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ghostryder
New User
Oct 31, 2011, 2:23 PM
Post #1 of 8
(2220 views)
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MISS JUST OFF IDLE
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1998 GMC SIERRA 1/2 TON 4.3L 127618 MILES. MISS JUST OFF IDLE, HAVE ALREADY RAN COMPRESSION, REPLACED PLUGS, WIRES, ROTOR, CAP,MAP SENSOR,MASS SENSOR, FUEL PRESSURE REGULATOR,INSTALLED FUEL PRESSURE GAUGE AND CHECKED PRESSURE. TURN SWITCH ON READING IS 60, PUMP STOPS GAUGE DROPS TO AROUND 55 AND HOLDS. WOULD APPRECIATE SOME INPUT ON THIS. THANKS. WORKED AS GENERAL MOTORS TECH IN LIGHT AND HEAVY LINE,REARENDS AND TRANSMISSIONS. NEVER WAS TO UP ON DRIVEABILITY AND COMPUTER DIAGNOSTICS.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 31, 2011, 3:12 PM
Post #2 of 8
(2191 views)
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Re: MISS JUST OFF IDLE
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Have you tried getting the injectors pressure cleaned?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
Veteran
/ Moderator
Oct 31, 2011, 4:39 PM
Post #3 of 8
(2185 views)
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Re: MISS JUST OFF IDLE
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In addition to the injector service, I would suggest getting the codes pulled to see if you can narrow done the problem cyls, If just a P0300 pops up you many need to find one that can look a the miss history...
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 31, 2011, 5:20 PM
Post #4 of 8
(2173 views)
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Re: MISS JUST OFF IDLE
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Probably would be easier to do the poppet valve conversion instead of wasting your time cleaning a crappy poppet valve injector unit.
If your lower intake gaskets are leaking, which most do because the gaskets turn to puddy, you might want to reseal the lower intake if you do the injector.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Oct 31, 2011, 5:21 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 31, 2011, 5:43 PM
Post #6 of 8
(2160 views)
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Re: MISS JUST OFF IDLE
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No, it had this from the factory:
Poppet style injector unit with all six injectors in the housing. As you know the poppet balls were prone to sticking from the carbon and EGR discharge causing no starts and misfires.
The conversion is this:
Injectors relocated to the ends of the tubes and poppet nozzles eliminated. Injector hats keep the tips from clogging. No worries.
They both are sequential firing. The newer style injector wasn't seen in those trucks from the factory until after 2003.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Oct 31, 2011, 5:55 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 31, 2011, 6:05 PM
Post #7 of 8
(2151 views)
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Re: MISS JUST OFF IDLE
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Hey, anyone want a candy bar? I got a couple left over from the trick er treat bowl. <Looks in screen> Do I have any chocolate on my face?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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ghostryder
New User
Nov 4, 2011, 11:42 AM
Post #8 of 8
(2117 views)
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Re: MISS JUST OFF IDLE
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checked fire on cylinders. When brought up off idle pretty good number 3 and 4 cylinders quite firing.
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