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2nd Generation
Fuel pressure jumping under load... help please
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<blockquote data-quote="Fade 2 Black" data-source="post: 8524259" data-attributes="member: 1808"><p>Retrace your steps, what have you recently done (if anything) that could cause this? Have you had the truck all apart or anything? Can you log/check the TPS throughout it's range? For some reason I'm thinking the PCM isn't staying in open loop mode while it should and it's commanded off of TPS and load (airflow). Could also be a bad ground somewhere. You could try jumpering the fuel pump relay inside the backup power box under the hood so the pumps run full speed full time and see how it does under WOT, although it will most likely be pig rich at idle so I wouldn't run it too long that way.</p></blockquote><p></p>
[QUOTE="Fade 2 Black, post: 8524259, member: 1808"] Retrace your steps, what have you recently done (if anything) that could cause this? Have you had the truck all apart or anything? Can you log/check the TPS throughout it's range? For some reason I'm thinking the PCM isn't staying in open loop mode while it should and it's commanded off of TPS and load (airflow). Could also be a bad ground somewhere. You could try jumpering the fuel pump relay inside the backup power box under the hood so the pumps run full speed full time and see how it does under WOT, although it will most likely be pig rich at idle so I wouldn't run it too long that way. [/QUOTE]
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Fuel pressure jumping under load... help please
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