Idle Variation

Tech tips and how to's

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yusef
Roadster Nut
Posts: 62
Joined: Mon Apr 30, 2018 11:44 am

Idle Variation

Post by yusef »

Hello all,

Would an SU throttle shaft leak cause idle variation? I would think it would just raise the idle.

Thanks,
Joseph
todd lorber
Roadster Fanatic
Posts: 440
Joined: Sun Dec 09, 2007 5:58 pm
Location: Los Angeles

Re: Idle Variation

Post by todd lorber »

Yes, worn shafts definitely can cause idle to wander. However, I have rebuilt throttle shafts and still had the problem. I recently put in new needles from Z Therapy and my idle is rock stable, and the entire power band is extremely smooth and consistent.

You can shoot some brake cleaner in near the throttle shaft while the car is idling to see if it effects rpm's.
yusef
Roadster Nut
Posts: 62
Joined: Mon Apr 30, 2018 11:44 am

Re: Idle Variation

Post by yusef »

I sprayed some carb cleaner at the throttle shafts and engine rpm changes, so it's confirmed I have a leak. I just figured leak would mean more air-flow and thus higher rpm, not wandering rpm. Thanks for the note about the needles.