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MikeBehrens Samba Member
Joined: May 08, 2011 Posts: 8 Location: everett, wa
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Posted: Sat Mar 26, 2016 12:58 pm Post subject: Half throttle hesitation |
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So I'm having this issue, car idles smooth, the timing is set correctly, valves adjusted correctly, when I'm driving and have the throttle about halfway down the car falls on its face and sputters but if I go full throttle it accelerates great.
Engine 2332cc
Dual Webber 44idf
Bosch 009 electronic ignition set to 30 deg btdc at 3000rpm |
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67rustavenger Samba Member
Joined: February 24, 2015 Posts: 9767 Location: Oregon
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Posted: Sat Mar 26, 2016 1:09 pm Post subject: Re: Half throttle hesitation |
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Welcome to the samba. I know you stated that your timing is correct. Go back and check it again. I had a flat spot at throttle opening. It turned out to be timing. I was surprised that 2 degrees made a huge difference. Also look for vacuum leaks.
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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Brian Samba Moderator
Joined: May 28, 2012 Posts: 8340 Location: Oceanside
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Posted: Sat Mar 26, 2016 1:20 pm Post subject: Re: Half throttle hesitation |
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Advance curve on your 009 is more than enough the issue. _________________ Wash your hands
'69 Bug
'68 Baja Truck
'71 Bug
'68 Camper
Only losers litter |
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the2ndcashboy Samba Member
Joined: March 19, 2007 Posts: 827 Location: Houston
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Posted: Sat Mar 26, 2016 3:26 pm Post subject: Re: Half throttle hesitation |
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So did this motor previously run fine and this problem is something new? Or did you just start driving it? What's the jetting on your 44's? Ever had a wideband on it? _________________
SRP1 wrote: |
You see....... He talks in code and translation requires a priest, geologist, astronomer, biophysicist, and Indiana Jones. |
modok wrote: |
If anything comes out perfect it just means your measuring tools are substandard. |
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MikeBehrens Samba Member
Joined: May 08, 2011 Posts: 8 Location: everett, wa
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Posted: Sat Mar 26, 2016 4:58 pm Post subject: Re: Half throttle hesitation |
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Motor previously ran fine, this issue just started. Idle jet is .50 main is 1.35 |
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modok Samba Member
Joined: October 30, 2009 Posts: 26788 Location: Colorado Springs
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Posted: Sat Mar 26, 2016 5:24 pm Post subject: Re: Half throttle hesitation |
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Stale gas? |
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bsairhead Samba Member
Joined: October 08, 2008 Posts: 3579 Location: viroqua wi.
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Posted: Sat Mar 26, 2016 5:26 pm Post subject: Re: Half throttle hesitation |
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Stale distributor? |
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MikeBehrens Samba Member
Joined: May 08, 2011 Posts: 8 Location: everett, wa
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Posted: Sat Mar 26, 2016 6:28 pm Post subject: Re: Half throttle hesitation |
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Fresh gas, I played with the timing to no avail.. Back at 30 deg. Just drove it on the freeway and it sputtered and popped the whole time, felt like it was running on 2 cylinders. Once I got off the freeway it went back to just having a huge hesitation at about half throttle then catching itself and accelerating smooth again at full throttle. |
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the2ndcashboy Samba Member
Joined: March 19, 2007 Posts: 827 Location: Houston
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Posted: Sat Mar 26, 2016 6:45 pm Post subject: Re: Half throttle hesitation |
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2332? Fairly big cam and rough idle? Can you tell if it's missing at idle? I'm thinking plugged idle jet. You'd be partially on the idles at cruise, and then as you floor it you go over onto the mains and they take over and it runs fine. _________________
SRP1 wrote: |
You see....... He talks in code and translation requires a priest, geologist, astronomer, biophysicist, and Indiana Jones. |
modok wrote: |
If anything comes out perfect it just means your measuring tools are substandard. |
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vwracerdave Samba Member
Joined: November 11, 2004 Posts: 15308 Location: Deep in the 405
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Posted: Sat Mar 26, 2016 6:52 pm Post subject: Re: Half throttle hesitation |
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Check your dual carb linkage very carefully and make sure both carbs are operating at the same rate. Have you sync'd both carbs with a snail guage? _________________ 2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK |
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cecil Samba Member
Joined: February 23, 2005 Posts: 461 Location: Stockton, CA
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Posted: Sat Mar 26, 2016 7:13 pm Post subject: Re: Half throttle hesitation |
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I'm thinking to lean. When I saw the jetting, I thought IDF 40. _________________ I may not be that funny or athletic or good looking or smart or talented....I forgot where I was going with this
I have this wierd desease called "must tear everything up and put it back together when there's nothing wrong with it...Itus." |
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MikeBehrens Samba Member
Joined: May 08, 2011 Posts: 8 Location: everett, wa
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Posted: Sat Mar 26, 2016 7:19 pm Post subject: Re: Half throttle hesitation |
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Checked linkage and it's good, I figured it's running a bit lean too but it was running great the other day so it may have just gotten plugged up. It has a pretty mild can and idles smooth, and yes I've synced the carbs. I'm going to pull the carbs off and clean them out, check the floats etc. |
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66brm Samba Member
Joined: January 25, 2010 Posts: 3676 Location: Perth Western Australia
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Posted: Sun Mar 27, 2016 10:23 pm Post subject: Re: Half throttle hesitation |
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Agree with the above it sounds lean, bump up to a 52-55 idle jet _________________ 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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mark tucker Samba Member
Joined: April 08, 2009 Posts: 23937 Location: SHALIMAR ,FLORIDA
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Posted: Mon Mar 28, 2016 9:32 am Post subject: Re: Half throttle hesitation |
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clean the idle jets, jet up the mains to 145 idles probably 55 airs 200. and run a can of berrymans fuel system cleaner through it($3.17 at wallyworld). the dist probably also needs recurved. plugs may need changed too, check heatrange reading.it may also be carb acc pump adjustment.or dead pump |
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the2ndcashboy Samba Member
Joined: March 19, 2007 Posts: 827 Location: Houston
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Posted: Mon Mar 28, 2016 11:25 am Post subject: Re: Half throttle hesitation |
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MikeBehrens wrote: |
Combo was running fine until this issue popped up |
TheSamba wrote: |
Start throwing jets at it |
_________________
SRP1 wrote: |
You see....... He talks in code and translation requires a priest, geologist, astronomer, biophysicist, and Indiana Jones. |
modok wrote: |
If anything comes out perfect it just means your measuring tools are substandard. |
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madmike Samba Member
Joined: July 11, 2005 Posts: 5292 Location: Atlanta,Michigan
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Posted: Tue Mar 29, 2016 6:15 am Post subject: Re: Half throttle hesitation |
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If that don't fix it try a different dizzy _________________ 'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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MikeBehrens Samba Member
Joined: May 08, 2011 Posts: 8 Location: everett, wa
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Posted: Tue Mar 29, 2016 6:05 pm Post subject: Re: Half throttle hesitation |
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Went up to 55 idle jets, Put a vacuum advance dizzy in and cleaned the carbs out. The issue seems to be gone. Thanks for the help guys. |
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