Re: running problems 156
Engine backfires for some reason (Leaky inlet valves?)
Petrol/air mixture in inlet manifold ignites and explodes.
Manifold is made of crappy Italian plastic, in top and bottom halves, held together with plastic clips.
Manifold splits. Clips break. Looks OK but there's a 3mm gap.
Air gets in, causing weak mixture. Car seems like it's running on 3 cylinders.
At high revs, leak is less significant so engine runs OK.
At low revs / idle, vacuum in manifold is lost and insufficient to keep servo working.
Every time you hit the brakes, the servo lets in more air and the engine loses even more power and stalls.
A wild conjecture. But exactly what happened to mine a few years ago. A 2nd hand manifold cost me about £100 and fixed the problem.
Let us all know what the outcome is.