Not starting

Tiny
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Sounds like a plan.

Roy
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Monday, August 20th, 2018 AT 4:14 PM
Tiny
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Roy,

I got the OBD II reader from NAPA, only one stored code P0122=Throttle/Pedal position sensor/switch "A" circuit low.
And all the Live and I/M Readiness readings. Wrote them all down, what are you looking for?
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Tuesday, August 21st, 2018 AT 1:40 PM
Tiny
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When cranking the engine, does it show an RPM signal?

What is the voltage of the TPS or throttle position sensor?

Roy
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Tuesday, August 21st, 2018 AT 2:22 PM
Tiny
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200 to 210 RPM, the reader did not give a voltage, would a low voltage stop the truck from starting? And is that the voltage leading into or out of the TPS?
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Tuesday, August 21st, 2018 AT 2:48 PM
Tiny
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Is there a percentage reading on the TPS? There should be either a voltage reading or a percentage reading.

Roy
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Tuesday, August 21st, 2018 AT 2:55 PM
Tiny
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TP (%) 0.0 ignition on and start.
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Tuesday, August 21st, 2018 AT 3:06 PM
Tiny
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With the key on, push the pedal down to the floor and see if it goes up, both the voltage and the percent.

Roy
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Tuesday, August 21st, 2018 AT 3:14 PM
Tiny
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Did that, 0.0%.
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Tuesday, August 21st, 2018 AT 3:22 PM
Tiny
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Okay,

Go to the TPS connector and see if you have a 5 volt signal there.

Roy
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Tuesday, August 21st, 2018 AT 3:28 PM
Tiny
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Will do, tomorrow. Headed for bed in twenty minutes.
If not 5 volts then what? Bad TPS?
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Tuesday, August 21st, 2018 AT 3:43 PM
Tiny
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No, ECM or wiring.

Roy
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Tuesday, August 21st, 2018 AT 3:48 PM
Tiny
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Okay, thanks again Roy.
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Tuesday, August 21st, 2018 AT 3:52 PM
Tiny
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You are welcome.
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Tuesday, August 21st, 2018 AT 4:03 PM
Tiny
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Got a few minutes last night.
Battery 12.49 volts.
TPS lead 1-steady 5 volts.
TPS lead 2- strong ground.
TPS lead 3 -.55 volts at idle steady increase to 4.65 volts at full throttle.
I will try to test the signals going to the coil driver and coil tomorrow.
Thank you Roy.
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Thursday, August 23rd, 2018 AT 11:25 PM
Tiny
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Roy,
I had some issues getting back on the site, Ken helped me out, Thanks Ken.
My wife and I finally had a day off together, she cranked the engine over while I checked the coil lead and then the number one spark lead, both worked great, fuel still at the Schrader valve. I guess my next move is to test fuel pressure, somewhere between 56-62 PSI is best, if below 56 they sold me a weak pump= replace the pump again, if it is between 56-62PSI then what?
Thanks Roy
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Friday, August 31st, 2018 AT 1:31 PM
Tiny
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Lets take one step at a time.

Test the pressure. If it is below the spec, it will require a pump.

If it is good then we need to check to see if the PCM is commanding the injectors to inject fuel

Roy
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Saturday, September 1st, 2018 AT 5:34 AM
Tiny
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Got it, new pump, but may be weak, next day off next Saturday the eighth.
Weather permitting.
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Saturday, September 1st, 2018 AT 2:13 PM
Tiny
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Okay, will be here to help you when you need it.

Roy
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Saturday, September 1st, 2018 AT 2:22 PM
Tiny
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Well Roy, I have done some reading online, tried a "starting fluid test" ran like a trooper while the fluid lasted then shut off, that told me good compression, spark, and timing. I borrowed a fuel pressure tester from a friend, jumped the fuel relay, only got 30-32 PSI Haynes book says 60-66 PSI. I remember reading somewhere that if there is not enough fuel pressure the poppet valves will not open allowing fuel into the cylinder.
Could that be the only cause for fuel not getting from the Schraeder valve to the cylinders?
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Saturday, September 8th, 2018 AT 3:05 PM
Tiny
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As I stated before, you need 55-62 lbs of pressure. 35 will not start the truck.

You need to replace the pump and then retest to see if you have the correct pressure.

Roy
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Saturday, September 8th, 2018 AT 3:34 PM

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