tokoro

I change rotors and cap change spark plugs and ignition wire but the problem persist everytime i get a bump the engine cut power!! It is doing it less but it bothers!! How can i test the coils??Someone has this problem??
Help

sundog

DME relay? Or lose connection to computer under drivers seat?

crg53

Or bad ground on the battery.

Rocket Rob

Also check the ground strap between the starter and the bottom of the car.

tokoro

If the relay is bad i think theres would be a warning light on, no?

Frank 993 C4S

Crank positioning sensor:

Crank Positioning Sensor

dfinnegan

Write harness behind airbox?

tokoro

???

911Jetta

Sounds random I know, but have you recently replaced the chip?

I had the same problem months after I installed my 93 Octane chip. I didn't push it in hard enough and months later it would die after hitting a bump in the road...searched all around the car for problems before I found this simple fix.

Actually my shop found the problem...I was just about to remove my fuel pump! Glad I threw in the towel before doing that.

Merle

http://www.pcarworkshop.com/images/b...0590geolab.pdf

Here is a link to service bulletin for the afm wiring harness. You should check to see if yours has had it done. Might or might not be the problem but wouldnt hurt to check. Good luck!

Jacke2c

If I am not mistaken, there are grounds attached to the bolts behind you coils, and others around the engine bay. If I recall, i found liek 8-10 different ground points for different items all over the engine bay and under the frunk lid. All of mine had white residue corrosion (I live in a wet environment and suspect that my car had been swimming in an earlier life, but no direct evidence).

After I have cleaned al lthe connections, I have not had a problem since.

Best of luck. Jack