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 |
Dec 12 2013, 06:18 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 |
What are the rest of the engine specs?
You may find drilling a 1/8" hole in the throttle plate will help. There are times when the engine moves more air at idle than the stock idle bypass screw will allow for. |
jmargush |
May 31 2014, 09:48 AM
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#3
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Member Group: Members Posts: 460 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
What are the rest of the engine specs? You may find drilling a 1/8" hole in the throttle plate will help. There are times when the engine moves more air at idle than the stock idle bypass screw will allow for. Jake hopefully you'll see this and and offer some advice. I have a AF ratio meter with wide band O2 sensor hooked up now. I still didn't drill the hole in the throttle plate but i am wondering if the symptoms are pointing that way. here's where I am at: L-jet 2056 9590 cam No vacuum leaks that I can find, plenum removed and pressurized to check for leaks All other hoses are new Idle is somewhere between 300 and 500 rpm with AF reading 26-28 If I crack the throttle and bring the rpms up to 900 I get numbers closer to 16-17 (this was just a first glance) which lead me back to the 1/8" hole in the throttle plate. Does this point to needing that hole so I can even get the idle up to where the AF is giving relevant logical readings? |
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