Question about 2000 Chevrolet Blazer

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Check engine Changed plugs wires cap o2 sensor and has o2 sensor switching problem code

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Just a simple exhaust leak can do that you can start the car and lift the car up on a lift have some one with a rag in there hand cover the tail pipe and then someone else can go the length off the pipe and lesson for a leak

Posted on May 18, 2014

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I would need to know the code #.
Lee

Posted on May 08, 2014

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Two possibilities for a slow O2 sensor. The catalytic converter is wore out. Or the engine control module is wore out. When it comes to the wires, they either work or don't. My guess would be that catalytic converter...This does effect the gas mileage and it will only get worse. The have aftermarket cats for GM.

Posted on May 08, 2014

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Which o2 sensor did you replace? on 1996 and newer vehicles there are two o2 sensors: the upstream o2 sensor, which is before the catalytic convertor and moniters the air/fuel ratio in the exhaust. the downstream o2 sensor, which is after the catalytic convertor and moniters the exhaust emissions coming out of the convertor. you should have an error code that will tell you which o2 sensor is faulty, sensor 1 (upstream) or sensor 2 (downstream).

Posted on May 08, 2014

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Posted on Jan 02, 2017

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SOURCE: Check Engine Light - O2 Sensor - bank 1 running lean

you should have three oxygen sensors on your car, one for each bank of three cylinders; should be towards the Y pipe on each exhaust manifold. Additionally you should have one on the exhaust pipe before the cadilitic converter.

Posted on Nov 20, 2008

  • 66 Answers

SOURCE: O2 sensor problem

I have a 97 gmc sierra .This truck is the same as the chevy ok.Its a 350 5.7 liter 4x4 Z71.I took it to auto zone which was my first mistake.They put it the scanner and said bad O2 sensor.Ok so which one is it i said.They dont know.Well there four (4) O2 sensors in this truck i hope you know that.I had to replace all four of them before i had to take it to a real shop.It seems the fuel pump i replaced a week earlier with an auto zone fuel pump was bad.Ive changed my feul pump 4 times now and have 235000 miles on still running.You need to get your fuel pressure checked.It should be 65 psi to start it and 55 psi to run it.If the pressures are good it could be a different O2 sensor or maybe the mass air flow senor.My last option would be the fuel pressure regulator because it seems to be a waste of time and money.I would get that fuel pressue checked first.Good luck.

Posted on Nov 25, 2008

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SOURCE: Random engine misfiring- fault code P0300- 1999 cutlass

Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300

Posted on Dec 15, 2008

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SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

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SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

Posted on Oct 21, 2009

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