2.3 pings at cruising speed.

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elaich - 25 Oct 2007 03:21 GMT

Here's a teaser. My '80 Capri 2.3 pings only at cruising speed (light
throttle.) I thought I had found the problem tonight, when I found that a
previous owner had disconnected the manifold vacuum from the distributor
advance. No manifold vacuum at a point where it should be high, so even the
weak ported vacuum at that spot can advance the timing too much.

I hooked the manifold vacuum back up, and the car does run better, but the
pinging is still there. Push the pedal down and it goes away. I did have
the head off several months ago, and there was little, if any carbon
buildup.

Any ideas?

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Backyard Mechanic - 26 Oct 2007 21:40 GMT

> Here's a teaser. My '80 Capri 2.3 pings only at cruising speed (light
> throttle.) I thought I had found the problem tonight, when I found
> that a previous owner had disconnected the manifold vacuum from the
> distributor advance. No manifold vacuum at a point where it should be
> high, so even the weak ported vacuum at that spot can advance the
> timing too much.

Are you sure you've got that right?

> I hooked the manifold vacuum back up, and the car does run better, but
> the pinging is still there. Push the pedal down and it goes away. I
> did have the head off several months ago, and there was little, if any
> carbon buildup.

Have you checked the plug insulators? I bet they are white as can be..
if so, it's no wonder you dont have carbon. You're running lean

I'd start with rebuilding the carb.

if that doesnt do it, increase the main jet size a little... you COULD
try running out the idle jets a turn and see if it affects.

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elaich - 27 Oct 2007 03:55 GMT

> Have you checked the plug insulators? I bet they are white as can be..
> if so, it's no wonder you dont have carbon. You're running lean

That's possible. It's that damned two stage Holley that costs $75 to
rebuild, and $234 for a remanned. The thing has four jets in it, and they
are all different. If someone ever took them out and put them back in the
wrong holes, that could be the problem.

> I'd start with rebuilding the carb.

See above. I'm gonna stick a Holley 350 CFM 2 barrel on it.

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