Truck dies when coming to a stop, parking, or moving slow
08-14-2018, 03:19 PM
#61
Senior Member
When you were spraying if you didn't have it hooked to a scanner that shows live data you are wasting your time because the computer will adjust too quick. If you spray,( and I know you're not supposed to), have it hooked to a scanner that can display live fuel trims and when the fuel trims go crazy you've found your vacuum leak. I would start with the intake gasket.
08-14-2018, 03:41 PM
#62
Senior Member
He was listening for idle deflection which is an old trick that doesn't work well unless you have a gross leak. If the leak was that bad you can find it with your fingers feeling around the PVC back by the firewall or around battery/firewall if it's emissions (mini-tube)
Best way to realize a leak is warm idle. These engine idle smooth between 725-730 rpms when all is well. Ford has it 700-750 rpms before suspecting a leak. Those margins have proved a little wide from what I've seen across forums over the years.
Generally, it's always a PCV leak. When the intake gaskets compromise, it's always at the front water jackets. Mini tube emission harness leaks are always over by the battery, between that and firewall in plain view. They get brittle there and shatter...break apart.
Granted they can leak elsewhere, but it isn't very common and monitoring trims would be telling as you suggest. Hosing the lines down with chemical that eats them up is defeating lol.
Best way to realize a leak is warm idle. These engine idle smooth between 725-730 rpms when all is well. Ford has it 700-750 rpms before suspecting a leak. Those margins have proved a little wide from what I've seen across forums over the years.
Generally, it's always a PCV leak. When the intake gaskets compromise, it's always at the front water jackets. Mini tube emission harness leaks are always over by the battery, between that and firewall in plain view. They get brittle there and shatter...break apart.
Granted they can leak elsewhere, but it isn't very common and monitoring trims would be telling as you suggest. Hosing the lines down with chemical that eats them up is defeating lol.
Last edited by Jbrew; 08-14-2018 at 03:47 PM.
08-14-2018, 10:18 PM
#63
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I pulled the pvc hose last night to look at it and the plastic tube looks in great condition, all other hoses look fine, not exactly sure how to check the intake gasket, i used a stethescope but have no damn clue how your supposed to use it to find a leak all i heard was regular motor sound, just not sure why bank 1's fuel trim is.so damn high lol
08-15-2018, 08:17 AM
#64
Senior Member
Check it like I told you to with a scanner and a little brake clean spray. You don't have to spray everything on the engine.
08-15-2018, 12:49 PM
#65
Senior Member
Guess we know what's wrong with bank one, why did you start another thread ? Don't understand your thinking lol.
08-15-2018, 12:54 PM
#66
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08-15-2018, 01:19 PM
#67
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Gotcha. I think you better take it in....or lease a new one every other.