i hav a eec4 cossy wiv collins chip ran 300 bhp@ 17psi when the chip was fitted and relevant mods were carried out, just had head done and grpa fuel pump etc and the car is runnin dangerously lean....... absolute nitemare any suggestions gratefully taken on board!!??

 

are u running a induction kit...?

if so, could be dirt on the elements in the MAF - take off (disconnect) and clean with copious ammounts of solvent cleaner

 

How do you know its lean?

 

Dave Henshall, sorry such a late reply mate, had it on the rollers lots at interpro bristol a few times wel loads in fact and theyre stumped 2!!!!!

 

its bin on the rollers loads at interpro bristol they found the probs but they set it up 4 me bout 4 months ago with no probs!

 

HI.
Have you had fuel delivery check and fuel pressure check since pump fitted,
and what else beside's the chip was fitted,

Dave