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1979-1993 & 94 Conv [Subscribe to Daily Digest] |
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Ari, (and anyone who can help):
Hi. This is an update. I posted a few days ago about AMM on my Mom's 1990 900 base (LH 2.4, 16V, of course) and got a lot of good responses. It has the morning "mood-swing" hunting idle (from stall to 2000 RPM oscillation), that is, until 60 seconds or maybe 2 minutes after start-up. tThen, all gradually has become well, meaning the idle speed gradually smooths out to 900 rpm or thereabout.
I suspected the Air Mass Meter, after reading many posts here. The AMM glowed, however, during the (4-sec. after shut-off) burn-off tests! That's why I asked, in my previous post that day, if glowing AMM could still be "bad," yet wire intact. Ari said YES, it could be bad and gave me some voltages to check at pins 3&5 of AMM wiring connector, AMM still connected w/engine running, probing back of connector plug.
At idle, at pins 3(+) & 5(-) with my digital voltmeter, I got (negative) -11.85 volts, meaning that pin 5 was positive, not negative, and vice versa. Ari said around 2 volts at idle was numbers for a good AMM!
When revving the engine, I got it to dip to 11.20 volts or so (11.05, once). , which is NOWHERE near what Ari said should it be. He said 3 volts (approx.) when engine revved! What's the deal here? I am completely sure I checked the correct pins and plug WAS plugged into the AMM! Any ideas?
Thanks in advance for helping me understand LH,
Micah in NC
'84 900S, 220K mi. (my good ol' CIS 8V)
'90 900, 67K mi. (the quirkier SAAB)
posted by 216.77.232...
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