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Weird running problem on tii (archive)

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Posted by Matthew Cervi on June 26, 2001 at 12:33:40:

At least I think its weird. Can anyone help me identify the problem?

The car runs fine until I get it up to 4000-4500 rpm for more than a couple seconds. Then it acts like the motor dies (problem is worse when the engine has some load like going up hill). If I let up on the gas it recovers briefly. *OR* if I floor it then the engine picks up again (somewhat weakly). 90% throttle runs roughly, 100% is smooth but not as powerful as it should be.

Its that full-throttle thing that I don't get. If it was fuel starvation, shouldn't it happen worse with more throttle?

I adjusted the main mixture screw a while ago too far rich and the plugs were black. I adjusted it leaner a couple days ago thinking that was the problem. Yesterday I replaced the plugs with new ones and the old plugs had returned to white with brown deposits. But I had the same problem driving on the new plugs. All the plugs are consistent in color.

Any ideas of where to look?

Matthew Cervi
'73 tii


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