No Start

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2 months 1 week ago #202177 by babyblaze2000
No Start was created by babyblaze2000
We had to change the distributor in my 1997 Chevy Tahoe 5.7 4wd. After putting the distributor in my truck, we used the scanner to do the cam retard. But my truck will not start on its own! We have to put gas into the throttle body in order to start it! Once started, it idles fine, but when I put it in gear and push on the gas pedal, it dies. What do I need to do, to get the initial gas into the motor for it to start? And how do I keep it running after putting it in gear?

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2 months 1 week ago - 2 months 1 week ago #202179 by nightflyr
Replied by nightflyr on topic No Start
Suggest you start with check your fuel pressure at the rail.
From what your stating it appears yours is low.
Last edit: 2 months 1 week ago by nightflyr.

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2 months 1 week ago #202180 by babyblaze2000
Replied by babyblaze2000 on topic No Start
We did check fuel pressure. It said it was 55?? I don't know what it is supposed to be!
But if the fuel pressure was low, wouldn't it prevent it from idling as well?
When I talked to my husband on the phone, he said that we should hear the injectors come on real quick if we turned the distributor. We don't hear anything!!
Could it be the camshaft sensor? How do I check that thing to see if that is bad? Cause I have the one that was off my original distributor as well as the one on the distributor from picknpull!

Thanks

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2 months 1 week ago #202182 by nightflyr
Replied by nightflyr on topic No Start
If the cam sensor was preventing the engine from starting..
Putting fuel in the intake would make no difference.
But you say after putting fuel in the throttle body the engine will start and run
I still believe you have some sort of fuel delivery issue.
If it is a cam sensor you'll need a good diagnostic tool or a scope setup to see if your getting a cam signal.

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2 months 1 week ago #202184 by babyblaze2000
Replied by babyblaze2000 on topic No Start
Do you think it could be the map sensor or the fuel pressure regulator?

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2 months 1 week ago #202186 by nightflyr
Replied by nightflyr on topic No Start
Without looking to see if there are any codes or diagnostics, any suggestion would be just a guess.

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2 months 1 week ago #202218 by babyblaze2000
Replied by babyblaze2000 on topic No Start
The codes that pull up now are P0300 - Engine misfire detected
and P1345 - CKP/CMP Correlation Problem.

I don't know what the P1345 means at all!

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2 months 1 week ago #202219 by nightflyr
Replied by nightflyr on topic No Start
The Crankshaft Position (CKP) sensor is a permanent magnet generator, known as a variable reluctance sensor. The magnetic field of the sensor is altered by a crankshaft mounted reluctor wheel that has seven machined slots, 6 of which are equally spaced 60 degrees apart. The seventh slot is spaced 10 degrees after one of the 60 degree slots. The CKP sensor produces seven pulses for each revolution of the crankshaft. The pulse from the 10 degree slot is known as the sync pulse. The sync pulse is used to synchronize the coil firing sequence with the crankshaft position. The CKP sensor is connected to the powertrain control module (PCM) by a signal circuit and a low reference circuit. The Camshaft Position (CMP) sensor is triggered by a notched reluctor wheel built into the exhaust camshaft sprocket. The CMP sensor provides 6 signal pulses every camshaft revolution. Each notch, or feature of the reluctor wheel is of a different size for individual cylinder identification. This means the CMP and crankshaft position (CKP) signals are pulse width encoded to enable the powertrain control module (PCM) to constantly monitor their relationship. This relationship is used to determine camshaft actuator position and control its phasing at the correct value. The PCM also uses this signal to identify the compression stroke of each cylinder, and for sequential fuel injection. The CMP sensor is connected to the PCM by a 12-volt, low reference, and signal circuit.

That is the technical explanation.

You may have an issue with the following:
Distributor was installed incorrectly.
Distributor timing is not set correctly
Not 100% sure if a CKP/CMP Correlation relearn is needed on your vehicle.
Timing chain stretched / worn.

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2 months 1 week ago #202231 by babyblaze2000
Replied by babyblaze2000 on topic No Start
So, none of my problems would be because of the map sensor, right? Because that was what we were gonna go buy next!
Oh, how would i do a relearn?
When the rain stops, we will go check the distributor, timing, and timing chain!

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2 months 1 week ago #202233 by nightflyr
Replied by nightflyr on topic No Start
So, none of my problems would be because of the map sensor, right? Because that was what we were gonna go buy next!
Not according to the code you listed.

Oh, how would i do a relearn?
When the rain stops, we will go check the distributor, timing, and timing chain!
Before a relearn, you need to determine if the distributor is aligned and timed correctly.
How much ( if any ) the timing chain is stretched or worn and might need replacing.
Then you will need to check what the actual CKP/CMP Correlation is with a scan tool or scope.
Again, I do not know for certain if your vehicle requires a relearn procedure but it can be done through a professional scan tool.
Pretty much all the information concerning this can be found on youtube.

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