Help On Rb20 Problems

[sly32]

hey,

so me and a few mates have just done a rb20det conversion into my mates laurel, we have wired it all up and everything, we saw the engine running and stuff before we pulled it out of the car,

so we started the car on the weekend, and found out that 2 of the bov's are leaking, so we changed it to a bov which wasnt leaking, when we hold the revs at 2000rpm the car sounds pretty fine, soon as we let the revs drop its really lump and stuff, we also cant hold it the accelerator down as it wont want to rev it will be very stuttered, we only have the dump pipe on the car atm, (dont know what sensor it is further downt he exhaust but that isnt plugged in,) we have changed the spark plugs, we are running split fire coil packs, so im just wondering what it could be? maybe fuel pressure or something? anyways any help would be good thanks, theres a video below of it and you can see dave try and rev it, then when my bro turns the camera to the baby listen to how lumpy the car is,

http://www.youtube.com/watch?v=rET89j8d9Nc

thanks JV

Edited June 4, 2008 by sly32

[QWK32]

the sensor further down the exhuast is just the cat temp sensor and not needed. Have you gone over all the intercooler pipework and vacuum lines for leaks? and the car will still run ok will just a dump pipe.

[sly32]

the sensor further down the exhuast is just the cat temp sensor and not needed. Have you gone over all the intercooler pipework and vacuum lines for leaks? and the car will still run ok will just a dump pipe.

yeah we have gone over lots of stuff, but i dont know why when we hold the revs at 2g its fine and then at idle its very lumpy it doesnt make sense specially if it was a loose cooler pipe, it doesnt smoke much at all out the dump pipe, but i have smelt a lil bit of fuel so its obviously not burning all the fuel, but yeah im a bit stuck to what it could be, i might try and swap o2 sensor but im not sure how mucht hat will help i dont think it would b that, maybe igniter i should try and change?

JV

[QWK32]

nah the O2 sensor wont do much. its hard to tell on your video because you don't have a full exhaust yet but it sounds like it might be missing a little bit. have you checked each coil is firing?

[sly32]

nah the O2 sensor wont do much. its hard to tell on your video because you don't have a full exhaust yet but it sounds like it might be missing a little bit. have you checked each coil is firing?

yeah it does sound like its missing, but we only just pulled the coils off another car and they were all working fine, so yeah not to sure, maybe i should try the igniter? we have a few spare igniters, how do u check that each coil is firing?

[QWK32]

pull a coil out, put a spark plug in the coil, make sure the bottom threded part of the spark plug is touching/grounded out on the engine and give the engine a crank. you may want to unplug the injectors at the main injector plug so you dont waste fuel or put unwanted fuel in the cylinder.

also check what the main voltage is? to low and you wont be getting a strong spark. and it wouldn't hurt trying a different ignitor, it'll help you rule something off the list.