Hi all,

I have a Manual 1991 Twin Turbo that has had a staarting issue for some time...

Tha car was hard to start from cold and would just catch after 20-30 turns and drove fine but after stopping for 30-40 mins would again be hard to start.

So I changed the air regulator and the car started first turn from cold, however after a few days the car would begin to have the same problem.

I changed the air regulator a further 3 times and the IAA valve once with the same result, would work fine the first few days then back to sq 1.

 

Last week I fitted a new timing belt, tensioner and idlers and removed the plenum, deleted the EGR valve and deleted the coolant pipes for the throttle bodies.

 

Also replaced PCV valves and most of the split and loose rubber hoses associated with the PCV vave and Air regulator/IAA.

 

Fitted a different Plenum with a known good regulator and IAA

 

Also has a Series 2 PTU

 

Started first turn! Happy Days!

 

Started fine the first couple of days

 

3 days later the car is hard to start from cold....etc etc

 

I am about to change the ECU, I have many but want to fit one intended for a manual TT but I don't have the serial no's to check.

 

Any suggestions would be appreciated

 

Thanks

When did you last change the plugs?

They are nearly new, bosch I think

The car started first time after each time I fitted new regulators

When you're cranking at the point of it not firing, is there fuel?

Not checked but there was pressure the other day when I removed the fuel relay to remove the plenum, tha car starts fine once warmed up unless I leave it for 30-40 mins then it needs cranking.

I will check fuel pressure in the morning. maybe I'll change the fuel pressure regulator as well

thanks

Check the fuel pump relay. Just check the fuel when cranking.

When it doesn't fire, have you tried bumping it and does it go straight away if you do ?

Do you mean bump start? Haven't tried it.