Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Engine cuts out when warm

Hi, my car is a 1969 4/4 with a Ford 1600 engine. Recently, it has been starting fine but after an hour or so driving it starts to run poorly and cuts out when I stop and then apply the throttle (at roundabouts or in traffic queues). Is this timing or fuel related? Thanks for any advice. Paul

Paul,

It sounds fuel related as it is triggered by the engine being warm. Which might suggest either a vapour lock or perhaps a venting problem in the fuel tank. Those more knowledgeable than me will no doubt be along shortly.

Pete

What carburetor do you have? If a Weber does it have the thicker "heat proof" gasket?

Hi Richard, thanks for answering.It is a Weber, I had the engine replaced several years ago with one with Stage one tuning. I'm not aware of a gasket (it's covered with an ITG filter) Sorry I'm not very technical but I hope this might help. Paul

Hi Richard, just checked properly. It's a twin choke Weber, not sure about the 'heat proof' gasket though. Paul

The two issues are the heat soak from the exhaust, and the heat soak through the inlet manifold. If it's cross flow at least the exhaust is on the opposite side to the carb. If both on the same side you'll need a heat shield between the two manifolds. the heat proof gasket is very important, so look closely between the carb body and inlet manifold. It may not be easy to see what's there but if in doubt fit a thicker gasket and consider a heat shield under the carb to deflect rising heat from the block. You might also consider wrapping the manifold although I'm not really a fan of that option.

The gasket will look something like this depending on the model of carburettor.

You lily find it between the carburettor and inlet manifold (the one on the drivers side). See if you can visually check it's condition.

Thank you Dave & Richard. I'll check the gasket. Paul

This could also be choke related, or even High Tension leads that start to bbreak down once the temp in the engine bay gets up. This is typical with Some silicone leads

Not wanting to add too many options but typical coil breakdown is when hot. I moved my coil on my TR6 to a cooler location in the engine bay and no more problems.
Steve