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1975 Kombi
Samba Member
Joined: August 12, 2007
Posts: 2452
Location: Acton, Ontario, Canada
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 Posted: Sat Dec 12, 2015 8:02 pm Post subject: Re: Another dwell question |
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Break out the spray bottle. lol
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Brett
“He’s decieving you boy! Reach into his pocket and take what he’s got.” Mr. Crabbs.
75 Westy auto
03 Jetta TDI
71 SB
74 Westy
Licensed pilot (single engine land VFR)
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Rust In Pieces: 72 Bug, 73 Bug, 81 Rabbit LS D 2D, 83 Rabbit D 2D, 84 Jetta TD GL, 85 Jetta D, 68 Z28 RS 302, 91 Passat 16v |
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Tue Dec 15, 2015 1:24 pm Post subject: Re: Another dwell question |
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So I've been driving the bus for the last three days with no issues. I think that the answer may have been a short from a semi- exposed wire in the FI harness. I've not had the issue since I taped up that rubbed through spot.
Knocking on wood here...
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'67 13 Window
'77 Westy
'69 Sunroof Beetle
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mikedjames
Samba Member
Joined: July 02, 2012
Posts: 2743
Location: Hamble, Hampshire, UK
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| Posted: Tue Dec 15, 2015 2:14 pm Post subject: Re: Another dwell question |
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Given the way the problem comes and goes, and you have been indicating some fluctuation on the voltage on the coil terminal.
It could be worth bridging across from the battery to the coil, bypassing what might be a defective ignition switch, which is killing the ignition momentarily, or there is an almost-broken wire core somewhere in the loop from the battery to the coil.
What may be happening is that the connection welds up then vibrates free, producing an intermittent fault that clears itself or reappears when you start the engine and it jumps around more as it starts.
Another source of bucking I have found was that the centre lead from the coil would drop out, and the spark would flashover to the centre lead and on to the distributor as normal but weaker spark, or one of the other coil terminals dependent on the dampness of the nose of the coil. This led to bad idle, or bucking at certain RPM, but the vibration from the engine would cause it to even out at certain RPMs.
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Ancient vehicles and vessels
1974 VW T2 : Devon Eurovette camper with 1641 DP T1 engine, Progressive carb, full flow oil cooler, EDIS crank timed ignition.
Engine 1: 40k miles (rocker shaft clip fell off), Engine 2: 30k miles (rebuild, dropped valve). Engine 3: a JK Preservation Parts "new" engine, aluminium case: 26k miles: new top end.
Gearbox rebuild 2021 by Bears.
1979 Westerly GK24 24 foot racer/cruiser yacht Forethought of Gosport.
1973 wooden Pacer sailing dinghy |
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Wed Dec 23, 2015 10:09 pm Post subject: Re: Another dwell question |
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Drove it for more than a week with no issues.
Went to drive it on a holiday trip of about 50 miles. Started bucking about 10 miles into it. Immediately turned around and went home to switch cars. After christmas I will be fixing this BS for good.
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'67 13 Window
'77 Westy
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1975 Kombi
Samba Member
Joined: August 12, 2007
Posts: 2452
Location: Acton, Ontario, Canada
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| Posted: Wed Dec 23, 2015 10:56 pm Post subject: Re: Another dwell question |
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You might have to pull the entire FI system and go through each piece to check it.
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Brett
“He’s decieving you boy! Reach into his pocket and take what he’s got.” Mr. Crabbs.
75 Westy auto
03 Jetta TDI
71 SB
74 Westy
Licensed pilot (single engine land VFR)
--
Rust In Pieces: 72 Bug, 73 Bug, 81 Rabbit LS D 2D, 83 Rabbit D 2D, 84 Jetta TD GL, 85 Jetta D, 68 Z28 RS 302, 91 Passat 16v |
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Wed Jan 06, 2016 3:49 pm Post subject: Re: Another dwell question |
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Same old problem. I will look for sparks tonight after dark. Tcash, I will try this test, but I've replaced the coil, plugs, plug wires, distributor cap.
I will also try the LPS-1 spray, put it doesn't seem to be wet in there.
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'67 13 Window
'77 Westy
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1975 Kombi
Samba Member
Joined: August 12, 2007
Posts: 2452
Location: Acton, Ontario, Canada
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| Posted: Wed Jan 06, 2016 5:21 pm Post subject: Re: Another dwell question |
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Could be just a broken wire somewhere. Also check the resistor pack for broken wires.
