Hi all new to the forum I have a 2000 Cad Deville a engine code says I had a missfire on number 4 plug,change all the plugs reset the data,still has a miss ,can someone tell me where number4 plug is so I can look farther Thanks Rob

 

When you are facing the engine standing at the front of the car, #4 is the second cylinder from your left on front front bank of cylinders. See below:

1 3 5 7

2 4 6 8

Front


A fault coil pack can cause a mis-fire as well. Make sure #4 coil pack connection is good.

 

Thanks for the reply Took the coil pac off to make sure it was clean reinstalled no differance.I phoned the local cad parts guy $375.00 new or $175.00 one from the junk yard.So I guess thats my next step.

 

$375 sounds like a lot of money but with a 2000 it would not be out of the ordinary to neednew coil pack atthis time. Why not spend $75 first and get a mechanic torun the diagnosis to be sure.

 

does the engine actually misfire or is it just appearing in information center? It's just unclear by how it's written, and rather than being assumptive...?

 

the engine does have a miss and has a lack of power,engine code says miss fire on #4 on my code reader

 

no possibility of a dose of bad gas? It can/does happen

 

hi my 2000 sts have same problem on my 5# changed all spark plugs and boots still same if i switch coil pac s what happens i will get #4 miss fire info probbly i m not sure they are same i dont want good coil pac get hurt please help me thank you.

 

Coil packs do fail, corrosion causes most of them. Unfortuneately one failing and the other failing 3-6 months later is not terriblely uncommon. They are somewhat expensive, you could go the used route "you take it off" types are best deals - 35.00 in my area.

 

if you looking of of front of car
1 3 5 7
2 4 6 8