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Username Post: Popping thru exhaust        (Topic#356326)
Posts: 3

Age: 50
Loc: Michigan
Reg: 03-13-18
05-07-19 04:02 PM - Post#2765905    

Hello, thanks in advance for advice. I live in Michigan so !st fire up of the year was just last week. I' getting an inconsistant loud pop out of my drivers side exhaust during high idle, especially when cold. I replaced plug wires,still have it. Replaced plugs with same as what came out last year, no problems last year. A mechanic friend said maybe a plug firing late. So I replaced each left side plug one at a time and started it between plugs and still have the popping. 454 cid,hei. Any ideas


Member #271 Senior Chevytalk Moderator
Posts: 25178
Loc: Austin, TX 78748
Reg: 05-09-00
05-08-19 04:05 AM - Post#2765925    
    In response to Mdgolf66

Turn it on at night. Or when there is less light. Check for arching. It can be a non firing plug with unburned fuel igniting in the exhaust pipe. Check that each wire is firing. You can use a timing gun to check each wire.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE

Frequent Contributor
Posts: 2081

Loc: Lake George, NY
Reg: 11-11-15
05-08-19 06:45 AM - Post#2765936    
    In response to gchemist

Lean mixture or vacuum leak are the most common causes assuming the engine is up to par mechanically.

Super Senior Member
Posts: 5630

Loc: paradise
Reg: 09-05-03
05-08-19 09:49 PM - Post#2765985    
    In response to Mdgolf66

might try a cold compression test

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.

"9th Year" Silver Supporting Member
Posts: 1652
Age: 72
Loc: Las Vegas, NV
Reg: 10-26-04
05-10-19 11:49 AM - Post#2766112    
    In response to bobb

Might even be a sticking exhaust valve.


57 210 4dr. Wagon(bought '82)
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"4th Year" Gold Supporting Member
Posts: 727
Reg: 08-07-08
05-13-19 06:46 AM - Post#2766273    
    In response to WagonMan

Look at each spark plug and see if you can see one that's not firing. If so inspect the plug wire closely. Sometimes the plug wires can fail internally.


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