'99 Olds 88 issues - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Oldsmobile For model specific mechanical problems for all vehicles under the Oldsmobile badge.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-02-2016, 07:12 PM   #1
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
MushCreek is on a distinguished road
Question '99 Olds 88 issues

I recently became the proud owner of my wife'* '99 Olds 88. After too many issues, she bought a new car, so I get the old one...

Here'* what'* going on: When cold, the car runs fine. After about 10-15 minutes, the trouble begins. First, the idle starts to surge up and down. Sometimes it stalls. After a bit longer, it starts to 'hiccup' under acceleration. The last symptom is that the speedometer drops to '0'. It keeps doing this stuff unless you let it cool down.

We brought it to a shop, who latched onto the MAF code. They cleaned and tested it, and declared the car 'fixed'. I asked what this had to do with the speedometer problem, and just got a dirty look. It hasn't thrown a code since then, but the same problems exist.

It seems to be either heat or time related, most likely heat. Something is acting up on the warm car. My guesses would either be an electrical connection, or a solid-state device that is breaking down once up to operating temperature. The tricky part is- finding it.

I have time this weekend to start exploring. I'll look for obvious poor connections, and make sure that all grounds are clean and tight (battery has already been checked). Any thoughts on where to look? I'm an old-school shade tree mechanic, with little experience on this new-fangled stuff. I won't put a lot of money in to this car, but it is in nice shape with only 120K miles. It'd be a shame to dump it for a glitch. Again, any thoughts would be greatly appreciated!

We'll get into all the other minor issues once we get the old girl running right!
MushCreek is offline   Reply With Quote
Old 09-04-2016, 12:39 PM   #2
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 1,814
Thanked 702 Times in 542 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

do you have access to a scan tool to read data?
Tech II is offline   Reply With Quote
Old 09-04-2016, 03:11 PM   #3
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
MushCreek is on a distinguished road
Default

All I have is an OBD II reader. Saturday, I went over the entire engine compartment, looking for bad connections or loose grounds- nothing found. It'* definitely time or heat related- I let it idle in the driveway, and in about 15 minutes, it began to act up. I'm wondering if it'* a solid state component in its death throes. I once had a stereo that played fine until it warmed up. Then , it began making a thumping noise. Turned out to be a power transistor in the amp. I'm half tempted to just throw a new ECM in it.

I did a bunch of research online. Although the MAF checks OK when cool, I wonder if it has a poor ground. According to the many schematics I found, the MAF ground goes to S103 (splice?), along with a bunch of other grounds, including the VSS, among other things. From the splice, it goes to G103, which I assume is a grounding point. The problem is that I can't any information on where G103 is physically located. A poor ground there might explain the poor performance AND speedo failure.

Tuesday, I'm going to call another repair place to see if they want to tackle it. It'* hard to find a small place that knows how to fix this stuff, and I can't afford a GM dealer- the car'* not worth putting thousands into.
MushCreek is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
'93 Olds Eighty-Eight 4T60E Issues Martinnhs12 Oldsmobile 7 06-15-2015 07:52 PM
94 Olds Cutlass Supreme Signal Issues Gankinu Oldsmobile 5 05-21-2015 09:28 PM
No start issues... 89 Olds 88 Royale 88on24s 1987-1991 4 03-29-2011 11:50 AM
Olds 88 Royal LS Issues WeaD Oldsmobile 10 05-24-2010 11:19 AM
1999 Olds eighty-eight aftermarket radio issues.. TROYPORT Audio (and aftermarket electronics) 3 02-05-2008 07:02 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 05:46 AM.