My New Engine

[harolto]

Gday.

i havnt posted here much at all

but i just got my R31 goin with a silvertop RB20DET in it,

my car is a white S3 R31 skyline, with no side strips and missing rear garnish, so if you see me give me a wave

i have a few Qs, my car doesnt have a full exhaust (finishes at the frount of the cat) and my car idles alittle low, and if i give it a rev and back off it nearly stalls, the picks up a little, any way i can fix this? or is it doin it due to lack of exhaust?

also whats standard boost on a RB20? mine boosts at about 10psi was just wondering if this was normal?

cheers for any help

-Jake

[PHaT MR30]

AFM dirty? Idle Control Valve not working right? do you have an atmo bov?

think std boost is about 7 psi but with no zorst i would expect it to rise

[harolto]

yeah i have an atmo Bov, maby this is the problem? i will pack some washers into it and see if its better

then check AFM, and idle controller

also phat MR30 are you interested in buying a R30 skyline sedan? i have one here that i need to get rid of, it only good for parts or a bushbasher, cant be registered with out alot of hassle, only runs on 5cyl, body is pretty good for a car of its age, has been resprayed blue (from green) and has started to fade, its 100% origional, just missing sterio knobs, spare tyre, jack and horn button, also has smashed windscreen and rear 1/4 window, im askin $150 for it if your keen?

cheers

-Jake

[PHaT MR30]

haha nah i got rid of mine in january :'(

got the silvia now

[floody]

My redtop RB20DET did something that seems similar, dies if you are hard on the throttle then snap off the throttle and onto the clutch....Never figured out what it was. search around on here, there is a thread about something similar, people were talking about a dirty earth from the ecu or some such thing causing it.

[harolto]

cheers for the help

ended up being the BOV was too loose, tightened it, and now its all good

-Jake

[harolto]

just took it for another ride, and the problem is back so im gonna put the standard plumb back BOV on and see if it gets better, if it doesnt i will look at an earthing problem, or vacume leak

cheers for the help guys

-Jake

[PHaT MR30]

another thing was my mates R31 gts-x had problems with the TPS causing the idle to drop and sometimes stall

[grandmasterb]

just took it for another ride, and the problem is back so im gonna put the standard plumb back BOV on and see if it gets better, if it doesnt i will look at an earthing problem, or vacume leak

cheers for the help guys

-Jake

<{POST_SNAPBACK}>

Change back to your stock BOV or get a plumb back option with an aftermarket one and your problem will dissappear.

TimmyB had a similar problem with his Rb20 when he took the return pipe off his stock BOV with the rough idle as it upsets the A/F ratios with the stock AFM.

Generally if its a earthing problem (ECU especially) then it will cause other problems as well and most of the time when its happened to cars i know they wont start or run let alone drive just with a miss.

Hope ya sort it out soon

Cheers B

[floody]

In my car the problem was lessened a lot by cleaning the CAS plug up...But never totally disappeared. I do suspect TPS, I probably will never know as the current motor is unlikely to every be used again.

[sam.murray]

justin might buy that r30!

[harolto]

Sam, its still for sale $150, but cant realy be Rego'd only good for bush basher or spare parts.

cheers for the replys guys, i installed an aftermarket temp gauge the other day, and now its leaking water from where i installed it, so more work for me on sunday

cheers

-Jake

[da_snuff]

ive got that same idle problem... just stalls randomly sometimes! ive got a hybrid blow off valve (atmo and plum back) but didnt think that would do it when just at an idle as the bov doesnt doesnt vent to atmosphere till bout 6 psi... its all way over my head lol