Problems after spark plug change

[Drew2o2]

Yesterday i put in some NGK V-power spark plugs along with a napa PCV. After this the car running a little funny in the lower rpms. It kinda bucks when at a low rpm and the engine appears to be shaking more than usual. I put the stock pcv back in to see it that helped, nothing. The car is 1995 5.0 5 speed with 103k. Any ideas on the problem?

 

[1TallMF]

Check to make sure your wires are all making good contact on the plugs and that they all "clicked" into place. Every single time I've ever experienced a misfire or bucking, its always been plug wire related. Thats 4 times now.

 

[go-stang5.0]

Also make sure that the wires are plugged into the proper cylinders. YOu may have messed up the firing order by plugging a plug wire to a wrong spark plug.

 

[HISSIN50]

This is an awesome time to run a cylinder balance test. It will pick up the miss and tell you which cylinder is at fault. This saves checking every plug and wire and still wondering.

The CBT is part of the self test diagnostics. See your manual or code reader book for more info.

Good luck.

 

[mo_dingo]

Like JT said, do a CBT. I like to do it manually. It's easier IMO. Just get some good thick gloves..lol.

But go over the wires one more time, 13726548 counter-clockwise on the dizzy. No 1 cylinder is front pass. side, 4 is rear pass side, 8 is rear drivers side
Scott

 

[Drew2o2]

I know the plugs are in the right order as i only took one wire off at a time and i checked to make sure they were clicked. Im also gonna pull them out and check to make sure the gap is correct.

 

[juicedcoupe408]

ALSO YOU MIGHT HAVE DAMAGED THE END WHEN PULLING THEM OFF WERE ANY OF THE A BIOTCH TO GET OFF??

 

[Rootus]

You might also check that none of the plugs cracked when you installed them. A cracked insulator will allow the spark to bridge directly to the block -- typically this causes bucking at lower RPM, and then smooths out as the revs come up.