 Decel Valve - Delete Option, Should it Stay or Should it Go? |
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| Larouex |
 Apr 27 2009, 10:51 PM
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#1
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Larouex  Group: Members Posts: 144 Joined: 22-July 08 From: Larouex@gmail.com Member No.: 9,339 Region Association: Pacific Northwest  |
I have finally put my 1974 2.0 back together and i have it running with the original fuel injection. I have solid compression on all cylinders and had it out on the freeway on Sunday up 90MPH.
I am now fighting to fix a couple little things. The engine after I take it out of gear and let it go to idle, will dip to a really low rpm and then recover. I think this is related to the decel valve and many say that it should just be removed altogether. AA wants 198.00 for this part and wow that is a lot for this little part. What says the folks here and please feel free to point me to any previous debates, I searched but did not find a specific thread. Cheers, Larouex |
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| SLITS |
Apr 28 2009, 06:08 AM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
It is an emissions device and the engine can run without it.
It's function is to add extra air on closed throttle deacceleration to "prevent" backfiring. Removal may cause backfiring. Make sure it is hooked up correctly by doing a search here or checking the dialogue on PBanders D-Jet site (Google is your friend ... type in PBanders) |
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| Bleyseng |
Apr 28 2009, 06:28 AM
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#3
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
your problem isn't related to the Decel valve as SLITS has stated it would actually hold a higher idle on decel due to the increase of air being added to the idle mix. I think your idle mix is too rich so check the knob on top of the ECU to check where its at. Look on Brad's site to adjust your idle mix properly as usually people crank the knob up way to much. (IMG:style_emoticons/default/chair.gif)
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| type47 |
Apr 28 2009, 06:50 AM
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#4
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
I have read suggestions that the MPS diaphragm gets more "wear" if running w/o the decel valve. Unconfirmed recollection, if the factory put it in, maybe the default mode should be to include it. Get a used one for much less than new.
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