Misfire under load

B

Billbob10

Member
 Millom Cumbria
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
 
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 :thumbsup:
 
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 said:
Many thanks for that I may change them all , i was thinking they may be the originals
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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.
 
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.
 
colb said:
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.
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Age related, parts breaking down............ sounds familiar :oldman:
 
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