95 Buick Park Avenue stumbles under load when warm (Fixed) - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-13-2011, 12:14 AM   #21
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Does this have the Series I or the Series II in it? If it is the Series I, it will just say 3800 Tuned Port Injection on the cover, if it is a Series II, it will say Series II. Other question is the coolant. Is it pink/red, or green?
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Old 05-13-2011, 12:22 AM   #22
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the engine cover says 3800 series II. The coolant is green. The oil is not milky. The only thing I've noticed is some oil puddling up in front of and below the intake (also in front of and below the injectors).
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Old 05-13-2011, 12:28 AM   #23
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The Actron 9145 scanner does live scans. I just saw one on Ebay for $59.00. You would need to purchase the adapter for your vehicle but well worth the money. FYI
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Old 05-13-2011, 12:28 AM   #24
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Any oil in that area is from valve cover gaskets.
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Old 05-13-2011, 12:36 AM   #25
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Thanks again Dan. Also, I never thanked you for the post about checking the coils. I didn't realize that was your post that Randall gave me the link to. So thanks for that as well.

Changing the valve cover gaskets shouldn't be too hard. Of course, I'm not looking under the hood right now. Either way, I think I'll take a break from working on it for a week or two.
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Old 05-13-2011, 12:38 AM   #26
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Your very welcome.

Changing the gaskets are not to hard. The front is real easy, the rear is a bit more involved, several things in the way. But all in all, not real hard.
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Old 05-13-2011, 12:39 AM   #27
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Thanks for the tip CRECE. I looked at the Actron scanners. Most of them don't seem to work on my OBD 1.5 system although I did see one in a brochure that looked like it would work.
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Old 05-13-2011, 08:00 AM   #28
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You're welcome. I use the Actron on my 95 Bonnie and my 94 Park Ave. Both are Series I Obd 1.5 and it has save me a lot of money.
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Old 07-22-2013, 04:05 PM   #29
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Quote:
Originally Posted by chassc View Post
I've got a Buick Park Avenue with the 3.8 that stumbles under load. Usually happens after the engine is warmed up. Seems to get worse on a hot day above 80. Generally happens at low RPM'* in 4th gear going up a hill but can happen in 2nd or 3rd gear. Sometimes it will backfire a few times while stumbling. When you step into the throttle enough it usually cleans up and runs better. Have not seen any black or blue smoke when it happens.

So far I have replaced the spark plugs, the plug wires, the oxygen sensor, the crankshaft position sensor, the mass airflow sensor, the fuel filter and the throttle position sensor. Have also checked the air filter. The engine does not seem to have a manifold absolute pressure sensor. The car is equipped with OBD 1.5 which means the engine is OBD 1 and the under dash connector is the OBD 2 type. The check engine light does not come on. I disconnected the battery a few weeks ago which cleared the computer. Not sure if a code would turn up anyway. The coil packs look good upon inspection but have not tried replacing any of them yet.

Looking for suggestions of what to check next.
I basically had the same problems. Mine wouldn't start when warmed up, and idled bad.
has the fuel pump pressure tested. It came up to 28-29 lbs key on only, and struggled to do that. It'* supposed to be 40-47. Replaced the fuel pump and problem solved.
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1995, 95, avenue, bad coil, buick, defective coil, hot, ignition issue, misfire, park, stumble, stumble when hot, stumble when warm, warm

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