1999 LX470 misfire

[Temirovich]

My LX470 was run good and no problem till I want put new spark plugs and new ignition coils. With new spark plugs was runing good but week later I put new coils it show misfire in #2,#5,#8. I cheked spark plugs,looks fine,I put old coils on 2,5,8 back and its still misfire. I checked all plugs and connections many times. Any idea why its start misfire after I install new spark plugs and coils? Thank you

 

[unklwedy]

Have a hard look at little tiny electrical contact pins in coilpack connectors

 

[Temirovich]

Have a hard look at little tiny electrical contact pins in coilpack connectors

Ok,what do I need look for?

 

[flintknapper]

One at a time, swap a known to be good coil pack to each cylinder that is showing a misfire. Start with #2. If that stops the misfire on that cylinder, then it can be attributed to the new coil pack. IF it doesn't stop the misfire...I would suspect the wiring. Then do the same with the others.

I use a little dab of dielectric grease on the harness and pins of each coil to ensure a good connection.

 

[Temirovich]

One at a time, swap a known to be good coil pack to each cylinder that is showing a misfire. Start with #2. If that stops the misfire on that cylinder, then it can be attributed to the new coil pack. IF it doesn't stop the misfire...I would suspect the wiring. Then do the same with the others.

I use a little dab of dielectric grease on the harness and pins of each coil to ensure a good connection.

I will try,thank you