Car only start when reset computer

409SANTANA

MEMBER
2004 BUICK CENTURY
3.1L
V6
180,000 MILES

I ask this question before but a lost my phone, car only wants to start when reset computer. Sometimes it's starts in the morning only if it's start in the first two attempts then it only cranks. I replace both crank censors, and the ECM (reprogrammed aftermarket plug and play) relearn the key. Replace the coil pack and module from a running car new. Plugs and wires. Also replace fuel pump and regulator some time ago (old problem but thought it may help to know) but no improvement or changes. Please help.

Sunday, August 25th, 2019 AT 12:48 PM

5 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Good evening.

Are there any codes set in the computer?

When it does not start, does the engine crank?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Roy

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Sunday, August 25th, 2019 AT 3:30 PM

409SANTANA

MEMBER
14 POSTS

It had a crank censor code. A knock sensor performance code and O2 rich and aO2 lean code, but all code before a change the parts. Also installed and O2 sensor (sorry I forgot), and yes it always cranks.

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Sunday, August 25th, 2019 AT 4:21 PM

ASEMASTER6371

MECHANIC
52,796 POSTS

Okay. What are the code numbers?

Roy

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Sunday, August 25th, 2019 AT 5:28 PM

409SANTANA

MEMBER
14 POSTS

Good day Roy, right now it has codes PO134, PO135 and PO327 pending because I have to reset the so many times. In the scan tool OE history it have PO130, PO131, PO132, PO133, PO136, PO137, PO138, PO171, PO172, PO325 and PO420. Thanks

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Monday, August 26th, 2019 AT 9:03 AM

ASEMASTER6371

MECHANIC
52,796 POSTS

Okay, the 420 is a catalytic converter code. You need a catalytic converter.

134,135 are for the heated O2 sensors. This could be a wiring issue to the sensors. Check the diagram I attached.

Check the fuse listed for the O2 heaters.

I attached a location of the knock sensor.

Roy

327 is for the knock sensor.

P0327
Descriptor
Probable Causes
Knock Sensor
Knock Sensor Circuit High Resistance
Knock Sensor Circuit Open
Knock Sensor Circuit Short to Ground
Knock Sensor Circuit Short to Voltage
Knock Sensor Intermittent Condition or Poor Connection
Powertrain Control Module (PCM)
Powertrain Control Module (PCM) Harness Poor Connection

P0133
Descriptor
Probable Causes
Evaporative Emission (EVAP) System
Exhaust System Leaking or Restricted
Fuel Pressure Incorrect
Heated Oxygen Sensor (HO2S) 1
Heated Oxygen Sensor (HO2S) 1 Harness Poor Connection
Heated Oxygen Sensor (HO2S) Contaminated
Heated Oxygen Sensor (HO2S) Wiring Harness
Powertrain Control Module (PCM)
Powertrain Control Module (PCM) Harness Poor Connection

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