95 Bonneville with starting/ running issues - Page 6 - 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 12-20-2013, 10:00 PM   #51
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Even if we did have all the correct sensors and everything hooked up correctly, we wouldn't even know if a sensor was bad unless we scanned the car for that active code that keeps popping up.
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Old 12-21-2013, 09:54 AM   #52
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BTW, what is the thing on the oil pan that looks like a plug, but has wires going to it? Mine is not plugged in, nor do I see wires hanging that should go there. At the yard I see 3800s with that thing plugged in. My diagram shows 'oil life monitor reset switch', which is all I can figure out. Does my '95 have it, or is it a remnant of the engine swap? Guess I'll see if the '95s at the yard have it today, but I have no clue if that could cause CEL,

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Old 12-21-2013, 10:48 AM   #53
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Thread moved to Bonneville section and thread title updated.
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Old 12-21-2013, 03:35 PM   #54
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Okay; '95 Bonnevilles at the yard had a different thing in the pan, different connector than the one on my swapped engine. I recognize the plug as one I couldn't figure out on my harness, and was thinking it was A/C. Now I know. Couldn't get the knock sensors, nor the oil pan plug, but got a vacuum piece to the EVAP canister that has been a problem. --

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Old 12-21-2013, 09:26 PM   #55
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That is a oil LEVEL sensor. Surprised your oil level light isn't illuminated. Of course, its probably wired that if its disconnected, it won't do anything(which is stupid).
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Old 12-21-2013, 10:22 PM   #56
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Wow; thanks. Ok, so I have both an oil pressure gauge (which is showing good), and a low level gauge. That explains it!

You know, that fuel pump relay being bypassed keeps sparking something...circuit 465 connects the PCM to the relay, 'fuel pump relay control'. Circuit 839 is also pegged to that relay. So both of these circuits are bypassed currently. As my CEL is still on, I have nothing to lose by wiring up the relay with separate wires if the socket is shot, seeing if the engine will run, and if it does, if the CEL goes out. --

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Old 12-21-2013, 11:23 PM   #57
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and taking a closer look at the diagram, the oil pressure sender is involved with 839 too. Odd; the relay circuit numbers seem backwards...circuit 30 is apparently shown as switched output to the fuel pump. On other cars I've worked on, 30 is normally always-on 12V (battery)...87 looks more like 12V switched here, which is bizarre to me...anybody?

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Old 12-22-2013, 05:42 AM   #58
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What diagram?
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Old 12-22-2013, 10:58 AM   #59
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This is the wiring diagram my tech guy printed out, focused on the PCM connections on '95 Bonnie. It'* AllData and it'* apparently what the pros use.

So, it does not show that low oil level light circuitry, apparently because that does not involve the PCM. --

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Old 12-22-2013, 10:01 PM   #60
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I think its right. The 95'* didn't have the oil level circuit in them. Which means, you have a newer engine. How to determine what year it is by the stamping on the block is beyond me.

You might get close if you check the date stamp on top of the black plastic intake plenum.
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