oldsmobile forums   oldsmobile forums

Go Back   Oldsmobile Forums > Older Requested Oldsmobile Models > Oldsmobile Ninety-Eight (98)


Oldsmobile Ninety-Eight (98) Forum specifically intended for Oldsmobile Ninety-Eight (98) based discussions.

Oldsmobile Forum: sick 96 Regency
Thread Tools
Old March 3rd, 2017
rdrodgers rdrodgers is offline
Junior Member
Join Date: Mar 2017
Location: Ranger, TX
Posts: 2
rdrodgers is on a distinguished road
sick 96 Regency

I have a 1996 Oldsmobile 98 Regency with the 3.8 (3800) V-6.

A few weeks ago it started losing coolant and the idle speed was high. I pulled the upper and lower intakes and replaced both sets of gaskets. Both had failed allowing coolant to leak and causing a vacuum leak.

Got that ll put together and now the car stalls once it warms up. Stalls in park or driving down the road. If you get slow enough for it to idle, it stalls.

Put it on my Snap-On MT2500 scanner and no codes stored. Looking at data stream I get no reading from the map sensor. The reading actually shows -0.55 volts for the voltage on the map sensor. From what I'm finding in the help section of the scanner is I should be showing right at 5 volts on the map sensor with the key on, but engine off. Then when the engine starts I should have about 1 volt. I can backprobe the connector on the ECM (pin 12) for the map sensor input and I have those readings on my volt meter, but no reading on the scanner. I'm thinking ECM is bad so I replace it, and still have the same readings.

Also, on the MAF sensor, I am reading Hz, but not reading g. I have one reading on the MAF, but not the other, and this issue is the same with the old ECM or the rebuilt ECM

It has new MAF, new MAP, new TPS and new IAC.

The IAC counts drop to 25 at idle once it warms up to go into closed loop.

I have 55 pounds of fuel pressure and 16 inches of vacuum at idle (cold start).

Do i have another bad ECM? The wiring all ohms out to be good between the sensors and their pin on the ECM. I've cleaned grounds on the engine and body thinking I might have a bad ground.

I'm lost as what to do next.

From a cold start it runs well, until it gets warm enough to go into closed loop, then the stalling starts.
Reply With Quote

Old March 12th, 2017
rdrodgers rdrodgers is offline
Junior Member
Join Date: Mar 2017
Location: Ranger, TX
Posts: 2
rdrodgers is on a distinguished road
Seems everyone reading this is as stumped as I am. Took it to a repair shop last week, they seem to be stumped as well.
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

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

Forum Jump

All times are GMT -4. The time now is 06:45 PM.

cars connected social network

suspension parts, shocks, struts and more

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
oldsmobileforums.com recognizes that "Oldsmobile", it's logos and various model names and numbers are registered trademarks of the General Motors Corporation. These terms are used for identification purposes only. oldsmobileforums.com is not affiliated in any way with the General Motors Corporation, Oldsmobile or any other company listed herein. All information on this site is the opinion of its members and not the opinion of the site itself. ©2017 oldsmobileforums.com. All rights reserved.
Need products for your Oldsmobile? Check out your options at the links below:

Miss that Olds 442? Believe it or not, Kia may have something for you. The Kia Stinger is a large sport-oriented hatchback sedan in the mold of the Audi A7.