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Old 12-29-2010, 06:39 PM
ShayneO ShayneO is offline
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Bad Injector Symptoms???

what are the symptoms of a bad injector or fuel problem??pretty new filter,just blew it out with compressor.blew out the fuel lines, not sure if the regulator is bad or if its just injectors..it misses once and a while when i drive sometimes it will do it somtimes it wont i dont have any open wires or vaccum lines everythings in good shape. brand new wires..soo??
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Old 12-29-2010, 07:01 PM
xlt4wd90 xlt4wd90 is offline
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Bad injectors can cause mis-fires (clogged or not opening properly) or flooding (stuck open). I once jammed up one of my injectors so badly that its cylinder did not fire at all. I ended up pulling them all out and reverse-flushing them with injector cleaner spray. Did you try running some cleaner through the gas tank?
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Old 12-30-2010, 10:04 AM
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what vehicle is this happening to and what year?

pull codes, check fuel pressure. may need a tune up?
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Old 01-03-2011, 05:46 PM
ShayneO ShayneO is offline
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its a 1990 f150 with a 5.0. it hasnt been doing it lately but once and a while it would miss like it wasnt getting enough gas
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Old 01-04-2011, 07:46 AM
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timbersteel timbersteel is offline
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X2 what Kemicalburns advised.

Get a fuel pressure gauge on the rail, and see if in fact it's delivering (X) amount of fuel without any hesistation. Mine did the same and it was the fuel pump.
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Old 01-04-2011, 05:57 PM
xlt4wd90 xlt4wd90 is offline
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The engine will require more fuel while under load, so you can get a better idea of fuel pump performance if you can monitor the pressure under load, like WOT going up a steep hill.
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Old 01-04-2011, 05:57 PM
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Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)

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