spark plug

[jstarr]

Help i just changed plugs in my 2002 986 New plugs came from suncoast it runs rough now i have checked everything twice there appears to be no damage to the wireing not sure what to do now except to reinstall thr old plugs any ideas takeing everthing apart and putting it back twice is alot of work im whipped yhanks

[Loren]

Check for:

- loose spark plugs

- cracked coil packs

- coil pack electrical connector not snapped into place

The last item is the most likely cause.

[Kimo]

Check for:

- loose spark plugs

- cracked coil packs

- coil pack electrical connector not snapped into place

The last item is the most likely cause.

I don't mean to be funny, but did you set the gap on the plugs. I only say this because you didn't mention it.

Kimo

[Tool Pants]

99% of the time it is going to be because the electrical connector to one or more of the coils is not seated properly, if the coils were disconnected during the spark plug change. The rubber boot for the connector sort of gets in the way when trying to fully seating the connector.

It only takes 1 of the 6 connectors not being seated properly to make a 6 cylinder engine run rough on 5.

At the work on cars thing, I remove the coils and replace the 3 plugs on one side. Then I start the car to see if there is a misfire. If there is, then I know it is 1 of those 3 connectors not being seated properly. If there is no problem I go to the other bank to replace the other 3 plugs.

If you replace all 6 and then start the car and there is a misfire, then it takes longer to figure out which plug is the problem.

[JFP in PA]

If you replace all 6 and then start the car and there is a misfire, then it takes longer to figure out which plug is the problem.

Wouldn't an OBD II scanner pick out which one it is?

[jstarr]

Check for:

- loose spark plugs

- cracked coil packs

- coil pack electrical connector not snapped into place

The last item is the most likely cause.

CK the coil packs removed

and inspected

coil connector ck twice reinstalled

all plugs tight

Thanks for the help will keep looking

[jstarr]

Check for:

- loose spark plugs

- cracked coil packs

- coil pack electrical connector not snapped into place

The last item is the most likely cause.

I don't mean to be funny, but did you set the gap on the plugs. I only say this because you didn't mention it.

Kimo

rookie mistake didnt ck thanks

[jstarr]

99% of the time it is going to be because the electrical connector to one or more of the coils is not seated properly, if the coils were disconnected during the spark plug change. The rubber boot for the connector sort of gets in the way when trying to fully seating the connector.

It only takes 1 of the 6 connectors not being seated properly to make a 6 cylinder engine run rough on 5.

At the work on cars thing, I remove the coils and replace the 3 plugs on one side. Then I start the car to see if there is a misfire. If there is, then I know it is 1 of those 3 connectors not being seated properly. If there is no problem I go to the other bank to replace the other 3 plugs.

If you replace all 6 and then start the car and there is a misfire, then it takes longer to figure out which plug is the problem.

re fit the rubber boots at least twice but didnt work one side then the other good tip thanks

[jstarr]

If you replace all 6 and then start the car and there is a misfire, then it takes longer to figure out which plug is the problem.

Wouldn't an OBD II scanner pick out which one it is?

Thanks will try and find a scanner soon

[wvicary]

If the connector isn't broken you should hear a click when it's seated correctly into the coil.

[jstarr]

Check for:

- loose spark plugs

- cracked coil packs

- coil pack electrical connector not snapped into place

The last item is the most likely cause.

you are right connector not snapped it was hard to tell at first thanks for the help this a great wed site

[dallison]

If you replace all 6 and then start the car and there is a misfire, then it takes longer to figure out which plug is the problem.

Wouldn't an OBD II scanner pick out which one it is?

yes, and it did for mine. I could have sworn that it clicked.