Aircooled 2.0 -80 without idle

[Vanagon0034639]

Hi!

My first post here, recently bought a -80 Bus wich is really sound and nice, but I can't get the idling down, it just revs at 1400 with the idling adjustment screw at bottom. I have the Bentley manual and have all the specs but now I'm confused. I tested the auxiliary valve and it works. I measured the breakerpoints, but they had a gap less than 0.1 mm. Maybe this is right due to the dwellangle, couldn't measure this today.
Then I tried to set the ignition. But nowhere in the manual I could find at what rpm the ignition is meant to be set. Is it at normal idle? But just for fun I set the breakerpoints to 0.4 mm, and the idle was suddenly possible to adjust. But not good enough...

I know that I have some cracked vacuumhoses to change before I can adjust everything properly, but I have to set the ignition perfect before I go on.

I also have another kinda strange problem: When the engine is cold it starts in half a second. When warm the starter works slow and the engine hardly starts. The starter isn't old, seems to have been changed some tíme ago, looks like new. The alternator works perfect loading 13.8 volts. The battery is almost new. Can't figure this out...

Greetings from Sweden,
/Chris

[Rozzo]

hi and welcome.
i have mine idling at around 1200 rpm,, i feel that this is better when caught in traffic as more cooling air flows at higher revs. i have not had a problem with this setting. to me it sounds as though the mixture on each carb may be too lean. check all the vacuum hoses first and check that there is no play (lift) in the throttle shafts which can leak air.
for the poor hot starting change the small starter bush (in the bell housing) and thoroughly clean the earth connections between battery and earth,, and between chassis and gearbox.
good luck with it

[HarryMann]

Vanagon003xxx

You don't say what your engine is... presuming 2.0 CU, but I was under impression these have hall-sender ignition, not points
So... please confirm and always quote engine in 1st post https://club8090.co.uk/forum/viewtopic.php?f=2&t=291

Then I tried to set the ignition. But nowhere in the manual I could find at what rpm the ignition is meant to be set. Is it at normal idle? But just for fun I set the breakerpoints to 0.4 mm, and the idle was suddenly possible to adjust. But not good enough...

I know that I have some cracked vacuumhoses to change before I can adjust everything properly, but I have to set the ignition perfect before I go on.

You can't set the ignition perfect before doing the vacuum hoses.. if by that you mean the adv/ret vac hoses

Perhaps you mean setting the static timing position? Make sure you scribe the current one up accurately before you move the dizzie, always a good reference and insurance policy.

Wiki has some stuff on the a/c timing, you'd need to read it all to find what you want...

https://club8090.co.uk/wiki/Pe ... gnition_01
https://club8090.co.uk/wiki/Pe ... gnition_02

[Vanagon0034639]

Ah, forgot, I have the Bosch injection, think it is L-jetronic. The carbu-variants where never sold here in sweden.

I don't have the hall-sender, just ordinary points. This injectionsystem should be bulletproof and very reliable, but, of course, if there's small leaks everywhere nothing works as it should.

What do you guys think about my starting-issue then? Can it really be as easy as a poor ground connection?? Why is starting perfect when cold?

Thanks in advance!

Greetings!
/Chris

[HarryMann]

OK, please put your location your profile, thanks

Why is starting perfect when cold?

I sense someone else will be along to make short work of this soon

In the meantime, all I can think of are:

a) Injectors are dripping (rich at cold-start, flooded for hot-starts);
b) fuel pump pressure/ cold-start sender/ AFM flap/ blocked filter;
c) starter spigot bush (if any) in belhhousing is worn.

[Vanagon0034639]

OK, I'll probably just confusing with too many questions and details...

Just one question: At wich RPM is the timing meant to be set?

Have to know this cause I can't find it in the Bentley manual.

Thanks,
/Chris

[Grun]

OK, I'll probably just confusing with too many questions and details...

Just one question: At wich RPM is the timing meant to be set?

Have to know this cause I can't find it in the Bentley manual.

Thanks,
/Chris

I have an Old Autobook manual which includes the 2 litre Aircooled engine, and the last model listed is a GD engine which they quote as having the timing at 7.5 ATDC checked at 850 to 950 RPM, with the vacuum hoses CONNECTED.
The points should be 0.41mm and the dwell angle 44 to 50, according to the book.
May just give you a basic setting until you find the genuine figures.

Mike

[Vanagon0034639]

Thanks!

I've been struggling about with the auxiliary air regulator. Bentley book says that the two terminals at regulator shall read 30 ohms. Mine does to.
To check that it closes at warm engine one shall blow through it. It is still possible to blow a little through it when warm, it doesn't block totally.
Shall it be totally blocked when warm or is there some sort of small bypass letting air through? When looking at the valve inside the regulator it seems to be closed... But still possible to blow through a little.

Thanks in advance,
Chris

[andysimpson]

Has the auxillary air valve got a 7mm nut on it?

[Vanagon0034639]

Yes, I think there was a little nut at the side, locked with some yellow paint. Is it some sort of adjustment-gizmo?

/Chris