I have a 2001 2.5l , it is jolting upon acceleration in 1,2,3,4 gears at around 2k rpm. Sometimes it even jolts at all RPMs and I can't drive it. Turning it off then back on, fixes it for 2 minutes, then it goes back to jolting. When it is idle and even when driving there is a heavy gas smell.CEL code p0171, I changed spark plugs, wires, distributor cap and rotor, and oil change. Any clue what I can try, thank you!
It could also be a vacuum issue, if the vacuum is leaking it could cause it to run super rich making it stutter and jolt, then misfire which would cause the P0171 because its not burning properly and that second o2 sensor then thinks its too lean.
It could also be your fuel pump, if the filter is clogged it would lean out the system and cause those symptoms.
I would start by checking for an obvious vacuum issue, then check fuel delivery. Mine was doing the same thing, I didn't get any codes but then again my CAT is gutted so the exhaust fumes would be stronger.
Is it happening immediately or does it seem to wait for the engine to warm up.
It should function on a closed loop and not draw info from the sensors until it gets to normal running temp. If its still happening cold, I would lean more towards a non-sensor issue if it seems to run better before coming off that closed loop then its more likely a sensor causing the ECM to send the wrong info like Jerry is saying.
(In my experience, and against my stubborn opinions, Jerry is pretty much right all the time)
A great tool I have been using as of late... https://play.google.com/store/apps/d...l.torque&hl=en
with a bluetooth ODBII reader, you can monitor voltages on the O2 sensors, see the fuel to air mix, pull real time intake and coolant temperatures.. all kinds of useful stuff along with reading clearing and looking up CEL codes.
Install an NTK which is the OE sensor, avoid Bosch. If you buy it locally, make sure the new 02 sensor has the same connector as yours does. Not all are the same, and some 02 sensors just come with bare wires.
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