problems with EFI car idle and pressure sensors

[Bernd Felsche]

Tony Bryant tapped away at the keyboard with:

> TPS & RPM systems are TOUCHY. The trouble is that at low RPM, the
> slightest hint of a throttle opening needs to cause a big change
> in injector pulse length.

> Ditch the TPS, and run a MAP sensor instead. Grab a MAP sensor
> from a 80's 4AGE toyota corolla, three wires: 5V, Gnd, and output
> (0-5V -  4V ~=~ 101.3 KPa).

Bosch D-Jet used a MAP sensor. (Most) later Bosch systems used some
sort of airflow sensor, either volume of mass. The exception is
Mono-Jet/Motronic which is a throttle-body injection system relying
on n-alpha until the (optional) lambda control kicks in.

> TPS/RPM is not for beginners. Or anyone who cares about idle.

TPS isn't really for anybody. :-)

n-alpha requires a great deal of knowledge about the engine; and any
changes to the engine (even wear and contamination) require re-mapping.
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