G28, G40 and G4 sensors

[BrianSmith_S2]

Brian. That scope plot proves your timing is way off. The G40 pulse should align with alternate G4 pulses from the crank. This doesn't look like a bad sensor - it looks like a slipped belt or sheared key on the camshaft or crankshaft.

Look at the plot I posted on mine earlier in this thread. I can dig out others and/or draw something if you would fin it helpful.

Well the cambelts due a change anyway so i guess its a mixed blessing. I had the cam pully off to change the G40 and the keyway looked fine, so from what you say its either a slipped belt or crankshaft key. Hoping it hasnt done any damage I mean how far can it be out before valves start hitting pistons?

As you say the G40 pulse aligns with every second G4 pulse, but i cant see it that clearly in the plot you posted earlier as it shows the a G4 pulse mid way between each G40 pulse.

Cheers,
Brian

[S2central.net]

Have a look at this - http://www.s2forum.com/forum/showthr...272#post525272

You will see that your pulses are out of step - the gaps between G4 and G40 individually are correct - but they are not in sync. If G4 and G40 do not line up then ECU will not start the engine - otherwise you might have na$ty valve & piston contact. ECU is saving you a fortune really !

They don't look to have moved much so you should be OK - hope its a near miss.