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Brett
“He’s decieving you boy! Reach into his pocket and take what he’s got.” Mr. Crabbs.
75 Westy auto
03 Jetta TDI
71 SB
74 Westy
Licensed pilot (single engine land VFR)
--
Rust In Pieces: 72 Bug, 73 Bug, 81 Rabbit LS D 2D, 83 Rabbit D 2D, 84 Jetta TD GL, 85 Jetta D, 68 Z28 RS 302, 91 Passat 16v
Last edited by 1975 Kombi on Wed Jan 06, 2016 5:54 pm; edited 1 time in total |
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Tom Powell
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Joined: December 01, 2005
Posts: 4855
Location: Kaneohe
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| Posted: Wed Jan 06, 2016 5:36 pm Post subject: Re: Another dwell question |
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| 1975 Kombi wrote: |
| Could be just a broken wire somewhere |
Sometimes an old wire will break inside the insulation. It looks good from the outside, but lacks integrity. Ha ole.
Aloha
tp |
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12727
Location: on a bike ride somewhere
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| Posted: Wed Jan 06, 2016 6:12 pm Post subject: Re: Another dwell question |
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| OG Velvet wrote: |
Same old problem. I will look for sparks tonight after dark. Tcash, I will try this test, but I've replaced the coil, plugs, plug wires, distributor cap.
I will also try the LPS-1 spray, put it doesn't seem to be wet in there. |
I was troubleshooting a consistent misfire on a brand new engine last month, and I swapped the cable on the offending cylinder; no change. Odd, so I replaced all the old fraying cables anyway. No start. Put the old cables back on, three cylinders are fine.
The moral of the story, is that the new plug wires didn't fit right out of the box; the copper contact that goes into the cap needs to be fully inserted into the cap, THEN the rubber boot seated. From the box, the contact piece was too far into the rubber boot to allow proper contact.
So with your new parts, you may need to check through to make sure they are jiving. I'm not saying this is your case, because it probably isn't, but you might need to start thinking outside of the box like that.
Good luck,
Robbie
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Wed Jan 06, 2016 6:46 pm Post subject: Re: Another dwell question |
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Cleaned up a ton of connectors. The double relay was pretty dirty.
The blue wire that connects to the regulator and runs the alternator light was barely connected. Could that have had anything to do with it?
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'77 Westy
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Wed Jan 06, 2016 6:47 pm Post subject: Re: Another dwell question |
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| asiab3 wrote: |
| OG Velvet wrote: |
Same old problem. I will look for sparks tonight after dark. Tcash, I will try this test, but I've replaced the coil, plugs, plug wires, distributor cap.
I will also try the LPS-1 spray, put it doesn't seem to be wet in there. |
I was troubleshooting a consistent misfire on a brand new engine last month, and I swapped the cable on the offending cylinder; no change. Odd, so I replaced all the old fraying cables anyway. No start. Put the old cables back on, three cylinders are fine.
The moral of the story, is that the new plug wires didn't fit right out of the box; the copper contact that goes into the cap needs to be fully inserted into the cap, THEN the rubber boot seated. From the box, the contact piece was too far into the rubber boot to allow proper contact.
So with your new parts, you may need to check through to make sure they are jiving. I'm not saying this is your case, because it probably isn't, but you might need to start thinking outside of the box like that.
Good luck,
Robbie |
Thanks Robbie, I did make sure that every wire was seated before I pulled the boots over them.
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'77 Westy
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12727
Location: on a bike ride somewhere
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| Posted: Wed Jan 06, 2016 6:50 pm Post subject: Re: Another dwell question |
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| OG Velvet wrote: |
Thanks Robbie, I did make sure that every wire was seated before I pulled the boots over them. |
I guess I didn't mean for you to actually check those, but just to be critical and think thoroughly through every item you touch when working on the various systems.
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Fri Jan 08, 2016 4:00 pm Post subject: Re: Another dwell question |
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No difference. Still bucking. Ready to drive it off a cliff...
Anyway. If I bought a new distributor that worked, could that be my problem?..
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'67 13 Window
'77 Westy
'69 Sunroof Beetle
'65 Honda Dream |
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1975 Kombi
Samba Member
Joined: August 12, 2007
Posts: 2452
Location: Acton, Ontario, Canada
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| Posted: Fri Jan 08, 2016 4:54 pm Post subject: Re: Another dwell question |
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Do you have a vacuum advance?? If so could you check the little braided ground wire that connects both plates inside the distributor.
