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Old 08-24-2005, 11:45 AM   #1
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Default Troubleshooting tips on the sonoma 4.3

Cranks fine, no start, doesn't even try to fire.
Wire and plug on ign coil, gets 1 spark when cranking started and 1 spark when stopping cranking. Replaced ICM, dist cap and rotor. FSM says three seperate ohms readings on ign coil, all three check out. Pick-up coil checks out at 800 ohms.
Suggestions?
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Old 08-24-2005, 12:23 PM   #2
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Assuming the motor is good and we can.. there'* only two other things you need.

Spark and fuel. Sounds like you have spark.
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Old 08-24-2005, 12:53 PM   #3
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we don't have spark. Haynes says if you only get 1 spark, it'* called a no spark condition. there is 12v at the ign coil, coil ohms good. the "C" and "+" terminals at the ign coil have 11.5v with ign on. Short of just throwing a new coil in for wasting money'* sake, I'm at a lose.
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Old 08-24-2005, 01:30 PM   #4
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Hmmm did something happen to the crank sensor?
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Old 08-24-2005, 01:43 PM   #5
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no crank sensor, old school engine. That'* what so frustrating. It'* not that difficult.
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Old 08-24-2005, 03:31 PM   #6
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Quote:
Originally Posted by sonoma_zr2
no crank sensor, old school engine. That'* what so frustrating. It'* not that difficult.
Do you by chance have one of those distributors laying around...? And your right its oldschool, it still does use the ECM, but it should still spark... I'm lost as well

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Old 08-24-2005, 03:44 PM   #7
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by sonoma_zr2
no crank sensor, old school engine. That'* what so frustrating. It'* not that difficult.
Do you by chance have one of those distributors laying around...? And your right its oldschool, it still does use the ECM, but it should still spark... I'm lost as well
Do you want one?

Looking at the schematic, the ICM is attached to the ECM by 4 wires ( IC, REF HI, REF LOW, IGN BY) Going to try to find an ECM from a doner truck.
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Old 08-24-2005, 04:10 PM   #8
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I have a 91 Sonoma as my daily beater with a 4.3 series Z engine.

Let me look tonight at my wiring diagram. That being said there was a big difference from the 91 to 92 model years.
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Old 08-24-2005, 04:28 PM   #9
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Quote:
Originally Posted by sonoma_zr2
Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by sonoma_zr2
no crank sensor, old school engine. That'* what so frustrating. It'* not that difficult.
Do you by chance have one of those distributors laying around...? And your right its oldschool, it still does use the ECM, but it should still spark... I'm lost as well
Do you want one?

Looking at the schematic, the ICM is attached to the ECM by 4 wires ( IC, REF HI, REF LOW, IGN BY) Going to try to find an ECM from a doner truck.
Thats another possibility... I haven't seen too many of those ECM'* fail... Maybe 1 or 2...

I will hazzard a guess and say that this is the Central Port Injection HO 4.3?

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Old 08-24-2005, 04:31 PM   #10
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Mmm is that lil module in the base of the distributor??? give that a check if you have one. I've seen those go bad. No module no sparkie
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