idle on a 2056 with 9590 cam |
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idle on a 2056 with 9590 cam |
jmargush |
Dec 12 2013, 03:50 PM
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#1
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Member Group: Members Posts: 460 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
I am having trouble getting my new 2056 with a 9590 cam to idle. When I start it is idles around 500rpm or lower and I can't speed it up with the by pass screw.
I am running L-jet injection I hear a hissing sound when the engine is idling but I cannot find a vacuum leak, plenum couplers are new and all other hoses are in good shape. I can't find the hissing with a mechanics stethoscope so I was going to try to find a leak with propane but it has been too cold to work on it lately. The idle does seem to get a little better after it has warmed up a bit I think, it has been several weeks since I have had it out. One question I had is does the new cam require any change to the mixture? if so how do I go about adjusting the mixture? Thanks in advance for any input |
Jake Raby |
Jun 4 2014, 08:07 PM
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#2
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
It is now climbing to 1800 RPM because the additional air leaned out the idle. Lean engines idle high and won't settle when you toss them a rev.
An AFR meter is fairly worthless at idle, because the exhaust pulses are too slow and because of reversion in the exhaust system. Make the engine happy at idle, give it what it wants- it probably wants to be a lot fatter than it is now. |
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