timing the ole sub

[Lt.Del]

Thanks.  and EST is Electronic Spark Timing.  I have learned a lot in the past two days about these computer controlled vehicles.

Thanks about that bit about Zero being the beginning timing.  I have advanced it slightly and we'll see how it goes. I think she runs great now, i believe I had it a tad too advanced--but she wasn't pinging/detonating but that may be partly due to the knock sensor and the ECM controlling the timing somewhat.

thanks for the help

[rockable]

I'm having a hard time locating this wire on my '86.  Anyone got any ideas?  Is it part of a cluster connection or is it a single wire?  Could it be behind my engine somewhere.  I've looked pretty hard for it, already.

Thanks,
Rock

[frogman68]

I'm having a hard time locating this wire on my '86.  Anyone got any ideas?  Is it part of a cluster connection or is it a single wire?  Could it be behind my engine somewhere.  I've looked pretty hard for it, already.

Thanks,
Rock

Look by the brake booster it should be a stand alone wire

[VileZambonie]

I'm having a hard time locating this wire on my '86.  Anyone got any ideas?  Is it part of a cluster connection or is it a single wire?  Could it be behind my engine somewhere.  I've looked pretty hard for it, already.

Thanks,
Rock

You'll have to give more details on your 86. Engine? Fuel system? Driveline? California or federal emissions?

[rockable]

305/4v/non-CA.  Assembled in Canada.
Thanks
Rock

[Lt.Del]

were '86's computer controlled.  I didn't think so. If not, you wont have that brown wire.

[rockable]

It does not have an O2 sensor and the emissions label says nothing about disconnecting a wire.  It says to plug the vacuum line from the distributor and set a 4 degrees BTDC.

I'll bet you're right.  I've looked all over and, unless it's hidden behind the engine, it's not there.

Does anyone know for sure?

[VileZambonie]

DETAILS

C10, C20, C30, K10, K20, K30?

Automatic or Manual?

Are you sure it's not California emissions?

If it's non ESC controlled plug the vacuum hose going to the distributor vacuum advance. At operating temp idling set initial timing to 4°-6° BTDC

If it's ESC warm the engine, shut it off, disconnect the 4 pin connector at the distributor, restart the engine and set the timing to 6° BTDC

[rockable]

It's a Silverado 1/2 ton C10.  It's got the 305 4 barrell carb, non-"computer controlled" model and a 700R4 tranny.  It's NOT California, for sure.  It's never left NC.  I've got the original paper work where it was delivered here.

I'm pretty certain it does not have ESC.  How could I tell for sure? 

I plugged the vac line, set the idle speed and set the timing at 5 degrees BTDC.  It's running the best it's ever run since I fixed the vacuum leaks, replaced the thermal vacuum switch, changed the intake gaskets and put a rebuilt carb on it.