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Old 24 January 2020, 14:01   #1
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Yamaha F150 idle screws

I am told this engine's idle speed is determined by the ECU, but there are two screws on the air intake manifold and they seem to adjust tick over. Does anyone have any experience of these?
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Old 25 January 2020, 01:50   #2
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Obsidan, I have a 2012 F150, so not sure if the procedures are the same?

The TPS needs to be outputting a voltage of 0.7 +/- 0.02v with the throttle butterflies fully closed. Tickover screw wound out fully.

The setup procedure is in the Service Manual, as its a bit long winded to type out here!
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Old 25 January 2020, 01:51   #3
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On mine, one screw does tickover, the other balances the Throttle Bodies between #1 #2 and #3 #4 cylinders.
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Old 25 January 2020, 02:40   #4
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Awesome, thank you. Any chance of a link? Have looked at manuals online and cant see this bit. Thanks again
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Old 25 January 2020, 03:38   #5
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Its in my manual on page 4-18.

I’ll see if I can get link to download manuals?
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Old 25 January 2020, 03:43   #6
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This is for my engine, but you may find one for your year?

https://www.manualslib.com/manual/95...aha-F150a.html
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Old 25 January 2020, 13:52   #7
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Thank you Enzo, thats great. Not the manual I was looking at
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Old 25 January 2020, 15:05   #8
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Shame yours is not the same year, I could have taken readings from my engine!
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