|
|
|
|
| Author |
|
|
Registered
Join Date: Dec 2020
Posts: 2
|
1982 Porsche 911SC
hello
my 1982 911SC sputters, hesitates and is sluggish 2800-3200RPM when it is cold or hot.This happens in any gear when I am driving it. could it be my fuel pump or fuel injectors? thanks for your time. ed |
||
01-20-2021, 10:59 PM
|
|
|
Registered
|
Hi Ed it could be any number of things from distributor problems to fuel injection issues. You should probably seek the help of a Mechanic that knows these cars. You need knowledge of the CIS system how it operates and the tools you need to diagnose it.
|
||
|
01-21-2021, 09:06 AM
|
|
|
Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
|
Good advice, Ed. You are reporting misbehavior in a specified engine RPM range. The CIS system doesn't know, in a sense, what your RPMs are. It knows closed throttle, part throttle, and wide open throttle. It also knows (if this is a US car) what your air/fuel ratio is, and tries to optimize that. You don't say if the problem varies with how much throttle you give it, but I assume this happens no matter how hard you are trying to accelerate? But it likely isn't an injector or fuel pump issue, as those would not show up just in a fairly narrow range. This is more like the flat spots you sometimes find with carburetors. And from your description the engine starts and idles fine, and runs fine above 4,000 RPM.
Having a shop check out the CIS to see if it is in spec, and the distributor to see if the advance is working correctly would be a good idea. |
||
|
01-21-2021, 06:27 PM
|
|
