1989 3800 stalling and hunting at idle - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 01-24-2007, 11:55 AM   #11
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Quote:
Originally Posted by toddcrowther
Thanks very much.

That is a lot of great info.

Todd
Not a problem... Let us know what you find.. we all learn from experience

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 01-24-2007, 08:09 PM   #12
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jan 2007
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
toddcrowther is on a distinguished road
Default

I didn't know about the no code 33 thing. That is really valuable info for me because it set me on the right path. The car runs well until it is warmed up. I believe you are correct and the MAF is garbage. The screwdriver tap seems to confirm this. Why does the car run well until it is warmed up? Is there a default setting, and if so is there a way to make it run on that full time until I get a (better) replacement MAF?
And thanks again for the detailed info, it was really useful. I am not sucking up, I just am happy to find a guy who knows all these details. OK maybe I am sucking up a bit.

Todd
toddcrowther is offline   Reply With Quote
Old 01-24-2007, 09:04 PM   #13
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Quote:
Originally Posted by toddcrowther
I didn't know about the no code 33 thing. That is really valuable info for me because it set me on the right path. The car runs well until it is warmed up. I believe you are correct and the MAF is garbage. The screwdriver tap seems to confirm this. Why does the car run well until it is warmed up? Is there a default setting, and if so is there a way to make it run on that full time until I get a (better) replacement MAF?
And thanks again for the detailed info, it was really useful. I am not sucking up, I just am happy to find a guy who knows all these details. OK maybe I am sucking up a bit.

Todd
The screwdriver tap is a good trick... And any changes will confirm that the MAF is junk.. Have any junk yards near you? Might pick up a good one for Cheap...

And there is no default setting for these cars, They will run on a totally dead MAF, But want to stall all of the time, and you will have next to nothing for power.. The 3800'*( all of them from all years ) are very dependant on the MAF... No way around it..

Glad we can help where we can.. I'd say junk yard it and see if you find a totalled low Milage 89-91 3800 and grab the sensor from it

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 01-25-2007, 12:01 AM   #14
Senior Member
Certified GM nut
 
Join Date: Jan 2004
Posts: 1,656
Thanks: 0
Thanked 0 Times in 0 Posts
crzydmnd72 is on a distinguished road
Default

Worth noting, you can limp along for awhile by unplugging the MAF, car will still run really crappy but at least sorta consistent till you get a new one. Don't expect any sort of gas mileage either.

For some reason, I am thinking that Autozone sells Remanufactured MAF sensors. At first I wondered HOW they rebuild it, maybe they just solder in new filaments?

Nonetheless, they are pricey and if $$$ is a concern, then Ebay or junkyard might provide some happy results.

And everything JRS3800 said, His advice hasnt steered me wrong yet
crzydmnd72 is offline   Reply With Quote
Old 01-25-2007, 12:06 AM   #15
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jan 2007
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
toddcrowther is on a distinguished road
Default

Thanks, I may try unplugging it. I am going to try people who are parting out cars, and if no luck there, then the junkyards. Buicks, Pontiacs and Olds had the 3.8 engines right?

This is the best site I have found on the internet, (well except for the one that has Elle McPherson in a bikini.)

Todd
toddcrowther is offline   Reply With Quote
Old 01-25-2007, 12:15 AM   #16
Senior Member
Certified GM nut
 
Join Date: Jan 2004
Posts: 1,656
Thanks: 0
Thanked 0 Times in 0 Posts
crzydmnd72 is on a distinguished road
Default

I think one of my replacements from Ebay actually came from a 3.3 liter. identical style and plug layout though. Works and doesnt set a Check engine light. It helps when they have a pic of the item.
crzydmnd72 is offline   Reply With Quote
Old 01-25-2007, 12:20 AM   #17
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jan 2007
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
toddcrowther is on a distinguished road
Default

Thanks, more good info.

There is one on ebay right now for $9.99.

