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2000 chevy blazer crank no start. I was told it overheated and has been parked ever since. (one year). I replaced cap, rotor, plugs and wires. wont start and only one code P0122. please help

When it cranks over it sounds like a prius and not like a 4.3 vortec...??

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P0122 is throttle position sensor out of limits low voltage.

Posted on May 16, 2017

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  • Cars & Trucks Master
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I'm not sure about a Prius? If cranking rpms sound faster than normal, you need to check compression.
You may need fresh fuel? After it sat that long I may have pulled the plugs and tried the crankshaft by hand, plus add few drops of oil in each cylinder, before cranking.
I saw what you replaced, what testing have you done? Did you visually check for spark at the plugs, engine cranking. Key on engine off, did you use a gage and check proper fuel pressure, with the spider fuel system, 60--66 psi. After it is started it may run with about 10 psi less. Engine cranking you have fuel injector pulse?
The code is for throttle position sensor. Three wire connector, 5 volt ref--ground--signal. You can use digital multimeter to check signal wire, just turn on the key, move throttle by hand, watch the voltage, closed throttle .36--.96 voltage, wot 4.0 min. Voltage should move up and down smoothly.

Posted on May 16, 2017

  • jessie May 16, 2017

    Yes I have spark. I also spayed starting fluid in throttle body and nothing. I'm getting fuel at the intake so pump is good. Obd throws one code p0122. So I replaced TPS, still nothing and same code. Today I will chk compression and fuel pressure. Thank u much

  • jack layton
    jack layton May 17, 2017

    Just because you have fuel, doesn't mean the pressure is good. With the spider fuel system, the key on engine off fuel pressure can be critical. This system is noted for problems.
    As far as the tps, check wiring circuits.

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Posted on Jan 02, 2017

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