Bucking, misfiring and cutting out

Tiny
TOOLSGREGORY
  • MEMBER
  • 2001 BUICK CENTURY
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
The vehicle will bucks, misfires and sputters under load. We replaced the MAF sensor. No change. Scoped the crankshaft position sensor. The pattern is a nice square wave and it says good when the bucking is going on. Misfire monitor shows no coil misfires. Fuel pressure is good. No codes are showing or pending
Do you
have the same problem?
Yes
No
Friday, October 11th, 2019 AT 9:59 AM

2 Replies

Tiny
TOOLSGREGORY
  • MEMBER
  • 2 POSTS
Update on the Buick century. The customer said cost was no option. We replaced the crankshaft position sensor, with again no fix. Pulled that off and put it back together. Next was the ignition control module. Finally we had some improvement. But now we had a constant misfire under load. We were getting a low number of misfires on number 4 monitor, around 6 to 14 per cycle. The wires were just replaced a few months ago and they looked great, so we then went with the number 4 1 coil. This is what the problem was from the beginning. We figure the coil was shorted out to the control module, as the 4/1 coil sits above the electronic part of the ignition module. We will not be forgetting about this one for a while. Thanks for letting me share, GH
Was this
answer
helpful?
Yes
No
Friday, October 11th, 2019 AT 4:51 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

Well you made it easy on us. Next time you post something we will make sure to give you a few hours again before we respond to see if you fix it. Just kidding.

Sorry we didn't get to you sooner but glad you got it fixed. Thanks for posting that info as well. I am sure that will help others that have a similar issue.
Was this
answer
helpful?
Yes
No
+1
Friday, October 11th, 2019 AT 5:29 PM

Please login or register to post a reply.

Sponsored links