Author Topic: 159 2.2 JTS not starting first time.  (Read 1379 times)

0 Members and 1 Guest are viewing this topic.

Colin Edwards

  • Hero Member
  • *****
  • Posts: 654
  • AROCA Member #: 5065
Re: 159 2.2 JTS not starting first time.
« Reply #15 on: January 29, 2021, 09:25:37 AM »
Given the mist from a direct injection engine like the JTS does not condense on cold surfaces like the inlet tract and inlet valve, its fair to assume the mixture during a cold start will be leaner than that of a port injection engine.  Happy to be corrected! 
The mixture in the combustion chamber at the moment of an ignition event could be leaner or of the incorrect shape if the injectors are iffy.

Could it be possible the ECU does not know the engine needs a slightly richer micture due to the coolant temperature?  Is the temperature sensor iffy?  Does the JTS use a temperature sensor specific to "cold" starting?

A new set of injectors could be pricey!
2020 Giulietta Veloce
2018 Abarth 124 Spider
1987 75 3.0

2015 Giulietta QV
2009 159 3.2 Ti Q4
2012 Giulietta TCT Veloce
2006 147 Ti 2 door Selespeed
1979 Alfasud Ti 1.5


  • Jr. Member
  • **
  • Posts: 44
Re: 159 2.2 JTS not starting first time.
« Reply #16 on: February 23, 2021, 10:21:17 AM »
I chucked in the Nulon Pro Strength Petrol System Clean a couple of weeks ago and it didn't anything at first. It could be a coincidence but I put the Nulon Extreme Stress Engine Oil in recently and it seems to have solved the cold start issue or at least helped with it. It could have been because its hot as well but it started a few times first time after the car was sitting for a couple of days which it usually didn't before.
159 Q4

Previous 2x GTs