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Kindredz Samba Member
Joined: May 15, 2014 Posts: 28 Location: Nashville
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Posted: Mon Jan 16, 2017 2:08 pm Post subject: 1915cc backfires at highway speeds and dies |
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73 super beetle with newer 2 year old 1915cc with Empi dual 34 epc carbs. Drives great for last couple of years, starts easy runs around town with no problems. When i drive on highway for about 30 minutes at 65-70mph it starts to act like its running out of gas and putters, then when gas applied backfires. more gas more boging down and backfires more until it dies. immediatly restarts up and runs again for about 20 minutes and dies again. if sit for 15-20 minutes runs again for 30 minutes and dies again. I have adjusted the valves, rebuilt the carbs floats. installed a new electronic fuel pump, new fuel filter. did timing and new dist cap. last time it died i removed the air filters and white smoke came out, but the j tubes do squirt fuel. checked the fuel filter and no fuel in it. as i restarted it, i gave gas and fuel started to fill up the fuel filter about half way. It use to run on highway no problem, even installed the hood extenders. Has all tins in place and new seals.
lost! |
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ps2375 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Mon Jan 16, 2017 2:25 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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Is tank vented? Either via vent line or filler cap. |
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williamM Samba Member
Joined: August 07, 2008 Posts: 4333 Location: southwest Arizona
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Posted: Mon Jan 16, 2017 2:29 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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Would throw a condenser at the ignition- if that does not work- go through the scientific- fuel/ fire/ compression test. get back to us _________________ some days I get up and just sit and think. Some days I just sit.
opinion untempered by fact is ignorance.
Don't step in any! |
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VERTED71 Samba Member
Joined: August 28, 2014 Posts: 345 Location: EWA KAI
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Posted: Mon Jan 16, 2017 2:37 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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williamM wrote: |
Would throw a condenser at the ignition- if that does not work- go through the scientific- fuel/ fire/ compression test. get back to us |
X2....I had a similar issue a while back, turned out to be the points or condenser. I say or because I changed them both at the same time.
Good luck. _________________ Aloha'z and have a great day!
71 Super Beetle Vert
15x4.5 Front
15x6.5 Rear
155/60R15 74T tires FRONT
205/65/15 tires REAR
1600 Dual Port
Progessive Carb
Electronic Ignition
Tri Mil "hotdog" exhaust |
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Starbucket Samba Member
Joined: April 30, 2007 Posts: 4007 Location: WA
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Posted: Mon Jan 16, 2017 3:05 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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Sounds like rust/crap in tank blocking fuel pick-up, is the filter clean and when was the last time it was changed? Might be old cracked rubber lines leaking air. Back firing usually means lean fuel/air mix or timing way off (you didn't remove the wires from the cap before this started did you?). Think back what was changed before this started. Good luck trouble shooting you will get a lot of help here. |
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Tim Donahoe Samba Member
Joined: December 08, 2012 Posts: 11739 Location: Redding, CA
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Posted: Mon Jan 16, 2017 3:20 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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x 3 on the condenser.
Tim _________________ Let's do the Time Warp again!
Richard O'Brien |
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miller0358 Samba Member
Joined: November 07, 2007 Posts: 1200 Location: northford,ct
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Posted: Mon Jan 16, 2017 3:36 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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X-4 on the condenser. Text book symptom. Jeff |
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vamram Samba Member
Joined: March 08, 2012 Posts: 7276 Location: NOVA
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Posted: Mon Jan 16, 2017 3:52 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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What kind of a fuel pump are you using? _________________ Eventually, "we are what we pretend to be.’”
Give peace a chance - Stop Russian-Soviet Aggression!!
'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...waiting it's turn in line behind '74.
Click to view image
Save the Supers!! |
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Kindredz Samba Member
Joined: May 15, 2014 Posts: 28 Location: Nashville
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Kindredz Samba Member
Joined: May 15, 2014 Posts: 28 Location: Nashville
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Posted: Mon Jan 16, 2017 5:13 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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williamM wrote: |
Would throw a condenser at the ignition- if that does not work- go through the scientific- fuel/ fire/ compression test. get back to us |
i have a 09 with electronic ignition pertronix, no condenser |
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Kindredz Samba Member
Joined: May 15, 2014 Posts: 28 Location: Nashville
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Posted: Mon Jan 16, 2017 5:14 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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ps2375 wrote: |
Is tank vented? Either via vent line or filler cap. |
the tank is stock 73 super, the filler cap is the basic metal vw cap, don't believe its not vented. as for a vent line i would have to look. |
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Kindredz Samba Member
Joined: May 15, 2014 Posts: 28 Location: Nashville
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Posted: Mon Jan 16, 2017 5:19 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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williamM wrote: |
Would throw a condenser at the ignition- if that does not work- go through the scientific- fuel/ fire/ compression test. get back to us |
i checked the plugs no oil, changed to new. compression came in at 110-115 all around. had a regulator on the fuel line set at 1.5, moved it to 3. checked valve spacing, all at .006 but #2 was tight(couldn't get spacer tool in-between) and needed adjusting. still stalling once driven on hwy for 30+ minutes. |
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Kindredz Samba Member
Joined: May 15, 2014 Posts: 28 Location: Nashville
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Posted: Mon Jan 16, 2017 5:26 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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Starbucket wrote: |
Sounds like rust/crap in tank blocking fuel pick-up, is the filter clean and when was the last time it was changed? Might be old cracked rubber lines leaking air. Back firing usually means lean fuel/air mix or timing way off (you didn't remove the wires from the cap before this started did you?). Think back what was changed before this started. Good luck trouble shooting you will get a lot of help here. |
fuel filter changed last spring, does look dirty(will pick one up).
