Timing Problem R33

[master_illusion]

Hi People,

Ok I have over used the search funtion and have found part of my issue and resolved it. But I still have a lingering problem.

I have put a timing light onto my car and adjusted the timing to be 15 degrees BTDC at idle, but as soon as I rev the motor it jumps off the scale to the right, and probably goes another 2 marks past the last mark.

Can I safely say that the CAS is wrecked or could it be something else that I am overlooking. The problem that I am having with the car is that it gets onto boost ok and holds it promptly but it seems as though it does not know what to do with it and its much better on the pickup if i hold the throttle half way down than go all the way through the rev range, rather than WOT.

Any ideas would be extremely helpful.

Regards

Master Illusion

[WogsRus]

humm your timing is supose to change as the engine is reved it is normal.

[cliff25gtst]

so what happens when you use full throttle? does it gather all the boost but really not go anywhere??

just really slow and sluggish??

[master_illusion]

cliff25gsts - If i put my foot down it does exactly that, it gets onto full boost, 8 PSI at the moment, but just lags all the way to the red line.

WogsRus - I know that the timing is supposed to change but i didnt think that it was supposed to change to the point that it was off the scale.

Eg | <--First Mark Last Mark ---> |..................... : <----- Timing jumps up to here if i hold it at approx 2000 RPM.

Edited June 12, 2007 by master_illusion

[blind_elk]

Firstly, these engines can run some high ignition timing at low load (eg cruise) conditions. 40 BTDC would not be unheardof. Standing revving at 2000 would be one such "low load" condition.

Secondly, depending on how you use the timing light, and the timing light itself, you may have actually set the base timing to 7.5 BTDC, which is retarded and will cause the spark to fire too late to achieve optimum burn.

[WogsRus]

yeah that is what happens, don't forget once of the throttle the timming will be retarded on the off throttle load.

[master_illusion]

Hmmm....

Are there any other things that I should be looking at for the problem then. I pulled the timing signal from the module on top of the plastic cover. Above cylinder 6. Pink wire if I am not mistaken, 2 wire connector, came off the turbo side plug. This correct or did I pull it from the wrong wire?.

Could a dying fuel pump or fuel regulator also result in these kinds of symptoms, as these have not been changed from std items.

I have done the sparkies NGK's (Copper) gapped to 0.8, coil packs are OK, timing belt is probably getting of age but would expect the car not even to start if that had any problems like jumping a tooth.

Just trying to rule out everything that it could be so I can narrow it down to a specific problem.

Thanks Heaps PPL.

Edited June 13, 2007 by master_illusion

[mad082]

my mate had a problem like this in his ca18. it would make full boost (1 bar) by 1500rpm and take about 5 seconds to rev up to redline. it was really bad to drive. we advanced the cas as far as we could and it made it nearly normal. we tried a new cas but didn't really help. we ended up thinking that it had jumped a tooth on the timing belt till he sold the motor cheap and the new owner opened it up and found that a cam had snapped.