LT1-LT4 Modifications 1993-97 Gen II Small Block V8

need help!!!

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Old Sep 17, 2006 | 05:54 PM
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dropped94formula's Avatar
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ok i have a 94 formula that i just got done installing a new motor, stock heads stroked and 305 cam, USED opti. its throwing these 2 codes

16 A low resolution pulse was not detected by ECM within 720 high resolution timing pulses.

36 ECM detected less than 40 high resolution timing pulses between each low resolution pulse for 5 consecutive cycles.

any ideas? thanks for the help, much needed

p.s. it also will idle down to 500 rpm and die a bit after, its also hard to start.
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Old Sep 17, 2006 | 11:12 PM
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ttt also wouldnt start for a while, then disconnected the coil wire (4 prong above the intake) and started right up, anyone????
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Old Sep 18, 2006 | 12:14 PM
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ttt anyone???
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Old Sep 18, 2006 | 12:29 PM
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Not exactly sure but maybe you should check your knock sensor, and if you haven't already change the lt1 to a lt4 knock module in the computer
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Old Sep 18, 2006 | 01:33 PM
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ignition controll module, try that first. if the car runs great until it heats up and is throwing them codes its prob the icm.
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Old Sep 19, 2006 | 12:06 PM
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thanks ill try those two out. any other ideas?
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Old Sep 19, 2006 | 12:12 PM
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Check your opti wire harness connections.
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