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Rb20 Timing

sky_2.0T

By sky_2.0T,
in Engines & Forced Induction

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sky_2.0T Enthusiast

sky_2.0T

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does anyone have a picture of the stock cas timing position for the rb20det silvertop? Also what would cause it to run rich? I ran the diagnostics test and the single led light stayed on. Everything else checked out fine (55). Only mods are blitz intake, high flow exhaust/cat and i have alot of black carbon buildup on the tail pipe and the exhaust really smells. i get a headache just from the smell of it, please help thanks

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blind_elk Grand Master

blind_elk

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There is no "stock" position for the CAS. It is adjustable because every engine is slightly different.

These engines generally run rich by design - it is self-preservation. But it could be that the injectors are dirty and not shutting off properly, allowing excess fuel into the cylinder. As a start, have the injectors sonic-cleaned, then run injector cleaner (I find the Nulon product to be quite effective) on a regular basis.

You may also have a dead O2 sensor if the diagnostic is not showing "red-green" cycling.

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sky_2.0T Enthusiast

sky_2.0T

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There is no "stock" position for the CAS. It is adjustable because every engine is slightly different.

These engines generally run rich by design - it is self-preservation. But it could be that the injectors are dirty and not shutting off properly, allowing excess fuel into the cylinder. As a start, have the injectors sonic-cleaned, then run injector cleaner (I find the Nulon product to be quite effective) on a regular basis.

You may also have a dead O2 sensor if the diagnostic is not showing "red-green" cycling.

I have a single LED light on my ECU , i'll check the diagnostics. anyone know the o2 sensor parameters to test (ohms)

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blind_elk Grand Master

blind_elk

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Well then, it will probably be "on-off" cycle. The O2 sensor puts out a voltage on the centre (white?) wire, between 0 - 1 V. When the ECU is in "closed-loop", the output will vary within this range, but should generally average 0.5V . Note: "Closed-Loop" is constant throttle and constant load, NO BOOST, vacuum only.

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sky_2.0T Enthusiast

sky_2.0T

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Well then, it will probably be "on-off" cycle. The O2 sensor puts out a voltage on the centre (white?) wire, between 0 - 1 V. When the ECU is in "closed-loop", the output will vary within this range, but should generally average 0.5V . Note: "Closed-Loop" is constant throttle and constant load, NO BOOST, vacuum only.

alright i got some voltage out of the white wire! I'm going to the dyno tomorrow to see how its running. turns out the rear trunk compartments on each end of the car had vents that were sucking exhaust fumes into the car when the windows are down.

are the rear of the skylines sealed? I need a lower lip so the exhaust can't get sucked under...and a spoiler, and paint!

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