95 Buick Park Avenue stumbles under load when warm (Fixed) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-11-2011, 10:01 PM   #11
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48 misfire diagnosis

Not sure if it flashes, now that you mention it.
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Old 05-11-2011, 10:16 PM   #12
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Quote:
Originally Posted by rjolly87 View Post
I am pretty sure he was referring to the Crankshaft Position Sensor, I failed to mention which poster I was addressing with my reply regarding it.

Also, when testing the coils, you also are looking for consistancy in the readings, as well as a reading in a specific range (mentioned in the link). Ideally, all 3 coils should have the same readings. If it already seems a little off, I would expect the problem to be apparent when hot. As was mentioned, you can easily source these from junkyards, and if you bring your multimeter with you, test them as you pull them off of the donor car.
Guys its been so long ago I dont remember, I know it at the center of eng and very hard to see, had to remove alt to replace, mine was intermitent. It was alittle bigger than a qarter.

Water on the sensor when it was warm to cool it was a good way to test for this! It dont cost you nothing and its fast! Sence the part is new I wouldent expect it, but you never know.

Good Luck!
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Old 05-12-2011, 11:17 PM   #13
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Tested the coils with the multimeter again today when the car was hot. The readings DID change from cold to hot on both the primary and secondary. None were completely out of range but two were close. Went and bought two coils and put them in. No improvement. Replaced the third coil and that cured the problem. No stumbling at any RPM in any gear.

On the one hand, it'* a shame to have replaced so many parts to find the problem. On the other hand, could have easily spent that much or more getting it done at a shop.

Thanks again for all the helpful suggestions!
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Old 05-12-2011, 11:25 PM   #14
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On the plus side, you learned a lot, and that will make the next job just a little easier.
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Old 05-12-2011, 11:33 PM   #15
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That'* true, I did learn a lot about the 3.8. More than I ever wanted to know...
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Old 05-12-2011, 11:39 PM   #16
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In all honesty, 5 of the 7 items replaced are considered maintenance items anyway, number 6 you indicated a known issue with, so that leaves you with just the Mass Airflow Sensor replaced possibly unnecessarily. I think that is pretty good.

Glad you got it fixed!
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Old 05-12-2011, 11:44 PM   #17
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I try to stay away from swapnostics. That'* why I like to test everything. Testing is cheep.
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Old 05-12-2011, 11:57 PM   #18
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Good point Randall. The vehicle mileage is low at 75,000 miles but it is old. Overall, money well spent and less things to worry about or replace in the future. I feel like I could get in it and drive cross country and not have any worries.

I was getting concerned about the "swapnostics" as well. At least it didn't get too out of hand.
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Old 05-13-2011, 12:01 AM   #19
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Trust me, there have been people in the past that have replaced part after part after part and still having problems. What you replaced is fine.
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Old 05-13-2011, 12:10 AM   #20
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It'* my dads car. He'* happy, so that makes me happy.

What I'll be keeping my eye on now is the intake manifold. Been reading some horrible things about those going bad and having problems with the gaskets.

I think I'll be leaving the plastic engine cover off for the time being.
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