Need Help With My Gts-t

[Merilious]

I have a 1990 GTS-t that im having a problem with. My car has a slight hesitation problem, its not very often but heres somthing that I think is very weird. The cam angle sensor is fully advanced and if I try and retard the timing even a tiny bit the hesitation problem will get severely worse. It only runs right(I use that term losely cause it still hesitates) when I have the cam angle sensor timing fully advanced.

It has not skiped a timing tooth, and almost every sensor on the car has been checked. Anyone have a idea why I would have to have it at fully advaned timing to run right? Im running 94octane gas and always have.

TIA.

Edited February 21, 2006 by Merilious

[iandawsonwa]

its probly running realy lean. if your running 94octane you should get a better fuel pump and a rom tune or power fc. Your timing so advanced to make the car even run on a low octane fuel.

[blind_elk]

Canada has a different octane rating system, so 94 is probably OK.

Merilious, what is the base ignition timing? The CAS should have some adjustment available. The CAS might be on 1 tooth out, because of a broken locating key in the end of the camshaft, but I doubt it (it usually moves the CAS too far for the engine to even start).

[REDGTT]

Honestly the Crank Angle Sensor could be damaged. SImple problem. Borrow someone elses and see if it makes a difference. The other thing to look for if it hesistates and surges after 4000 rpm is a boost piping leak.