looks like your secondary trigger is going away as you rev.
you're running auditrigger, so your ecu relies on the combination of the reference pin and distributor to produce the pulse. that means one of two things (more likely the 1st)
1) your reference pin to distributor aligment isn't dead centered, so as you rev the distributor goes out-of-window relative to the reference pin. this happens as the t-belt flexes.
2) either your reference pin or cps signal physically goes away under revs. unlikely because the pin signal (VR) gets stronger the faster the engine revs and the hall sensor in the distributor is usually a pretty reliable signal. revs shouldn't really affect the relaibility of the signal. if its marginal it should be marginal everywhere.
The engine still runs because it already knows what TDC cylinder #1 is from seeing the cam pulse earlier at lower revs so it notes the problem but keeps going.
Grillage wrote:How would #1 be possible? The cam sensor only goes in one place and same for the flywheel.
I mentioned it in the post. timing belt flex. As the engine revs the belt stretches and dynamically moves the position of the pin relative to the shutter wheel in the distributor. that and slop in the distributor rotor itself.
it should remain in-window as long as the two are perfectly aligned and there is minimal slop in the dizzy.
So what's the remedy? Should I find a sonsor setup with a larger window? The belt isn't overly loose or anything. I just did the timing belt service a couple months ago. If everything runs okay should I just ignore it?
I know it was perfect once but now re-checking it would be a major undertaking. The only factor that could change the relationship between the two is the timing belt tensioner. I did do the TB job but I used the proper tools and was careful to tension the tensioner thing to the right length. Looking back at pics it appears to be the same length as the old one too.
ill try another distributor/cam sensor first. Happen to have one?
