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pdub Samba Member
Joined: July 07, 2006 Posts: 697 Location: San Diego
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Posted: Sat Apr 22, 2017 1:47 pm Post subject: idle circuit not responding |
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I took filters off 44 HPMX carbs and sprayed starter fluid in 1/2 side. Engine almost died. I did same on 3/4 side and it made no difference. This sides idle screws also make little to no difference when turned in/ out. The transition ports are not exposed and I cleaned idle jets. What would cause starter fluid make no difference? Thanks for your help/ideas! |
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67rustavenger Samba Member
Joined: February 24, 2015 Posts: 9754 Location: Oregon
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Posted: Sat Apr 22, 2017 4:17 pm Post subject: Re: idle circuit not responding |
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Start the engine and let it warm up.
One by one pull the spark plug wires from the 3/4 side of the dist. I bet you have one or two dead cylinders.
Make sure that the spark plug insulators are fully attached to the plugs.
I have had this problem in the past. They should "click" on the plugs something like 5-6 times when correctly connected.
Good Luck. _________________ I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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Multi69s Samba Member
Joined: January 24, 2006 Posts: 5363 Location: Lefty, CA
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pdub Samba Member
Joined: July 07, 2006 Posts: 697 Location: San Diego
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Posted: Sat Apr 22, 2017 9:02 pm Post subject: Re: idle circuit not responding |
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The main thing I noticed is it was idling rough so I cleaned out the idel jets and when tuning idle mixture screws I noticed they did not have much of an affect. I already checked plug wires, replaced plugs, did compression test. also took filter off and watched it idle to make sure fuel was not spilling down throat from somewhere else. and that throttle plates were closing all the way. All was good. I took carb of today to give it a good look through and cleaning. Oh, and fuel PSI is 3.5 and floats at 10mm and 30 mm. |
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66brm Samba Member
Joined: January 25, 2010 Posts: 3676 Location: Perth Western Australia
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Posted: Sun Apr 23, 2017 4:46 am Post subject: Re: idle circuit not responding |
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Checked sync lately? _________________ Aust. RHD 66 Type 1
Aust. RHD 57 Type 1 Oval
modok wrote: |
I am an expert at fitting things in holes, been doing it a long time |
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wcfvw69 Samba Purist
Joined: June 10, 2004 Posts: 13389 Location: Arizona
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Posted: Sun Apr 23, 2017 5:04 am Post subject: Re: idle circuit not responding |
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How about a big vacuum leak on the side not responding? _________________ Contact me at [email protected]
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Decades of VW and VW parts restoration experience.
The Samba member since 2004.
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Mikedrevguy Samba Member
Joined: October 15, 2008 Posts: 2237 Location: Medford, OR
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Posted: Sun Apr 23, 2017 7:53 am Post subject: Re: idle circuit not responding |
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What's the history on The carbs?
New? New to you? Did you disassemble and clean out before installing?
When you cleaned the jets, did you also blow through the carb?
After chasing plugged idle jets since I got my hpmx 44s (and when I put a set on my wife's 914) I fabbed a set of jet doctors for them both and have been virtually plug free.
Good luck
Rev. _________________ 74 1303 (RevBug): plan for German Look
76 914 with 2260
79 VW Iltis
69 Bwajaja
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Multi69s Samba Member
Joined: January 24, 2006 Posts: 5363 Location: Lefty, CA
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Posted: Sun Apr 23, 2017 1:09 pm Post subject: Re: idle circuit not responding |
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When you spray carb cleaner into the idle jets, does it pass right through? Make sure that you clean out the carbs idle circuits thoroughly. If it still does it, check for vacuum leaks. If no vacuum leaks, throw in some bigger idle jets on that carbs. There is a mythical mindset that says that all throats of the carbs MUST have all the same size jets. In some cases this is a total fallacy. Whether its from carb manufacturing issues, state of engine tune, or other factors, I have seen engines that required different jets in the different throats. _________________ 69 road Bug 2110
73 Squareback - 2L, T4, Automatic W/ AC
Gone, but many fond memories 69 Baja Bug 2010 - 5 Rib Bus Transaxle
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vwkirb Samba Member
Joined: January 16, 2007 Posts: 812 Location: Athens, GA
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Posted: Sun Apr 23, 2017 3:38 pm Post subject: Re: idle circuit not responding |
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Multi69s wrote: |
There is a mythical mindset that says that all throats of the carbs MUST have all the same size jets. |
That might be the case, but in general my understanding was tune to the leanest cylinder.
Chances are the op has a clogged idle circuit, or his idle air bleeds are blocked (sometimes the top gaskets do not have holes in them where they should).
If not that then his carbs could be way out of sync, and by that i mean his throttle plate is all the way opened on the offending side. OR a vacuum leak. |
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Multi69s Samba Member
Joined: January 24, 2006 Posts: 5363 Location: Lefty, CA
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rs58rag Samba Member
Joined: August 22, 2010 Posts: 419 Location: riverside,ca
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Posted: Sat Apr 29, 2017 7:27 pm Post subject: Re: idle circuit not responding |
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Make sure to replace idle jet o-rings and air/fuel mixture screw o-rings. Even if you have them in place they might be deformed, hardened, cracked and leaking. Tiniest leak will throw off settings. |
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sdavidg Samba Member
Joined: June 13, 2016 Posts: 28 Location: Sacramento, CA
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Posted: Mon Jun 26, 2017 11:24 pm Post subject: Re: idle circuit not responding |
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Looking for clues on a identical problem I'm having and was wondering if anything new has come up as to what the problem might have been.
I'll run through the suggestions mentioned in the previous posts too. |
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pdub Samba Member
Joined: July 07, 2006 Posts: 697 Location: San Diego
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Posted: Wed Jun 28, 2017 10:39 am Post subject: Re: idle circuit not responding |
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Much to my surprise it ended up being the carbs were just out of sync! Once I threw the snail on them and synced them up it became responsive again. |
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sdavidg Samba Member
Joined: June 13, 2016 Posts: 28 Location: Sacramento, CA
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Posted: Wed Jun 28, 2017 12:14 pm Post subject: Re: idle circuit not responding |
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Glad to hear, I'm leaving towards that too but can't seem to find my snail
- Sam |
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mark tucker Samba Member
Joined: April 08, 2009 Posts: 23937 Location: SHALIMAR ,FLORIDA
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Posted: Wed Jun 28, 2017 12:59 pm Post subject: Re: idle circuit not responding |
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that would be should be the first thing done.... then find out why. |
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