Left bank engine problems

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Robert 411
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Left bank engine problems

Unread post by Robert 411 » Fri Dec 01, 2017 9:47 am

I have a 66 corvair monza 140 and the left side exhaust not hot it's warm I can grab the exhaust pipe. The right side is hot, so I'm thinking maybe one cylinder is firing on the left, but not all three. It's smells like it's rich on the left. What could be my problem?

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Jerry Whitt
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Re: Left bank engine problems

Unread post by Jerry Whitt » Fri Dec 01, 2017 10:52 am

With the engine running, a simple test will lead to a solution. Go to the distributor cap, then pull one spark plug wire at a time. Note what happens.
If a cylinder is not firing, there will be no change in idle speed. Do all 6 cylinders.

Now do a compression test of those cylinders that did not change speed. While the plugs are out inspect for fouling.

Let us know of your results.
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terribleted
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Re: Left bank engine problems

Unread post by terribleted » Fri Dec 01, 2017 11:22 am

Jerry Whitt wrote:
Fri Dec 01, 2017 10:52 am
With the engine running, a simple test will lead to a solution. Go to the distributor cap, then pull one spark plug wire at a time. Note what happens.
If a cylinder is not firing, there will be no change in idle speed. Do all 6 cylinders.

Now do a compression test of those cylinders that did not change speed. While the plugs are out inspect for fouling.

Let us know of your results.
This is always a good place to start.

Could also possibly be a malfunctioning primary carb on the cold side. Have seen plenty engines run pretty well on 3 cylinders, idle smooth etc. Every time that I can recall when I have found what you describe (assuming the engine seems otherwise ok as in decent idle no nasty noises etc.) it has been related to what I call a dead carb. Blocked idle circuit at least. Try this....with engine idling using the palm of you hand, block the top of the left side primary carb. What does the engine do? Does the idle slow, or does the engine die, little or no change? Now try the same thing with the right side primary. If the right side kills the engine and the left has not much or little impact you have likely found an issue with the left primary carb.
Corvair guy since 1982. I have personally restored at least 20 Vairs, many of them restored ground up.
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64powerglide
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Re: Left bank engine problems

Unread post by 64powerglide » Fri Dec 01, 2017 4:01 pm

Did you check the spark plugs?? Are they wet or dry??
64Powerglide, Jeff Phillips

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Wagon Master
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Joined: Thu Jul 28, 2011 6:36 pm

Re: Left bank engine problems

Unread post by Wagon Master » Sat Dec 02, 2017 6:08 am

Jerry Whitt wrote:
Fri Dec 01, 2017 10:52 am
With the engine running, a simple test will lead to a solution. Go to the distributor cap, then pull one spark plug wire at a time. Note what happens.

In my opinion this is not a good idea if you are running electronic ignition. This test is done better if you slid the cap boots back and slide a paper clip down along side the wire then attach a ground wire one at a time. Simply pulling a wire can cause a high voltage arc inside the cap to strike the pickup/module damaging it. Also while it's idling place your hand over the top of each carb. one at a time, sealing it off, and see if engine almost dies or continues to run. Plugged idle circuits are common on occasionally run engines.

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