[ Total Views: 941 | Total Replies: 10 | Thread Id: 111132 ] |
|
hulbyw
Insano Dub Head
Posts: 802
Threads: 130
Registered: September 28th, 2009
Member Is Offline
Location: Melbourne
Theme: UltimaBB Pro Blue ( Default )
Mood: I'm OK, RU?
|
posted on June 14th, 2016 at 06:22 PM |
|
|
Help Needed. '68 Beetle Misfiring
I have a beetle with a quite worn 1641 and standard carb. It has a 009 with Compufire, I made the mistake of giving it some love, such as filling it
with BP ultimate, adjusting the valves and replacing the plugs and ever since it is misfiring under load. Starts ok but when revved or under load pops
and farts.
To date I have changed the plugs again and new copper ignition leads. This fixed it for a day then it went back to worse popping and farting.
I have now put in a new rotor and dissie cap, new fuel filter and removed the carb and cleaned it and blew out the jets and orifices with compressed
air.
It now goes a bit better but still popping and farting under load. Any suggestions to fix it would be really welcome
Cheers.......Wayne
|
|
bevoracing
A.k.a.: Tony Beven
Officially Full-On Dubber
Posts: 326
Threads: 36
Registered: January 18th, 2009
Member Is Offline
Location: Mount Pleasant SA
Theme: UltimaBB Vintage
Mood: Leaning against the shed wall !.
|
posted on June 14th, 2016 at 06:37 PM |
|
|
Wayne
I would re-do the valves. Sounds like they might be too tight when it gets hot. Give it a go, nothing to loose.
Good luck.
Tony
|
|
Bizarre
Super Moderator
The artist formerly known as blue74l
Posts: 12753
Threads: 731
Registered: August 25th, 2002
Member Is Offline
Location: Abbotsford, Sydney
Theme: UltimaBB Pro Blue ( Default )
|
posted on June 14th, 2016 at 07:04 PM |
|
|
start from the beginning
Do a full tune up - valves, points, timing
Futue te ipsum!!!
|
|
splitbus
Seriously Crusin Dubber
Posts: 162
Threads: 12
Registered: January 22nd, 2009
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
|
posted on June 14th, 2016 at 08:52 PM |
|
|
Quote: | Originally
posted by bevoracing
Wayne
I would re-do the valves. Sounds like they might be too tight when it gets hot. Give it a go, nothing to loose.
Good luck.
Tony
|
Do a compression test on each cylinder, hopefully you haven't cracked the head changing the plugs
Error |
Sorry, you must be a registered user in order to download attachments. |
|
Cheers, Mike
------------------------------------
| o*/o | 55 split screen
I don't have a bucket list, I have a f^%k it list a mile long
|
|
beetleboyjeff
A.k.a.: Jeff Walsh
Custom Title Time!
Posts: 1773
Threads: 40
Registered: February 13th, 2009
Member Is Offline
Location: Port Macquarie
Theme: UltimaBB Pro Blue ( Default )
Mood: Drive bugs hard
|
posted on June 14th, 2016 at 11:39 PM |
|
|
I have had Compufires go before, and this is one of the ways they go. You could try putting points & a condenser in it and see if that helps -
they are a lot cheaper than trying another Comufire (unless you have another one or can borrow one).
From your ole' mate Jeff
|
|
vduboy
Insano Dub Head
Posts: 702
Threads: 41
Registered: October 6th, 2012
Member Is Offline
Theme: UltimaBB Streamlined2
Mood: Dying to get more buggy building time..
|
posted on June 15th, 2016 at 12:10 PM |
|
|
Get rid of the high octane too. Unless the 1641 is a high comp motor you wont need more than 91. Steer clear of ethanol though. Would explain why the
problem went away after new plugs.. Fouling up due to the fuel.
It will all be OK in the end, if it's not OK it's not the end!
|
|
psimitar
Son of Jim - Creator of Good
Posts: 2506
Threads: 148
Registered: January 1st, 2009
Member Is Offline
Location: North East Melbourne, VIC
Theme: UltimaBB Psyche Blue
|
posted on June 15th, 2016 at 10:11 PM |
|
|
Yea, dilute the 'good stuff' fuel with normal 91 and see if it gets better.
