2000 4.3 Blazer misfire cannot diagnose
Hello all. My first post.
I have a 2000 Chevy Blazer with 170k miles on it. It started misfiring recently which caused the SES light to come on. I tried nearly everything and still cannot diagnose the problem. I get the following codes: P0301 - most of the time P0300 - some of the time in lieu of P0301 P0171 and P0174 - some of the time P0302 - came on once Obviously, the codes change without any rhyme or reason. The car runs but shakes a lot around 1800 RPM. It seems that it gets smoother when it's over 2000 RPM. Gas mileage is around 9MPG. Some days it runs better than the others. When under load (usually over 3000RPM), the SES flashes. The fuel pressure is good, pressure remains the same after shutting the car off as supposed to. At idle fuel trims are over the roof. STFT is frozen at 50 and LTFT is at 25. There are no vacuum leaks. So far I changed spark plugs, wires, distributor cap, rotor. Still the same. What bothers me the most is the inconsistency with which it switches from P0301 (Cyl#1 misfire) to P0300 (Multiple Cyl misfire). Anybody had the same symptoms? What could it be? |
Any suggestions guys?
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Another thing happened today. I got P0147 (O2 Sensor heater circuit malfunction on bank 1 sensor 3) for the first time. I didn;t come back after I cleared it off.
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2000 S10 misfire mystery
Originally Posted by bil2000
(Post 267099)
Any suggestions guys?
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