1979-1993 & 94 Conv [Subscribe to Daily Digest] |
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, Mon, 2 Jan 2012 15:02:06
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...900 Turbos.
When a new one of these cars comes into my sphere, if it doesn't run/drive as I expect, I take a Big Bang approach and do a good solid tune-up.
I always pull the spark plugs and make sure they're the right NGKs. If not, I get a new set, properly gap them, and install them. I inspect the ignition wires--if they're Bougis, I test them and if they're good, I re-install them. If not, I get a new set of Bougis for the car. I always check the ignition timing, and re-set it if it's out.
After I know the ignition system is solid, I clean the idle control valve, clean the throttle body (paying some special attention to the bleed valve), and then go about setting the basic idle including the TPS. Setting the basic idle involves grounding the 1-pin test plug so that the IAC fully closes, then setting the idle to 750-800rpm using either the bleed screw if so equipped, or the throttle stop and adjusting the TPS to suit which is tedious but it is what it is. I use the digital tach on my timing light to help me with this. I've never met a dash pot that still works after 20+ years, and haven't bothered replacing one...
Once I know the basic idle is set, then I attack the AMM/O2 sensor. First, I pull the AMM and set it to 380ohms (pin 3 and 6 as I recall), then I re-install it in the car, throw an analog multimeter on the other test plug, and dial in the AMM until the signal is swinging properly between the two ends of the scale, spending roughly equal amounts of time at each end over a minute or so of fully-warmed-up idle. If I can't get the AMM adjusted properly, I replace the O2 sensor.
Doing some combination of this kind of stuff has worked for me on every LH2.2 900 turbo I've encountered... and I've done this to at least 6 or 7 that I can think of in the last few years... I still know most of these cars and they drive pretty much as nicely as the later LH2.4 cars, and effortlessly breeze through emissions testing. Of course, they all do the idle wander thing that the LH2.2 cars do as the O2 sensor swings once they're warmed up.
I've only had to declare one AMM dead--it wouldn't even start the car...
Best of luck!
--jeff
'85 SPG
'89 SPG
posted by 24.84.216...
, Mon, 2 Jan 2012 15:02:06, Wed, 4 Jan 2012 11:29:25
, Wed, 4 Jan 2012 14:26:03, Wed, 4 Jan 2012 16:43:29, Tue, 3 Jan 2012 09:43:40, Mon, 2 Jan 2012 19:57:52, Mon, 2 Jan 2012 17:34:19, Mon, 2 Jan 2012 15:35:10
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