Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi there, I am Cam. Does the knocking go down or away when driving?
Ok the surface it sounds like an injector. We can tell by the balancing rates on the injectors at idle when hot. Spec is +/-4 on each and any outside of that is excessive and requires replacement. second likely issue is a push rod issue.For now, check the balancing rates and see.
That is only done with a scanner. The balancing rate is the computer trying to adjust the flow rate on each injector to keep things running smooth. Outside of that spec shows that the computer is noticing differences and is trying to adjust it. IF you see an injector at -15, that suggests its leaking or +15 is the injector plugged or not flowing properly. Again this is only done with a scan tool.
It would be a full scanner, like the GM tech 2, snap on solos. Not a code reader.
No, because the injectors are in groups, killing one injector will kill the group and they re also 93volts so its dangerous.
Thats not good. I wish I could tell you another way to do this but there is no other way. the nature of the system prevents simple testing.
Smoking also is an indication of injector, yes. Given these issues I am really thinking you need injectors. Have they ever been replaced?