While there, cis K Jetronic refresh?

[ahh911]

Hi guys,
Plugging up any vacuum leaks, have new injectors ready for install, obviously new fuel filter but should I do anything else to the fuel injection system while there? I've seen some videos of people disassembling the fuel distributor unit and replacing all the O-rings, looks like hell. The car ran reasonably well before disassembly, though at times it would rev a solid 1000 rpm when warm, then ten minutes later a solid 600rpm. The auxiliary air regulator (cold start air pass) looks fully closed when warmed, (I passed the current through it and watched it close from a refrigerator temperature, so not that). Air leaks abound, at popoff valve, edge of airbox, as everyone else, and injector O-rings, but I don't think that would be a one or another type idle, but you never know. How about the distributor? The retard vacuum line was clogged at the throttle body. How much variation would distributors cause in rpm anyway? I don't think 400 rpm, but am unsure. Also checked the auxiliary air valve closes shut on vacuum, so maybe not that but need to check with a tool at what vacuum it actually shuts. And finally the deceleration valve had been blocked intentionally at the vacuum port, but behaved correctly and didn't allow air through the ports without vacuum, so not the problem. I've since removed the ball bearing placed in the vacuum line to revert back to orig. Any ideas on the two modes of hot idle? Both are steady when it occurs. Oh yeah, also thought about the idle switch? Noticed the bushing on the throttle link was totally shot (actually non existent), wonder if sometimes it thought it was off idle. One more perhaps important fact, the input side, or the above throttle plate side of the auxiliary air valve was not tightened I discovered. I was thinking that maybe the aux air valve might have fed some air past the throttle plate at times depending on whether the loose hose was letting air past or not. Theory being that full atmospheric pressure instead of partial vacuum as seen above the throttle plate coupled with air leaks below the throttle plate might at idle leave the auxiliary air valve with higher pressure on the "atmospheric" side then the vacuum available to close it? I don't know. Basically the two events occurring at the same time, low vacuum because of air leaks and the other port of the auxiliary air valve hooked almost directly to atmospheric pressure causing idle to drop or raise depending on the position of this untightened hose, the hose could slide back and forth, increasing and decreasing the flow of air. Maybe a stretch, anyone see this?

Thanks,
Phil

[ahh911]

Sorry, nomenclature on the earlier version of the post was confusing, I've corrected that so it makes more sense.

[targa72e]

Air leaks and ignition timing will all affect idle speed quite a bit. Sounds like you had many issues to address. Once those are all fixed see what you have.

john