Means fuel trim lean. Not enough fuel reaching the engine. Check fuel supply from fuel pump, fuel filter(maybe clogged), if you take out fuel filter and too much dirt came out from it, then high possibility your injectors maybe clogged too. Get it cleaned. Check fuel pressure regulator that is at the end of the fuel rail. It should only open when pressure is about 3psi.Air leaks in the intake channel may also make the fuel 'lean'. Check all vacuum hoses that are connected to the intake manifold, including the one going to the brake servo. Throttle body should also be cleaned and checked. Last but not least, remove and clean the oxygen sensor.
Apr 05, 2014 |
2002 Proton 400