Ok, does the engine light come on for few seconds when key is turned to possition? If not the bulb may be burnt out. And having codes pulled would help.
If does come on then would need to start looking for a vacuum leak. They can be a pain to find, it took me on a mini-van almost 4 hours to locate the small little hose, about an inch long, that was the cause.
Common leak paths include the throttle body gaskets, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft.
Friday, March 12th, 2010 AT 8:36 AM