98 century 3100 v6

Asked by Mar 17, 2016 at 03:03 PM about the 1998 Buick Century Custom Sedan FWD

Question type: General

Just replaced the intake manifold gasket on my
Buick century 3100, and now I'm having problems
with the idle and with it running. It's not wanting to
go into high revs, and at idle it runs rough. I keep
getting a MAF sensor reading and a general misfire
reading, but I replaced the MAF and it didn't fix the
problem. Any ideas on what's causing this?

6 Answers

5,375

Double check your vacuum lines. A manifold vacuum leak can cause symptoms similar to what you are describing and you would have removed some to do the gasket change.

I've got all the vacuum lines reconnected and none of them seem like they're leaking. My throttle position sensor put up a code, so I'm wondering if it isn't that. If it isn't, how can I get the butterfly valve to open with the throttle?

It operates fine if we manually play with the throttle cable, but at an idle it's running really rough and under load it won't accelerate past 2k rpm

5,375

Adjust the cable, maybe?

That's what I figured but it wasn't tampered with enough to need to be rearranged

885

Check to see if the spring inside the throttle position sensor (TPS) is broken - you will need to take it off the throttle body to do so. It will be obvious when you move the "D" shaft on the back plate of the sensor, and it provides no resistance. If the spring is broken, the TPS will not correctly note the position of the throttle plate, and subsequently send an incorrect signal to the cars computer. This will cause issues including those you have noted.

Your Answer

Century

Looking for a Used Century in your area?

CarGurus has 733 nationwide Century listings starting at $2,395.

ZIP:

Buick Century Experts

  • #1
    John Saffrahn
    Reputation
    1,000
  • #2
    Tom Demyan
    Reputation
    830
  • #3
    John Pate
    Reputation
    580
View All

Related Models For Sale

Used Buick LeSabre
5 Great Deals out of 1,670 listings starting at $899
Used Buick Regal
162 Great Deals out of 7,454 listings starting at $3,995
Used Buick Park Avenue
372 listings starting at $1,495
Used Chevrolet Malibu
1,130 Great Deals out of 62,899 listings starting at $880
Used Toyota Camry
1,126 Great Deals out of 87,385 listings starting at $995
Used Honda Accord
1,120 Great Deals out of 74,857 listings starting at $1,100
Used Toyota Corolla
1,007 Great Deals out of 67,329 listings starting at $1,699
Used Chevrolet Monte Carlo
13 Great Deals out of 1,241 listings starting at $999
Used Honda Civic
843 Great Deals out of 61,322 listings starting at $950
Used Ford Taurus
242 Great Deals out of 15,306 listings starting at $1,800
Used Ford F-150
3,299 Great Deals out of 224,480 listings starting at $1,200
Used Pontiac Bonneville
473 listings starting at $2,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.