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1979-1993 & 94 Conv [Subscribe to Daily Digest] |
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Ugha. At my wit's end. Normally my '90 SPG runs a bit rough on cold start and then runs fine when warm. About a week and a half ago I started her up and she was running really really rough. After letting her warm up a bit, no improvement. Would barely get up my driveway in first -- got me to work. At idle, my boost/vac guage flutters wildly. Wideband o2 says she's running rich.
Skip forward to today (just got back from a trip) and I've been trying to trouble shoot. I pulled all of the plugs to run a compression test (came out -/+ 5 psi of eachother) and noticed that #2 plug was BLACK -- only the tiniest tip of the electrode on the plus wasn't. I shined a flashlight into the cylinder through the hole and everything I could see was blackened.
I got her running again with a different set of plugs, unplugged #2's wire and there was no difference in running. I held the wire up to the block and there was plenty of spark. I checked the cap and tried a different rotor (didn't have a spare cap) with no change. Tried a different wire on #2 -- no change.
Disconnected the water injection (aquamist) just in case. No change. Tried a different AMM (why not?). No change.
So, now I suspect fuel -- only if there was no fuel the top of the piston and the old plug wouldn't be coated in carbon. So, I guess that the #2 cylinder is running WAY too rich? How's this possible.
As an aside, out of interest I tried pulling wire #3 and #2 at the same time. To be honest, I couldn't really tell if there was any difference at all with this either.
I double-checked the firing order. I swapped 2 & 3's positions on the cap and there was no change.
At this point I really don't know what else to try. I suppose it could be the injector? Can an injector get stuck open?
Any advice would be appreciated.
Thanks,
-Dan
(fyi, she's running 30# injectors w/ resistor inline on the AMM)
posted by 12.5.4...
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