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WierdblueR32

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Posts posted by WierdblueR32

    Rb20de"t" running lean

    in RB Series - R31, R32, R33, R34 (1986-2002)

    Posted · Edited by WierdblueR32

    Hey, figured id pop back in on this. I did wind up getting the car running right again with no breakups at high rpm, poured in some fuel injector cleaner/octane booster with 5 gallons of fresh high octane gas, problem gone after it ran for about 30 minutes revving here and there. Drove it around an out about 20 miles on it in the days after with pulls up to like 6800 rpm I wanna say, didn't go too harsh on it but did get to full boost a few times, and plugs were no longer super white like they were, and now look perfectly fine. I did also double check gap on all plugs, checked vacuum lines, checked fuel pump pressure, voltage, timing, everything was good. Hard to believe just stuffy injectors can throw you through a loop, but when you start doing dumb things as I did, it wastes your time. Thanks for help and slapping me on the right track, appreciate it!

    Rb20de"t" running lean

    in RB Series - R31, R32, R33, R34 (1986-2002)

    Posted

    6 hours ago, WierdblueR32 said:

    That what I am thinking too!!! Will double check this because I don't think someone does a timing belt on a car that runs lean.

    Ok so car ran good a few weeks before I bought it. (After belt was changed) it developed a misfire and he replaced coil packs to no avail, and that's when I bought it (knowing it had a misfire) So I was troubleshooting the fuel system today and unplugged vacuum from fpr to fuel rail and see if it would increase pressure and make it run rich while also checking vacuum. It has good vacuum at idle, but the car still runs lean. Now I'm targeting fuel pump issues whether its voltage or pump weak.

    Rb20de"t" running lean

    in RB Series - R31, R32, R33, R34 (1986-2002)

    Posted

    42 minutes ago, ossy said:

    Timing is possibly out? 

    I've got a R33 that was doing the exact same thing and I couldn't figure it out for a looong time. Some times power was great and other times it drove like crap. Took it too some Skyline specialists and turns timing was out badly and the fuel pump was leaking  back into the fuel tank so wasn't getting enough fuel either.

    Mine had a new timing belt done by the previous owner as well but didn't do it properly :/

    That what I am thinking too!!! Will double check this because I don't think someone does a timing belt on a car that runs lean.

    Rb20de"t" running lean

    in RB Series - R31, R32, R33, R34 (1986-2002)

    Posted · Edited by WierdblueR32

    6 hours ago, KiwiRS4T said:

     When you say you got a new MAF is it a brand new genuine item and the right one for the application? Have a look at the plug wiring - sometimes resoldering the connections will help. The unknowns are - do you have a suitable ECU and are the injectors right for the application? Did you get receipts for the fuel pump? Is it brand new or used? Can you get the use of a fuel pressure tester?.

    MAF is genuine nissan. Connections look good but will do further inspection of them. Will ask previous owner about this.ill try to get ahold of him, but if the fuel pressure was low then why would it run fine in limp mode?

    Rb20de"t" running lean

    in RB Series - R31, R32, R33, R34 (1986-2002)

    Posted

    Yes I know there's a few forums but none have been able to lead me to a fix for my 89 r32 gts-"t"

    The reason I use quotes around the t is because this car is a factory 1989 skyline gts rb20de 5 speed. I've just bought the car and the previous owner had told me fuel pump has just been done. Car is turbocharged with rb20det parts using det intake, turbo, manifold, and probably various other things to swap to det (also has large front mount intercooler). I do know that the timing belt has just been changed right before I got it, and has new coil packs on it. I've put about 120 miles on the car and pulled the plugs and the car is running very lean. It's noticeable with a rough idle and breaking up at high rpm under boost. Changed fuel filter thinking that was it but did nothing though it was dirty. Changed MAF as well because it was filthy, cleaned it, still ran bad, so I bought a new one to no avail. Ive sprayed starting fluid all around the intake and hoses and I am unable to trace a leak anywhere. So I am stuck at the moment and starting to lean towards a dodgy fuel pump or stuffy

    injectors, but it runs great with MAF unplugged, although I'm only able to rev it to what is it like 3 thousand in limp mode. Also with it unplugged it idles at like 1200 rpm. Idk just want some more feedback from people who know these cars better than I do. 
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