radness 0 Posted November 13, 2008 Hi guys, Basically my fuel economy seems to be getting poorer and poorer as the day goes on. The only mod i have is the Kr cam. Before and after the cam was put in i had a back fire if i accelerate hard in first then change into 2nd gear, it seems to only happen in either 1 or sometimes 2nd gear and only with high revs. It gives a loud pop / backfire. Is this damaging anything? Is it a sign i'm running rich? Power wise i seem good in the low revs till about 5500 (after that i dont notice any significant pull), so i don't suspect running lean fueling. Also worth mentioning that i always run on super unleaded....it's only 3 p difference over regular fuel...and i think it's a good idea.instead of paying 10p more for bp ultimate or the like. I read on this forum there is a way to adjust fueling with an allen key but it doesn't describe where you do this.... I'm nervous about running lean as i hear this is more dangerous for your car than running rich? correct? One last thing, my fuel pump seems very noisy, i don't know if this is normal for an old car, but i can hear the sound of itwere on other more modern cars i only ever hear the pump getting pressurized, is this a sign that it's about to die or that my fuel filter needs replaced? (don't know when either has been done - car is at 120k). Hope you guys can help me out :) Quote Share this post Link to post Share on other sites
mattkh 0 Posted November 13, 2008 Hi Change the fuel filter. Then if the pump is still noisy, then change the fuel pump. Quote Share this post Link to post Share on other sites