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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-31-2007, 10:01 AM   #1
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hi i have a 321,no 18X ignition pulse??, and 361 EST line not toggling????my 94 sc seems to be running half power,with a ign coil miss at idle inconsistently???can anyone please help???thanx
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Old 05-31-2007, 12:29 PM   #2
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Sure...fix the problems....lol

(ok..maybe that was only funny to me.)

Any more description or info on the 361 est not toggling.. Not sure what the EST is...
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Old 05-31-2007, 12:32 PM   #3
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Electronic spark timing.

If you have no 18x ignition pulse, you will need to either replace the crank sensor, ICM, or repair the wiring. The 3x and 18x signals are picked up from the interruptor rings on the harmonic balancer by the crank sensor, then passed through the ICM to the PCM, then back to the ICM for spark timing/coil firing.
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Old 06-01-2007, 10:40 AM   #4
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thanxs for replying, i plan on changing the cam and crank sensor this morning,could this code be cause by my module??
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Old 06-01-2007, 10:41 AM   #5
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what is a ICM???,
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Old 06-01-2007, 11:02 AM   #6
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Ignition Control Moldule. It'* a thin part that sits directly under your coil packs.
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Old 06-01-2007, 11:14 AM   #7
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hi there,this 94 of mine doesn't like to start when it'* hot,,which makes me think it'* the module for the coilpack,i m in desparate need for a scanner, i live in ontario ,and have had no luckfinding one because it'* obd1 ecu,with obd2 plug,because of that know up here has one avail,for under $3,000(snap on),,help!,,,
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Old 06-02-2007, 05:00 PM   #8
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i was just about to pull of my harmonic balancer,when i noticed it was heavily cracked,would this partly be my problem???are the after market balancers worth the$$$.
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Old 06-02-2007, 05:13 PM   #9
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A bad balancer shouldn't affect the crank sensor signal. But sounds like a good time to replace it now. Does your engine make a hellacious clatter at idle?

And please please put your year and trim level in your signature.
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Old 06-02-2007, 05:33 PM   #10
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yes! it does make a clater but i had allways thought it was the sc coupler,,,does anyone have any experiences with after market harmonic???
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