Do you:


1. Warm up engine, turn key to on but not running, push throttle to floor and hold for 1 min, release throttle, turn key off, wait at least 30 sec and restart.


or


2. Warm up engine, push throttle to floor, turn on ing and leave on 1 min, turn key off, release throttle, wait 30 secs and restart?

I dunno.


I'd guess A


Try loosing the three 15mm pump bolts and push the pump 1mm driverside and do it again. This will help to take up slack in the timing chain and get it toward the advanced or before TDC range. Remember 1mm=2deg

David, either way will work.

I'm interested in QM's timing tweak "to take up slack in the timing chain".


What benefits would I notice if I did something like that?

The timing chain slack varies from .5"-1" depending on wear. Moving the pump 1mm driverside takes it up. This can help if slack in the chain is trowing the IP off alittle, causing float/ mild surge in the APP range. Having a scanner with TDC offset displayed is the only way to know for sure where you are in time but 1mm to the advance should be right off where it was last set.

So would it start easier, pull better, increase/decrease gas mileage, idle smoother/rougher, smoke more/less at startup, snappier/doggier throttle...???


Exactly what would a guy notice?Edited by: w_huisman

It really hinges on where the pump is. If it's at -.5-.75 before TDC, then 1mm advance would put you at -2.5 to -2.75 before TDC which is a little advanced( trying to show why scanner is so important to getting it nailed down.) But if the chain has acquired .3" slack it could be -2.2 to -2.45 before TDC.


If you take the time to make sure it's between -1.5 and -2.0 before TDC and then initate TDC learn, it should start easier, respond better, and run smoother.