hi i have an 88 camaro with the 305 tbi and i am continueously throwing codes 42 and 43 i adjusted my timing which was advanced by like 4 degrees and the check engine light comes on less often now it usualy comes on if i accelerate hard does anyone know what could cause these?
thanks

 

est(electronic spark timing) is probably gettin false signals from the knock sensor if its bad. or your knock sensor is probably unplugged.

 

where is the knock sensor located?

 

on the side of the engine block, right above the starter. its a one wire connector. those connectors are known for falling off or breaking easily when working around it.

 

ok thanks alot is this somthing that would be expencive to replace?

 

no, pretty cheap. if its the connector, you could get one off a junk yard one, or rig it to stay on. if the knock sensor is bad, just get one at a parts store (idk how much, should be cheap).

 

cool thanks alot how long will it take for it to register if its fixed?

 

as in plugging it back in?, imediatly. well, actually when it warms up at around the time when the esc should retard it. and if your codes dont come back after cleared.

 

Just wanted to say, i got the 42 code. What fixed mine was replacing the distributor. 100bucks but well worth it. Car runs 100% better. Corrosion was on the sensors when i took the cap off. I guess it got a little wet somehow.