Rich condition - 2005 Taurus - Page 2 - Taurus Car Club of America : Ford Taurus Forum
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post #11 of 18 (permalink) Old 05-01-2016, 04:23 PM
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Yeah, 15 PSI drop in a few minutes is way too much drop. You see a rather fast bleed off of a few PSI and then the rate should drop to almost nothing. Like, after sitting overnight you'll probably still have 10 or 15PSI at the rail (if things are working right).

One way to test for a leaky injector for sure is to pull the fuel rail out completely, then prime the pump by turning the key to run. A leaking injector will then start to accumulate liquid on the tip. But a strong fuel smell in cylinder 2 on the spark plug is a pretty good indication already.


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Last edited by ice445; 05-01-2016 at 04:27 PM.
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post #12 of 18 (permalink) Old 05-01-2016, 04:34 PM Thread Starter
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That's what I was thinking also. I'm just worried that the high fuel pressure that we seen yesterday is the cause of the leaking fuel injector and that simply replacing the bad fuel injector is just a temporary fix. I don't understand why the fuel pressure didn't/doesn't show 60 psi today like it did yesterday. Maybe it has to be driven again for the fuel pressure to get that high, I don't see why though.
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post #13 of 18 (permalink) Old 05-01-2016, 06:37 PM
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Quote:
Originally Posted by wyteboy314 View Post
That's what I was thinking also. I'm just worried that the high fuel pressure that we seen yesterday is the cause of the leaking fuel injector and that simply replacing the bad fuel injector is just a temporary fix. I don't understand why the fuel pressure didn't/doesn't show 60 psi today like it did yesterday. Maybe it has to be driven again for the fuel pressure to get that high, I don't see why though.
Did you measure it while you were cranking? I've seen a spike in pressure to mid 50's during start, that should be normal


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post #14 of 18 (permalink) Old 05-01-2016, 07:20 PM
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'05 Vulcan or Duratec?
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post #15 of 18 (permalink) Old 05-01-2016, 07:38 PM Thread Starter
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It's a Vulcan.. Motor seems to be from an 06 according to the chalk written on it.

@Ice No, the 60 psi was just from the engine idling.
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post #16 of 18 (permalink) Old 05-01-2016, 07:59 PM
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^+1. 1st, I'd check/replace plug(s), wire(s) and/or coil pack for that p0302. Then, injector(s), compression/leak-down tests.
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post #17 of 18 (permalink) Old 05-01-2016, 11:12 PM
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1/10 psi per second is a fast pressure drop. Swap the suspected bad injector (#2) with another and see if the misfire and wet plug problem moves to that cylinder.
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post #18 of 18 (permalink) Old 05-02-2016, 08:21 AM
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Quote:
Originally Posted by 4 wheel disc brakes View Post
1/10 psi per second is a fast pressure drop. Swap the suspected bad injector (#2) with another and see if the misfire and wet plug problem moves to that cylinder.
A leaking injector will cause a rough idle, like flooded feel on a warm restart after ~10 minutes off situation. The fuel leaks into a hot engine and vaporizes, then that vapor fills the intake plenum causing rich on startup. A fuel pr leak down can be going back to the tank. That would cause a hard to fire on cold startup.

Been there.

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