1994-2002 [Subscribe to Daily Digest] |
Members do not see ads below this line. - Help Keep This Site Online - Signup
My DI is fine. I also had a leaking exhaust flex joint replaced while in the shop. (The dyno guy noticed that there was some exhaust puffing around that area at the free dyno day.)
They found some interesting things. The folks at George's Imports are great at diagnostic work. They really impressed my with some work a few years ago as well.
The replacement gas cap that Saab Canada provided 4 years ago was the wrong kind and needed to be replaced with one that vents to atmosphere. The cap that I had was sealing the tank and creating pressure problems. That was probably not a root cause of todays problems, but they picked it up.
The hose that goes to the manifold absolute pressure sensor was split where the Tee was inserted by me last summer for my boost guage. It was not a major leak as far as idle or combustion flow, but it was causing the ECU to see inacurate pressures and that led to improper fuel mapping.
The O2 sensor did have some problems. The O2 sensors develop a signal relative to ground, and the sensor's ground is developed through the exhaust system! The backed out the sensor and cleaned things up a bit and tightened it down again and achieved a workable ground. It was installed by me last summer, with anti sieze and I did not tighen it down extremely hard, as these things have to come out in the future. So how many shops would have put in a, very expensive, new O2 sensor, and guess what, the ground is re-established with the install of the new, and the old but good sensor goes into the trash? Now this is kind of service earns my respect!!!
Maybe the O2 sensors deserve dedicated grounds... the exhaust system hangs on rubber bits and the ground has to go through the turbo via the roasted 3 bolt clamp at the turbo.
Then the idle was high and would not settle down after all of these things were set right. They were convinced that they had found and corrected the root problems. So the assumption was made that the ECU had gone into limp home mode was was running trusty but ugly parameters to just keep running. So they removed power from the ECU, via the battery I suspect (radio stations all wiped out from memory), and the ECU came back up fully operational. So this is an interesting thing for those with cronic high idle speeds. Might be worth a try.
The DI tested fine. I might even put my two year old spark plugs back in, they only have 50,000 miles on them :)
thanks to the team at George's Imports
95SET, 200,000 km
, Fri, 4 May 2001 08:25:38
, Thu, 3 May 2001 22:08:18, Fri, 4 May 2001 11:47:00
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
