ghohouston
Active member
ive got a bone stock 09 6.4 on the crew of my company i mechanic for. i only have my cheaper scanner with me, that for whatever reason doesnt read fuel rail pressure. anyhow, truck will randomly die, has SUPER extended cranking time, ONLY when at operating temp, and sometimes wont start period, only when at operating temp. starter is healthy, only about 2k miles into a service i did, which included both fuel filters, oil and air. no metal noticed in the filters. truck did at one time have iirc a p2291 code, which showed low icp while cranking, which this being a 6.4, i figured the code correlated to fuel rail pressure. it also had an egr code, but i dont remember the exact code at the moment. anyhow, while i was searching for rail pressure on my scanner, i noticed the sucker had over a 50 degree difference between oil and coolant temps. took it to a podunk ford dealer since its still under warranty (75k miles), told them about the delta difference, truck was there over a week, and all the dude did was pull the cab to replace the oil cooler. i told him all symptoms, and he said he found nothing, and couldnt get the codes to come back after i cleared them. i am beyond knowledgable on 7.3's and 6.0's, but never really got into 6.4's. looking for advice, because im 5 hours away from my scanner that can read rail pressure, hours away from a known reputable dealer, and 5 hours from our company's ford shop. im thinking the hpfp may be going bad, but i havent gotten a po87 or 88 code. Could it be the frp sensor?
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