Backfiring after new plugs installed

[JamesMilk]

Hello,

I'm a new member, but the first repair I have done to her(still need to name her), was changing the spark plugs. I got the old ones out and she needed new plugs so bad(see attachment below). Put in some double iridium plugs from Bosch. And after I relubed the plugs with the silicone jelly and plugged everything back in, only one side of the head is backfiring in the muffler. Still need to find out if im running just slightly lean to have this happen, or if some wiring needs to be replaced. I did notice one of the plugs was drenched in fuel when I removed it. Maybe 1 cylinder isn't sparking off... anyways if y'all have any experience with this, I would love to learn! Google gives bad advice!

 

[DanMcG]

could be a bad plug wire or you have a couple mixed up.

 

[89Suburban]

could be a bad plug wire or you have a couple mixed up.

Yup I am guilty of this mixing wire position error myself many times

 

[Vbb199]

18436572

 

[JamesMilk]

I will recheck wiring positions, and update what I find. Thought I put them all on correctly, but i did do the right side 1 at a time and the left all at once, so that may be the issue.

 

[MrHorsepowerLSx]

Popping the hood and looking at the motor the cylinders will go like this……..
Note: cylinder 1&2 are going to be the closest to the accessory drive

Drivers side cylinders goes as follows
1-3-5-7

Passenger side cylinder goes as follows
2-4-6-8

Find the number 1 position on your distributor cap and bring that plug wire to the first cylinder on the drivers side. Then start running your plug wires one at a time in a CLOCKWISE motion 1-8-4-3-6-5-7-2

You must be registered for see images attach

 

[JamesMilk]

Popping the hood and looking at the motor the cylinders will go like this……..
Note: cylinder 1&2 are going to be the closest to the accessory drive

Drivers side cylinders goes as follows
1-3-5-7

Passenger side cylinder goes as follows
2-4-6-8

Find the number 1 position on your distributor cap and bring that plug wire to the first cylinder on the drivers side. Then start running your plug wires one at a time in a CLOCKWISE motion 1-8-4-3-6-5-7-2

You must be registered for see images attach

Soo....

It seems I did swap a few cables that were cables on the left side... lol. 4&2 we're swapped and so was 6&8. Suprised it started tbh.

 

[MrHorsepowerLSx]

The motor will start…….. but it wont be happy, usually they give immediate tell-tale signs of sputtering and fire balls through the intake

 

[JamesMilk]

Yeah, now the battery is dying lol, gunna get her a jump, but she did fire right up after I got the cables in the correct order.

 

[MrHorsepowerLSx]

That’s great to hear. Keep on truck in’

 

[DanMcG]

Good news, now onto the next problem!
And as an old timer, can ya tell me what is silicone jelly?







/

 

[JamesMilk]

Good news, now onto the next problem!
And as an old timer, can ya tell me what is silicone jelly?







/

It's the stuff that makes sure the connectors don't get stuck to the plugs

 

[89Suburban]

Soo....

It seems I did swap a few cables that were cables on the left side... lol. 4&2 we're swapped and so was 6&8. Suprised it started tbh.

Easy fix FTW!!! Good job!

 

[MrHorsepowerLSx]

Silicone jelly is really called Dielectric Grease, it’s purpose is to Protect electrical connections and wiring from salt, dirt and corrosion. It helps extend the life of bulb sockets. It Prevents voltage leakage around any electrical connection, it can also prevents spark plugs from fusing to boots.

You must be registered for see images attach

 

[idahovette]

Hmmm, after hearing it called silicon jelly, I wonder what else it could be used for?????