Car Repair > why would 3 sprak plugs on the left side of the engine have ... >

why would 3 sprak plugs on the left side of the engine have the electrode coating erroding or burning away to the point of exposing the electrode at the tip and the 3 plugs on the right side be just fine.This is a 2000 mustang, 3.8 ,auto with 32,000 miles.fuel pump was replaced about 2 years ago.could problem be w/fuel injectors?

Optional Information:
2000 Ford mustang 3.8

Already Tried:
changed plugs

Customer (name blocked for privacy)

How was the car running??

Has the check engine light come on??

Are you replacing plups for maintenence reasons or other reason??

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Reply to MechanicMan's Post: I noticed that the tail pipe had some excess carbon(very black)on it so i decided to change plugs.car is running smoother after changing plugs. No engine light has come on and i thought it was time to change the plugs,air filter(instaled k&n)and oil.I noticed a couple of months ago that it seemed to run through the firing order half and half.it would Run smooth and run like one or two cyclinders werent on top of there game so to speak.I have some background in cars and something doesnt feel right. I posted a Question to mike earlier about reg or permium gas to see if a change of fuel would help keep it in shape. Car is well taken care of.

It sounds as if that bank may been running lean, where the plugs white and blistered were any of them black?

Also can you get access to scan?

Check to see if there any vacuum leaks common to those cylinders.

Let me know.

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Reply to MechanicMan's Post: Plugs had carbon deposits around the bottom of the threads and i still get alittle popping like i have a hot cam but the idle is not as hard as it was.I am using shell gas instead of PDQ or SPeedway.I did check for vacuum leaks and am still looking at it.I would have to take it in for a scan since i dont have one.I bought this car brand new and i am the only driver.Warrenty took care of the fuel pump at a ford dealer where i bought it.Any other hints would be helpfull before i take it in to have it check and to give them some idea of what to look for.

They will need to look at fuel trim info, both long and short term. Also look for O2 operation, timing control and codes.

The plugs from left side, were they white and blistered?

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Reply to MechanicMan's Post: plugs were black and burnt but the electrode had been exposed at the end.Imagine the end of a bic pen as something to visualize this problem.

I almost forgot double check intake, plastic right?? look for cracks and especially look at sealing surfaces. Have someone sit in vehicle in drive at aldle (FOOT ON BRAKE) usa garden hose with water and go aroung intake check for miss. Dont flood the engine on need small flow of water. Also there is usually a 90 degree vacuum port on the rear of intake real close to firewall Try these first.

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Reply to MechanicMan's Post: intake is plastic mounted on right fender coming form the grill,rubber to the throttle body.I am going to take it to autozone for a free scan before i do any thing to see if there is a problem with any of the things that you mentioned.They do this for thier customers.You have been very helpful in this matter and i thank you.

How did it come out????

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