bad miss under load
Yesterday, leaving saint john, going up a hill, the tranny is in top gear, and the engine is missing randomly. Its pretty frequent. Just a random shudder, like a misfire. Idles smooth, WOT was smooth. Driving on relatively flat areas with OD, seemed to work good.
Sympton seemed to go away after 1/2 hour to 45 mins driving.
This morning, (-10 c out) drove back to SJ. The miss was worse. By the time I got to SJ, it was missing if you put much of a load on. WOT and it misses more. Still has power, not much hesitation.
Scantool shows 0 KR at idle. Got codes 23, 43, and 65. IAT is pegged right at -40, and does not change even though its in the shop. Not sure what it will be with an increase of engine speed, and i still need to do some test driving with the scantool to see what the KR is. More than liekly, i'll change the sensor when i get home.
I'm going to do some testing on the knock sensor when i get home tonight. Whats the liklihood of those going bad? At least I have some spares if i need em. Should also see about fixing the IAT, but don't see that being a contributing factor to the miss.
2009 Pontiac Vibe AWD 2.4
1993 Buick Park Avenue 3800
1984 Chevrolet Citation 2.5 liter four.