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Re: HArd starting?
Posted by David Prantl (more from David Prantl) on Sat, 9 Dec 2000 09:32:00
In Reply to: HArd starting?, Larry Green, Wed, 6 Dec 2000 16:34:15
Larry,
The '93 9k turbo was the first model sold by SAAB in the US with the Trionic
engine management system. It is vastly more sophisticated than the earlier
Bosch Jetronic systems. This means that it is designed to start and run
flawlessly from -50 (or lower) to 120 (and higher) degF, from below
sea-level to the highest elevation where a paved road exists, from zero to
100% humidity, and everywhere in-between. Any noticeable stumbling
indicates that there is some kind of problem.
You didn't specify whether your CSE has traction control or not. The
traction and non-traction versions differ in terms of the specifics of the
Trionic engine management system.
However, as a general rule for both versions, I would check all the
attachment points of the vacuum lines in the engine compartment. Pay close
attention to the short line from the manifold to the fuel-pressure
regulator, and the 'special' line to the MAP (pressure sensor clipped to the
bulkhead panel. Check the one-way vacuum valve on the line to the valve
cover (PCV), which should allow air flow only one way (from the valve cover
towards the manifold). Check the turbo-bypass valve (hooter valve) by
applying vacuum to it where the small hose attaches - it should hold vacuum.
If all that is OK and the problem persists, I would change the air filter
(checking the ducting and air piping carefully), spark plugs (NGK BCPR7ES
gapped to 0.039'), fuel filter, and burn a bottle of techron (or similar)
concentrated fuel system cleaner with a half-tank of premium gas in the
motor.
The problem could also be a DI casette (ignition coil module) that's on it's
way out, but I haven't had that happen to me personally (yet).
If you have a non-TCS car, it may help to remove, clean, and replace the
idle control valve. Problem is that the valve is jammed-in underneath the
intake manifold - very difficult to get to unfortunately.
If you have TCS, it would be extremely helpful to visit a service
establishment that owns and knows how to operate a SAAB scan tool (ISAT or
TechII). There are more than 100 possible distinct fault codes that can be
stored by the ETS and Trionic control units alone, and ETS has a calibration
procedure which requires scan tool use. There's also a
recall/service-bulletin that deals with an improperly calibrated vacuum port
on the early ETS throttle bodies, which could cause driveability problems.
Basically, a TCS car is IMPOSSIBLE to diagnose and maintain effectively
without a scan-tool.
Best of luck.
David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP
'86 9000T, 5M, 182kMi
'88 9000S, 5M, 142kMi
'90 9000S, 4A, 133kMi
'93 9000CSET, 5M, 64kMi
'89 900, 3A, 115kMi
'68 97 Sonett V4, 76kMi, #000467
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Posts in this Thread:
- HArd starting?, Larry Green, Wed, 6 Dec 2000 16:34:15
- Re: HArd starting?, David Prantl, Sat, 9 Dec 2000 09:32:00
- Prev by Date: 2001 9-3 Viggen Performance, Ari Kahan, Sat, 9 Dec 2000 09:31:58
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