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2005 chevy trailblazer_lt_ext
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2005 Trailblazer 213000 miles, factory with no aftermarket items. It would crank and not start, Crank was healthy and consistent. Towed to mechanic. It reacted the same for them, has correct fuel pressure. They removed spark plugs and found them fouled and wet. but could then get it to run but very rough. Cleaned Throttle Body and is still running rough if they start it in the garage, starting outside (25F to 40F) is almost impossible. There has been a P0420 code for the last month but it was running well other than fuel mileage dropped 1/2 MPG. Previous work was thermostat replaced 2 months ago and an ignition coil and spark plugs 4 months ago. Don't want to throw parts at it, codes were cleared and have not come back.

Thank You
 

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Have you checked the electrical connectors to the coils to make sure that they are getting the correct voltage to the coil primary windings and that they are getting the control pulses from the PCM? FYI, for the coil connectors, the Pink wires are supposed to be battery voltage, Black wires are ground, and the other color wire is the control signal from the PCM.

Good luck!
 

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2005 chevy trailblazer_lt_ext
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Discussion Starter #3
Have you checked the electrical connectors to the coils to make sure that they are getting the correct voltage to the coil primary windings and that they are getting the control pulses from the PCM? FYI, for the coil connectors, the Pink wires are supposed to be battery voltage, Black wires are ground, and the other color wire is the control signal from the PCM.

Good luck!

Thank you, it seems that the root issue is a low battery, While it cranked fine, once they charged the battery we could not get the condition to repeat. With the stay at home orders I haven't driven it in 4 day and the battery was completely dead. So now to start looking for a battery drain.
 
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