my car has started to have a bit of a missfire/rough idle.. only does it on petrol but runs sweet on lpg, replace the fuel filter and fuel pump recentlty tho. any1 got any ideas? also on petrol the pcv valve ticks super loud and also sounds like one injector is ticking a bit louder then the others. its a ef.

not sure what it is, but my old mans EL is doing to atm but reverse, runs fine on fuel but when on LPG it will not even get up the drive way feels like its running on 3 cyls.

if we find the problem ill let you know

Same here mine idles like it's on 4 cylinders and when i accelerate it gets 5 times worse!

Injectors........

mine use to be that bad untill i replaced the fuel filter and fuel pump, went back to running perfect.. now its like it will be ideling smooth and have a little hickup ever say 3 seconds or so.. any ideas guys?

the fuel lines could be gummed up might pay to run a tank of premium with an added injecter cleaner and then see if that helps

cheers, bear

What about a disconnected vacuum hose?

Just done my injectors and resealed my inlet manifold which was worth the effort, $20 inlet garket and about $20 bucks to get each injector cleaned and the power gains are great but as vic said check vacuum leaks. My ef xr6 is dual fuel too idles great on gas but a little rough on petrol, the computers have a tendancy to over fuel on idle causing them to run like a b**ch at times . Maybe unplug the O2 sensor when its running rough and see if it makes a difference. Also unplug the ISC on top of the throttle body they can tend to play up. I replaced mine done nothing so i wouldnt bother wasting your money mine is unplugged all the time and idles better off than on but it may stall once or twice when on cold start up so give it a little rev, very little rev on start up so u dont break nothing whith minimal oil pressure. Try those things 1st then you can start checking TPS and other things afterwards. Easy stuff 1st. hope that helps.

Could try reset your base idle... Most of the guys using J3 chips are using TPS voltage readings of 0.7v at idle as a measure which equates too about 600rpm base idle rpm without a 0.75mm feeler gauge between the throttle tab and stop plate.


cheers