Thread: check engine light goes on and off!!

i brought it to autozone and the scanner said bang 1 running lean so i put a new o2 senser in and did spark plugs and wires and it still comes on when it wants to so i brought it back to autozone after i did the parts and it still says the same think im going nuts please help its a 2000 gt thanks

You have a vacume leak somewhere.


Check all of your vacume lines to start with. If you still can't fins anything then it may be an intake gasket

Let us know.

ok i will check and let you know how it goes thanks

i have no vacum leaks what is the best way to check the intake if its leaking?

Carb cleaner while the engine is running. You have a vacume leak. It's just hard to find. It could be a slight crack in a hose that you can barley see. But you have one. Also check the evap silinoid. It's the one by the firewall with 2 cases and connectors running to it. Check it where the hoses connect to the silinoid. Sometimes the clips break and the hose looks like it is on there but it's not.


When you spray the carb cleaner on all of the hoses and you hear a raise in the idle you have your leak.

ok testing it in a little bit will let you know how it goes thanks again

i used the carb cleaner almost a hole can motor did not rev up at anytime

i cant find the one on the fire wall

im going nuts i cant figure it out!

Did you check all of the vacume line for cracking ect?

Do you have acces to a tuner or scanner. When I had mine the only way we could find it was be using carb cleaner. When you find it your STFT will go to zero for a second... also could be a bad MAF sensor. Try cleaning it.

i found what it was guys it was t-fitting vac line thanks for all your help

mine's been going on and off as well due to a vacuum leak (bad IC gaskets).