Stalling when stopping
Thread Starter
Advanced
Joined: Jun 2014
Posts: 84
Likes: 6
From: Tampa, FL USA
Stalling when stopping
Hope ya'll can offer some advice. My '91 964 3.6l baby is starting to stall when coming to a stop. I then have to wait at least 30 seconds before restarting. Seems to get worse as the engine warms up.
I'm thinking it may have something to do with a temperature sensor that helps control air intake. Any thoughts are greatly appreciated.
I'm thinking it may have something to do with a temperature sensor that helps control air intake. Any thoughts are greatly appreciated.
Last edited by pyramidimaging; Dec 22, 2023 at 02:13 PM.
Three Wheelin'
Joined: May 2009
Posts: 1,280
Likes: 135
From: Bucks, Herts, Beds Tri-Border, UK
Worse when the engine really hot (i.e. if yes, do you know that both the oil cooler fan low and high speeds operate)?
Cold running ok? DME fuel relay swapped over yet? Rough idling (ISV)?
Cold running ok? DME fuel relay swapped over yet? Rough idling (ISV)?
Trending Topics
Thread Starter
Advanced
Joined: Jun 2014
Posts: 84
Likes: 6
From: Tampa, FL USA
Excuse my ignorance but what is an ISV and where can I find it on the car? I found a thread in the 928 forum about spraying WD40 into it but nothing to help me locate this ISV in my 964.
I'm hopeful this is the problem as the fellow in the 928 forum was stating the exact same symptoms that I'm experiencing.
I'm hopeful this is the problem as the fellow in the 928 forum was stating the exact same symptoms that I'm experiencing.
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
Porsche's Top 5 Most Questionable Naming Decisions
Verdad Gallardo
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field
Verdad Gallardo
6 Convertible Top MYTHS Most People Don't Understand!
Michael S. Palmer
2026 Porsche 911 Club Coupe is Spectacular, And Everything Wrong with the Porsche Market
Joe Kucinski
Talos Takes Your 991 Porsche 911 GT3 to the Next Level for a Cool $1.13 Million
Verdad Gallardo
9 Vehicles Porsche Helped Engineer that Aren't Porsches
Verdad Gallardo
9 Features and Characteristics That Only Porsche People Understand
Verdad Gallardo
I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way
Joe Kucinski
10 Most Unnecessary Porsches Ever Built (And Why We Love Them)
Verdad Gallardo
Thread Starter
Advanced
Joined: Jun 2014
Posts: 84
Likes: 6
From: Tampa, FL USA
Thanks for these suggestions. I'll research this more after I find out where the ISV is located and clean it, since that sounds quick and easy.
Rennlist Member
Joined: Dec 2007
Posts: 988
Likes: 187
From: Chicago, IL
Originally Posted by pyramidimaging
Excuse my ignorance but what is an ISV and where can I find it on the car? I found a thread in the 928 forum about spraying WD40 into it but nothing to help me locate this ISV in my 964.
I'm hopeful this is the problem as the fellow in the 928 forum was stating the exact same symptoms that I'm experiencing.
I'm hopeful this is the problem as the fellow in the 928 forum was stating the exact same symptoms that I'm experiencing.
Search for a picture of the engine bay on this forum and download the service manual. That will help you.
Thread Starter
Advanced
Joined: Jun 2014
Posts: 84
Likes: 6
From: Tampa, FL USA
Also, the two hoses are attached with crimp on clamps. I'm going to try and pry them off with a screwdrivef and reclamp them but will probably have to cut them off. Then I'll have to figure out the diameter for a replacement clamp.
So, it was easy for me to find ISV but not so easy for me to remove it. I'm just a novice though.
Rennlist Member
Joined: Jun 2015
Posts: 610
Likes: 163
From: Charlotte, NC
100% Fuel pressure regulator. I went through this exact same thing. Not anything easy to look at to determine if it’s working correctly. I replaced mine and it was exactly why after my car stalled and wouldn’t start again. The FPR is supposed to pull the fuel back when the car stops running and instead fuel was being dumped into the engine. It was like the car was flooded and it wouldn’t start. 30 seconds or so later it would start. Pretty annoying at a stop sign with cars behind me!
