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Discussion Starter #1
Not a huge problem, but recently we've had the occasional difficult start- maybe 6 "chugs" instead of the usual 2- and a smell of unburnt fuel for a bit afterwards. No warning lights and no running problems. On one occasion when it did start it was running very lumpy but was fine when stopped and restarted.
Any thoughts?
 

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Discussion Starter #4
It's not a battery-type problem, I think I recognise those, but it's about 2 years old. New plugs.
This was a morning start, it was a bit colder than our usual, but still above 10C, no problem when warm. I think I know where this is going- temperature sensor, water or air?
 

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Super Moderator Technical Supremo Platinum Member
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I think I know where this is going- temperature sensor, water or air?
Not necessarily but keep coolant temp sensor in mind.

Could be many things though so discount none.
Air filter blocked?
Dirty throttle body?
Fuel line leak?
Leaky Injectors?
Condensation on leads/coils ?
Just a few thoughts, none with any basis apart from possibility.

Anything that may stop it firing and allow unburnt fuel to go through the exhaust (the smell)
 

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Discussion Starter #6
Just another question on this....
If it is a faulty injector, would I expect to find a stored fault on a diagnostic scan, or will it have cleared after a few fault-free starts?
 

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Yes, No, Maybe.
Intermittent faults are a PITA and may show nothing, get lost when ignition off, self clear or show something totally unrelated.
Faulty injector would be either an electrical issue, ie not firing so I would expect something on diagnostics.... may only be a knock sensor though.
Leaky injectors would not necessarily show any fault.
Though far less likely for leaky petrol injectors then diseasal ones AFAIK.

As a thought, have you checked and cleaned the TDC sensor ?
 

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Super fantastic Mod Technical Supremo Nice Guy
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If its petrol, you are really hoping..
Unless it fails, very rarely ,.
Could be sticking, these do gum up.

Petrol injectors are a nightmare, easy when they fail,
 

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Discussion Starter #9
As a thought, have you checked and cleaned the TDC sensor ?
Replaced in January after an AA rescue- the old one looked like a pencil point. When that failed the starter would try for about 10 seconds before giving up- not like this fault at all.
Would anyone advocate precautionary replacement of the injectors, or coils? We're on about 138,000 miles.
 

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Super fantastic Mod Technical Supremo Nice Guy
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NOPE,

Try a decent injector cleaner first, see if any improvement

Does yours have a cam sensor fitted, any chance its got a film of old engine oil on it. dried up and crusted
And the tip just wants a cleaning
 
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