engine misfire only on uphill 1995 Pontiac Bonneville 3.8 series II SE - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-18-2014, 08:10 AM   #11
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Thanks Justin, will get supplies today.
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Old 02-18-2014, 09:51 AM   #12
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copper 30k miles
platinum 60k miles
iridium 100k miles
cheap plug wires last about just as long as copper plugs if your lucky.
although most lifetime warranty plugs wires never need to be changed unless u do have a bad wire. do a cylinder balance test. pull one plug off one by one and make sure it stumbles when wire is removed.
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Old 02-18-2014, 01:36 PM   #13
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Thanks Travis, I was just about to buy copper plugs.
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Old 02-18-2014, 01:46 PM   #14
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copper plugs and NA-3800'* do not mix it will run rougher than crap. platinum is minimum for that engine
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Old 02-18-2014, 02:07 PM   #15
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Those are manufacturer changing intervals for those plugs. I usually take them out 5k sooner. I wouldn't ever wanna run to the full service interval.. But that'* just me! And don't forget ur antiseize!!!
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Old 02-18-2014, 02:10 PM   #16
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the 3800 doesnt like copper they will run like junk from new
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Old 02-18-2014, 03:45 PM   #17
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Gee guys, you have made my day! I'm glad I decided to wait until tomorrow morning to get the parts. Been spending my day looking at videos on utube showing how to clean the ICM module; have noticed in the past that when the engine warmed it would not have the same responses as when it was cold; have thought it was computer running in open mode or trany problems but now I am anxious to see the condition of my ICM.
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Old 02-18-2014, 04:25 PM   #18
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Quote:
Originally Posted by Acer View Post
Thanks William, but I need a little help on the location of the ICM, and coil packs. I assume that the coil packs are where the plug wires originate, in my case in the front of the engine, but where is the ICM? I know, or think I know where the MAF is located. Is MAF cleaner like Gumout, carb cleaner?
The misfire seems to be random. There is sometimes a sneeze, like backfire thru the intake. The misfire clears after about half a city block and has good power; sometimes returns and sometimes doesn't. I am going to work on the car Wednesday as temps will be around 70.
For the MAF this is what you want, CRC MAFCleaner.


Here is a link from a site we are pretty friendly with, a buddy of mine over there posted some good pics of the process, only this is he used a q-tip, and carb cleaner, which you could do, but the o ring on the MAF, and the plastic housing could be damaged if you get the carb cleaner on it, so just use MAF cleaner to clean it.
MAF sensor cleaning - 3800Pro.com Forum



Have you removed the EVAP line from the fuel pressure regulator and seen if it smells like gas, or leaks gas?
Watch this video, the part you want starts at around 1:50 so you can skip ahead if you want.


Question, you have not been loosing a lot of coolant have you?
I ask because if you have never had your LIM Gaskets changed to the aluminum framed gaskets, then chances are you could be leaking a little coolant into your cylinders, if you are not and the gasket has never been changed, then it is something I highly recommend doing if you plan to keep the car for a long time.
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Old 02-18-2014, 04:56 PM   #19
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That'* false advertising...



Your not GAINING anything, just RECOVERING what was lost due to signal dissipation because of dirt build up on the sensors.
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Old 02-18-2014, 05:21 PM   #20
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semantics
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