[frenchie]

I have a 89 camaro rs that runs fine at idle but going down the road you here a slite ping like when you run cheep low grade gas then the cheak engine light comes on then you lose power to about 1/2 but as long as the engine light is on there is no ping.I have spent 500 dollars on sensors not yet fixed problem can any one help???

 

[kustomwerker]

did you do the knock sensor???

 

[frenchie]

yes i did replace the knock sensor and the throdle pos sensor and oxygen s. i was wondering what it would act like with a partially clogg cat?

 

[dale68z]

What is the ignition timing?

 

[kustomwerker]

a clogged cat will make it ping as it will increase internal cylinder temp because of not letting the exhaust out...can you get it scanned???that would be helpful in the diagnosis...

 

[ZZ_430]

EGR valve will do that too.

 

[frenchie]

thanks for the help guys i will try cheaking the egr valve or see if cat is cloged if that dose not fix it i'll post it thanks again....