1992 Bonneville - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-03-2006, 09:40 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jul 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Lord_GalAthon is on a distinguished road
Default 1992 Bonneville

Greetings all, so my sister enherited our late dad'* '92 Bonnevile SE. It'* in great shape and after she got her driver'* licence she started using it regularly. Our mom let it sit in the driveway for over a full year.

It started stalling at lights and throwing an SES last week.

I scanned with the GM tool, and got the MAF sensor (34). I performed all the regular maintenance on it today, spark plugs, oil change, fluids, cleaned the intake/throttle body. I checked the air filter and it seems ok.

The car still runs low idle but only stalled once on a 10 mile test drive I took it on, I disconnected the sensor that'* on the air filter box thinking it might be the MAF (although I suspect the maf is the rectangular black box, held in place with three screws, on right after the plastic ends on the intake, on the metallic part which I guess is the very start of the throttle body...) and after disconnecting it, the car ran better and no longer stalls.

My questions are:

Which one is the MAF sensor and how much are we looking at for a replacement.

The car has just over 150.000kms on it.

Thanks and congrates for the fantastic forum site.
Lord_GalAthon is offline   Reply With Quote
Old 07-03-2006, 09:47 PM   #2
Junior Member
 
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville92V688 is on a distinguished road
Default

The MAF is the black rectangular box. Replace it with a working one from a scrapyard. New they run about 100-140 bucks. Oh yeah, and welcome!
Bonneville92V688 is offline   Reply With Quote
Old 07-03-2006, 09:52 PM   #3
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

The sensor in the airbox is the Intake Air Sensor. Can you get a scan with them all plugged in while you drive? See if the IAT is reading at or above outside air temp, and how many grams per second you get at idle.

I've never had a MAF code before so I don't know if unplugging the IAT is supposed to help.
J Wikoff is offline   Reply With Quote
Old 07-03-2006, 10:16 PM   #4
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jul 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Lord_GalAthon is on a distinguished road
Default

Well, I'm not sure it really helped, and now that I know what it is, I will reconnect it. All I can say for sure is that after I discoed it, the car didn't stall but the stalling is very intermittent, however once it started stalling it did so for like 15-30 minutes. It was to the point where initially I thought she had some bad gasoline or water in her fuel line.

I think it stalled because of the following: (please correct me if I'm wrong)

Once the ECM detects a MAF sensor (or any sensor) failure, it will go onto limp home mode, which runs the engine using predetermined set parameters for the air/fuel and ignition timing.

The spark plugs I removed from the car were absolutely grotesque, I think they might have been the original ones, 5/6 were completely black on the spark side and thread, and very rusty on the outside. The last one I removed, the one right above the sensor on the exhaust line, was cracked and came apart as I was taking it out, I'm glad I managed to get all of it out.

So under normal circumstances, the ECM could compensate for bad spark plugs by varying the ignition timing and air/fuel ratio, however in limp home mode...no.

Also the oil filter was a Mopar (Chrysler), I replaced it with a FRAM, and put Mobil 1 10W30 full synthetic in there. I used Champion Platinum spark plugs from Wal-Mart.

I was thinking of changing the PCV valve but I'm not sure where it is located on that engine, I will once I find it because there was too much oil in the car and that usually kills the PCV valve.

Thanks for letting me know which one it is, I will call auto parts stores tomorrow and shop for one.
Lord_GalAthon is offline   Reply With Quote
Old 07-03-2006, 10:30 PM   #5
Senior Member
Certified Car Nut
 
dbeast420's Avatar
 
Join Date: Aug 2004
Location: My reclining computer chair
Posts: 11,269
Thanks: 0
Thanked 0 Times in 0 Posts
dbeast420 is on a distinguished road
Default

Welcome to the family.

Fram fliters have a bad name around here. Purolator or a good WIX filter would be your best bet
dbeast420 is offline   Reply With Quote
Old 07-03-2006, 10:37 PM   #6
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

Moving to 92-99
J Wikoff is offline   Reply With Quote
Old 07-03-2006, 11:30 PM   #7
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

You need a MAF sensor from a 92-94 Buick LeSabre, Bonneville, or Olds with the 3800. Maf sensors in 95 and newer will not work for you.
willwren is offline   Reply With Quote
Old 07-04-2006, 04:05 PM   #8
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jul 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Lord_GalAthon is on a distinguished road
Default

Found one in a local scrapyard, 100$ with the old one in exchange.
Lord_GalAthon is offline   Reply With Quote
Old 07-04-2006, 07:47 PM   #9
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

A little MAF explanation here...

There are several things used by the cars computer to determine fueling and engine load...

AT idle or Closed throttle plate, the computer goes into coast mode, the PCM sees a low MAF signal as idle... Increased air flow is accelleration... If you were to unplug the MAF sensor( yes its the black box on the throttle body with 3 screws ) and cold start the car it should start right up and idle... With the engine warm if you start it, it will idle up as usuall and most likely stall out... If you were to feather the throttle and bring the idle down slowly the engine should be able to idle... Evidentally the PCM is seeing an issue with the MAF... A replacement should solve the problem... Good luck and let us know how it goes



__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 07-04-2006, 09:19 PM   #10
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jul 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Lord_GalAthon is on a distinguished road
Default

I'm planning on replacing it tomorrow morning, I'll keep you posted on the results. I did start the car with the MAF in my hands, started right up and revved just fine.

Long enough to pull the power windows up as rain was rolling in. I shut it off afterwards.

Incidentally, other than disconnecting the battery for 30 seconds or so to reset the SES, is there anything else I should do after installing the MAF?

I've cleaned as much of the throttle body as possible with an old toothbrush and used compressed air to blow any particles out so they don't wind up in the carburation chamber.
Lord_GalAthon is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Problems with my 1992 SE Bonneville... Rave Detailing & Appearance 3 01-13-2004 01:21 PM
1992 Bonneville SSE without EGR valve newtongtz General GM Chat 2 09-05-2003 08:38 PM
1992 bonneville trouble code 26 quad driver module circuit riotact Performance, Brainstorming & Tuning 6 06-22-2003 08:11 PM
1997 montecarlo vs. 1992 bonneville se I LOST! bonnieman92 General GM Chat 6 06-21-2003 10:37 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:21 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.