L5P will barely start, then die Please Help

Ron Nielson

Active member
Oct 11, 2009
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Berryton, KS
The high pressure can be explained if the mm3 is also high during idle
Post 19, idle at 600, very low, 13K desired and actual furnished by the CP3. Are you saying that the ECM has upped the demand pressure because the idle needs to be raised to 700/750? Ignore this as being the cause of the engine running poorly?
 

2004LB7

Well-known member
Dec 15, 2010
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Norcal
Post 19, idle at 600, very low, 13K desired and actual furnished by the CP3. Are you saying that the ECM has upped the demand pressure because the idle needs to be raised to 700/750? Ignore this as being the cause of the engine running poorly?
If the idle is not getting to were the ECM wants, or it's having to inject more fuel to maintain it, then the ECM will also raise fuel pressure. If you look over the fuel pressure maps, you'll see the pressure increase at higher mm3 even for the same RPM