It's not that cold today (around 30F), but the temperatures were in the single digits the first time I noticed the high idle.
Jumped timing occurred to me, but that doesn't really explain the periodic knocking/tapping/popping noise, unless valve clearances are such that just one valve in one cylinder is touching a piston. -Joe On Tue, Feb 9, 2010 at 7:20 AM, Brian Shorey <[email protected]> wrote: > How cold is it? > > I'd hazard a guess that the timing belt jumped a tooth. > > bs > > ________________________________ > From: Joe Elliott <[email protected]> > To: AD <[email protected]> > Sent: Tue, February 9, 2010 7:17:01 AM > Subject: [alfa] GTV-6 engine problem > > Good morning Alfisti, > > Weather conditions here this morning precluded drving either of my > less-practical cars, so I essentially had no choice but to drive the > GTV-6, even when it exhibited an awful noise on startup. It was a > periodic (in the mathematical sense of the word) tapping noise > presumably once every other crankshaft rotation, like an exhaust leak > in one of the manifold branches, but it didn't sound *quite* like > that. More metallic, I'm afraid. And the engine was down on power, > waaaay down on power. More so than I would imagine if the problem > were limited to one cylinder as the noise would seem to suggest. And > at one point on the way to work (I think as I was cresting a hill and > closing the throttle) it backfired and died (plenum and intake boot > popped off). But the weirdest symptom was the high idle, especially > noticeable at startup, which seems inconsistent with the lack of > power. Of note is that I noticed a higher-than-normal idle on startup > the last two times I drove the car, which on both occasions came down > to normal within a minute of operation, so I wrote it off to a sticky > throttle in the extreme cold or something and didn't worry about it. > > Any ideas? I should probably just park the car until the weather is > more conducive to outdoor tinkering, but I'm probably going to be too > preoccupied worrying about it to get anything done at work today, so I > may go home early and do some troubleshooting. Any suggestions would > be appreciated, as the symptoms seem totally inconsistent to me. > > Thanks, > Joe Elliott > '82 GTV-6 > -- > to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi > or email "unsubscribe alfa" to [email protected] -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
