Overdraft

Car runs beautifully…perfect…but when I come to an intersection and brake..rev drops..stalls…start up and go, all good….next intersection stalls. Does this about four times then after about 10 minutes, simply stops stalling - all good again.

Clearly a little unnerving…particularly if my wife is driving. Any ideas/ theories? It running beautifully today.

Anything to start chasing down?

boomboomthump

Have you checked/cleaned the ISV (idle speed valve)? https://rennlist.com/forums/993-forum/1284047-isv.html

Nurburger

ISV was the first thing I thought of also.

Can be a PITA to remove but there are good DIY's & tips. it's been 12 years or so but I think I remember spraying the rubber sleeve/grommet that holds the ISV with PB Blaster and letting it soak in overnight to help.

pp000830

Hi Overdraft,
The page below discusses root causes of idle and poor running issues:
https://993servicerepair.blogspot.co...r-robbing.html
Andy

Overdraft

Thanks guys. I will start hunting these down this weekend.

boomboomthump

I'll "eat my hat" if it's not the ISV. When you yank it out I'm sure you'll find it's all gummed up with oil residue. Get a can or two of carb or brake cleaner, remove the ISV and start spraying.

When you shake/rotate the ISV like a you should hear the valve moving around freely, like this:

Overdraft

brilliant..thanks!

Overdraft

exactly as predicted. Removed ISV….it’s dirty and gummed up…can of brake cleaner spray…shake ISV nothing… spray more fluid…hear sort of a rattle…more fluid..then rattles,..more cleaner..rattles freely now and looks nice and clean. Reinstall in the car, runs beautifully..no stalling. Thanks all!

boomboomthump

Nice! Thanks for reporting back.

Now the wife can enjoy many more panic free drives.

Goose 993

Rennlist success stories ftw!