Todd
toddcrowther is offline   Reply With Quote
Old 01-25-2007, 12:33 PM   #18
Junior Member
Posts like a V-Tak
 
Join Date: Jan 2006
Location: Alberta, Canada
Posts: 26
Thanks: 0
Thanked 0 Times in 0 Posts
mAsalicio is on a distinguished road
Default MAF

I have had code 34 before, it was my MAF. The car ran totally crazy like it was possessed. Bucking and loping, hesitating and stalling. Unplugged the MAF, ran a little better. But still totally a**tacular.

When it died on me I had nil for cash and did a wrecking yard run. Bought the first 3 in site for $10/ea. IT WAS COLD!

First one - Off a buick regal, worked fine. Engine came to perfect idle.
Second one - Off a olds delta 88, no go.
Third one - Off a 3300 buick century, worked fine. Engine came to perfect idle.

True there is no code 33... atleast for my 91 vin C. Should hold true for your 89-90.

Code 34 - There was no MAF signal for over 4 seconds while engine was running.

I would not think TPS. I ran with no TPS for about three days once till I could get a new one. Trans would not lockup with no TPS signal, and I seemed like someone replaced my 3800 w/ a Honda 1.6L. Idle DID search once in a while, but not constantly. Ususally for a cpl seconds when I just stopped at a light then go back to normal. Also there was no stalling whatsoever. It ran like it needed a major tune up.

Could make a theory about the IAC motor being sticky or has dead spots. That happened once to my brothers car, a 88 Pontiac 6000 SLE w/ 2.8L V6 (that engine was a hunk of junk). Did not throw any codes though, but the car hunted for idle constantly. I can not remember what codes IAC are sorry. However, on my car if I unplug it while idling, the idle takes off to like 3grand. Then i plug it back it and settles back to 750ish.

I would still try the MAF first. All I can think of right now.
mAsalicio is offline   Reply With Quote
Old 01-25-2007, 12:43 PM   #19
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

The TPS can cause a lot of driveability issues with idle and fueling as well as the TCC and cruise control circuits...

When you dissconnect the TPS you enter a default of sorts and the engine idles up a bit as the ECM has no clue where the throttle is, nor will it have any idea what load is being placed on the engine.. A bad TPS can cause intermintent ups and downs un idle right down to a high idle or a stall out... If the sensor work on the lower end of the scale but failed on the upper end, the TCC my not unlock when you Floor it...

And iy you have a newer Bonneville 92+ with a 4T60-E or 4T65-E you will have Tranny control issues as well, all the way to a loss of kickdown signal...

There are a lot of driveability issues that can be cause buy a TPS.. And this will usually result in the code 21 or 22..

When you have a code 34, you can most deffinitely bet the MAF is dead... There is a slim chance that you could have a bad wire... But 9 out of 10 a code 34 ='* a bad MAF

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 01-25-2007, 12:51 PM   #20
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jan 2007
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
toddcrowther is on a distinguished road
Default

Thanks guys,

I blew a whack on a new MAF just over a year ago. Turns out it was NOT OEM like I thought. I won't do that again. I have a line on a couple of cars that may be parted out. I'd rather pay 20 bucks for a used one and carry some spares. I called the junkyard and they want $100. I am in Canada, so that explains it. eh!
toddcrowther is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1989 Bonneville SSE sudden clankin noise on start and idle binkster 1987-1991 7 06-08-2009 12:15 AM
Aftermarket Ignition Control Module; 1989 Olds Delta 88; 3800 Vin C 96Bonne124 1987-1991 1 05-10-2009 01:10 AM
1989 stalling/guages not working fierojamey 1987-1991 3 03-31-2007 02:01 AM
Oil in intake, stalling when starting, and poor idle mrbell83 Pontiac 7 11-09-2006 08:30 PM
1989 backfiring and stalling when engine is hot?? jaswasup 1987-1991 8 11-13-2004 12:53 PM


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 06:47 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.