could anyone tell me how do you guys adjust the timing because i find it impossible to see the harmonic balancer saw slot so i can align it with the 0 degrees on the timing chain marks? tried looking at it from every angle without success hope you can help me out thanks

 

I sort of don't understand your question.. but I'll give it a try.

I think you're calling the tab on the timing cover the timing chain, right?

Unless you have a scanner, you pretty much need to see the timing mark on the balancer.. unless you adjust it by ear. It may be possible that the outer ring on your harmonic balancer has slipped..and the mark has moved underneath so you can't see it. Try looking underneath the engine with your timing light, if you can see the mark there it has probably slipped. If not, turn the engine over until the balancer slit faces down and get under the car and paint it and try again. The line may not be white anymore.

 

Brings up a good point tho - how do you (WITH A SCANNER) check the timing? I know you can read the timing at idle, but is that the 'setpoint' you are looking for?

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'79K5 Blazer with 406TPI

 

You cant determine base timing from a scan tool, that has to be checked off the balancer markings. You have to disconnect the lead from the ecm (brown wire/black stripe) to disable the advance and then you check it. There is a setting in the prom for base timing but its just so the ECM knows what its supposed to be set at, where its set the ECM does not know.

 

thanks for info i clearly understand now the procedure and a word of thanks to madmax for the article on removing the smog pump legendary to say the least ciao for now

 

It was actually Pablo that wrote it, I just supplied one of the pics and one of the belt sizes for him.

 

Is that at the back of the distributor?



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'79K5 Blazer with 406TPI