Boost Problems

[MR SLY]

hey just a quick question.. i've got a r33 GtsT.. when i'm driving it pulls boost it won't go, it feels like it's holding back... on the boost guage it saying i'm on boost.. but yeah it doesn't go it's like it's lagging.. BUT when i turn my car off then on again, it work's normal it pulls boost then goes good... it only happens sometimes though.. any ideas??? i've checked all hte piping and vaccum it's all good... but yeah does anyone have this sort of problems??

[Slide]

Edit :re-read post

Edited November 24, 2005 by Slide

[chaos]

slipping clutch will be constant, you dont just turn the car off and it will magically go away

[53XYN]

disconnect the battery .. for about 1 hour.. then reconnect see if its still there.. (this is just to reset the ECU) assuming ur running a factory unit.. if this fixes ur problem buy another computer if its manual i have a TIAL ecu to suit a manual series 1 GTST from my old car.. no speed cut no boost cut supports bigger inj as well let me know if interested..

[MR SLY]

i've got a blitz computer.... yeah it's weird when it happens, at the lights i turn the car off hten turn it back on then it drives normally... i don't have a clue.. checked everything.. jsut got a new clutch put in brass button clutch..

[MR SLY]

can i dissconneted it for more then an hour?? like take it out at night then connect it back in the morning

??

[Oz]

can i dissconneted it for more then an hour?? like take it out at night then connect it back in the morning

??

<{POST_SNAPBACK}>

a hour is plenty but u can leave off over night, does sound like a computer problem or a electronic part, may be a idea to have a inviro purge & a on car injection clean done, could be some thing as simple as dirty TPS & may just need to have a clean, worth a try...

[MR SLY]

i pulled all the plugs in the engine and cleaned it.. even took out the coil packs and cleaned them too...

[V8skylineMAN]

You left your handbrake on.

[The Dan]

I had the same problem when my MAF meter was starting to shit itself. But also did the same thing when my turbo was about to crap itself too.

[MR SLY]

turbo is fine... still pulling boost....

update.. theres' oil in the last cylinder... and spark plug was BLACK AS!! got new ones and cleaned the oil away... works BEAUTIFUL!!

5 days later... it happened again.. so i checked if there was oil in the cylinder again.. there's none so i cleaned the ends of the spark plugs. now it works good again..!! what the!! again when it did happen, i turn my car off then on again.. it worked normal again..

can't figure it out

[smurf80]

You can drain the power by disconnecting the battery and putting your foot on the brake. You dont need to leave it to for an hour..... The computer will reset once the power is drained. takes a couple of minutes or so.

[MR SLY]

still doing it!! don't know what it is...

[nathmacca]

i have a similar problem with my gtir, what it is with mine, is my afm on its way out, and if for instance i take off at the lights and load it up, it sends the computer into a failsafe mode, limiting boost to 7psi, and making it run rich as, im unsure if skylines have the same thing in there computers.

[madbung]

One oily plug

How'd that oil get there? that's the question..

Was the plug oily or just real sooty from running rich?

If it was oily I'd be doing a compression test straight away, also I'd be driving it gently until you find the problem just in case it's a mechanical prob and not ecu or tune related ie: cracked or sticking ring or a problem with your valves.

If it's sooty from running rich and all other cylinders are fine check that injector then valves.

One oily plug is pretty scary imho.

Keep checking that plug see if it oils up again

Goodluck.

[MR SLY]

after i clean the oil... it hasn't came back.. yeahi don't know where the oil came from....

so you htink i should change my afm???

[MR SLY]

but everytime i undo and check the spark plug.. i works good for about 5 days ish.. then i happends again.. i've just changed hte spark plugs... there's no oil in the cylinder..

nathmacca.. it does hit 7 psi...... i think i might change it.. thanks man.. but if anyone has other solution please let me know

[MR SLY]

how you know if it's on it's way out?? or even broken?? i don't want to buy a new one if it's going to do the same thing