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« Last post by WestonE on April 28, 2026, 08:54:28 AM »
Hi Mark 2 things to add to the pile. Betas pre IE VX ran the fuel pipe over the exhaust pipe and did not use an insulator block between the carb and manifold. This leads to hot running/ hot starting issues particularly with modern fuels that evaporate far more easily. It is easy and sensible to put some heat shielding on the pipe crossing the exhaust just behind the subframe. You can get the insulator blocks on the the internet, but do check bonnet clearance.
I have tried tuning by plug colour AKA plug cut tuning with twin DCOE conversions and it is hopeless compared to a Dyno session. I also ran AFR gauges at various times and can view one on the Monte if I wish. More comfort blanket than useful. My Monte ECU does tune from AFR actively at lower load/ RPM as most modern cars do as well. Log files can show me AFR tracks over time. But I do not have the skill or the dyno to re-map.
You can test for air leaks with the engine running by spraying WD40 at manifold joins. A change of engine note will tell you where the leak is. You might need the rolling road to have another look, but sort out the hot fuel thing before going back.
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