year ago and I'm having a few problems with the electrical accessories. The top worked fine when I bought it, but now it won't work sometimes. The radio also turns on, then immediately off at startup, and it won' turn back on until a few minutes later either by itself, when I use turn signals, power windows, brake, or even just by itself. After the car is "warmed up", then it will stay on. Other things won't work right or not at all, such as the alarms for, ignition, door open, light switches, etc. The fuses are all fine, and I know the battery had been replaced right before I purchased it. I haven't checked the relay for the top, but I am about to do that now. I feel like there could be a single problem creating all these issues. Any help would be greatly helpful and appreciated!
Greetings and thank you for the informative site.
I am a new owner of a 2009 Cayenne base model with dead Horn. I’ve read on the forum of typical failures, including steering wheel wire and two horn units. So far I’ve confirmed the fuse is ok.
Before removing wheel arch covers to test the horns, I wanted to check the relay.
Is the horn relay in the under hood fuse box? If so, which position?