Frequent Stalling - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-07-2015, 12:05 PM   #11
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Generally this stuff is a no brainer, but I was just diagnosing and getting parts based on what I was told over the phone from my dad. The last time the regulator had been replaced he said the car had ran great for about 5 months. But based on what I told, I just got the other parts to rule them out. Why not? Had already replaced the regulator so it didn't come to mind. Worst part is, I sell parts for a living and get parts cheap. So now I'm having to pay high dollar for it. Hope this what it is.
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Old 05-07-2015, 01:55 PM   #12
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You may have a bad ECM (Engine Control Module). I had a very similar problem a number of years ago with a '94 Olds LSS. In my case, it would often stall going down the road. Before it started stalling frequently, the cruise control quit working. Replacing the ECM brought that back as well.
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Old 05-07-2015, 05:08 PM   #13
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Changed out the regulator. It helped a little, but it'* still dying. Getting surging like the IAC is out of adjustment. I'm going to check that and reset the ECM. If not, I guess I could burn it to the ground.
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Old 05-11-2015, 10:24 PM   #14
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You would probably do well to take it to a good mechanic to find the actual problem, but with that said........you did not mention the crankshaft position sensor. They are famous for causing trouble on 3800s. They are especially troublesome when the car is warmed up. Once cooled, they often work for a while, then crap out again when they get too hot. They don't always leave a code when they fail.
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Old 05-12-2015, 11:33 PM   #15
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After further investigating, I learned that the catalytic converter was clogged and punched out at the start of this whole ordeal. The clogged cat had created an issue with the icm and coils which did test bad. I do have a code for the O2 sensors. I'm thinking how heavily reliant 96 and newer cars are on a consistent reading from the O2 sensor for the adjusting of air/fuel ratio. That and the lack of back pressure from the punched converter may be where the whole issue is coming from. The crank sensor did cross my mind, but the lack of necessary tools and the part not available, I focused on what I could do. However, I'm off the island and not much I can do from here other than ship him parts. I really do appreciate all of the suggestions. Thanks and God Bless
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