Plug change + valve adjustment

[Kris]

Hi,

I have recently changed the plugs and checked the valves and adjusted them when needed, but they all seemed pretty much spot on and so the adjustments indid make were very minor.

When i then started the engine, expecting it to sound pretty much as it did before I changed anything. But Instead it it sounded very rough and back-firing.

Please does anyone know why this would happen? I have checked and adjusted the clearance on the new plugs as I thought this was the cause of the problem and as I replaced them one at a time the HT leads are in correct place. The only other thing I have not checked it the the distributor cap is on correct, but I 99% sure it will be.

Would the work I have done effect the timing and cause this problem? Please help!
Cheers kris.

 

[mattd1984]

What clearence did you set the plugs too?

Check all the ht leads are on correctly and check you haven't put a lead onto the wrong plug? Also what condition is the dissy cap in?

 

[Kris]

Hi thanks for your telly. I set the plugs to 0.006 as it said in my Hayes manual, I think that that is ok. The distributor cap is in good shape as are the rotor arm and HT leads.

 

[crede999]

hi kris

have another check if nothing obivous follow these links it should help you out
http://www.vw-resource.com/backfiring.html" onclick="window.open(this.href);return false;
http://www.vw-resource.com/misfiring.html" onclick="window.open(this.href);return false;

regards

chris

 

[71Westy]

Kris,

The plugs should be way wider than 0.006" - I've seen 0.024" or 0.025" specced - although my tuner chap suggested wider may be better (like 0.027). 0.006 is the valve clearances....

Cheers,
Nick