rb20det sputterin! JUNK!

[redrockets13]

ok so my frint clip i bought is amazing turns out im runnin 11.5psi the dude that owned it before me from japan is a psyco i guess. hes awesome. lol alright so after about two or three weeks into raising hell my car started falling on its face. it was rare but when i drove it more and more it became worse.

sometimes when i start off rpms get up to about 2200-2500 then it falls on its face like a fuel cutt or somethin. sometimes it will do it at a higher rpm like 4000-5000.low idle, high idle, then sometimes it will fluctuate 1000-2200. goin up and down. please help me so i can go lay wheels and get sideways without any problems. lol thanks alot sorry if im not understandable. just ask anything youd like ill do my best to describe.

[Yellow4g63]

lets start with how was the motor when you got it? Lots of miles? did it look like it was driven to hell and back and wasn't taken care off? Is there a check engine light what code dose it pull up?

[JDMEnthused]

sounds like something having to do with fuel, perhaps.. check your fuel filter, sometimes.. there is grime that gets caught in your fuel filter, ive witnessed this a few times and that helped it if not down right, fixed it

good luck.

[klh6686]

What fuel pump are you using? check to make sure it is working. Also, the 2500 rpm rev limit sounds like something MAF related. Also you might want to check for any exhaust leaks from the head to manifold, as that may leak exhaust gas that the maf can get and cause it to mess up, as my car is currently doing. Hope you figure it out.

[redrockets13]

replaced fuel filter. still crapy. 61kmiles motor in great shape. got it from jarco. looks maintained well. no exhaust leaks at all. im using the stock skyline fuel pump. i bought a front clipmso i had everything and did the swap myself. didnt not do the wiring tho

also

i have the skyline gauge cluster in the car and everything works but no engine light is commin on. maybe no bulb. ill check

[Eikon]

try cleaning your MAF

[rbsileighty]

Did you ever see a black 92 SE running around Marietta back a couple of years ago? Not a huge town and just wondering who might have had my car before me since I bought mine there. They had autometer stickers on the inside and some residue from where an A-pillar pod use to be... nothing a 5 hour drive with no radio couldn't fix.

Anyway... first start off with what your setup is... exhaust, pod filter, fmic etc.

What gauges are you running? If you have fuel press, how does your pressure look when you are having problems? Have you pressure tested your induction system... might be a good idea since you could have some leaks.

[s13_rb25det]

check your intercooler piping!! and the hoses for any tiny cuts in them ..

[themadscientist]

ok so my frint clip i bought is amazing turns out im runnin 11.5psi the dude that owned it before me from japan is a psyco i guess.

That is stock boost for the RB20, no craziness. That assumes japanese high octane gas though so you be careful wit dat!

[Darius]

I am new to the RB scene here and am still working on getting my 25 ready to install, but my acura used to do that when the O2 sensor was faulty. It would idle up and down 650-1500rpm sporatically and bog really bad sometimes.

I dunno. I figured I'd throw that out there since no one else had.

[rbsileighty]

That is stock boost for the RB20, no craziness. That assumes japanese high octane gas though so you be careful wit dat!

I guess he can clarify, but I think that's the way it was... now it's falling out on him. Is this the case redrockets13?

[redrockets13]

okay so i cleaned my maf by getting an air hose and running it through it. then i reset the computer and its layin down second longer than it ever has. seems its makin more tourqe.it was running great all day then whenever i give it hell it seems to sputter for just a second. i think i need to get a better intake filter. so i was ganna see how it did again after that sputter so what i did got on a long straight that my house is off of and where all my buddies and i do burnouts on and i was power breakin it for like 30ft in 1st then shifted to 2nd left ungodley rubber goin back and forth. :] hell yeah but it sputtered for a second again.

what can i clean my maf with?i think i do need a better filter also.what do yall think?thanks for all yalls help

[redrockets13]

naw sorry man havent seen it around.

[Darius]

Correct me if I'm wrong, but your MAF would likely be fouled by oil and that could be cleaned off by brake cleaner or a degreaser.

[Shahee1]

I was gettin same type of performance fall off ... I replaced the MAF with a HKS VPC ... now I have not had the problem again ... also found a boost leak in my piping that was not helping my situation either. You might as well just go ahead and dump the MAF and start looking for a boost leak. Then get the car back up and FEEL THE BURN!!!! LOL

[driftjunke]

Could be the stock Skyline fuel pump going bad, not flowing enough at higher rpms when you go WOT. Get a Walbro and hard wire it, and get a aftermarket adj. FPR, sounding like fuel is and issue for you.

E

[redrockets13]

thanks man where did you get your maf? and how much?

[Shahee1]

I got my MAF from a friend of mine that bought this unit to rechip it for his sr20det. He lost interest in it and I bought it from him. Those units are generic. All you have to do is buy the chip and the harness and change the jumpers inside the unit to let the unit know if it is controlling a 4 or a 6. It runs much better ...

[mugengsr]

this problem is common with skylines its the maf .. like what was mentioned many times in this post .. open it up and re solder the contacts and it will be best kind .. its common for the rb20 maf to have the solder come loose after all those years

[Dramier]

Without meaning to jack the thread...

Talking about MAF's and such.. what is the correct specifications for output on the MAF.. as far as reference signal and such go.. In other words.. What is the standard test for the correct operation?

(And I'm not talking about the "disconnect it and see if it dies" type of test)