_________________
Brett
“He’s decieving you boy! Reach into his pocket and take what he’s got.” Mr. Crabbs.
75 Westy auto
03 Jetta TDI
71 SB
74 Westy
Licensed pilot (single engine land VFR)
--
Rust In Pieces: 72 Bug, 73 Bug, 81 Rabbit LS D 2D, 83 Rabbit D 2D, 84 Jetta TD GL, 85 Jetta D, 68 Z28 RS 302, 91 Passat 16v |
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akscooter
Samba Member
Joined: September 25, 2008
Posts: 528
Location: Eastern Washington
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| Posted: Fri Jan 08, 2016 6:36 pm Post subject: Re: Another dwell question |
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You may want to check your fuel system, I had a problem similar to yours. My bus would run great then run like crap and start bucking, so I pulled the fuel line and little to no pressure. So that being found, I started chasing it. went to the fuel pump and removed the line coming from the tank and found that only a dribble of gas was coming from the tank. I blew up through the hose and ended up getting a face full of gas as it started gushing out..... I dropped the tank and found a few of these round berries from some tree or something that had made its way into the tank somehow...... no more problems after the berries were removed...... it could be possible you may have a obstruction in your tank, start by checking to see if it is flowing properly...
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1949 Ply Special Deluxe
1991 Custom 1200 HD Sportster XLH |
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Sat Jan 09, 2016 9:50 pm Post subject: Re: Another dwell question |
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| akscooter wrote: |
| You may want to check your fuel system, I had a problem similar to yours. My bus would run great then run like crap and start bucking, so I pulled the fuel line and little to no pressure. So that being found, I started chasing it. went to the fuel pump and removed the line coming from the tank and found that only a dribble of gas was coming from the tank. I blew up through the hose and ended up getting a face full of gas as it started gushing out..... I dropped the tank and found a few of these round berries from some tree or something that had made its way into the tank somehow...... no more problems after the berries were removed...... it could be possible you may have a obstruction in your tank, start by checking to see if it is flowing properly... |
My thinking is staring to head this way. I'm going to look into that tomorrow. I put some sea foam in it the other day after my last post, but I am going to change the filter and check the lines as well as fuel pressure.
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Tue Feb 02, 2016 2:22 pm Post subject: Re: Another dwell question |
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I know what you're thinking... This thread again? and no, I have not solved this problem, I have only come to live with it. It does drive just fine about 75% of the time.
I am starting to think that my issue is fuel related. It seems to run better after I add some sea foam. I am planning on checking out the tank this weekend. I have looked through the sender hole (yes, mine has an access hole cut out by PO) and the tank looks fairly clean from what I can see through the hole.
I will check the filter tonight. If the filter is clean, can I eliminate this as the issue?
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12727
Location: on a bike ride somewhere
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| Posted: Tue Feb 02, 2016 3:32 pm Post subject: Re: Another dwell question |
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Ok, there is a lot of info to read here, so pardon my questions please.
What is your fuel pressure at idle? Rev the engine and does it increase with throttle and decrease with decel? When you shut the engine off, does the pressure hold for at least a few minutes?
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OG Velvet
Samba Family Man
Joined: February 24, 2003
Posts: 2168
Location: Portland, OR
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| Posted: Tue Feb 02, 2016 3:47 pm Post subject: Re: Another dwell question |
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| asiab3 wrote: |
Ok, there is a lot of info to read here, so pardon my questions please.
What is your fuel pressure at idle? Rev the engine and does it increase with throttle and decrease with decel? When you shut the engine off, does the pressure hold for at least a few minutes? |
I will get those answers tonight
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Amskeptic
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Joined: October 18, 2002
Posts: 8568
Location: All Across The Country
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| Posted: Tue Feb 02, 2016 9:33 pm Post subject: Re: Another dwell question |
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| OG Velvet wrote: |
| asiab3 wrote: |
Ok, there is a lot of info to read here, so pardon my questions please.
What is your fuel pressure at idle? Rev the engine and does it increase with throttle and decrease with decel? When you shut the engine off, does the pressure hold for at least a few minutes? |
I will get those answers tonight |
2016 Itinerary is up. I'll be happy to serve as your last option before you shove it into the Columbia River...
Colin
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