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#4572026 - 11/12/17 04:57 PM Code p0401, 98 lesabre,broken map sensor?
ziggy Offline


Registered: 08/08/05
Posts: 1491
Loc: stamford, CT
Hi again all! Well,finished installing new plenum on the engibe,no leaks. Performance kit,came with new pcv valve,it's housing,spring. It was a pita too get on! The reason...didn't come with a new orange o ring gasket,and thie r was a smaller one,in the pcv valve. I used the old gaskets. The housing didn't wanna close unless the large o ring was out. Use a ratchet, and a sicket, and pressed hard,and turned. I'm assuming,I want supposed too have a o ring gasket thier,correct?
Well,upon starting car no codes. Looked like steam coming out of tailpipe as it warned up the map sensor,sits on top the pcv valve, had come off,in 2 pieces. I put them back together,and installed.the bottom half,was just plastic,and a Tiny Hole In It. So Get A Code...p0401. Something Airflow Inefficient. Did Some GOogling,and the Map SEnsor Comes Up. Could I Just Krazy GLue THe halves OF sensor BAck TOgether? Or Replace IT? When I Took IT out,it already felt FLimsy.


Edited by ziggy (11/12/17 05:00 PM)

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#4572056 - 11/12/17 05:27 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
Are you feeling OK? Is your keyboard feeling OK? crackmeup

I guess you can glue it, clear the codes, and see what happens if you want. I wouldn't if it was the car that I rely on to get to work. shrug

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#4572069 - 11/12/17 05:41 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
I had a MAP sensor come apart on a '98 LeSabre earlier this year and wound up replacing it a few months later after it started throwing a code.

The computer takes data from, among other things, the MAP sensor to control how hard the transmission shifts, so a tired or broken MAP sensor isn't going to do your transmission any favors.
_________________________
I like Chevy and Valvoline.

'13 Cruze, 1.4T, 112K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 167K
'67 Suburban, 350, 331K

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#4572084 - 11/12/17 05:58 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
Ihatetochangeoil Offline


Registered: 10/28/14
Posts: 580
Loc: On the road Midwest
Replace it. Period. No matter where you buy it from, get a Hitachi, which is OEM.

https://www.ebay.com/itm/Mass-Air-Flow-Sensor-fits-1996-1998-Pontiac-
Bonneville-Firebird-Bonneville-Grand/132383780129?fits=Year%3A1998%7CModel%3ALeSabre&epid=112831924&hash=item1ed2b02d21:g:fJcAAOSweM1Z-~zG&vxp=mtr

This is 1999 and later: https://zzperformance.com/3800/air-intake/99-maf-sensor.html


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#4572139 - 11/12/17 06:44 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
eljefino Offline


Registered: 06/15/03
Posts: 32628
Loc: ME
MAP, not a MAF, though this car uses both.

If you busted it, replace it. Should be cheap enough.

It might drive better with it unplugged than plugged in and faulty, until such time as you can replace it.

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#4572144 - 11/12/17 06:52 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: Alex_V]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: Alex_V
The computer takes data from, among other things, the MAP sensor to control how hard the transmission shifts, so a tired or broken MAP sensor isn't going to do your transmission any favors.


It's the only way for the computer to know the car is under load. Without the MAP sensor working correctly, the car will not accelerate and will not downshift. You can push the throttle all the way to the floor and nothing will happen. That was my experience with my Buick 3800.

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#4572193 - 11/12/17 07:29 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
ziggy Offline


Registered: 08/08/05
Posts: 1491
Loc: stamford, CT
Made a mistake! It's p 0108!vel came back on,and this time, I brought code scanner with me. Map or maf,high outout,somethinganother.
Is that due too the map sensor?or something else? Again!it's code p0108

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#4572196 - 11/12/17 07:29 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
ziggy Offline


Registered: 08/08/05
Posts: 1491
Loc: stamford, CT
Made a mistake! It's p 0108!vel came back on,and this time, I brought code scanner with me. Map or maf,high outout,somethinganother.
Is that due too the map sensor?or something else? Again!it's code p0108

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#4572197 - 11/12/17 07:30 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
ziggy Offline


Registered: 08/08/05
Posts: 1491
Loc: stamford, CT
Advance auto has one,for $53. Stop thier tomorrow.

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#4572211 - 11/12/17 07:49 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
eljefino Offline


Registered: 06/15/03
Posts: 32628
Loc: ME
If you broke your MAP your computer might use it to self-check the MAF. You know what you broke, don't bark up the wrong tree.

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#4572220 - 11/12/17 07:55 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
ziggy - You can push down hard on that PCV housing cover by using a 16mm socket attached to a 3/8 drive spin handle. Push down, turn, and lock.





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#4572286 - 11/12/17 09:20 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
This is the setup I use for pressing down on the spring loaded PCV cover: THIS + THIS

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#4580040 - 11/20/17 11:57 AM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
ziggy Offline


Registered: 08/08/05
Posts: 1491
Loc: stamford, CT
Got a new sensor,advance auto,works fine. Did the upper pkenum,gasket,no leaks.torqued those bolts down real good.but..the p0420 code popped back on. Got 2 new a.c. Delco 92 sensors. Gonna install tomorrow.bubba try carb cleaner in 92 hole,distilled water via throttle body,and laque r thinner,a gallon too half a tank .

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#4580041 - 11/20/17 11:59 AM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
ziggy Offline


Registered: 08/08/05
Posts: 1491
Loc: stamford, CT
That housing,for the pc v valve was a pita! Used an extension,ratchet and socket too hold it down HARd on the street,turned it making sure both sides locked.it had a habit of one side locking took me more than 25 minutes.

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#4580116 - 11/20/17 01:49 PM Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: ziggy
That housing,for the pc v valve was a pita! Used an extension,ratchet and socket too hold it down HARd on the street,turned it making sure both sides locked.it had a habit of one side locking took me more than 25 minutes.


You have to get the downward pressure centered; that's why a spin handle works better because you can't get the pressure centered with a ratchet. I think I might even use both hands on the spin handle because the spring is so strong.

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