Rb25det Runs Like Sh!t When Hot

[mr-r33]

hi guys after runing the RB25 for 30mins it start to run like shit stops at the lights and holds back yet it sounds like it is still make boost ( or timeing drops out)

and when you rev it. it sometime stalls

Edited August 9, 2010 by mr-r33

[jarrod83]

more info? lack of power may be rich and retard or an air leak.. air leak may explain why its running like shit and stalling.. car runs rich when cold partly countering the fact its getting more air under vacuum.. when it warms up its still getting more air but less fuel and stalls.. just a stab in the dark with the limited info u gave

Jarrod

[mr-r33]

more info? lack of power may be rich and retard or an air leak.. air leak may explain why its running like shit and stalling.. car runs rich when cold partly countering the fact its getting more air under vacuum.. when it warms up its still getting more air but less fuel and stalls.. just a stab in the dark with the limited info u gave

Jarrod

can only give what i know has power cold and warm some times when warm and you put your foot down it will take off then all of a sudden its like pulling a freight train

and 2 as i dont have RPMs yet it is like it idles as normal then drops to all most still then gose back up and dose it agen some times it will stall out and some times it wont if you hold the revs up say 1000-1500RPM it will still do it

[HEKT1K]

vacuum leak i reckon. happened to me a while back... i had a split in my factory boost gauge line, which connects near the AAC valve so it became more of a problem when the car was warm

[mr-r33]

ok on my home from work i disconnceted the temp switch ( the one that gose to the ECU) as the prob is only there when hot so i thought lats tell the ECU that the engine is cold...anyway it didnt work

[blind_elk]

Have you checked all the intercooler pipework?

[mr-r33]

Have you checked all the intercooler pipework?

all good no leaks

[jarrod83]

what did you disconnect? the connection that goes to the temperature sensor? your theory has a few holes in it.. as your assuming that with the sensor disconnected, the car would think it was cold? the car may just run the car like its hot without the sensor, plus there is two temperature sensors.

Its more than likely an air leak, ive seen this before a few times with friends cars that swear they have no air leaks and have checked it with air compressors etc..and months later we end up finding a air leak in some remote location, like at the carbon canister, once one of the runners had a crack in it at the bottom, couldnt even get your hand down there to see etc..

If its not a air leak theres a small chance it may be a dying fuel pump or an electrical issue, but more often than not its an air leak =/

Jarrod

[mr-r33]

what did you disconnect? the connection that goes to the temperature sensor? your theory has a few holes in it.. as your assuming that with the sensor disconnected, the car would think it was cold? the car may just run the car like its hot without the sensor, plus there is two temperature sensors.

Its more than likely an air leak, ive seen this before a few times with friends cars that swear they have no air leaks and have checked it with air compressors etc..and months later we end up finding a air leak in some remote location, like at the carbon canister, once one of the runners had a crack in it at the bottom, couldnt even get your hand down there to see etc..

If its not a air leak theres a small chance it may be a dying fuel pump or an electrical issue, but more often than not its an air leak =/

Jarrod

fuel pump is brand new (a R31 intank one) i was told it will be enough??? in the next 3 mounths or so i'll be getting a 040 pump

when i wiried in the engine i solded all the joints

there is a earth on the alt that is held on with a 8mm can that make any difference if it in not on???

can i spray WD40 over all air hose to fined a air leak?

[Moodles2]

When RB's run like shit when hot, it's usually either the ignitor module is on it's way out, or it has a bad/dirty ground

[mr-r33]

When RB's run like shit when hot, it's usually either the ignitor module is on it's way out, or it has a bad/dirty ground

S2 engine

and will look at the grounds

[mr-r33]

do my plugs look ok

sorry about the pics took them from my phone

[mr-r33]

oh for got to say the best way to discribe mr prob is

if your driving and have your foot down it cuts out like you have just turned the inginition off and come back on when you lift your foot

[mr-r33]

ok guys i fix the problem....was the AFM....and the stalling was the air by pass vale on the mainifold

[jarrod83]

nice work, did u solder the afm or swap it out for a new one?

[mr-r33]

nice work, did u solder the afm or swap it out for a new one?

just swap it out for a new one