larrycase

Hello all I have a 1999 suburban with the 7.4L it has set all summer I started it about two weeks ago and put plow on ran ok. Today it did not won't to start as it cranked over it would turn over four or five times then pop and stop cranking like to much pressure. let off key and it will crank again. finally it started ran for maybe ten minutes but kept lunging and very rough then at ideal it was lunging and died now wont start. I checked fuel pressure at fuel rail 61psi. sounds like out of time or something when cranking over. I could really use any help I just flat cannot afford to take it in. there is no check engine light on but will scan for codes in little while just waiting for a guy to stop and let me use his scanner.

larrycase

scanned it No codes.

larrycase

Weird I just went out tried to read it with scanner again still said no codes I hit erase and confirmed it and then tried starting it and it fired right up ran perfect let it run for 15 minutes or so and shut it off started right back up. now I'm real confused lol.

73shark

Welcome to the forum.

Keep us informed as to how long term the "erase codes" fix works.

larrycase

so far so good still starting good runs perfect now if I could just fix the P-0300 on my 96 blazer I have checked for vacuum leeks found one replaced hose. sprayed around intake with carb cleaner looking for leek none found. plugs,wires,cap,rotor and air cleaner where replaced less then 6000 miles ago. new mass air flow sensor last week. seems to through the p-0300 code when cold at ideal after warmed up it only once in a great while any advice what else to check would be greatly appreciated.