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93 suburban running like crap
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shane93burb
Novice
Nov 14, 2009, 5:51 PM
Post #1 of 13
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93 suburban running like crap
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1993 chevy suburban
2500 4x4 7.4 454
I was driving it and all of a sudden it started running like it was out of time long story short i changed distibuter, cap and rotor,wires, plugs, coil...still nothing!!!! it will start and run(like crap) for a minute and then just die....the codes it is giving me are 42 and 43 anybody have a clue what to check next?
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 14, 2009, 6:12 PM
Post #2 of 13
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Re: 93 suburban running like crap
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One of those codes is for the ignition circuit and one is for the knock sensor circuit. They are both somewhat related. The knock sensor tells the computer when to retard the timing and the ignition module does it.
You could have a problem with any of the 3 of those components setting both codes. I would start with checking out the knock sensor.
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(This post was edited by Hammer Time on Nov 15, 2009, 11:15 AM)
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re-tired
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Nov 15, 2009, 9:35 AM
Post #3 of 13
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Re: 93 suburban running like crap
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LIFE'S SHORT GO FISH
(This post was edited by re-tired on Nov 16, 2009, 9:45 PM)
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shane93burb
Novice
Nov 15, 2009, 4:21 PM
Post #4 of 13
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Re: 93 suburban running like crap
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There are no wires going to the knock sensors....any chance you know what color wire goes to them? I cant find the knock sensor on my wireing diagrams
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Hammer Time
Ultimate Carjunky
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Nov 15, 2009, 4:26 PM
Post #5 of 13
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Re: 93 suburban running like crap
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The knock sensor is in the right side of the block, right in front of the starter. It's a single Dark blue wire.
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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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shane93burb
Novice
Nov 15, 2009, 6:16 PM
Post #6 of 13
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Re: 93 suburban running like crap
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is it possible the truck can run fine without the wire hooked to the knock sensor? I have searched for the harness and or wire all over and cannot find one....if so what else can i look for
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Hammer Time
Ultimate Carjunky
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Nov 15, 2009, 6:25 PM
Post #7 of 13
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Re: 93 suburban running like crap
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It was there when they built the truck
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shane93burb
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Nov 15, 2009, 6:29 PM
Post #8 of 13
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Re: 93 suburban running like crap
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does it trace right back to the ecm?
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Hammer Time
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Nov 15, 2009, 6:39 PM
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Re: 93 suburban running like crap
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If you have the 4L60-E transmission, it's at pin B15 of the ECM
If you have the 4L80E transmission, it at pin D5 of the ECM
On a manual trans, it's not showing me
Have you found the sensor itself?
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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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shane93burb
Novice
Nov 15, 2009, 6:41 PM
Post #10 of 13
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Re: 93 suburban running like crap
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What i am saying is that The knock sensor doesnt have a wire hooked to it and I don't know how it would just fall off and not just be dangling there...so i would like to know where to trace it from so if need be I can run a new wire. I appreciate any further advice
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shane93burb
Novice
Nov 15, 2009, 6:44 PM
Post #11 of 13
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Re: 93 suburban running like crap
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yes i have
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shane93burb
Novice
Nov 15, 2009, 6:52 PM
Post #12 of 13
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Re: 93 suburban running like crap
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another dumb question...how do i figure out what transmission i have?
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Hammer Time
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Nov 15, 2009, 7:03 PM
Post #13 of 13
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Re: 93 suburban running like crap
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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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