Random/multiple misfire, cylinder # 3 - 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 02-23-2006, 02:02 PM   #11
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Originally Posted by 1993 SLE
get that code scanned, even tho the light is off the code can still be stored in the PCM.....that will tell us somemore info on what is going on
Pat..he'* still sitting on the same code. I think the best approach is to swap the coils around and see if the problem follows a specific coil. If not, check your battery connections for any corrosion or poor contact, also the connection for the ignition control module below the coils.

These cars are quite sensitive to voltage changes and do not like corrision on any connections. (I bought a tube of dielectric grease since owning a b'ville..and use it all the time.)
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Old 02-23-2006, 10:35 PM   #12
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Update: Got a chance to get over to autozone today. They scanned it and what do ya know, found another code stored. P0171 was there, and the misfire as well. The lady that checked it mentioned that if it were her she would look into a new O2 sensor. If i understand right there are 2 on my car? I know about the one on the back of the engine where the exaust comes out but is the other underneath then ? Since the plugs + wires werent even changed at 100,000 like they were supposed to be (i got it at about 110K), it seems that the 02 sensor is past due for replacement. And can i get it out with just a regular wrench or do i have to use the special socket. Thanks to everyone for the input so far.
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Old 02-23-2006, 10:45 PM   #13
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O2 Sensor info
Read that from TECHINFO

And yes, you can use regular tools, it'* just tight. Or buy a special wrench for about $15.

EDIT: Here'* another thread that discusses this from earlier today:
http://www.bonnevilleclub.com/forum/...ic.php?t=49157
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Old 02-24-2006, 09:37 AM   #14
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You still need to fix the misfire , did you swap coils around .
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Old 02-28-2006, 12:08 PM   #15
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Finally had time to swap the coils. Didnt get any change when i did however. Could they all be bad ? Because i am getting a random/multiple misfire code still. This weekend ill test them with a multimeter to make sure they arent bad.
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Old 02-28-2006, 12:14 PM   #16
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Please use the coil pack troubleshooting Techinfo article and report your primary and secondary resistances back here. Look for corrosion on the posts of the secondaries.

Check the resistance of each plug wire and report them back here.

What did you gap your plugs to, and what do they look like today? Pull the front three.
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Old 02-28-2006, 12:16 PM   #17
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Also...what brand of plug wire did you use.
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Old 03-03-2006, 05:38 PM   #18
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Last year my bonne threw a misfire code. It was intermittant It had 60k on it so I changed plugs and wires. It happened again and it was same cyl as before. I swapped that cyl injector with the one next to it. About a week later it threw the misfire code but now on the other cyl so I new it was the inj. When it failed I could tap it with screwdriver handle and it would come back to life. I replace the one inj with an GM on and no problems since knock on wood. Just something else besides ignition to look at.
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Old 03-04-2006, 11:38 PM   #19
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Checked resistance on coils today, secondaries came up around 6,000 ohms. But when we tried the primaries we got nothing at all.......used pieces of wire just like it is shown in the techinfo article. Also checked some plug wires, one was burnt on the end and another broke on the tip. Plugs were gapped at .60, just how they came. The wires are Duralast, very poor quality if you ask me. Which brand should i go with for new ones ? I hear that napa sells good plug wires.
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Old 03-06-2006, 11:51 AM   #20
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Napa Beldans are good wires. What brand and type of plugs did you have in there? Remember that Bosch plugs do NOT work well in our cars for some reason.
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