155 v6 big BOOM when starting it
Yesterday after washing the car i went to take some pictures of it with a friend. When i turned the key to start it (starter motor engaged) heard a big boom under the bonnet, opened it and found the intake plenum had moved away from the inlet pipes.
First guess was bye bye timing belt, but after a quick check (took the cover out) I found everything in order.
Last night it did it again, same way, cold engine fuel pressure ok, put the plenum back in and it started no prob "first" try.
After that i headed to the motorway, had to do 35 miles to get home, pulled ok while pushing it, but it doesn't feel quite as crisp, specially over 5000rpm. Got home ok, left it idling the usual 5 minutes and left it there.
A friend of mine told me it could be bad fuel, as i recall i had refilled that same morning, and bad fuels are a big problem here. Exhaust emissions don't smell the same as always.
Any ideas on what this could be?