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Gear Head
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Joined: Sun Aug 14, 2022 4:06 pm

Surging idle issues, after 7 years, possible mechanical issue

Post by DougGraham » Tue Aug 16, 2022 11:23 pm

Hello all, i was on this site several years ago when i first installed the EFI engine in my 67 coupe, tuned it and forgot about it, now in the last year or so [only drive the car a few times a year]. Last year it developed a surge at idle till it warms up, once it warms up to operating temp it is still there but very subtle. After several issues with datalogging that Clint helped me out with i was able to pull a data log, found one bad HEGO, changed both and pulled a good log, i have attached it here. I do not see anything that jumps out at me right away in the log so i thought i would throw it up here for input from the group. I am at work for the next 2 weeks so will not be able to work on it but as soon as i get back home i hope to have a few ideas on what to check.

Thanx in advance.
Doug Graham
1967 Mustang
slot mass air, performer RPM heads, long tubes, 30LbEV's

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