f150 surging idle

[tarheel53]

Thanks Boscoe .......... hope to tackle it next weekend.

JB

[Mac_green_gill]

Any vacuum leak can cause idling/running issues.

However, IME, if you had a vacuum leak, the idle wouldn't be hunting, it'd be crappy, or higher (leaning out). At the end of your first post, I missed its staying at 1100 vs 750. It might be worth your while to re-check the rubber gaskets especially between the intake manifold and head. It wouldn't be hard to have one move/drop during installation.

Re the temp of the ISC, yes, 200F of the unit itself would indicate its failed / failing. The clicking is VERY obvious and if you pay attention, you can hear it with the cowl on (easier with it off).. If it idled good before, I kinda doubt the ISC is the issue.


seals #15 and #19 specifically:

http://www.boats.net/parts/search/Ya...202/parts.html

i have a f150 thats doing the same thing i have replaced the ivac im trying to figure out the ohms across the ivac im having really rough idle and when going into gear slowly it dies out but i can throttle fast and it run like a top

[TownsendsFJR1300]

Read this paying attention to post #21:..

https://www.yamahaoutboardparts.com/...-problem/page2



https://vimeo.com/264625510

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