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Username Post: Popping thru exhaust        (Topic#356326)
Mdgolf66 
Poster
Posts: 3

Age: 49
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



 


gchemist 
Senior Chevytalk Moderator
Posts: 24852
gchemist
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


 
Shepherd 
Frequent Contributor
Posts: 1789

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.



 
bobb 
Super Senior Member
Posts: 5447
bobb
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.


 
WagonMan 
"8th Year" Silver Supporting Member
Posts: 1640
WagonMan
Age: 71
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.

Charles

57 210 4dr. Wagon(bought '82)
-350/700r4 Mild Custom
56 BA 4dr. ht.(bought '98)
-265/TH350 Mostly Stock
29 Ford Sedan(bought '75)
-4.3L/TH350(in progress)


 
corvesy 
"4th Year" Gold Supporting Member
Posts: 681
corvesy
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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