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S70 T5 running rough, im STUMPED

posted by  yellowtail on  Thu Jul 9 14:28 CST 2009
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last visit: Wed Oct 24 13:34 CST 2012
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My 1998 S70 T5 is running very rough (190k miles). Here are the symptoms

Engine codes- multiple cylinder misfires (only codes thrown)


The engine runs fine until it reaches operating temperature. Then it shudders and will not accelerate under load and basically wants to die. I can get up to maybe 40mph very, very slowly (it takes about a mile of distance to accelerate to that speed). Pushing the accelerator makes it run much rougher, so I feather the throttle (had to do that to get home). Even at idle it runs rough, kind of like there is water in the fuel. But I dont think its that because it runs nicely until it gets warm.

I checked the coil (swapped it) and its not the problem.

Any ideas? Fuel related or ignition? Fuel pressure regulator? Could it be the fuel pump or fuel pump RELAY?

HELP!

ANY help would be greatly appreciated!

Thanks,
yt






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New S70 T5 running rough, im STUMPED
posted by  yellowtail  on Thu Jul 9 14:28 CST 2009 >


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