1991 Buick Century engine dies after warm up

Tiny
CARBOW
  • MEMBER
  • 1991 BUICK CENTURY
Engine Performance problem
1991 Buick Century 6 cyl Front Wheel Drive 200k miles

I have a 91 century w/3300 it starts and runs for about 15 minutes then dies, starts again after it cools. The ignition module, coils and e.C.M. Have been replaced. Fuel pressure seems to be ok
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Thursday, October 9th, 2008 AT 8:15 PM

5 Replies

Tiny
JDL
  • EXPERT
Are there any codes? When it refuses to start, have somebody crank it, while you check for spark and injector pulse, that should tell you if there is an rpm signal.

When it dies, can you tell if the fuel system was too rich or lean.
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Saturday, October 11th, 2008 AT 9:09 AM
Tiny
CARBOW
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It has no spark after shut down. The codes I got were 26 & 42
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Saturday, October 11th, 2008 AT 12:32 PM
Tiny
JDL
  • EXPERT
26 is a quad driver fault and 42 is est circuit problem.

I'd still check the crank sensor circuits, first. I'm not saying replace the sensor, I'd have to make sure there is an rpm signal.
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Saturday, October 11th, 2008 AT 5:07 PM
Tiny
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How do I check for rpm signal?
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Sunday, October 12th, 2008 AT 12:03 PM
Tiny
JDL
  • EXPERT
If you have a scanner or can borrow one, with the engine cranking, it should show if there is an rpm signal.

You said you didn't have spark, after it dies, if there is an injector pulse with the engine cranking, then there should be an rpm signal.

The purple/white wire and white wire at the ignition module, should have a pulse on them, with the engine cranking. If you have a digital multimeter with a tach--dwell-- duty cycle setting, any of these settings should react to a pulse. I believe radioshack has a digital logic probe that will react to a pulse.

You might be able to check for voltage on the coil side of the fuel pump relay, with engine cranking. I don't believe there would be voltage on the coil side without an rpm signal.
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Sunday, October 12th, 2008 AT 2:40 PM

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