MAP Sensor...Why am i missing it? - 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 08-03-2015, 09:32 PM   #1
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Lightbulb MAP Sensor...Why am i missing it?

so ive noticed that im missing something on my motor that i often see on the Series II 3800...same 95 Bonnie as usual....only thing is i had a motor put about 6 years ago...i dont even remember which series i had in the beggining...but it went out...a shop installed a motor out of a 99 grand prix....long story short...why am i missing the MAP set attaching pictures of what other 3800 have compared to mine...

The 1st two pictures are the way mines throttle body is set up...two that lead to the canister purge and trans vacuum modulator...out to fuel regulator...

the 2nd two pictures are set ups that i see whole in throttle body leading to MAP sensor, canister purge.
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Old 08-03-2015, 09:44 PM   #2
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95'* didn't have MAP sensors. 96 came with them I think. Or 97. Its part of the OBD 2 system. You have OBD 1.5.
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Old 04-04-2017, 09:54 AM   #3
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Default 1994 Series I Supercharged L67 with OBD 1.5 (94 Park Avenue Ultra)

Mike, it sounds like you might be the guy who can help me out. According to my local mechanics analyzer, my MAP sensor is failing, but we couldn't find it anywhere, and if I read what you wrote above, it doesn't even have one. I'm going to copy what I posted here the other day that completely describes my problem, hope you can help me sort it out. Thanks.
I have a 94 Park Avenue with the L67 engine that is running roughly between about 1700 and 2200 RPM. I live at 4K feet elevation but when I drive to to a lower elevation, > 1k, it does not do this, but when returning back up the hill, it starts in again at about 3k feet.

A few months ago I had this problem and took in to my local mechanic to check it out. He'* very good, but works from his home garage and doesn't have all the bells and whistles that a full blown commercial shop would. When we ran an analyzer it said the MAP sensor was failing, but after searching the internet for a diagram of the L67 we couldn't find one, and the diagrams we did find online that looked similar to my engine had nothing in the indicated locations for the sensor we had purchased from a nationally known auto parts chain. He recommended that I take it to a commercial shop and pay the usual hefty fee to have them analyze it. Fortunately, it stopped having the problem the next day when I drove it, which was good because funds have been tight lately due to my wife'* health issues.

However, it started acting up again about two weeks ago, and I need to resolve this as quickly and as cheaply as possible.

So my first question is does this sound like a MAP sensor issue, given the different behaviors at different altitudes?

Second, can someone PLEASE provide a link to a diagram of the L67 engine so I can where the MAP sensor is? The car has 122k miles on it, and the sensor is relatively inexpensive so I figure it couldn't hurt to replace it so I can eliminate it as a possible source of the problem. I am usually hell on wheels when it comes to finding things through Google, but I've just spent well over an hour looking for an L67 diagram and have had zero success.

Thanks in advance for your help.
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