ZW99GT

I've been having trouble the last couple days with the car JUST after I start it. If the car has been started in the past say....2 hours, it does fine. It's usually only when left overnight.

My wideband sensor says everything's fine at idle. I can back up, go slow where ever I need to go. When I get out on the road and get going, my wideband GOES CRAZY LEAN! and the car starts bucking/spitting/sputtering/missing/bogging down....etc......... If I clutch it, it goes back to idle perfect. So I would try it again, same thing.

It scared the hell out of me the first time. Now, all I have to do is rev the **** out of it, and everything goes back to normal. 02 sensor readings are perfect, car drives perfect, etc. WHAT COULD IT BE? Injectors clogging momentarily? Dumping fuel at startup?

Donnie's GTS

ECU could be toast, my 97 tbird did the same thing til it warmed up for a long time, turned out to be a fried ece, but the CEL was on forever though.

adam_ferguson

clean your IAC and EGR with STP throttle body and intake cleaner.

Cwilli01

Bump.
Exact same problem with my car. Took it to a mechanic and was told it was running lean "because it wasn't warming up fast enough" he replaced the thermostat and added new coolant. Problem started again the very next day. My check engine light is on though. It's giving an (air fuel metering code)

ZW99GT

Any other ideas?

2002GTAUTOVERT

if youre running lean, maybe throw a more restrictive air filter if you have a K&N or something until you can fix the problem??

SeanMalone

I got a question for anyone, when you drive by a wall or something that throws off sound and your windows are down, when you give it gas it almost sounds like some kind of sputtering coming from the engine. I was thinkin it was just the oil filter (is dirty)or something but i dont know to much? anybody.

Brute03

ZW, i'm thinking it's a fuel related problem. is there anyway for you to check the fuel pressure while it's acting up?

Rusmisel01GT

I also would check your fuel system... it could be injectors, fuel filter, fuel pump... your car makes alot of power and your fuel stuff may be maxed and and giving out.... just a thought.

99gtstang

my car acted the same last year... i don't know what all my readings were, but it ended up being a coil pack. No CEL light