checked the timing and discovered that my pully is the one with a notch(front) and a v notch(rear on pully) at 5*Atdc and had set the timing last spring at the v notch. Tis was wrong! So I measured 7/16 from the notch on front of pully to make it 7*btdc and retimed. still stalling |
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williamM Samba Member
Joined: August 07, 2008 Posts: 4333 Location: southwest Arizona
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Posted: Mon Jan 16, 2017 8:19 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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can you run round and check the fuel bowl after it stalls easy way is mirror and look for accelerator pump out put.- can also remove the brass plug above and to rear of adjustment needle- but have rag to soak it up.
Solid state ignition module fail too. If listening to the radio your ignition is on- that can over heat that system-- wiring the coil backwards can have the same --
Best way to set timing is with a good TDC mark and an adjustable timing light-
run up to 2800 rpm and set to 28 degrees. let idle fall where it may. _________________ some days I get up and just sit and think. Some days I just sit.
opinion untempered by fact is ignorance.
Don't step in any! |
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Dougy Dee Samba Member
Joined: August 21, 2004 Posts: 1668 Location: Niagara Region, CANADA
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Posted: Tue Jan 17, 2017 5:43 am Post subject: Re: 1915cc backfires at highway speeds and dies |
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Pertronix requires a full 12 volts or it will crap out as you are describing.
Either your battery or gen/alt/voltage regulator is failing.
Edit: could also be battery connections corroding or moisture under the Pertronix plate. |
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andk5591 Samba Member
Joined: August 29, 2005 Posts: 16754 Location: State College, PA
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Posted: Tue Jan 17, 2017 7:45 am Post subject: Re: 1915cc backfires at highway speeds and dies |
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Quote: |
checked the fuel filter and no fuel in it. |
Anybody read this? Tank vent is first thing to check - Second thing is (as mentioned) crap clogging the spigot and also you can have crud in you main fuel line.
Here's a test. Disconnect your fuel line at the carb and run a hose into a gas can. Turn on ignition (disconnect your hot lead to coil) and the pump should start pumping fuel. Should have a nice steady stream - do it for more than a couple minutes to see if the flow drops. _________________ D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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DeathTrap Samba Member
Joined: February 26, 2004 Posts: 1757 Location: Sacramento/Vermont
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Posted: Tue Jan 17, 2017 8:51 am Post subject: Re: 1915cc backfires at highway speeds and dies |
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Them little fuel filters plug without notice.
Just slime or invisible coagulants from various fuel blends not mixing well or dislodging slime will plug the filter and with no noticeable indications. |
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williamM Samba Member
Joined: August 07, 2008 Posts: 4333 Location: southwest Arizona
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Posted: Tue Jan 17, 2017 4:55 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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they can also appear empty, but they are just vapor locked and passing fuel. _________________ some days I get up and just sit and think. Some days I just sit.
opinion untempered by fact is ignorance.
Don't step in any! |
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Starbucket Samba Member
Joined: April 30, 2007 Posts: 4007 Location: WA
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Posted: Tue Jan 17, 2017 5:34 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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Check all wires going through the firewall or along the back and front of the motor for any rub through. On my 70 Ghia I had a wire drop down between the motor tin to body rubber seal and it rubbed through just enuff to barley short the wire so that the motor would slow down and backfire and finally lose all power and die, sit for a min. and it would fire up and run till the same thing would happen again. Had me stumped for a long time but finally stumbled on it. |
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Kindredz Samba Member
Joined: May 15, 2014 Posts: 28 Location: Nashville
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Posted: Tue Jan 17, 2017 8:42 pm Post subject: Re: 1915cc backfires at highway speeds and dies |
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andk5591 wrote: |
Quote: |
checked the fuel filter and no fuel in it. |
Anybody read this? Tank vent is first thing to check - Second thing is (as mentioned) crap clogging the spigot and also you can have crud in you main fuel line.
Here's a test. Disconnect your fuel line at the carb and run a hose into a gas can. Turn on ignition (disconnect your hot lead to coil) and the pump should start pumping fuel. Should have a nice steady stream - do it for more than a couple minutes to see if the flow drops. |
thanks for reply.
i removed tank, added all new lines from front to carbs. added new electric fuel pump(4-7lbs) with regulator at 3. new fuel filter moved from engine bay to above the wishbone under car. tried your test, olde pump flowed fine, changed to new one anyway. everything ran great but when i gunned it, next time i applied gas it bogged down? to much pressure now and flooded? |
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