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Sun Aug 17, 2003 11:41 am

I'm not sure. But dude owns his own VW repair shop and had about 20 vw's around his shop. And he has a 70 transporter that he has used for a daily driver for 14 years. All I know is that I used better gas like he said, and I haven't had it diesel on me since.

Does anyone use any additives for their gas at all?

Sun Aug 17, 2003 11:58 am

Sun Aug 17, 2003 12:02 pm

NuggJugg wrote: I'm not sure. But dude owned his own VW repair shop and had about 20 vw's around his shop. And he has a 70 transporter that he has used for a daily driver for 14 years. All I know is that I used better gas like he said, and I haven't had it diesel on me since.

...

Does anyone use any additives for their gas at all?

my post was no relfection on the dude you deal with, I was just saying it sounds odd that's all, they are electric and electric stuff burns up/ breaks at some point...

IMO.... run the grade octane that works best in YOUR car... some get by with 87 some may need the 89 or the highest premium they can get to avoid ping/run on...
additives are a huge waste of $$ ( again IMO), at least in an aircooled VW engine

Sun Aug 17, 2003 12:15 pm

keifernet wrote:

my post was no relfection on the dude you deal with, I was just saying it sounds odd that's all, they are electric and electric stuff burns up/ breaks at some point...

I know. I thought it was a little odd too being as electronics suck.... :)

Fri Aug 16, 2024 6:38 am

I've been having a dieseling issue for a short while on my bus (1971, 1600dp). During tune-up yesterday my timing was spot on (28 at max rpm) as well as my dwell (aprox 48-49). I had a couple valves on the tight side, but nothing troubling.

My bus has dual kadrons without chokes so I'm just trying to figure out my next step. Would my carbs still have the anti-dieseling device? I read below that is totally separate from the choke. I suppose I should just pull the plugs and inspect them as running rich may cause this?

Admittedly, I'm intimidated by my dual carbs so don't really want to start messing with them unless absolutely necessary. The bus is running fantastically other than this one issue.

Thanks!

Fri Aug 16, 2024 8:03 am

Karon carbs do not have any anti-diesel feature. Of all the carbs I work with, they diesel the most, especially when idle is set to stock emissions-based spec.

If your car diesels, put it in fourth gear, let the clutch out an inch or two just to start slowing it down, then turn the key off. The slight drag of the clutch will prevent run-on and engine damage.

Robbie

Fri Aug 16, 2024 11:58 am

not specific to vw ,but give some causes of dieseling
https://community.cartalk.com/t/car-dieseling-after-shut-off/103791/7

Fri Aug 16, 2024 12:23 pm

If the electric choke does not move anything when the power is applied, the engine will idle rich at all times. If you then drive gently between idling, it will stay rich, soot up until it diesels.

If you drive it hard, the choke flap is automatically moved by the air flow and a vacuum system, so the engine runs leaner anyway.

The difference may be the difference between driving round town=soot, and driving miles at high speed = clearing soot.

The idle shutoff valve is meant to stop the fuel flow in the idle circuit and kill the dieselling.

And they do fail, and people cut the tip off the moving part that it operates so that even if it clicks as though it is operating, it does nothing. It is worth inspecting it, and checking there are two connections from the coil to the carburettor- the disc like choke and the small cylindrical shutoff solenoid.

With a progressive carburettor, you can also end up in a dieselling situation, and no idle shutoff valve, if you also leave the wire off the electric choke.

But in the end, dumping the clutch gently to stall the engine from idle uses much smaller forces on components than revving the engine and dumping the clutch to pull away from the lights.

Fri Aug 16, 2024 1:29 pm

Thanks for the tip, Robbie, I'll give that a go. Interestingly, when I took it on a long highway stretch at 55-60 for about 30 miles it didn't diesel, so perhaps it is partly the highway (lean) vs around town (rich) contributing too. I definitely don't beat on it and at times think I baby it a little to much but you know....it is my baby.

I try to use the higher octane fuel since it is ethanol free but it gets the cheaper stuff when I don't fill it so I'll be more consistent with that too.

Thanks again!

Sat Aug 17, 2024 6:17 am

Get a can of Gumout or Berrymans B12 Chemtool and add it to half a tank of gas and be done with that.

Sat Aug 17, 2024 10:40 am

It's been my norm to let the clutch out a little with the tranny in gear for so long that I no longer think about it, its just automatic.

Sat Aug 17, 2024 12:21 pm

Just to clarify, I only slow the engine down a little with the clutch, then use the key for shutdown. I don’t intentionally stall the engine with the clutch.