Symptoms of cam timing error

It could be a bad working fuel pump too and even a not completely open fuel tank venting tube, that makes the fuel pump cavitate when the temperture in the engine bay becomes high.

And AndyWW didn't write a bad thing: it could be that too.



ciao

 

you can also check for an air leak somewhere: try to spray some WD 40 around the airbox, intake manifolds and air filter box (not on the exhaust manifolds...) with the engine idling. If RPM goes up a bit when you are spraying, there is an air leak

good luck


ciao

 

Check the venting tube. Drive the car for a bit, stop the engine and immediately remove the fuel tank cap: If there is some depression inside you found the problem

Ciao

 

Thats a good point, because in the pictures on this and the other thread, the vent pipe seems to be missing. It should run across the top of the bulkhead next to the fuel supply pipe and the larger vapour balance pipe. Its a small black hose which connects to an outlet at the top of the filler neck and runs across then down again to emerge near the bottom of the RH tank.

 

Just another idea

Backfiring means too much fuel burning in a hot exhaust
The cold start valve of my friends 328 was leaking some time ago
causing hot start problems
Maybe yours is starting to leak when the engine gets hot

 

Do you have glowing header(s)?

 

By depression you mean a sucking sound?

 

Exactly: I apologize fir my poor English.

Ciao

 

What is this cylinder and piping in the picture- looks like a home made job ? Pipe has kinks in it ?

 

Yep it is certainly kinked and I think we all know EXACTLY HOW it got that way.

 

I think you will find that is not original, its a different shape to the eurospares diagram. The piping itself is cadmium plated with a finish called passivation hence its greenish colour. It is seemless piping used in the hydraulics industry as i have used it at work- very good stuff if bent correctly but that is a terrible job. You can buy lengths of it and bend it to suit with a pipe bender. The kinks in it looks like it has been bent in a vice rather than a proper pipe bender.

On my mondial the fuel filter was down by the fuel pump and away from the heat, behind the right hand wheel insert. Is that the correct place on a 328 as i am not sure.

If that is the fuel supply line, where is the return line back to the fuel tank ?

 

Are you kidding?

I wish I knew two languages. I'm stuck in just one (specifically, Southern English/redneck)

 

A friend car (not a Ferrari) had more or less the same problem. At the end we discovered it was a missing heat shield in the engine bay that overheated the fuel line. But in the 3x8 Euro I don't remember any heat shields so maybe it can be a pipe out of place: Possible, but not probable.

Ciao

 

Is that pipe hot when the engine has run for say 30 minutes as should be cool, also put your hand on the return line and both should be same temperature- this should prove you have flow from the tank via the pump and its return to the tank. This flow will decrease the heat in the pipe , like a cooling effect..

It should be easy to put an alloy shield bent to the same curviture as the fuel filter about 40 mm away from the filter- the 40 mm air gap will stop a lot of the heat.( air is a very good insulator)

Looking at the poor fit of the pipe, that might be why it is not behind the insulation as he did not know how to bend it correctly. Get some house loft insulation and put around the pipe with some thin wire, then cover it in kitchen alloy foil, do this as an experiment as it costs nothing and see if it helps.

 

Have a look at your other thread, someone has posted a pic of a 328 pipe and the insulation

 

I would get rid of that insulating panel

 

I'm sorry but I sold my 328 one month ago. I have a picture of the engine bay somewhere but it doesn't show that detail. Does your car have a catalytic converter or is that still 100% euro without any catalytic converter? I remember that the room between the engine and the passenger cabin was wider than your one: Maybe the problem is that, due to a too big insulating panel

Ciao

Edit: I don't remember an insulation around the fuel lines: There is something strange in your engine bay, but I don't work by myself on the engine so maybe I'm wrong