question about some codes my truck threw. its a 99 2wd blazer. it threw a P0300 and a P0440 the only thing these two codes have in common is a possible vacuum leak. It doesn't drive abnormally or feel like it has the random miss fire like it claims. New cap, rotor, plugs, wires.... What else could be causing a "Vacuum leak" causing this code to appear?

 

Welcome to my world. 440 can be a bad gas cap, purge solenoid on the fuel pump, vacuum leak, etc.

IF you figure out a fix for it, PLEASE post the fix. I've given up on mine(and it doesn't seem to affect performance).

 

P0440 is an EVAP code check gas cap and the rest of the vacuum lines in the evap circuit

 

Run a search for the code #'s, I know we have discussed both of these quite extensively before.

 

little off topic but i have a question. see i just got a 1995 blazer lt 4x4 has a new motor (vtech) and a tranny rebuilt 50,000 km ago. but the check engine light is on. question one is there a way to check the error codes with the ignition and counting the blinking lights?
question 2 i have 3 buttons for 4 wheel drive 2, 4hi, 4lo when i am at stand still i pushed 4lo it blinks few times and 4hi lights up and stays on also is there suposed to be a light for 2 wd ?

 

Kracked Jack, have a look at THIS THREAD for information on 95 codes. Please post a separate thread with your other questions. They really have nothing to do with the topic of this thread.