2002 Chevrolet Cavalier No spark and No fuel

Tiny
JAKET
  • MEMBER
  • 2002 CHEVROLET CAVALIER
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
I have replaced the PCM. There is no power to the fuel pump. If I bypass the fuel pump relay the pump runs, but still won't start because it has no spark.
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Tuesday, July 22nd, 2014 AT 3:14 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
Forget the fuel pump. That had better not be running unless the engine is rotating. Look for the cause of the no spark. That's not going to be an ignition system problem when you couple it with the dead fuel system. What they both have in common is being turned on by the Engine Computer when it sees the engine rotating, and it knows that by the signals from the camshaft position sensor and the crankshaft position sensor.

The place to start is by reading the stored diagnostic fault codes. If there's one related to one of those sensors, that's the circuit that needs to be diagnosed further. The actual sensor is the cause of the problem about half of the time. There can also be wiring and connector problems to consider.

Replacing the Engine Computer as a guess erased all the valuable information stored in it, and some fault codes won't set again just from cranking the engine. If there are no fault codes, you'll need a scanner to view live data to see if one of those signals is missing.
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Tuesday, July 22nd, 2014 AT 3:54 PM
Tiny
JAKET
  • MEMBER
I will check out those sensors. But you still should hear the fuel pump kick on when you first turn the key on. Right? I had no codes in the old pcm.
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Tuesday, July 22nd, 2014 AT 4:21 PM
Tiny
CARADIODOC
  • EXPERT
Typically the fuel pump will run for one second when you turn on the ignition switch, and GM pumps are pretty noisy and easy to hear, but I wouldn't rely on that for a diagnosis. Get the spark back and I'll bet the fuel pump is back to normal too.
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Tuesday, July 22nd, 2014 AT 4:47 PM
Tiny
JAKET
  • MEMBER
I took it into the mechanic and I had a broken power wire that goes to the pcm.
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Sunday, August 3rd, 2014 AT 5:31 AM
Tiny
CARADIODOC
  • EXPERT
Dandy. Happy to hear it's solved.
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Sunday, August 3rd, 2014 AT 8:15 PM

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