notfarnow

My 964 started to hiccup and hesitate, and it took me a while to pinpoint what was going on. It seems that when I go over a bump, especially on the driver's side, the car will hesitate. It almost seems like it will stall, but if I put the clutch in it idles fine... just hesitates badly when I'm on the gas. It goes away after a few seconds, or if I hit a bump again.

I've almost gotten used to driving around looking for a second pothole or bump so I can shake the sillies out of it. I figure it must be a relay of some sort. Any likely suspects?

LM964

Bizzare... have you opened up the relay/fuse box in the trunk and checked that all relays and fuses are seated firmly in place?

Have you tried swapping the DME relay (R41) with a new one (essential carry-on spare)? The advice is also to check you have the 993 improved relay (the original being a 944 unit) - part #993 615 227 00.

Rocket Rob

Cutting out because of a bump sounds like an electrical fault. In addition to checking (replacing) the DME relay, I would check your grounds. There are a number of them but the two primary ones are at the bttery and the other is between the starter and the bottom of the car.

kos11-12

+ 1 to the above comments,
Check resistance to the coils 8 ohms
And more difficult , the resistance to the HT leads 15 ohms , !!per meter !!

gchristofi

All good advice above. The things I would check are
-DME relay swap
-Connections to DME under the LH seat
-AFM connector not suffering grounding issues on pipes in engine bay (technical bulletin for this if you search)
-Ground straps and battery connections
-Hall connector on the distributor is not loose

Good luck