Engine Hesitation

[Sparkie90]

Hi guys
Any help gratefully received...   The engine has started hesitating under hard acceleration particularly in 4th gear. Done 50k. Any ideas?

Just changed the cam follower. Old one was worn, but new one has not made any difference. The fuel pump and camshaft looked fine from what I could see.
Cheers

[K1NGY14]

Have you changed your main thermostat?


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[Sparkie90]

Hi,

No not changed the main thermostat, is that likely to be related?  I have noticed the car doesn't always stay at 90 on the temp gauge too, often sits at 80-85 unless stationery, could this be related then?

Cheers

[pudding]

If it gets colder when you start driving, that does sound like a knackered thermostat.  Very common.

As for the hesitation, does it feel like the boost hits hard and then immediately holds back, then goes again?  If so, I would check the O rings in the boost pipes for leaks.  A visual clue is oily patches around the clip connections.  That is PCV oil being blown out of the connections along with your boost!

If not that, a split DV is another common one, but usually you'll get an underboost fault code with that.

[Sparkie90]

Thanks yeh thermostat likely needs doing.   I'll try those other ideas too, thanks