Author Topic: Calibra - C20XE Too Much Ignition Advance  (Read 1084 times)

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Offline StefanWylde

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Calibra - C20XE Too Much Ignition Advance
« on: August 20, 2018, 22:47:18 PM »
I've got a major problem with my C20XE. For all of those who don't know, the ignition advance on idle for C20XE is 16 degrees bTDC. The problem on my car, is that the ignition advance on idle is 20 degrees bTDC, and under load the engine is pinging and then retarding the timing and losing tons of power. Basically the engine is loud and makes tons of vibrations. When I start the car, the advance is normal (16 deg. bTDC), but as soon as I rev it up a little bit when it returns to idle the advance is 20 deg bTDC, and it won't go back to normal. I literally swapped the ENTIRE loom, my engine had a distributor(m2.5) and I swapped it for a DIS ignition type(m2.8), with proper ECU, MAF sensor and EVERYTHING. Literally every single sensor has been replaced, INCLUDING the crankshaft angle sensor, camshaft sensor, CTS, TPS. Even after all these changes the engine still has too much advance on idle. If I don't solve this quickly I'm going to have to buy another cally as I'm obsessed with this damn car.

This is my ignition at idle:


This is my friend's Astra GSI: (the way it should be) (also on idle)


As you can see the difference is about 3 degrees on average which is about 1 tooth (I think)
I checked the timing marks and everything lines up properly(crankshaft and both camshafts). Any clues or similar stories you have had?
The engine idles nearly perfectly, no mis-fire, it revs normally along the entire RPM range, with no sputters or anything. It just lacks like 50 horsepower compared to normal and causes massive vibrations like a damn diesel in the cabin (because of the improper timing control)

Offline Jepwee

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Re: Calibra - C20XE Too Much Ignition Advance
« Reply #1 on: August 21, 2018, 20:17:23 PM »
Hi , Has it got a knock sensor fitted?. Its worth having a look at Google on the functions of the knock sensor on timing.
 Cheers

Offline StefanWylde

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Re: Calibra - C20XE Too Much Ignition Advance
« Reply #2 on: August 22, 2018, 00:27:05 AM »
Hi , Has it got a knock sensor fitted?. Its worth having a look at Google on the functions of the knock sensor on timing.
 Cheers
It has a knock sensor, and even when I disable it, it still sets the timing to 20 degrees bTDC.

Offline Jepwee

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Re: Calibra - C20XE Too Much Ignition Advance
« Reply #3 on: August 22, 2018, 21:35:26 PM »
Hi, I remember reading on the forum sometime ago that they found the crankshaft cambelt cog on a C20XE engine was worn against the Woodruft key causing the timing to be out. Not sure where in Search you will have to look, maybe "Woodruff key/ crankshaft sprocket/ crankshaft pulley for C20XE.
 Cheers