pre-ignition, running on

Shane-o Learner Dubber

1 post · joined Nov 2004 · 9 Nov 2004, 7:43 pm

#260726

hello to all:cussing

my 74 kombi (1800 twin carb standard-manual) has the problem of running on when switching off the motor after driving: by 'running on' I mean the engine won't shut down 'cleanly' (it wants to keep going even though the key has been switched off!). This results in
the motor making a coughing and wheezing sound most every time; a short drive 'sometimes' or 'mostly' will see the engine shut down cleanly, but it really does vary. its like...will it do this time?

heads were replaced 20 000klm ago. gets regularly serviced.
oil change, points, valves etc. has had a carbie kit through both carbs. changed the coil.

am 'busting' to cure this problem. any advise, help soooo greatly appreciated

thanks Shane-o

Midlife crisis Nartispuddlejumper, Bureau of Toxicity

2,282 posts · joined May 2003 · 9 Nov 2004, 8:37 pm

#260768

Hi Shane
I had this trouble with my fastie it turned out that the vac advance on my dissy was in full advance at idle.

hope this helps

marc

If you can't laugh at yourself you can't laugh at anyone else! Because life is to short not to LAUGH

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 9 Nov 2004, 8:38 pm

#260772

several things can cause this

too advanced timing
too rich a mixture in carbs
carbon build in heads

are a few things that jump to mind

Futue te ipsum!!!

MickH Hairy Gutted Sloth

3,389 posts · joined Sep 2003 · 9 Nov 2004, 9:30 pm

#260815

check yer shut off solenoids(or lack of them)on your carbies. Sometimes when they are rebuilt blanks are put in(ends cut off) Also check your dizzy mechanism and timing as mentioned above:blah

tssnq.com.au

mnsKmobi Wolfsburg Wizard

589 posts · joined Aug 2002 · 10 Nov 2004, 12:03 pm

#261110

I had this problem with my kombi and I fixed it by setting the valves. I know you said in your post that the valves were done but it is still worth checking.

ratty 63 Custom Title Time!

1,083 posts · joined Oct 2003 · 10 Nov 2004, 10:36 pm

#261512

I have this problem with my 1200 in my '63 when I run it on Unleaded. I normally run it on Premium and it doesn't have a problem.

Try switching to Premium (if you are not already using it) and see if this helps. If not, start looking at all the things listed above.

Cheers

R 🙂

40hp, 6V and ...er... slowly making improvements 😂

It's nice to be important, but it's more important to be nice!

Founding member of the Gold Coast Dub Club Inc. 🙂