Misfire under load

Billbob10 · Post by **Billbob10** » Sun Apr 25, 2021 6:57 pm

Hi all , i have developed a misfire under load ,new plugs were installed recently .any ideas. Someone suggested coil packs could be the problem. Any advice welcome Ta

Ewazix · Post by **Ewazix** » Sun Apr 25, 2021 10:47 pm

Any fault lights, or fault codes with a reader?

New plugs have been known to be faulty, worth looking for cracked ceramics or one that is a different colour indicating the cylinder involved.

But coil pack(s) was the obvious shout. You can change them all if they are original and you feel flush as people say once one goes they all start going, but I'd buy one and swap it around. If you do this the pack MUST be genuine OEM if the rest are, or the same brand/rating as installed. Otherwise you risk introducing differences in firing quality between cylinders/rough running. Let us know how it goes

Billbob10 · Post by **Billbob10** » Sun Apr 25, 2021 10:51 pm

Many thanks for that I may change them all , i was thinking they may be the originals

colb · Post by **colb** » Sun Apr 25, 2021 11:17 pm

Code read it to see which cylinder(s) are misfiring, then swap the offending ones with good ones and see if the misfire moves to the new cylinder, if the misfire follows then replace the coil.

Billbob10 · Post by **Billbob10** » Sun Apr 25, 2021 11:26 pm

Cheers I have a mate with a code reader . Will give him a shout

Haggisman · Post by **Haggisman** » Mon Apr 26, 2021 7:23 am

Billbob10 wrote: ↑Sun Apr 25, 2021 10:51 pm Many thanks for that I may change them all , i was thinking they may be the originals

I put new plugs in and one coil pack went, then another so as they were original I just changed them all and kept a couple as spares. Good preventative maintenance.

Billbob10 · Post by **Billbob10** » Mon Apr 26, 2021 11:25 pm

Many thanks everyone. Coil pack on number 5 buggered. Replacements on the way. Cheers

colb · Post by **colb** » Tue Apr 27, 2021 10:09 am

No doubt code reader probably pinpointed the duff one, be worth buying two and keeping a spare in the boot given that many experience these failing one at a time, suppose its an age related problem with them breaking down due to age.

Ewazix · Post by **Ewazix** » Wed Apr 28, 2021 7:46 am

colb wrote: ↑Tue Apr 27, 2021 10:09 am No doubt code reader probably pinpointed the duff one, be worth buying two and keeping a spare in the boot given that many experience these failing one at a time, suppose its an age related problem with them breaking down due to age.

Age related, parts breaking down............ sounds familiar

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