you could pull number one and number four plug and see if there the same tdc. but I would be more prone to think that the rubber on your harmonic balancer is getting old.
Important point - I am not trying to show off how smart I am with this post. I have disassemlbed my fair share of 1.3 and 1.6 engines and am simply trying to share my experiences and wisdom (what little I have) on the topic at hand.
Not all crankshaft accessory pulleys (notably the 1.3 pulley & the 1.6 too!) have rubber in them. Maybe in V-6/V-8s but not these little engines!
Additionally, The timing belt pulley is fitted directly on the end of the crankshaft - not the accessory pulley, which is attached to the crank timing belt pulley. Thus, the "rubber part of the harmonic balancer being blamed for bad timing" argument will not work.
Wallowing of the keyway that holds the timing belt gear to the crankshaft is a very common event with the 1.3 and 1.6 engines.
Unfortunately the cause is not a design flaw but the acts of a booger-eating Moron mechanic/Previous Owner who tries removing the accessory pulley by removing the bolt in the center of crank instead of the 4 (5 in the case of the 1.6) bolts that fasten the accessory pulley to the crankshaft timing pulley.
If you look at the accessory pulley as the engine is running and you notice ANY wobbling of the pulley, you have a wallowed out crank keyway. You need to check it and see if it can be fixed.
for more info on this procedure, see this link:
http://bbs.zuwharrie.com/content/topic,26263.15.htmlBack to the topic at hand...
Sarge - the Samurai Weber Guru - once said that "a Weber is only as good as the engine it's installed in." If you have low compression, bad valves, timing problems (see above) and other similar engine wear, a Weber is not gonna magically make your engine run better. Check and fix these problems first - then concentrate on the Weber.
I installed a Sarge-prepared Weber in a newly-rebuilt 1.6 8-valve and got great results by following this wisdom.
I hope that this helps!
