XK8 4.2 starting difficulty when cold
#1
XK8 4.2 starting difficulty when cold
Hi. my 2002 XK8, first of the 4.2 model, has difficulty in starting when its cold. It turns over fine, but fire up until the second or third attempt. It wasn,t used for a most of this year. Once its warm, their is no problem at all. just when it cools down again. Any ideas would be greatly appreciated.
#2
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ajagger (11-14-2016)
#4
The standard answer is to check the battery. Here in the US, stores that sell batteries typically offer to load-test an old battery for free, in the off chance you need a replacement. The problem with an old battery is that under the load of a starter, the voltage may drop below what is acceptable to run the electronics (maybe 10V). Once past a certain point, no amount of recharging does the trick, and the battery needs to be replaced. The confusing part is that the old battery at that point seems to still be plenty capable of cranking, but in reality drops the voltage too much to be effective.
I am sure there are plenty of other reasons to have difficulties cranking, but this is a start.
Best of luck, keep us posted.
I am sure there are plenty of other reasons to have difficulties cranking, but this is a start.
Best of luck, keep us posted.
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ajagger (11-14-2016)
#7
A jagger, no offense but what do you base seems fine on ? You really need to get it checked to be able to affirm status.
Don't feel like it ? Hook up battery charger, how many amps is it feeding ? When shows full, try a start with charger hooked up, did it make a difference like fmertz suspectso?
John
Don't feel like it ? Hook up battery charger, how many amps is it feeding ? When shows full, try a start with charger hooked up, did it make a difference like fmertz suspectso?
John
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ajagger (11-15-2016)
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#8
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ajagger (11-15-2016)
#12
If you suspect a fuel delivery problem, the fuel pressure value is available over standard OBD. A cheap ELM327-based diagnostic tool would show you the value "real time". Mine shows a pretty constant 55 psi, as I believe the sensor takes its value with a reference to the intake manifold already.
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ajagger (11-15-2016)
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