2004 Buick Lesabre Running weird

SIRCARSALOT

MEMBER
2004 BUICK LESABRE
171,000 MILES

Ok so I pulled the spark plugs out of my car (one at a time) to check them to see if they need to be changed (they need to be changed) after putting them back in and starting the car I noticed the "Service engine soon" light was on started to drive the car it drove fine then started sputtering and jerking for a few seconds then went back to normal then about 30 seconds later it sputtered and jerked again then went back to normal what do you think could be causing this problem?

Wednesday, September 11th, 2013 AT 3:46 AM

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Scan for codes and check fuel pressure with a gauge first. Auto parts rent gauges and will scan for free

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Wednesday, September 11th, 2013 AT 6:26 AM

HMAC300

MECHANIC
48,601 POSTS

Also check to see ifyou put the plug wires on correctly. See pic

Image (Click to make bigger)

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Wednesday, September 11th, 2013 AT 6:30 AM

MADMIKE1735

MECHANIC
951 POSTS

Once you verify the firing order is correct, verify that you have the wires fully seated to your coil packs, and onto the spark plugs. The rear bank is kinda tough to access, so having the plug wire not fully seated is most common. Its happened to me before. Also, sometimes techs will swap coils, so the numbers on them no longer correlate to the cylinders. I hate it when they do that, because it makes diag that much harder.

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Saturday, September 14th, 2013 AT 6:54 PM