sounds like a vacuum leak, check hoses and intake manafold gaskets.
good luck
cliff
good luck
cliff
It Whistles when she runs
I have finally figured out what it sounds like when I put my foot in it, an old volkswagon with the 'twin' pipe old style exhaust. How on earth is the Alfa making an old Volks sound?
Any thoughts would be appreciated. I'd rather not have to replace the exhaust just to find out it's something else.
There is the chirping on pedal 'neutral' on decel, but not foot off decel, the plugs are white/tan/pink (pink?). Performance is not an issue, motor has 800 mi on rebuild.
Cheerfully,
Sam
Any thoughts would be appreciated. I'd rather not have to replace the exhaust just to find out it's something else.
There is the chirping on pedal 'neutral' on decel, but not foot off decel, the plugs are white/tan/pink (pink?). Performance is not an issue, motor has 800 mi on rebuild.
Cheerfully,
Sam
1 - 7 of 7 Posts
Thanks for the tip, I'll check. I'll need to check it at higher rpm I suppose as I've never found any leaks at idle.... and just motoring along she doesnt whistle anyway. Is there a way to check vacuum leaks by opening intake valve, covering intake throat and pressurizing the cylinder?
Sam
Sam
the most common way to check for vacuum leaks I've heard of is to spray the hoses and intake manafold with carb cleaner while the engine is running, any change in rpm or engine noise will spot leak.
cliff
cliff
Carb cleaner, WD maybe. I do have a 4 carb vacuum setup, I use it to balance the 3 cyl. honda outboard... might try that.
Cheers,
Sam
Cheers,
Sam
the ballancer might not show the problem if it is after the vacuum is manfolded together on the idle adjuster. the only places early 70's spiders used vacuum was the brake booster, fed from #4 cylinder, and the oil vapor seperator, fed from the idle air adjuster.
My sons 69 has a different way with the 4 lines going to two blocks mounted on the airbox.
cliff
My sons 69 has a different way with the 4 lines going to two blocks mounted on the airbox.
cliff
The balancer shows v. low vacuum on #1, perhaps unrelated to the whistle, but something to look into today. I did manage to readjust the TA, send the mixture completely south and generally de tune the poor soul. So, a start over moment with a compression check 1st and a slow slog back towards where I began.
Cheers,
Sam
Cheers,
Sam
1 - 7 of 7 Posts
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