We know that if air gets into the system this can cause ICV% to become erratic, but I have not had air in the system for many years since I became aware of the issue, we also know that fitting a lift pump will raise ICV% by around 4-5%, but fitting a higher pressure pump does not increase ICV% further, I fitted a Carter 4600 lift pump years ago that produced 4psi at idle, 2.5psi cruising 100k and would drop to negative territory on hard acceleration, I replaced the 4600 with a 4601 earlier this year with no further change to ICV% but I have 12psi at idle, 10psi at 100k cruise and 8.5psi under hard acceleration. The worrying thing is that Australia is a very big country like the US and we can be hundreds of miles from anywhere if a problem occurs so reliability is paramount when traveling our backblocks, knowledge is power. The performance of the truck has not changed one little bit. When I first hooked it up ICV% was low 50's% at idle and high 40's% cruising at 100k (60mph) on flat road, since then ICV% has had a few drops and resurgences but on a recent trip it dropped to 22% 100k. The ECU gives a readout of ICV% (Injector Control Valve%) and I'm having great difficulty getting an explanation as to exactly what this is and how it effects the pump and performance, to take a step back, I've had my truck 16 years and around 6 years ago I fitted a device called an ECUTalk that gives a display on various things going on in the engine, it is wired directly to the ECU. įor some time I have been researching an elusive point on the Bosch VP44 as fitted to my 2000 3L 4cyl Nissan Patrol here in Australia, without full success.
Hi Guy's, hope this is in the right section.
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