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Code p0401, 98 lesabre,broken map sensor? #4572026
11/12/17 04:57 PM
11/12/17 04:57 PM
Joined: Aug 2005
Posts: 1,546
stamford, CT
ziggy Offline OP
ziggy  Offline OP
Joined: Aug 2005
Posts: 1,546
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.

Last edited by ziggy; 11/12/17 05:00 PM.
Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572056
11/12/17 05:27 PM
11/12/17 05:27 PM
Joined: Dec 2014
Posts: 1,684
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,684
'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

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572069
11/12/17 05:41 PM
11/12/17 05:41 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
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.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572084
11/12/17 05:58 PM
11/12/17 05:58 PM
Joined: Oct 2014
Posts: 590
On the road Midwest
Ihatetochangeoil Offline
Ihatetochangeoil  Offline
Joined: Oct 2014
Posts: 590
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


Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572139
11/12/17 06:44 PM
11/12/17 06:44 PM
Joined: Jun 2003
Posts: 33,559
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,559
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.

Re: Code p0401, 98 lesabre,broken map sensor? [Re: Alex_V] #4572144
11/12/17 06:52 PM
11/12/17 06:52 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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.

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572193
11/12/17 07:29 PM
11/12/17 07:29 PM
Joined: Aug 2005
Posts: 1,546
stamford, CT
ziggy Offline OP
ziggy  Offline OP
Joined: Aug 2005
Posts: 1,546
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

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572196
11/12/17 07:29 PM
11/12/17 07:29 PM
Joined: Aug 2005
Posts: 1,546
stamford, CT
ziggy Offline OP
ziggy  Offline OP
Joined: Aug 2005
Posts: 1,546
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

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572197
11/12/17 07:30 PM
11/12/17 07:30 PM
Joined: Aug 2005
Posts: 1,546
stamford, CT
ziggy Offline OP
ziggy  Offline OP
Joined: Aug 2005
Posts: 1,546
stamford, CT
Advance auto has one,for $53. Stop thier tomorrow.

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572211
11/12/17 07:49 PM
11/12/17 07:49 PM
Joined: Jun 2003
Posts: 33,559
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,559
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.

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572220
11/12/17 07:55 PM
11/12/17 07:55 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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.





Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4572286
11/12/17 09:20 PM
11/12/17 09:20 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
This is the setup I use for pressing down on the spring loaded PCV cover: THIS + THIS

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4580040
11/20/17 11:57 AM
11/20/17 11:57 AM
Joined: Aug 2005
Posts: 1,546
stamford, CT
ziggy Offline OP
ziggy  Offline OP
Joined: Aug 2005
Posts: 1,546
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 .

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4580041
11/20/17 11:59 AM
11/20/17 11:59 AM
Joined: Aug 2005
Posts: 1,546
stamford, CT
ziggy Offline OP
ziggy  Offline OP
Joined: Aug 2005
Posts: 1,546
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.

Re: Code p0401, 98 lesabre,broken map sensor? [Re: ziggy] #4580116
11/20/17 01:49 PM
11/20/17 01:49 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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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