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Author Topic: Engine Timing Question  (Read 1756 times)

Offline Conker

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Engine Timing Question
« on: 13 January 2008, 10:40 »
Hi all, question regarding my 1991 16 valver...

I recently solved the misfire on my 16v'er by adjusting the timing using a timing gun and turning the distributor until the marks lined up. Last night I saw a picture on VWVortex that made me think something was wrong.

In the picture below, you can clearly see the timing marks. Unfortunately I have timed mine to the red X, not the 6 degree BTDC mark. The question is, it runs better timed at the red X shown below than at the 6 degree BTDC. What does this mean?  Does it mean my CO2 setting is well off or something like that? I.e. Im compensating for a weak/rich mixture by retarding/advancing the timing???

The odd thing is its now running 95% perfectly, apart from a slight stutter below 2000rpm when the engine is warm (its not there when cold). The other issue is that the distributor is FULLY turned anti-clockwise i.e. it can't go any further, and yet the engine seems to want to be turned even more that way to get it running 100% perfect.

Please help - I need to do a long journey in it on Tuesday and want to get this sorted ASAP.



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Offline saul79

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Re: Engine Timing Question
« Reply #1 on: 13 January 2008, 10:42 »
it should be 6 degrees before tdc :smiley: with the middel off the rotor on the line on the dizzy. :smiley:
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Offline Conker

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Re: Engine Timing Question
« Reply #2 on: 13 January 2008, 10:49 »
I know it should do, but it runs better when its more than 6 degrees BTDC ?!?!?!

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Offline saul79

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Re: Engine Timing Question
« Reply #3 on: 13 January 2008, 11:09 »
weird :smiley:
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Offline Conker

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Re: Engine Timing Question
« Reply #4 on: 14 January 2008, 08:21 »
Anyone got any ideas??  I've got to fix it today   :undecided:

(I don't want to do a long journey tomorrow if its not 100%)
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Offline Mew

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Re: Engine Timing Question
« Reply #5 on: 14 January 2008, 12:43 »
You're not using a timing gun with an adjustable advance are you?
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Offline Conker

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Re: Engine Timing Question
« Reply #6 on: 14 January 2008, 13:18 »
Quote from: Mew on 14 January 2008, 12:43
You're not using a timing gun with an adjustable advance are you?

No, its just a boggo standard one, but cracking idea though Mew - that would be a perfect explanantion, as thats just what it feels like, i.e. its running reasonably well, but just at about 10 degrees BTDC, not 6 degrees.

Other very random ideas I've had...

1) The previous owner did something to it so that ran fine on 95 ron petrol, and since Im putting v-power in it its throwing out the timing?!

2) The static timing is out on the pulleys/crank?!

3) Its got a mild sports cam on it (don't think so)?!

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Offline Mew

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Re: Engine Timing Question
« Reply #7 on: 14 January 2008, 13:22 »
Quote from: Conker on 14 January 2008, 13:18

Other very random ideas I've had...

2) The static timing is out on the pulleys/crank?!


That would be the first thing i would check  :wink:
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Offline mk2mark

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Re: Engine Timing Question
« Reply #8 on: 14 January 2008, 18:16 »
10 degrees is not that excessive, as long as it starts ok and doesn't pink under load leave it as it is - wouldn't venture lower than the high octane stuff you're using though.
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Offline dTEA

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Re: Engine Timing Question
« Reply #9 on: 14 January 2008, 20:28 »
Quote from: mk2mark on 14 January 2008, 18:16
10 degrees is not that excessive, as long as it starts ok and doesn't pink under load leave it as it is - wouldn't venture lower than the high octane stuff you're using though.

 :grin: mine loves Tesco's cheap sh1te!!!
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