hey guys just thought i would post up on here some issues i am having with a rb20 i have in a cefiro..... will try to keep it short....
basically i am having some issues with how its running and its really screwing with my head..... it is basically just a drift car.... my fuel pump packed it in so put in a new one.... but have had major problems with it since!!!! it is a bastard to start.... it turns over and gets the feeling like it will start and then wont for ages then all of a sudden will fire up..... it will sit there and idle fine for ages!!!
i then went to back it out of the shed and thats wen this crap started.... it runs sweet at idle..... but bring the revs up and it farts and carries on and shit and cuts out.... but starts again easy enough..... thing is just free rev (ie not under load or driving) it will idle fine then cough and splutter till about 2600rpm then will run fine again and ya can rev it right up till limiter if u like....
so took it out of shed and then ya go to drive it and it coughs for a bit then once revs are up a bit it will drive around all fine... comes onto boost etc
to try get rid of the misfire and carrying on we put new plugs, in changed fuel filter, changed over the afm, checked all plugs and all sorts.... my thoughts are maybe a coil pack is fooked?? (we checked spark on all the spark plugs while they out of the motor by turning it over with the plugs connected and spark is strong) the thing is it idles fine and runs fine once it gets over its coughing issues... so surely if a coil pack is fooked it just would be missing the whole time yeah??
the afm we cleaned out put back on and it still did it.... so took off the afm from my other rb powered car that runs all sweet and made no difference so pretty much cancelled out afm??
its definitely gettin fuel.... took off the line and fuel is flowing out wen ya turn it on..... thought maybe a clogged injector?? didnt check that because a mission to get down to them but all cylinders are gettin wet (fairly easy to see wen ya take the plugs out etc... dunno if this is a definite yes or no injectors are fine)
so this is where we have got to and now stuck.... checked fuel, checked spark, checked afm.... i'm lost..... fuel and spark is basically wat makes a motor run haha and it does run but very roughly for a part of its low down rev range
i have thought maybe a vacuum line cracked?? or a cooler pipe somewhere?? but i had a quick look (by this time i was very over it and didnt want anything to do with it hahaha) nothing seems out of place....
it drove fine and had its last track day got it off the trailer back at home and the fuel pump started packing it in.... then died (it started running real rough and carrying on and the pump was up and down and making bad noises then it just wouldnt start at all, pump wouldnt even prime itself... pretty much a give away the pump is dead to me haha).... then have had these issues since the new pump has gone in.... surely in my theory that the new pump in it should have fired up and ran fine.... but no....
any help?? anything i mite have missed?? anything to look for?? any help would be awesome!!! its not like a crazy modified motor... faily stock aside from cooler and an exhaust..... i dont get how it can be fine pre pump propblems and then fooked and running like a pig now it has a new pump....
cheers
dave