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Hi all,
First off great site, have seen some really good feedback from here.
I have just aquired a 89 gq 4.2l carb/petrol only lwb.
It idled at 2g when I got it, new plugs, clean dizzy, leads not tracing and now idles at 900, I'm happy with that also had 4kg of oil pressure at idle but dropped to almost nothing at revs, changed oil and filter and now idles at almost nothing but rises in revs, also tappet noise is now evident.
(Valvoline xld 20w50).
After all that now its got a Huge miss, on and off load, even on idle,
I've tried new balast, new coil, new points, different leads(200k old) and no change, tacho goes all over the shop,
Sprayed wd40 over manifold gasket, no change. I have a fairly decent exhaust gasket leak and a crack in manifold.. how exhaust sensitive are they?
Carb is fine on it, it use to cold start on the first revolution but now ya gotta flog the loud pedal to get it to happen, Iknow that makes it sound like fuel issue but next time it starts fine.
Hot or cold doesn't seem to affect it, more how its feeling atm.
It always had a intermittent miss but now its huge.