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RB20T Problems

Luke

By Luke,
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Luke Newbie

Luke

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Engine Problem – Holden VL with RB20T – R31

Car was running fine. Parked for couple of hours. Next, hard to start, injectors noisy & closing, won’t rev over 1500rpm, won’t idle.

Changed o2 sensor, ECU, Crank Angle sensor, Air Flow, Checked Timing Belt/marks OK, BOV, Air Hoses/Tubes, What the F*** is wrong with my car?????

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Luke Newbie

Luke

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I hooked up an injector cleaning machine & its graphs show Injector pressure is high & flow rate is good. I also used a snapon vantage scope & it shows Injector pulses are eratic. I will double check all the wiring tomorrow. Thanks

did you do the wiring yourself?

id make sure that the wiring is all connected good...

maybe fuel filter.. but i doubt it as you said it was running fine...

in mine it would rev over like 3000rpm when i did the conversion... change fuel filter and off she went.

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Luke Newbie

Luke

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Is AFM air flow meter? This has checked out ok. All sensors have good connections. Injectors have 2.4 ohms on each. All have same voltage.I hooked up an injector cleaning machine & its graphs show Injector pressure is high & flow rate is good. I also used a snapon vantage scope & it shows Injector pulses are eratic. I will double check all the wiring tomorrow. Thanks

Double-check that your AFM is connected...
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blind_elk Grand Master

blind_elk

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Not sure, car is in workshop up the road. The motor has red rocker cover with large plenum - 2nd motor type in series, if that helps. I will check plenum tomorrow & let you know.
That sounds like the NICS engine. They have 2 inlet runners for varaible inlet runners. One runner is controlled by a butterfly setup, and they have a tendency to jam, but usually in the "long" position, so the engine runs like a dog down low, but generally runs OK up high (presumably if you can get there).

Get your mechanic to chek that the butterflies in the runners are operating OK.

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