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97 Bonneville P0300 and P0171

Old 03-18-2010, 04:26 PM
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hey guys thanks for the input, havent had much time to take a look at things myselft but luckily I was able to get it to a dealer and have it checked for free. Here'* what they found: Misfires on cylinders 3 and 6 - no spark on those. Ignition control module is apparently causing the misfires. How much would one of these run or does anyone happen to have an extra one?
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Old 03-18-2010, 04:56 PM
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3-6 would be a bad coil. Not the ICM
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Old 03-18-2010, 05:23 PM
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hmmmm well i did swap that coil with a brand new one and there was no change at all. if the misfire is random/multiple couldn't the ICM still be at fault?
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Old 03-18-2010, 05:25 PM
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if i remember correctly i may have a spare ICM around somewhere so ill try swapping if I come across it
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Old 03-18-2010, 09:26 PM
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Originally Posted by Danthurs View Post
3-6 would be a bad coil. Not the ICM
Typically yes, however a bad ICM can keep the coil from firing. A GM dealership would have the equipment to test an ICM properly... versus an autozone/advance that tests them and gets suspect results.
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Old 03-18-2010, 09:29 PM
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If you swapped coils, then check the tabs on the ICM. If one of those tabs is damaged then you will need to change out the ICM.
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Old 03-19-2010, 09:48 PM
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Good thinking, I almost missed that. I will check the tabs tomorrow. No luck on finding the spare ICM. Does anyone have an extra willing to sell?
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Old 03-29-2010, 12:24 PM
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Finally got the new ICM and installed it yesterday. Car runs much better but there is still a ticking sound. I believe I have a bent pushrod according to the dealers diagnosis. How difficult is it to change out a pushrod? I opended up the valve cover yesterday to take a look and I think I will attempt this once I can order a new push rod.
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Old 03-29-2010, 12:27 PM
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I have a few used sets of pushrods laying around if you are looking for a low cost set.

Pushrods are relatively easy. Pull the valve covers, remove the rockers, then the pushrods can be removed and replaced. Using reusable rocker bolts, reassemble.

Oh..BTW, I have those too. Your stock bolts are torque to yield and are not reusable.
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Old 03-29-2010, 04:51 PM
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Bill make sure your "spare" parts are not what he needs. Did we notice what kind of engine he has. Or does this not make a difference what he has referencing the pushrods?
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