The old dak dak is low compression and higher octanes have been known to cause running issues cos high octane needs higher compression to burn
properly.
madness is in the eye of the beholder
|
|
vw54
Super Administrator
Always Waiting 4 Friday
Posts: 16723
Threads: 378
Registered: August 26th, 2002
Member Is Offline
Location: Sunny Sydney
Theme: UltimaBB Pro Blue ( Default )
Mood: Oval resto ongoing
|
posted on June 16th, 2016 at 07:48 AM |
|
|
As per above start with the basics
Tappets, Timing, Plug gap etc
then look at filter and lines make sure you have flow
|
|
hulbyw
Insano Dub Head
Posts: 802
Threads: 130
Registered: September 28th, 2009
Member Is Offline
Location: Melbourne
Theme: UltimaBB Pro Blue ( Default )
Mood: I'm OK, RU?
|
posted on June 18th, 2016 at 09:42 PM |
|
|
Thanks guys. Doubt it is the fuel octane as I have been using Ultimate for some time. I have rechecked the valves and found the exhaust valve on #2
was tight again (same as last time). I re did all the valves but it made only a slight improvement. Too much other stuff happening right now so I will
get back to it after Valla and let you guys know when I find the problem. Cheers and thanks again
|
|
psimitar
Son of Jim - Creator of Good
Posts: 2506
Threads: 148
Registered: January 1st, 2009
Member Is Offline
Location: North East Melbourne, VIC
Theme: UltimaBB Psyche Blue
|
posted on June 18th, 2016 at 10:32 PM |
|
|
If a valve clearance keeps going tight then it could mean the valve seat is sinking. Or as the exhaust valve the stem could be stretching and getting
ready to break.
I can't think of any other reason for that to be happening.
madness is in the eye of the beholder
|
|
68AutoBug
A.k.a.: Lee Noonan
Aircooled Master
Beetle Restorer - Experience over 138% - YIKES --
Posts: 11654
Threads: 449
Registered: August 31st, 2002
Member Is Offline
Location: SCONE in UPPER HUNTER VALLEY NSW
Theme: UltimaBB Pro Yellow
Mood: Really Mentally Ill - all of the time -
|
posted on June 18th, 2016 at 11:12 PM |
|
|
Hi,
Have You checked the Hi riser heater pipe underneath the inlet manifold.
I have had a couple of them rust out which lets the manifold get very COLD if the outside temp is coolish.. it also allows the exhaust to leak...
Air Cooled VW engines don't like any leaks in the exhaust or inlet manifolds etc...
it looks like it maybe a cracked head...
I presume You have used a timing light on it...
I don't like 009's especially if they aren't genuine..
I don't believe using 98 octane should cause problems, E91 or E95 I wouldn't use.. [ethanol]
Did You use anti-seize or similar on the spark plugs??
I do on ALL alloy heads...
I did have a bad spark plug a couple of years ago... it tested Ok initially and it did go a few hundred KLMs before it started to play up.. the engine
idled and drove Ok except on the highway/expressways etc over 90KMH.. it was like half spark on & off... but the engine didn't misfire etc..
Best of Luck
LEE
Quote: | Originally
posted by hulbyw
I have a beetle with a quite worn 1641 and standard carb. It has a 009 with Compufire, I made the mistake of giving it some love, such as filling it
with BP ultimate, adjusting the valves and replacing the plugs and ever since it is misfiring under load. Starts ok but when revved or under load pops
and farts.
To date I have changed the plugs again and new copper ignition leads. This fixed it for a day then it went back to worse popping and farting.
I have now put in a new rotor and dissie cap, new fuel filter and removed the carb and cleaned it and blew out the jets and orifices with compressed
air.
It now goes a bit better but still popping and farting under load. Any suggestions to fix it would be really welcome
Cheers.......Wayne
|
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
|
|