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Do you have access to a scanner? If so, look at the IPR duty cycle % and ICP while cranking. Look to see if the delay is the same time period it takes to get to 500 psi. If the delay is related, you have a list of possible issues. You could have a bad pump, ipr, icp, any leak anywhere in the high pressure side from the lines to injector o-rings.
The 1st thing I would do because it's the most common is to replace the IPR o-rings.
Bob
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