buckking while driving....

[bryan213]

two weeks ago replaced fuel pump and fuel filture ouch yea i kno expensive... sooo got it runnin allot better now past week i can feel it buccking forward... my check engine light is on for my top o2 sensor.... goin to replace it tomorrow but im really not thinking its because of my top o2 sensor being bad im more thinking like a mass air flow sensor something in that line .....

[[ion] C2]

it's the O2 sensor, lol.

unplug the o2 sensor electronically, and watch as your car runs better.

[bryan213]

never thought of just unplugging it haha so goina try it tomorow thanks

[Redog]

Does the tach jump when this happens?

If so, misfire, replace plugs

[[ion] C2]

Without a wideband or any good datalogging software you have no idea what's going on to your car when you get a jerking movement. Lean, rich, vacuum leaks, who knows. O2 sensor graph, TPS. My lean spike jerking issue was due to a faulty TPS. It read too low, so there was more air coming in than it could compensate for. It tried for a bit then failed (at the lean spike locations) was one hell of a time figuring that out, but what led to it was noticing the TPS graph was jaggy. Can't tell that without software.

But you even have a dummy light on for the upstream O2, fix what you know is wrong, then if a problem remains, locate that solution.

[bryan213]

replaced 02 sensor feels allot better... will kno tonight if its allot better ..

[bryan213]

well this morning engine light poped back on hate this car... soo the code was p0174 fuel system to lean/ rich. relaced o2 sensor yesterday .... alldata says poss causes. dirty fuel injectors... fuel press. reg..... dirty mass air flow.... dirty tps.... sooo i work at sears auto center in burlington nj.. and we have a fuel system cleaning system... i used the throttle body cleaner and sprayed it in deep into the intake let it run for like 20 min and fells allot better... also light is off hope this helps ... also cleaned the mass air flow sensor while i had my warm air intake off.

[bryan213]

magnaflow cat ......... dont every buy anything from them engine light poped back on ....cat eff. need a replacment cat now.... called magnaflow but they said i needa send mine back to cali and they will flow test it and then ill know if its bad or not.

[[ion] C2]

You do realize that a higher flow catalytic converter is in its nature, less efficient, which causes a COMPLETELY HARMLESS "catalyst efficiency low" code to appear. Just because the cat doesn't convert the toxic gases as well as the stock one doesn't mean it's bad or that it's clogged. When my cat plugged completely up, there were zero DTCs showing. Now that I have no cat, I just have all relevant codes disabled.

[bryan213]

then whats the point of having a 49 state legal cat when the car is 49 state legal.... i belive its bull magna flow states their cats will cause no engine lights at all .... i have lights because of their cat... just pissin me off cars for sale for 5600 also any buyers please rather it stay in the alero mod fam.

[Caboose73]

Good luck trying to sell a broken alero for $5600

[bryan213]

haha accually got it all fixed up finally got hp tuners n everything good now