RB20 runs like crap need help ECU code 42

[tom2492]

I just got my 240 with the RB20det conversion. I didn't get a chance to drive it before trailering it home, long story.

I got it home and went for a drive.It sputtered, bucked, and is super rich, it generally ran like crap up to 5k rpm. A quick step on clutch to get the r's up and the car took off, shift and car fall on it's face and sputters until r's get up. Stock RB20det w/ cold air, bov and no cat 3" exhaust. I was told to check ECU and got a code 42???? and I can't find a reference anywhere. The motro is getting worse and barely idles now it won't rev clean at all, just alot of sputtering and black soot out of the exhaust, very rich??

I tried cleaning the MAF with carb cleaner today, cleaned the plug and applied dielectric grease. But there is no change in performance The O2 sensor was replaced before I picked it up so I'm thinking either the MAF or the fuel regulator is bad?

I was looking to buy a MAF on Ebay and there are a couple of them that say they are for a RB20-RB25 but the are N60 MAF's mine has the same part number but is a J60 MAF? Are they interchangeable???

THANKS in advance for ANY help,Tom

[rb240det]

Did it have trouble boosting? I know I had some similiar symptoms due to some bad boost leak. Can't help with the code 42...don't recall ever having that particular one.

[tom2492]

No problem boosting when the rpm's got up and the car finally cleaned up.But now it won't even idle smooth. I'm going to put new plugs in it, clean the coil packs, and reset the ecu. But I think the MAF is bad??? That's why I was trying to find out if the n60 and j60 MAF's were compatible.

Thank's for trying though...

[Carl H]

there is no code 42, the only possiblites are code 41 which is air intake temp sensor (which the rb20 doesnt have) and code 43 throttle position sensor.im guessing its code 43..... check tps.