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> Starts When It Sits For 1 Day, 2days, But Not 4 Days Or 5 Days, 122s with weber conversion
poohbear's h...
post Aug 27 2015, 03:15 PM
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1968 volvo Station wagon,122S
After installing a new weber conversion and it's manifold, I find two problems. One, there's a no start situation if the car sits for few days, even though there's still gas in the carburetor float bowl. Also, possibly unrelated... by the time we adjust this one to run well, we may be running a little rich.
Is there an easy way to check for leakage between the manifold and the engine block?
Could we have an issue with the vacuum from the cylinder? the valves, the pistons? Is there a way to check the vacuum?

Thanks in advance for any suggestions on figuring this one out. We miss our volvo...

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danielm85948
post Aug 27 2015, 05:15 PM
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QUOTE (poohbear's helper @ Aug 27 2015, 04:15 PM)
1968 volvo Station wagon,122S
After installing a new weber conversion and it's manifold, I find two problems. One, there's a no start situation if the car sits for few days, even though there's still gas in the carburetor float bowl. Also, possibly unrelated... by the time we adjust this one to run well, we may be running a little rich.
Is there an easy way to check for leakage between the manifold and the engine block?
Could we have an issue with the vacuum from the cylinder? the valves, the pistons? Is there a way to check the vacuum?

Thanks in advance for any suggestions on figuring this one out. We miss our volvo...

first check you have a good spark from the coil,then at the leads at your spark plug. then take out and smell your spark plug if smell of fuel change the spark plugs,and be sure you have a good earth to your camshaft cover. check the output from your battery.
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poohbear's h...
post Aug 27 2015, 07:37 PM
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Location: USA, Idaho
Drives: 68 volvo



Thanks for your feedback. We will check (or recheck again) the items listed, as time allows us to get to the shop and report back.
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poohbear's h...
post Aug 27 2015, 07:39 PM
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Member No.: 80,590
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Location: USA, Idaho
Drives: 68 volvo



Thanks for your feedback. We will check (or recheck again) the items listed, as time allows us to get to the shop and report back.
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poohbear's h...
post Mar 28 2018, 10:06 PM
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Location: USA, Idaho
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Volvo 122S
This volvo is my partner's but he's asked me to help him with computer conversations as he is not computer savvy.
Time has gone by, since our last post and we've worked intermittently to deal with this problem. In the end we realized our compression was so poor we had to get our engine rebuilt. At this point it also has a new weber carburetor, a new distributor, but old cap and rotor. Reasonably new plugs and wires. Compression is now 135-140 dry on all cylinders, 140-150 wet. He timed it, and we have an orange spark in the window of the little tester. We don't know how to test coil strength, if that might be marginal.
Problem: When he turns the engine over, it will not start. If he continues to try at intervals, it will finally start and run smoothly after about 2 or 3 minutes, but it may be running somewhat rich. He can see that there is gas coming to the carburetor, even during the very first turn of the key. He told me he checked fuel pressure and it's in the right range.
Lately we discover that if he does just One attempt at starting, and then lets it sit untouched for 2 or 3 minutes, it will start fine after the time period has elapsed, but no start possible untill that time has elapsed.
We have checked every way we know for air leaks, and have not found any.
Possibly related... and a little curious: We removed the tube leading from the manifold to the PCV valve (called "crank case breather" in our old manual). When we put a thumb over the tube, we feel the pull of a good vaccumm and the engine RPM slows significantly. When we release the thumb, engine speeds up significantly. When we place the tube back on the PCV valve the *increased* RPM remains, just like it does when we have no thumb on the tube. Should that happen? or do we have a failing PCV valve? He told me that he cleaned it, but there's nothing in the manual on how to check it's function. Instead we see the phrase.... "the remaining fitments call for no special instructions", which makes us laugh... can you guys help? We feel that we're so close.... but still this malingering problem.
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