7M GTE ignition timing guide needed...

[amebb]

Hi there

I have followed all the guides that there are for the setup of the timing etc

I will just explain in detail what has been done so far with the alignments etc..

a) The crank shaft is set at ZERO.
b) No 1 cyclinder is at TDC. I have checked this by inserting a stick making sure that the piston is at its highest point.
c) The cam shafts have been installed with the PIN in the middle of the holes.
d) The cam shafts have been aligned with the notches on the backplate.
e) The CPS was inserted into the head where the notch was aligned to the hole on the CPS.

When i tried starting the car the engine sounded rough and back fired etc etc .

When i checked the timing using a strobe light the timing was miles out.... and i could not correct it by turning the CPS.

So i repeated all the steps upto step e).

At this point the CPS was reinserted but it had been turned about (approx) 180 degrees.

The car started first time and sounded good too.

I let it warm up and then after ten mins i checked the timing with the strobe gun and managed to set it to 12 degrees with no problems.

Not really sure what the issue could be and not even sure i the CPS has been rebuilt wrong etc.

I have checked the CPS and TPS to see what readings i get from them and they all seem fine and within recommended tollerences.

So, what else can i try ...?

Cheers

[Bill UK]

Sounds familiar: 180 degrees, Link see the paragraph just below the 16th picture paging down.

CAUTION: The gear must be put back on the correct way. It has a 13 tooth wheel, so you can be 180 degrees off and really screw up. The TSRM describes how to align the gear properly. Basically you point the reluctor at G1, and then put on the gear so that the little hole lines up with the slot in the CPS housing. http://www.cygnusx1.net/Supra/Librar...ion=IG&Page=23

[amebb]

Hi Bill

i have checked my CPS and its not leaking at all. The gears are in good condition also.
I dont think i need to touch the CPS in anyway. After all it was working fine before the head gasket blew and had to be replaced.

Perhaps the previous owner moved things around in the CPS ...who knows.

I will try to get hold of another CPS to test in the car. If that works then i know its my CPS that was wrong. However, i have taken resistance measurements and they all seem fine - within the allowed tollerences that toyota recommends.

Not sure what else to try now....

Thanks

[Bill UK]

Sounds like the gear has been installed 180 degrees out of position on the shaft; the only drawback is when you install the CPS (as you said) you need to turn the gear 180 degrees to compensate. Found this photo below of a CPS when the notches are line-up. Personally I would leave it as it is; it’s only the grove/hole on the gear/shaft that would be wrong for installation.