 Please move this to Garage: No need for decel valve |
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| nditiz1 |
 Sep 27 2018, 05:15 PM
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#1
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Senior Member  Group: Members Posts: 1,180 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region 
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Was looking for a decel valve to alleviate popping in deceleration of FI system. Rand says this is caused by a Lean condition and the decel valve will not fix it.
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| Rand |
Sep 27 2018, 05:23 PM
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#2
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Why?
I might have one that was removed intentionally. But unless you want it for concourse reasons... WHY? |
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| nditiz1 |
Sep 27 2018, 05:40 PM
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#3
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Senior Member Group: Members Posts: 1,180 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region
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QUOTE(Rand @ Sep 27 2018, 04:23 PM)  Why? I might have one that was removed intentionally. But unless you want it for concourse reasons... WHY? I'm getting popping on decel. |
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| Rand |
Sep 27 2018, 05:46 PM
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#4
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
That's a lean condition. You don't need a decel valve to fix that right. Decel valve is a piece of garbage that didn't do anything except pacify some government bull about emissions control.
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| Rand |
Sep 27 2018, 08:08 PM
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#5
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
WTF with the delete?? Please share the answer to help all of us.
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| nditiz1 |
Sep 28 2018, 05:50 AM
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#6
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Senior Member Group: Members Posts: 1,180 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region
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QUOTE(Rand @ Sep 27 2018, 07:08 PM) WTF with the delete?? Please share the answer to help all of us. There I fixed it. I deleted it since this was not the correct forum. It started as a WTB and then turned into a tech Q&A. I PM'd you asking for the solution. Can you provide here how to alleviate the popping? |
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| mgphoto |
Sep 29 2018, 02:37 PM
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#7
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"If there is a mistake it will find me" Group: Members Posts: 1,338 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
Most probably the MPS need tuning, some more info about the engine will help.
Lean on over run is not so much a bad thing, especially in race cars. |
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| ClayPerrine |
Oct 12 2018, 03:34 PM
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#8
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Life's been good to me so far..... Group: Admin Posts: 15,436 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(Rand @ Sep 27 2018, 06:46 PM) That's a lean condition. You don't need a decel valve to fix that right. Decel valve is a piece of garbage that didn't do anything except pacify some government bull about emissions control. Actually, you are incorrect. The decel valve is there to soften the throttle closing when you jump out of the throttle at high RPM. Without the decel valve, the fuel injection will drop the idle speed below the point where the engine idles. Taht will cause the car to die. The decel valve just bypasses the throttle plate when the engine is at a high vacuum. It will do nothing to lean out the mixture. |
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