What if I pulled a spark plug wire while it is running..

Bohdan

Greetings Fellow VWers'.

I have a rough idling Thing and in theory it idles as if it is running on three cylinders. So I take off the spark plug wire off of number 1. No difference. I take the plug wire off of 3 no difference. But if I take it off of 2 or 4. It basically dies. I checked compression and it is a bit low on one. I tested spark and I get spark. I got even new plugs. One thing I didn't check was timing. What do you think is the issue? Any help would be appreciated. Have a Great Day!

CraigInPA · Posted: Mon Sep 15, 2014 6:23 am Post subject:

When you say cylinder 1's compression is low, how low? Like 10 lower than the rest, or 40 lower than the rest?

If you consider only the spark plugs as a culprit, my guess would be cylinder 3 is the one not firing.

If you look at it systemically, it sounds to me like a timing issue caused by a worn rotor/distributor, or a cracked distributor cap.

Bohdan · Posted: Mon Sep 15, 2014 8:39 am Post subject:

Cylinder one is 135, 2 is 150 3 is 145 and 4 is 155. but it must be both since the engine revs don't change. Thinking about it, maybe I switched 3 and 1 at the distributor cap? How stupid would that be? I should check that.

GI Joe · Posted: Mon Sep 15, 2014 12:52 pm Post subject:

SilverThing · Posted: Mon Sep 15, 2014 5:44 pm Post subject:

I got my Thing up to 45mph running on two cylinders once! I was flooring it in third gear, but still... Very easy to get wires backwards.
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Bohdan · Posted: Tue Sep 16, 2014 4:54 am Post subject:

Interesting enough. It wasn't switched spark plugs. I switched them anyhow to see what would happen. Definetely runs better the way it was originally. I tweaked the timing and runs much better. However, if I still pull the plug wires, still no difference. Weird....

MacLeod Willy · Posted: Tue Sep 16, 2014 5:03 am Post subject:

Check for a vacuum leak on a gasket or hose. You can use propane on med/low through a rubber hose and aim it around all the connections. You will need to clear the air once in a while. If there is a vac leak the rpm will increase instantly until you remove the hose

60GULFVDUB · Posted: Tue Sep 16, 2014 7:58 am Post subject:

What carburator(s) are you running? It will do that with some single throat dual carbs , but clears up at higher rpm.

Bohdan · Posted: Fri Sep 19, 2014 5:14 am Post subject:

I got a single 40IDF. I am definitely going to get somebody elses opinion on this too. See if they see what I see. Maybe I am gojng nuts. thx


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