Engine/Drivetrain Vibration Issues

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Engine/Drivetrain Vibration Issues

09-09-2007, 02:45 AM

Post: #14

jondee86 Offline

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Posts: 947
Joined: Apr 2007
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Fuel saving...

Fuel cut is an economy feature on most modern ECU's. If high manifold
vacuum, closed throttle and rpm above approx 1500 all exist at the same
time, the ECU will shut off the injectors. These three conditions are typical
of closed throttle overrun (deceleration).

It is a standard feature of all 4AGE ECU's as far as I know. But I don't
know if the SAFC will override this feature. If you have a Air/Fuel ratio
gauge, you can tell when fuel cut occurs, as the A/F ratio will become
very great >60:1 or more.

The difference between fueling and not fueling on overrun has an affect
on gear tooth loadings, and hence the possibility of "chattering" of the
gear teeth.

Does the rattling happen only in one gear, or can it be heard in several ??

Cheers... jondee86

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

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Messages In This Thread

Engine/Drivetrain Vibration Issues - apardal - 09-06-2007, 09:54 PM

[] - apardal - 09-06-2007, 09:55 PM

Shake, rattle and roll :-| - jondee86 - 09-07-2007, 08:03 AM

[] - apardal - 09-07-2007, 11:42 AM

[] - apardal - 09-07-2007, 11:45 AM

[] - dikolotour - 09-07-2007, 12:05 PM

Ghosts in the gearbox... - jondee86 - 09-07-2007, 02:12 PM

[] - apardal - 09-07-2007, 03:15 PM

[] - Jezza_hr - 09-07-2007, 05:12 PM

[] - apardal - 09-07-2007, 06:28 PM

First, define the problem.... - jondee86 - 09-08-2007, 12:44 AM

What did you change ?? - jondee86 - 09-08-2007, 01:26 AM

[] - apardal - 09-08-2007, 02:11 AM

Fuel saving... - jondee86 - 09-09-2007 02:45 AM

[] - apardal - 09-09-2007, 02:21 PM

[] - jondee86 - 09-13-2007, 11:51 AM

[] - apardal - 09-13-2007, 11:07 PM

[] - Rasteirinho - 09-14-2007, 01:10 AM

Launch control.... - jondee86 - 09-14-2007, 03:12 AM

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