can a faulty upstream ho2 sensor give a false read of multiple misfire

65

Asked by May 19, 2015 at 09:16 PM about the 2004 Pontiac Grand Prix GT1

Question type: Maintenance & Repair

car is automatic,series 111,,and when I pull it down in first gear and get up to about 25 kms it begins to bog,,however if I increase the speed to about 55 kms it comes out and has power to spare, it is NOT the mass air flow sensor,,it has been duly cleaned and vent checked for sticking,also I can hear the bog out of exhaust at higher speeds of 120 and beyond,and the engine light will flash,,ive changed everything electrical there is,ex plugs wires coils,ignition plate,EGR valve pc valve is ok too,,,diagnostics show faulty oxygen sensor and multiple misfire . Head gasket not leaking,there is a slight spark knock when car is floored,but only briefly.,,

3 Answers

70,295

Sounds like you need a tune up (new spark plugs and spark plug wires). If you have over 160,000 km on your Grand Prix you're over due for a tune up. As part of the tune up check both the primary and secondary resistance values on the coil packs. If one is bad, replace all 3. HTH. - Jim

65

found out the cars transmission has to be paired up with the computer,,to shift and not bog out,,thanks for your help

1 of 1 people found this helpful.
70,295

Thank you for letting us know. You're welcome. Glad to help. Glad you have it fixed. -Jim

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,731 nationwide Grand Prix listings starting at $1,500.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,390
  • #2
    Tom Demyan
    Reputation
    2,990
  • #3
    munron
    Reputation
    2,400
View All

Related Models For Sale

Used Chevrolet Impala
521 Great Deals out of 34,217 listings starting at $950
Used Pontiac Bonneville
3 Great Deals out of 524 listings starting at $1,799
Used Chevrolet Monte Carlo
14 Great Deals out of 1,311 listings starting at $1,950
Used Pontiac G6
60 Great Deals out of 3,938 listings starting at $1,295
Used Pontiac Grand Am
1,064 listings starting at $1,899
Used Ford Mustang
712 Great Deals out of 38,333 listings starting at $895
Used Pontiac GTO
12 Great Deals out of 480 listings starting at $5,995
Used Chevrolet Malibu
1,118 Great Deals out of 71,687 listings starting at $2,499
Used Chrysler 300
337 Great Deals out of 17,915 listings starting at $1,295
Used Honda Accord
1,130 Great Deals out of 62,430 listings starting at $1,199

Used Cars For Sale

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.