Engine Missing and popping under load

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Kiwi Cortina
Posts: 391
Joined: Tue Dec 20, 2011 7:54 pm
Location: Novato Ca

Engine Missing and popping under load

Post by Kiwi Cortina » Sat Mar 11, 2017 6:32 pm

My Cortina runs thru the gears up to speed without missing a beat, but once doing 65-70 put foot down and under load it starts missing and backfiring. Let out of the gas a little giving it less load and it increases speed. I have checked wires, plugs, put a new distributor in it as the old one had a little movement in the shaft. It has Pertronix LS module with a pertronix coil. Any suggestions.

Thanks

Brett Wilkie
Posts: 1485
Joined: Sun Sep 16, 2012 12:42 pm
Location: Vancouver British Columbia Canada

Post by Brett Wilkie » Sat Mar 11, 2017 8:18 pm

Does it feel like ignition break down or is it possible that the carb is leaning out causing a lean misfire? What distributor? Ford or Lucas?
Anglia 100e modified
Prefect 100e stock

Kiwi Cortina
Posts: 391
Joined: Tue Dec 20, 2011 7:54 pm
Location: Novato Ca

Post by Kiwi Cortina » Sat Mar 11, 2017 9:42 pm

FoMoCo. I'm not sure as you can rev it up thru the gears and it pulls well. Its only in top gear and only above 65mph. It doesn't do it at lower speeds in top gear when you stand on the gas.

Brett Wilkie
Posts: 1485
Joined: Sun Sep 16, 2012 12:42 pm
Location: Vancouver British Columbia Canada

Post by Brett Wilkie » Sat Mar 11, 2017 10:02 pm

It is a bit difficult to diagnose from afar as there can be a few things that cause that sort of thing. Did it just come on suddenly or had you made some sort of change beforehand? High speed in top gear puts a fair load on when you give it throttle, fuel demand is up and a weak spark can show its face then too. I have heard of the Pertronix stronger spark causing problems arcing through standard rotors so check that and the cap too.
As I said many things can cause it, I once had a situation where my voltage regulator caused my car to miss like hell only when I gave it a high load. I measured the voltage and it kept going up to the point where the points/condenser could not handle it, soon as I disconnected the alternator the problem vanished although it is very unlikely this is what is happening to you. Keep checking.
Anglia 100e modified
Prefect 100e stock

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