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Rb20det Running Badly

GTAHH

By GTAHH,
in General Maintenance

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GTAHH

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G'day, I have recently swapped the engine (to another silvertop RB20) in my 32 GTST. I changed all the sensors (except knocks) from my old engine to the new, to avoid troubles like this. Now the old engine cracked a piston and was blowing obviously alot of smoke.

The car is running, and was running perfectly besides a few idle probs, but recnetly the car is running so rich that it will foul up the plugs and leave a pile of soot behind it. I have tested everything besides the AFM and O2, and can't connect consult, is there any way to test them without the car running? I checked for vaccum leaks etc to no avail.

When I disconnect the MAP (MAF?) sensor on the firewall the car runs much better and blows no black smoke, so I swapped it with a working sensor and it doesn't make any difference it still runs terrible. When I disconnect the hose running to the idle valve it runs perfectly and blows no smoke, so this makes me think there might be a leak or something? I've also tested using two different idle/aac valves. I'm unable to take the car anywhere either as it is struggling to run :)

Thanks in advance,

Cheers

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GTAHH Collaborator

GTAHH

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Yeah, when I disconnected the hose I plugged it up and it would run the same. With it not plugged up it would run better and not blow as much smoke. It only seems to blow the smoke at idle and when revving down it belches out a bit.

The belt was changed when the new motor went it, but no haven't checked timing

Anyone know if the ECU even reads the O2 sesnor at idle?

Cheers

46n2 Mentor

46n2

Posted
Posted

O2 sensors only work once they have warmed up. AFAIK the ECU's always using the readings from the O2 sensor. you said that you couldn't hook up consult? is that because you don't have a dongle? or by some freakish instance don't you have a port in your fusebox? consult should give you the answers to your problems.

Cheers...

GTAHH Collaborator

GTAHH

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Yeah I have a cable I made up, which works for the previous to pulsars i've owned, but it will not connect with the ECU in the skyline, and that's trying with 2 different ECU's. One from my car and one from a '92 model. I've checked that the diagnostics connector is actually connected to the ECU pins which it is but still no luck with the consult.

So even if it runs extremely rich on cold start, that would mean that it can't be the o2 sensor? This ones got me stumped :rofl:

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