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1997 Chev Tahoe 5.7 random misfire
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boot
Novice
Dec 10, 2012, 4:07 PM
Post #1 of 12
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1997 Chev Tahoe 5.7 random misfire
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I have a 97 chev tahoe, 5.7. Have had a random mis-fire. Changed-plugs,wires,cap and rotor, ignition control module, crank positioning sensor. Seems to be running rich. Wondering what else it could be caused by?
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 10, 2012, 4:28 PM
Post #2 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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have the PCM code read and post the numbers here.
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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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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 10, 2012, 5:56 PM
Post #3 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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You also might need to take it to a shop that has a scan tool that can get on the manufacture's side to see the misfire current and history PIDs. Maybe knowing which cylinders are misfiring can give you or them some direction.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Sidom
Veteran
/ Moderator
Dec 10, 2012, 8:12 PM
Post #4 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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know when the miss is happening would also be helpful. Just at idle & slow speeds, Just at cruise, all the time?
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boot
Novice
Dec 11, 2012, 6:05 PM
Post #5 of 12
(3549 views)
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Re: 1997 Chev Tahoe 5.7 random misfire
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Do you think it could be a bad O2 sensor not throwing a code? Will run the code tomorrow and post it
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boot
Novice
Dec 11, 2012, 6:07 PM
Post #6 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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If I remember right 3 and 5 were wet
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 11, 2012, 6:10 PM
Post #7 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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In that case I also suggest that you take a fuel pressure reading and pay close attention to what the pressure does when shut off.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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boot
Novice
Dec 11, 2012, 6:29 PM
Post #8 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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Ok will do but going on vacation next week for 2 weeks tahoe will be in my garage but will post the reply when i can thanks for the help
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boot
Novice
Dec 13, 2012, 5:47 AM
Post #9 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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Hammer time,
Code is p 0300 random multiple mis fire
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 13, 2012, 5:49 AM
Post #10 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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And what did the fuel pressure do?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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boot
Novice
Dec 13, 2012, 7:51 AM
Post #11 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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My tester wasnt working properly - it was leaking off the fitting on the gauge )on the O ring) .. do you think changing the distributor would help?
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 13, 2012, 8:27 AM
Post #12 of 12
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Re: 1997 Chev Tahoe 5.7 random misfire
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No, it's not going to help your fuel pressure gauge.
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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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