popping noise
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Joined: Nov 2015
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popping noise
I have a 98 auto. just did 243 heads ls6 intake lunati cam 222l228 vararam. the car runs great except for one issue. If i`m cruising along say 45 and I accelerate hard it will downshift and start going pop pop pop. there are no other symptoms. Any ideas on a cause?
Melting Slicks
Joined: Sep 2007
Posts: 2,138
Likes: 139
From: Port St Lucie Florida
You have to be more specific is the popping in the engine or out of the exhaust? Where does it sound coming from.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Where did the tune come from?
If you are very lean or there are other issues with the tune, you could fry #7 so I would not drive it under the conditions it happens until you sort it out.
If you are very lean or there are other issues with the tune, you could fry #7 so I would not drive it under the conditions it happens until you sort it out.
Last edited by vettenuts; Apr 13, 2016 at 08:42 AM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
LOL!! I had the EXACT SAME issue right after headers were installed on my 02 ZO6.
I knew EXACTLY what it was as soon as I experienced the issue. It only happened when the engine was under heavy LOAD. Check for this:
I knew EXACTLY what it was as soon as I experienced the issue. It only happened when the engine was under heavy LOAD. Check for this:
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I forgot to say,,,,, It sounds exactly you are having a MISFIRE Situation and a cracked PLUG is just one cause of the issue. Could be A LOOSE OR DAMAGED PLUG WIRE OR A BAD COIL ect ect..
When the popping noise is happening, see if you have a flashing Check Engine Light (CEL)
After it happens, If you check the DTCs (BEFORE YOU TURN OFF THE IGNITION) you will most likely have a P-0300 misfire DTC.
Bill
When the popping noise is happening, see if you have a flashing Check Engine Light (CEL)
After it happens, If you check the DTCs (BEFORE YOU TURN OFF THE IGNITION) you will most likely have a P-0300 misfire DTC.
Bill
Last edited by Bill Curlee; Apr 13, 2016 at 02:55 PM.
Melting Slicks
Joined: Sep 2007
Posts: 2,138
Likes: 139
From: Port St Lucie Florida
^^^^^^ I agree.
I had posted something similar a few days ago, while the engine temp around 205-215 degrees, it would pop, and after checking plug wires and plugs, the passenger side plug was loose and not tight, after retightening it no more pops thru exhaust. And my motor is Forced Induction.
I had posted something similar a few days ago, while the engine temp around 205-215 degrees, it would pop, and after checking plug wires and plugs, the passenger side plug was loose and not tight, after retightening it no more pops thru exhaust. And my motor is Forced Induction.
Last edited by corvet786c; Apr 13, 2016 at 02:13 PM.
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Joined: Nov 2015
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I like to work on my car but I am no mechanic. I just finished putting in ac delco iridium gapped at 40. the old plugs were autolites gapped at 60. one may be cracked. if it is it`s very small. but checking the wires that I put on at least 2 of the coil wires seemed loose and one plug wire I`m going to drive it now and hope for the best
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Melting Slicks
Joined: Sep 2007
Posts: 2,138
Likes: 139
From: Port St Lucie Florida
I like to work on my car but I am no mechanic. I just finished putting in ac delco iridium gapped at 40. the old plugs were autolites gapped at 60. one may be cracked. if it is it`s very small. but checking the wires that I put on at least 2 of the coil wires seemed loose and one plug wire I`m going to drive it now and hope for the best
