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

56,535

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 out of 1 people think this is helpful.
56,535

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

Your Answer

Add photo

Related Questions

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 3,751 nationwide Grand Prix listings starting at $1,995.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,770
#2 Tom Demyan
Tom Demyan
Reputation 2,510
#3 munron
munron
Reputation 2,010
View All

Related Models For Sale

Used Chevrolet Impala
920 Great Deals out of 36,052 listings starting at $1,500
Used Pontiac Bonneville
4 Great Deals out of 672 listings starting at $2,298
Used Pontiac G6
140 Great Deals out of 4,883 listings starting at $999
Used Chevrolet Monte Carlo
17 Great Deals out of 1,730 listings starting at $1,695
Used Pontiac Grand Am
1,703 listings starting at $1,995
Used Chevrolet Malibu
1,112 Great Deals out of 78,203 listings starting at $2,495
Used Pontiac GTO
5 Great Deals out of 494 listings starting at $5,900
Used Chrysler 300
514 Great Deals out of 20,476 listings starting at $1,500
Used Ford Mustang
724 Great Deals out of 38,166 listings starting at $1,750
Used Nissan Maxima
425 Great Deals out of 24,976 listings starting at $1,500
Used Jeep Grand Cherokee
1,087 Great Deals out of 69,712 listings starting at $495

Used Cars For Sale