1985 911 3.2 Rough cold start
#1
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Hi folks -
I recently purchased a 1985 911 Targa and it suffers from a rough cold start issue. I posted a video to youtube to show what happens... on cold start it will flutter between high and low revs. The video I took isn't the worst it will be... sometimes it flutters bad enough to stall the engine. After warming up the car will idle at a consistent, reasonable rev level.
I do believe that the vehicle has a Steve Wong chip installed, but haven't been able to verify that yet.
Any ideas what might be causing this issue? I was considering taking it to a local tuning shop to see if they could diagnose/fix the problem.
Thanks in advance for any help!
I recently purchased a 1985 911 Targa and it suffers from a rough cold start issue. I posted a video to youtube to show what happens... on cold start it will flutter between high and low revs. The video I took isn't the worst it will be... sometimes it flutters bad enough to stall the engine. After warming up the car will idle at a consistent, reasonable rev level.
I do believe that the vehicle has a Steve Wong chip installed, but haven't been able to verify that yet.
Any ideas what might be causing this issue? I was considering taking it to a local tuning shop to see if they could diagnose/fix the problem.
Thanks in advance for any help!
#2
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maybe lean when first started, I would try a smoke test first to make sure that the intake is tightly sealed. There are many other things but but lean when cold would cause it
The following 2 users liked this post by Dr. 914:
arugulamonster (06-20-2024),
silverlock (06-19-2024)
#3
#4
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hunting is caused by rich condition. I know many disconnect the o2 sensor altogether.. have you tried a new O2 sensor ? i would ask on Pelican.
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arugulamonster (06-20-2024)
#5
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Hi folks -
I recently purchased a 1985 911 Targa and it suffers from a rough cold start issue. I posted a video to youtube to show what happens... on cold start it will flutter between high and low revs. The video I took isn't the worst it will be... sometimes it flutters bad enough to stall the engine. After warming up the car will idle at a consistent, reasonable rev level.
https://www.youtube.com/shorts/9JYOxIVFmHU
I do believe that the vehicle has a Steve Wong chip installed, but haven't been able to verify that yet.
Any ideas what might be causing this issue? I was considering taking it to a local tuning shop to see if they could diagnose/fix the problem.
Thanks in advance for any help!
I recently purchased a 1985 911 Targa and it suffers from a rough cold start issue. I posted a video to youtube to show what happens... on cold start it will flutter between high and low revs. The video I took isn't the worst it will be... sometimes it flutters bad enough to stall the engine. After warming up the car will idle at a consistent, reasonable rev level.
https://www.youtube.com/shorts/9JYOxIVFmHU
I do believe that the vehicle has a Steve Wong chip installed, but haven't been able to verify that yet.
Any ideas what might be causing this issue? I was considering taking it to a local tuning shop to see if they could diagnose/fix the problem.
Thanks in advance for any help!
Once I've provided a stock chip, the problem was resolved.
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Loren
Systems Consulting - Automotive Electronics
Specializing in Porsche cars
http://www.systemsc.com/
Loren
Systems Consulting - Automotive Electronics
Specializing in Porsche cars
http://www.systemsc.com/
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Last edited by systemsc; 06-19-2024 at 11:13 PM.
The following users liked this post:
arugulamonster (06-20-2024)