My 2000 S10 2.2 L engine misfires or stumbles when lightly accelerating. At a certain engine speed and throttle position, the engine will miss. Doesn't happen under hard acceleration or very light. Engine has 240K miles, but compression is good on all cylinders, doesn't burn oil. So far, the plugs, wires, coils, cam sensor, crank sensor, TPS and timing chain have been replaced. Was reporting P0342 until camsensor was replaced. Now no codes, reports misfire on Cylinder#1 or random misfire.
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When you say "sputters at 2000 rpm" , are you referring to ANY time the engine is at 2000 rpm - meaning in Park, when you are just goosing the throttle, or in gear when you are accelerating, or at highway speed in high gear? If you are experiencing a "shuddering" in the engine at certain speeds/rpms - especially if these are speeds you regularly cruise at (long commutes at steady speeds), the problem could be in the Throttle Position Sensor (TPS). They have a tendency to wear unevenly if you drive a certain steady speeds. Eventually, the problem would progress to an engine code, but it may occur without setting the check engine light.
Could be a transmission problem or something as simple as bad spark plugs. The engine is under the most load when RPM is low and you are trying to accelerate, such as when it upshifts. You should have the computer checked for trouble codes and hopefully that will point you in the right direction to test. If the spark plugs have more than 50,000 miles of wear you might start with replacing them.
Check engine light does not have to come on unless the misfire monitor reaches a certain count.There it will pend a misfire code,and who know what code you get may just tell you P0300 random misfire,we know its misfiring .But we got the symptoms, The 2.2 is sensitive to water in the fuel system when you change the fuel filter were you able to get a sample of at least some.Where the ignition coil sits do you hear any arc at idle(in park) that can tell you you will need sparkplug wires. you can also use a spray bottle of water and spry it on the wire.see if that exposes any arc from the sparkplug wire. The fuel pressure on the 2.2 has to be 56-62 psi.This is the necessary pressure. Also the TPS can cause you to stumble intermittently and this is a common failure on the 2.2 engines
An engine that
hesitates, stumbles or misfires when accelerating or when
it is under load is an engine that is either sucking too much air, not
getting enough fuel or misfiring. If the Check Engine Light comes on,
you may find any of the following codes:
• P0171, P0174 Lean
fuel condition codes • P0120 to P0124 Throttle position sensor codes •
P0222 to P0229 Throttle position sensor codes • P0400 to P0409 EGR
related codes
If there are no misfire codes, a common cause of
acceleration stumble is a bad throttle position sensor (TPS). The TPS
tells the computer how far the throttle is open. The computer uses this
information to determine how much fuel is needed to maintain the correct
air/fuel mixture and when extra fuel is needed if the throttle suddenly
opens wide.
Another common cause is dirty fuel injectors. If
varnish deposits have built up in the tips of the injectors, they won’t
spray as much fuel as they normally do, or will “dribble” fuel instead
of spraying a fine mist. This creates a lean fuel mixture and
conditions that are ripe for stumble and hesitation (also misfire). Look
at short term fuel trim (STFT) and long term fuel trim (LTFT) with your
scantool.
If the numbers are high, it tells you the engine is running lean and
the injectors need cleaning. Treat mild cases with a high quality
fuel-injector cleaner additive. Severe cases require professional
cleaning equipment.
Also if this sensors apply to your
vehicle, camshaft sensor or
crankshaft sensor if sensors bad you don't get any spark. Also
run a scan on the car.
Go to your local shucks or auto zone and they can check any codes behind your check engine light and it's free. It sounds like one of two things a O2 sensor or your mass airflow sensor but they will tell you for sure
Did you ever do a tune up? If not you need to change the spark plugs pvc if you have one,some do and some dont anymore.also change the spark plug wires.This is where you have to start,even if your car was in a shop.Then you go from there if this does not fix your problem take to a good repair shop.
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