Knocking noise after spark plugs replacement
01-06-2019, 07:40 PM
#1
Thread Starter
Join Date: Jan 2019
Location: GA
Posts: 7
Knocking noise after spark plugs replacement
I bought 2000 Mustang V6 recently with 146k miles on the clock. It was running Ok but with No power for 3.8L engine so I went to the closest Advance Autoparts and got a set of plugs...I think Autolight. After installing the plugs and starting the car there was day and night difference as far as power and throttle response but after a short ride the car developed a cnocking noise. Mostly when the car worms up and on drive at low speed is when I can hear the noise but it drives me nuts. I’m going to do transmission service and see if that would change anything but in the mean time I was wondering if you guys can recommend a good mechanic who knows this cars that can help or give me an idea ? Or where I can run diagnostics on the engine and get a feel about the engine health. Thanks in advance for your input guys.
PS. I tried to upload a short video but it didn’t go throughout
PS. I tried to upload a short video but it didn’t go throughout
01-07-2019, 02:14 AM
#2
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Join Date: Jan 2018
Location: Pennsylvania
Posts: 2,327
Did you check the gap on the plugs? Just because you buy them gaped, does not
mean they are. You don't need to be a rocket science to install plugs...
Also, if your car WORMS up, you have a serious problem... The worms in there could be
causing the noise...
mean they are. You don't need to be a rocket science to install plugs...
Mostly when the car worms up and on drive at low speed is when I can hear the noise but it drives me nuts.
causing the noise...
01-07-2019, 06:37 AM
#3
Thread Starter
Join Date: Jan 2019
Location: GA
Posts: 7
I did gap the plugs.
I did gap the plugs at 0.054. So what is the problem I’m having?
01-07-2019, 07:41 AM
#5
Thread Starter
Join Date: Jan 2019
Location: GA
Posts: 7
01-07-2019, 05:12 PM
#8
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Join Date: Jan 2018
Location: Pennsylvania
Posts: 2,327
FYI, you have a coil pack.
AND, there are only three actual coils in the pack for the 6 cylinders.
4 & 3, 6 & 2, and 5 & 1.
So, when plug 3 fires, so does 4, and so on. However, 4 may be on the exhaust stroke when
3 fires, so you still can't mix the wires up, because when 4 fires, so does 3, but 3 won't be on
the compression stroke.
AND, there are only three actual coils in the pack for the 6 cylinders.
4 & 3, 6 & 2, and 5 & 1.
So, when plug 3 fires, so does 4, and so on. However, 4 may be on the exhaust stroke when
3 fires, so you still can't mix the wires up, because when 4 fires, so does 3, but 3 won't be on
the compression stroke.
01-07-2019, 10:03 PM
#9
3rd Gear Member
Join Date: Jul 2017
Location: AZ
Posts: 849
Can plugs which are too long, extending too far into the combustion chamber ion this engine, possibly contact the pistons? Pull one out, look at it's condition, and compare it's length to one of the old plugs. Just a thought.
01-08-2019, 05:46 AM
#10
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Join Date: Jan 2018
Location: Pennsylvania
Posts: 2,327
If you put the wrong ones in, they can. You should have compared them immediately
before putting them in. Some are a tad longer, some are a tad shorter, but if you
got the right ones when they were looked up, you should be fine. None will be
long enough to make contact with the pistons unless you were given the wroing
ones.
before putting them in. Some are a tad longer, some are a tad shorter, but if you
got the right ones when they were looked up, you should be fine. None will be
long enough to make contact with the pistons unless you were given the wroing
ones.
