Toymods Car Club Inc: Tech & Conversions => unravell the 20V mystery.....cos i cant. (WTF is this shit??)

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irishtwincam
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Location:
Ireland
Registered:
May 2002

Re: unravell the 20V mystery.....cos i cant. (WTF is this shit??)

Mon, 01 August 2005 13:42

Quote:

# WTF is the stupid VSV just under the throttle bodies which appears to switch vacuum from throttle no.4 to the engine side of the throttles (where the ISCV air output goes)???
It goes to an ouput labelled "EVP" on this ecu here... but on all the wiring diagrams i've got and found its labelled IPV or similar... wtf does this POS do???

The vsv under the 4throttles is for idling up when cold.

On a 16v you have the mechanical water temp controlled iscv under the Throttle body. To add extra fuel during idle up thers a 5th injector.

Because the 20v has 4throttles it cant have a 5th injector.
So the ISCV sensor (i believe im right but admit I could be wrong) which i think is a variable resistor/potentiometer adjusts voltage to the vsv.
When cold, vsv gets lots of voltage, this causes it to allow vacuum to pull on the diaphragm connected to the TBs. This essentially pulls the throttle open to bring up idle rpms.

As the engine warms, the ISCV reduces voltage (cos its plugged into a water line in the block/head). this acuses the vsv to see less voltage which means it lets less vacuum past. Less vacuum means less pull on the ITBs which drops the engine idle rpm.

I could be wrong.

[Updated on: Mon, 01 August 2005 13:47]

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