Start Up Issues

[chalky]

ive got an r32 rb20 and every now and then when i start it up it revs up a bit like it usually does but then it dies down nearly to a stall then revs itself back up again, does this several times until i give it a rev myself or hold it at 1000-200rpm for a few seconds?? whilst its revving itself the oil pressure light is on an oil pressure doesnt rise until i hold the revs!

any ideas?? ive thought that my oil pressure pump maybe on its way out?

[NZM.031]

i wouldnt start jumping to oil pump conclusions just yet... it wont stop the engine running... well not yet.. id be looking more at the top end.. sensors, injectors, connectors, etc.

AFM is a good place to start as its really common to fail and cause dramas.

clean all your electrical connectors with carby cleaner, and clean your throttle body aswell.. may be gummed up in there. remove one of your vacuum lines at each end of the manifold and spray a bit of carby cleaner in there.. when you see what it does to your throttle body you'll see why.

put some injector cleaner in the fuel tank next time you get fuel.. and heres a good tip... get another bottle of injector cleaner.. warm the car up.. remove a vacuum line (make sure its vacuum) and slowly and gently put the end of the vacuum line into the bottle of injector cleaner.. this sucks injector cleaner through the manifold, over the valves, through the chamber, and out the exhaust... it gives everything a bit of a clean out... it will blow lots of white smoke and misfire a little bit but thats normal.. so dont do it in your garage. you'll have to rev it up so it doesnt die, so you may need some help.. you only want the vacuum line to sit above the cleaner... so it can only suck a little bit.

it could also be an air leak... go over your vacuum lines, intercooler lines, etc... check them all.. you can also use carby cleaner test to check manifolds... just spray carby cleaner around the manifold joins, if the car dies down a bit, then its sucked the cleaner in through the gap...

most likely though will be the air flow meter.

[payback21]

Ive got a very simlure problem with my wifes car. Things i have tried and changed.

Fuel pump, AFM, coilpacks, plugs, ignitor, ecu, checked vacum lines,

Still scratching my head to know what it is. It has to be a sensor somewere. If i find, i will let you know.

[NZM.031]

Ive got a very simlure problem with my wifes car. Things i have tried and changed.

Fuel pump, AFM, coilpacks, plugs, ignitor, ecu, checked vacum lines,

Still scratching my head to know what it is. It has to be a sensor somewere. If i find, i will let you know.

it will be something silly and simple.. i once completly missed a massive cut on the inside of an intercooler hose where it goes through the body.. check all the clamps, vacuum lines, everything.. didnt find it till i removed the whole intercooler.

[chalky]

ok. well in my case this problem arised b4 i install fmic, bov, pretty much has done it since i got it

[blind_elk]

According to my workshop manual, unstable idle @ cold start can be caused by:

Engine temp sensor - check its resistance value, output voltage

AAC valve - valve should be closed. Check if idle adjustment is set correctly.

A/F ratio too rich/lean. Try starting with vac to FPR disconnected.

Ignition timing incorrect.

Poor condition of spark plugs.

(payback - wtf is "simlure"? I think the word you want is "similar". kids!!!!pfffft!)

[payback21]

(payback - wtf is "simlure"? I think the word you want is "similar". kids!!!!pfffft!)

Test your perfect skills and google DILLIGAF!

[AlexanderWilde]

Check your Throttle Body i had unstable idle @ cold start and cleaning it resolved the issue you can find a how to on G35driver or you tube here is a link http://www.youtube.com/watch?v=KwdYzWzc170

make sure if you don't want or don't know how to do the relearn procedure then you don't unplug it just clean it while the electrical cable is still connected

i recommend you read this thread: http://g35driver.com/forums/engine-drivetr...y-cleaning.html