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Impco LPG Problem 


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 Post subject: Impco LPG Problem
Posted: Mon Jul 24, 2006 8:13 pm 
Technical Contributor
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Posts: 691

Joined: 1st Jun 2005

Ride: EFII Sedan

Location: Brisbane
QLD, Australia

I have an impco LPG setup (dual fuel) on the EF, and I've always had an annoying problem with it, but tollerated it so far.

It has the Impco CDP-Oz controller which uses the EGO sensor for mixture, and it controls the mixture by pulsing a solenoid valve which applies a light vacuum to the balance line of the converter.

My problem is as follows: If I floor it suddenly I get a moment of silence as the engine almost dies, but then recovers about half a second later. If I set the converter up with the balance line vented to the airbox (no computer control), it won't do this.

I am assuming now that this is because at WOT, all vacuum disappears and the computer can't control it anymore for a brief moment. Hence the engine seems to die.

What I was thinking of doing was to make a vacuum reservoir, and a regulator to supply a "lighter" vacuum to the solenoid, but I was wondering if there is an aftermarket kit that can be bought instead (if this is a common problem). I searched a bit, and found that extra vacuum reservoirs are commonly installed on smaller engines when getting vacuum actuated cruise control fitted.

Does such a "fix" already exist, where can I buy it, or is there another work around, as I can't get anywhere near 400k's a tank without the computer :(



EF II Sedan
Ex Chaser, Dual Fuel (Impco LPG)
LSD High, 3.23, Black wheels, other shiny bits.

EB II Sedan <--- R.I.P. (Rest in pieces - gone to the wreckers for $50...... bargain!)

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