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asoo
Date registered: Dec 1899
Location:
Vehicle(s):
| Need help with this
hi all
was driving back from work today and suddenly the truck started jerking and shaking , stopped on the side and tried raising it , but no luck , it was tsill shaking and coughing and eventually it died , waited for a few minutes , started her up , she seemed fine but after a few minutes was the same thing,
any ideas what is causing this ?
no error codes are showing up
the only thing changing drastically on the live data value is the STFT on both banks , becomes around + 25 on both banks
changed plugs recently
changed fuel filter around 6 months back ( although when the mechanic took a look at it , he said the filter needed to be changed, he said it wasnt blowing as freeely , whatever that means )
any help wud be appreciated
thx a lot
ML 430 2000
105,000 miles |
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cmitch
Expert
Date registered: Apr 2006
Location: Ala-Tenn
Vehicle(s): 2002 ML320, 2005 S430 4Matic, 2010 F150 Super Crew
Posts: 3412
| RE: Need help with this
CPS (crank position sensor)? Does it only do it when it's hot? If so, it could also be ignition coils but I doubt 1 coil misfiring would kill a V8. So, when you say no error codes, did you check to see if there were any or are you saying there was no Check Engine Light?
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asoo
Date registered: Dec 1899
Location:
Vehicle(s):
| Re: Need help with this
thx mitch
when this happened the car was at full running temp that is around 90 - 93 C , i hooked up an obd 2 scanner to check , there were no error codes
any other suggestions what this cud be ? |
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cmitch
Expert
Date registered: Apr 2006
Location: Ala-Tenn
Vehicle(s): 2002 ML320, 2005 S430 4Matic, 2010 F150 Super Crew
Posts: 3412
| RE: Need help with this
It could be a fuel pump since fuel starvation doesn't always throw a code. I'd check the fuel pressure on the fuel rail. If it drops to zero after you shut off the engine or wildly fluctuates while it's running, then that would be your culprit.
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asoo
Date registered: Dec 1899
Location:
Vehicle(s):
| Re: Need help with this
how does one check the fuel pressure  |
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asoo
Date registered: Dec 1899
Location:
Vehicle(s):
| Re: Need help with this
and if it were the fuel pump , wudnt this problem be continuous ?
I changed the fuel filter and the Crankshaft sensor today and drove her around for about 5 miles and she seemed back to normal . |
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cmitch
Expert
Date registered: Apr 2006
Location: Ala-Tenn
Vehicle(s): 2002 ML320, 2005 S430 4Matic, 2010 F150 Super Crew
Posts: 3412
| Re: Need help with this
asoo - 6/9/2009 1:55 PM and if it were the fuel pump , wudnt this problem be continuous ? I changed the fuel filter and the Crankshaft sensor today and drove her around for about 5 miles and she seemed back to normal . Fuel pump can cause all kinds of weird symptoms. If the check valve is bad, a hard start when it's cold would most likely be the symptom. But, spitting and sputtering, then dying sounds more like a delivery issue. A fuel pressure gauge can be hooked up to the fuel rail via a valve with a plastic cap on it. Any shop that does tune ups should be able to check fuel pressure.
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asoo
Date registered: Dec 1899
Location:
Vehicle(s):
| Re: Need help with this
Thx for your input mitch
will driver her around for some more days and see if any symptoms re appear and will revert back here
cheers |
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