Injectors?
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Freshman User
Joined: Aug 2008
Posts: 46
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From: augusta, ga.
Injectors?
About 5 weeks ago i thought i was noticing a slight miss. Changed the Ficm board and harness. 2 weeks ago i went on a fishing trip t pulling my bass boat, and my truck started missing noticably when running 55-62ish. Babied it for the week and limped it home. Got home and replaced both fuel filters, fuel pump, o-rings and blue spring in the regulator. Still missing. Run the buzz test on AE, #7 fails when cold but not hot. Having problems with the AE turning off the cylinders, working with them to try and fix it. I did manage to shut off six of them, but could not shut off 2 & 8. Today, I installed a fuel pressure gauge and the pressure runs 75+ and at WOT uphill only dropped to 70psi. With 212k miles, I am thinking it might be time to just go ahead and replace the injectors. Does anyone have any insight on what it might be besides injectors?
Appreciate the help, thankful for this site.
Appreciate the help, thankful for this site.
Last edited by huntinfishn; Apr 11, 2021 at 03:43 PM. Reason: Timeframe was wrong
Thread Starter
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Freshman User
Joined: Aug 2008
Posts: 46
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From: augusta, ga.
Tech smart, just the board.
Bismic, i went back and edited the timeframe, i was noticing a slight miss before changing the Ficm board, it got worse on the trip. Sorry for the confusion.
Bismic, i went back and edited the timeframe, i was noticing a slight miss before changing the Ficm board, it got worse on the trip. Sorry for the confusion.
Fleet Mechanic
Joined: May 2010
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From: West by God Virginyuh
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Freshman User
Joined: Aug 2008
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From: augusta, ga.
Racor with blue spring, does it seem high? The gauge is a new glowshift. At idle it sets at 78.
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Joined: Dec 2012
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From: Warsaw KY
I have the stock fuel system and blue spring also and runs 72- 75 at idle. I know it's higher than what I see folks report here. I also have the glow shift gauge and now I wonder if it reports correctly.
Fleet Mechanic
Joined: May 2010
Posts: 1,480
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From: West by God Virginyuh
Man, mine is at 60-62 at idle and drops to 45 at wide open throttle. I have the maxtow gauge, which I think is also glowshift
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Freshman User
Joined: Aug 2008
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From: augusta, ga.
Could the logic board cause an injector to go bad? I just replaced all eight injectors, ran fine idling for about an hour. I went to drive it, and it started stumbling. Checked the codes and got a 7 contribution code. Sure enough, it failed the buzz test. Swapped the harness connectors around and number 7 plug will buzz number five injector. Number 5 plug would not buzz number 7 injector. Wondering if the logic board or power board could kill an injector that quick or did i just get a bad injector.
Fleet Owner
Joined: Nov 2003
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The way I read it (after a couple of re-reads, lol):
#5 connector buzzes #5 injector
#7 connector does not buzz #7 injector
#7 connector buzzes #5 injector
#5 connector does not buzz #7 injector
#5 connector buzzes #5 injector
#7 connector does not buzz #7 injector
#7 connector buzzes #5 injector
#5 connector does not buzz #7 injector
Last edited by bismic; Apr 17, 2021 at 04:25 PM.