TrailBlazer 2002-2009
The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
Platform: GMT 305, 360, & 370.

when to replace ignition coils

Old June 23rd, 2019, 8:47 PM
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Default when to replace ignition coils

Hello at what mileage should you replace ignition coils.
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Old June 23rd, 2019, 9:51 PM
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Unless the computer is showing a lot of misfires even after replacing plugs and wires, I wouldn't waste the money on them.

My 5.3l has over 290,000 miles on the original ignition coils. I was chasing what I thought was a misfire issue caused by aging coils so I replaced them all but it made no difference. Turns out, the plugs that only had about 13,000 miles on them were counterfeit! The supposed iridium tips were worn down to nubs. The idle was much smoother after replacing them with genuine plugs but the real problem was a bad torque converter. I swapped the original coils back in and everything is still running great.
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Old June 24th, 2019, 7:33 AM
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There is an old saying. If it ain't broke, don't fix it!
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Old June 24th, 2019, 9:19 AM
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It's not a Ford.
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Old June 24th, 2019, 9:11 PM
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they are not a maintenance item...replace them when they fail.
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