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Rough running

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Old Mar 5th, 2014, 12:57   #1
pacman67
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Default Rough running

Noticed the last couple of days my xc is a bit rough and lumpy when cold on tickover, once warmed up is ok, and fine on LPG.
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Old Mar 8th, 2014, 23:52   #2
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Quote:
Originally Posted by pacman67 View Post
Noticed the last couple of days my xc is a bit rough and lumpy when cold on tickover, once warmed up is ok, and fine on LPG.
There are many factors that could cause lumpy running when cold on tickover (presumably when running on petrol since you imply a cold start situation). Does it run lumpy until it switches to LPG then run OK? If so, what happens if you switch back to petrol early after it has first switched to LPG? What year XC70?

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Old Mar 9th, 2014, 21:00   #3
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It could well be that when you had the last lot of remapping done that they have set the mixture too rich or lean causing the long term fuel trims to drift.

If you switch back to petrol for a mile or so before switching off does it start and run ok from cold then on petrol?
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Old Mar 12th, 2014, 23:37   #4
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Looks like it was a poor choice of fuel. I used aisling station that I've very rarely visited and used their petrol, that's when the start issues came on. Since the petrol has been used up and I've topped up with shell stuff, she starts fine. There was also times that while cold on petrol she cut out. I checked codes and there was a turbo boost code, I think that was related as it's popped up now and again, possibly due to a weak hose end on.the control solenoid and I've since remade the end off. Also found a slightly perished pipe on one side of the lpg system. A box with a plug on it leading to a tapped point on the inlet manifold?
P's, had no remap etc.
Still getting 320 miles to tank of lpg.
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