My Stag has issues on inclines

[Nick at 84]

I have had my Triumph Stag since April 2018. It had blown head gaskets, and these had to be replaced. The gaskets had not been replaced before and the engine had to be removed from the car to do the work. At the same time piston 3 was found to be holed and was replaced.

The car had covered 400 miles since the head gaskets were replaced and as recommended, I had the head torqued down. At the same time the overdrive system was recommissioned.

Since then, I have had a problem with the car starting and running but once warmed up it starts to misfire and loses power. In particular when it is on an upward slope it loses power, and I am unable to continue the journey. If I leave it for say 10 minutes, it will run again for about 10 minutes before the problem re occurs.

The condenser and coil have been replaced. The timing and carburettors have been checked.

I have had help from my garage but they and I would very much appreciate some guidance.

I am based in Tayside and would in addition welcome input as to who could help with the Stag generally. it seems many skilled people have retired.

[APS]

sounds like fuel starvation if the problem is worse facing uphill.
If you have a clear plastic fuel filter in the engine bay, as you should, is this refilling with fuel when the engine is running ?
Also what carbs do you have, original Strombergs or an aftermarket one ?

[trunt]

I would start by testing the fuel pump. Disconnect the line after the fuel filter and pipe the line into a jar or something. It should flow at around 6-800 ml per 30 seconds (according to a quick search!)

The flow should be steady, not spluttering which would indicate an air leak on the pickup side, the pumps voltage could be down from bad connections eg the inertia switch or as above the filter could be clogged, but my experience is they never look full.

[Nick at 84]

Hi Terry

Thank you very much for your suggestion; I will investigate.

Yours aye

Nick

[Nick at 84]

Hi APS

Thank you for your suggestion, which ties in with Terry's diagnosis. I will action your suggestion. The car has Strombergs which I think are original.

Kind regards

Nick

[gbb483]

Mine also has fuel starvation problems going up a particular hill. I put it down to having very little fuel in the tank and a significant slope on the hill. Fortunately it's not much of a detour to pick a road where the slope is not so abrupt.

[dasadrew]

Can't fault the above suggestions but ... I had an almost identical set of symptoms which turned out to be my electronic ignition (one of the cheaper ones going around). Don't even ask me how that was the cause - maybe vacuum is different when the car is challenged to climb a hill and the baseplate moving in the distributor didn't meet with the approval from the electronic box. Changed the ignition for the exact same unit and the problem was gone. Posts concerning this ignition module (autospark I think) indicate that the module simply doesn't last forever.