Got it, my mistake.
07 Suburban rough idle P0304 code afm delete
- Thread starter smokymtn65
- Start date
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smokymtn65
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@swathdiver
I have not done anything with Tech2. I leave at 6;30 get home @ 5 M-F Do some mowing on the side and startied powder coating on the side. I need to find something else to do LOL
The Melling was the M365 I believe . but i will verify.
I have not done anything with Tech2. I leave at 6;30 get home @ 5 M-F Do some mowing on the side and startied powder coating on the side. I need to find something else to do LOL
The Melling was the M365 I believe . but i will verify.
If you smell gas at shutoff it would be wise to investigate the source. It could be something other than the canister vent valve opening up.
You can test the purge valve by performing an evap purge & seal test, which forces the vent valve closed, theoretically closing the system, and opens the purge valve to apply engine vacuum to the system. When the "seal" part of the test is activated, the system is closed. The decay of the applied vacuum is monitored using the fuel tank pressure; the slower decay the better, indicating that the purge and evap valves and the evap lines are sealed.
Eric O at the South Main Auto YouTube channel has several videos on evap systems, specifically on testing the purge valve. But it's only part of the evap system.
EDIT: or the Wells site:
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smokymtn65
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@Fless Good vid, Thanks
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smokymtn65
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Just checked with tuner/mechanic, and he said he ran an evap purge test on it and it tested good.
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smokymtn65
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Ordered a new obd2 adapter so we will see if that helps.
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smokymtn65
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So decided to try something, at the time of the "normal" hot long crank. Held pedal to floor to shut off fuel then turned key to start, it stubles some but starts quicker ecah time. Injectors? Or may something in tune still?
If you are smelling gas after shutdown and a flood clear helps with the hot starts, it certainly would support the notion that something is allowing fuel to get into the intake and flooding it after shutdown.
If you have a fuel pressure gauge, maybe hook it to the Schader valve, run the engine and then after shutdown and if the rail is keeping pressure. If it bleeds off quickly, it could be a leaky injector.
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smokymtn65
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Update on this. New tuner and problem resolved, shout out to RM Motorwerks in Knoxville.
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smokymtn65
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Well feel good didn't last long, truck died pulling out of parking, just like you turned key off. Not a rattle,bag,thud,nothing. Hit the key it spins over like a starter with stuck bendix. However the engine is spinning over. No compression on 1,2,4 didn't check others. Pulled front down it is in time. This is a first for me. How can you loose compression all at once silently? Would love input, from everyone. I will be pulling it i suppose and going through it. It.is our primary family ride.
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smokymtn65
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Pin Shear in cam, just going to pull this one and freshen it up..
Sorry I missed your earlier post. This is the only thing I could think of that would do what you're describing all at once. I wonder how it sheared. Did the cam sprocket bolts back out?
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smokymtn65
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No its a single bolt cam. And was fully torqued still , 3ft cheater to loosen. I suspect a lifter failed and rotated maybe and shock loaded cam for lack of better description. I haven't pulled heads yet but will post the root cause if found.
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smokymtn65
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Well an update for this one, failed lifter on intake 4, jamed cam to shear pin and take out all exhaust valves and ex push rods. 220k almost no wear in cylinders, a hone, new pistons, cam , the works. Maybe by labor day.. lol
Check those lifter bores real close. If it jammed up enough to shear the cam pin, there could be other damage in there
OklabyGodhoma
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I've read the whole thread and didn't see anywhere it was mentioned that the fuel filter was changed. I had a similar problem with my '07 Yukon 5.3 with hard start or 2 cranks to start and fuel smell from time to time. Chased it for a while and finally changed the fuel filter. Fuel smell went away almost immediately. I did not have any tune done nor do I have the advantage of the electronics test equip. Sometimes it's the basics that sneak up on us for what it's worth. Good luck!
There is no fuel filter on these trucks from the factory besides the one in the fuel tank as an integral part of the fuel pump. Is that the one that you mean?
OklabyGodhoma
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ok
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smokymtn65
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It is a bit rough right around the bottom of the failed one, it has been polished out. Fortunately not to bad
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smokymtn65
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My hard start was most definitely cause by a bad tune. Till lifter failed anyway. Lol
