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Re: Surging
Posted by Philip Hult (more from Philip Hult) on Wed, 9 Feb 2000 11:34:42
In Reply to: Surging, Damon Rogers, Tue, 8 Feb 2000 20:22:04
>From the archives.... (Now archived at www.escribe.com)
This is an excerpt from a SAAB 9000 survey that Brett did for the group.
His comments below can be generalized to the 2.0 L engines of the era I
believe.
HTH
Philip Hult
'84 900 Turbo
'90 9000 CD Turbo
-- ATTACHED TEXT --
January 1997
Compiled and edited by Brett F. Martin, San Diego CA USA
-- EXCERPT --
2.0 L ENGINE: '85 through early '90
cold idle and stalling: 100% of the '85-early '88 owners report an unstable
idle. The infamous 'cold idle' problem occurs when starting a 'cold' engine
during temperate or hot weather: the engine RPM oscillates around the
proper idle speed (around 850 RPM) by reving up as hig! h as 1500 RPM;
coming down so low as to almost cause a stall; then reving up again.
Usually this extreme behavior disappears within 30 seconds. This behavior
is symptomatic of an air/fuel mixture that is actually leaner than the
sensors think it is. T! he cause of the problem could be as simple as a
pinhole leak in an air hose or as expensive as an aging sensor that is too
far out of calibration. Rarely is the engine computer itself at fault.
Unfortunately, it is very difficult to diagnose the exact ! cause, since
one's mechanic can make an 'attempt' only once per 12 hour (or so) period.
After the explicit 'cold idle' behavior disappears, it may be difficult to
drive the car without stalling. If it isn't too bad, the driver can
compensate by adjusting his usage of the accelerator and clutch; most owners
with a manual transmission don't ! fix the problem. However, the car may be
undriveable if it has an automatic transmission.
Note that during cold weather, the mixture is made rich enough that this
problem doesn't occur. The magnitude of the idle instability is also
sensitive to the octane of fuel used - the idle gets more erratic with
increasing octane. Also note that even ! when the engine is warmed up, the
idle is a bit unsteady. This issue has been discussed at great length in
The Saab Network and NINES magazine.
The next generation of Bosch fuel injection was incorporated starting in
late '88. From late'88 - '90, the 2.0L engines do not have this problem.
Posts in this Thread:
- Surging, Damon Rogers, Tue, 8 Feb 2000 20:22:04
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