Found some codes on 1991 Olds 88 Royale. - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-22-2015, 04:47 AM   #21
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I wish I knew what to suggest, hopefully somebody else has some ideas, and can answer your question about testing the brake switch.

About the gas, were you using premium gas before?
To be honest unless a car specifically calls for that higher octane, it should run better on lower octane gas.
I could see going higher octane if you had knocking, but if you don't I'd just run the 87 in it, you'll save money.
You really only need higher octane if you have a higher compression rate, or if you had a supercharger.
The added detergents of higher octane gas do not always help.
Check your owners manual, I bet it calls for 87.
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Old 12-22-2015, 04:54 AM   #22
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If you cannot find your owners manual, try this, it should show the the octane rating gas you need.
https://www.fueleconomy.gov

Hmmm, I do not see the link to search for your cars needed octane, I'll check it when I wake up, sleepy time for me!
Maybe try the "Find a Car" link.
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Old 12-23-2015, 02:50 AM   #23
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Hello guys!
First of all this morning I had to go do some errands, so I get into the car and I spent at least 10 minutes trying to get it started by having to keep my foot on the gas pedal to keep it from dying as I am backing out of my driveway. So later today I had a chance to have my retired mechanic friend hook up his Snap On scan tool up to my car and we took it for a road test with it plugged in. Here is what we found: all of the sensors, TPS, IAC, ect..... were functioning perfectly and the scan tool matched the speedometer readings along with the gear shifts as we accelerated. However the TCC would kick on and off more often than it should, according to the scan tool. So as we find a place to turn around, I begin to accelerate and the scan tool indicates the 27 28 and 29 codes right away before reaching 50 MPH, yet the gears all seemed to be working like they should as the scan tool displayed. Anyways we get back to my friends shop and he calls his transmission repair guy and tells him about the issue and what the scan tool showed. The transmission guy suggested that I track down the relay for the TCC / Transmission and try swaping them with another one from elsewhere on the car to see if it changes anything. My FSM does not seem to show there being a relay for it which is not uncommon apparently. Finally he said that it definitely sounds like a electrical and wiring issue, but he told me that he has a used neutral safety switch that he wants to try and see if there is actually something wacky going on with the one thats on there now and he wants to investigate the wiring as well. But this will probably be next week sometime. So I guess I am making some progress. But the truth is that I am just not ready to give up on this car, even if it is getting "older" because I know the next car I wind up with will have its own set of problems and what not.
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Old 12-23-2015, 06:47 AM   #24
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Slow progress is better than no progress, I know man, I have been there myself!
Hopefully next week you find out some good news!
And yeah you are right, another car could just be another can of worms, that is why I still have my 96' PA, I know what has been done do it, and how to fix things if something goes wrong.
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Old 12-27-2015, 10:04 PM   #25
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I see that you are located in Montana where there are some fuel stations that sell E0 fuel. I average 25-29 mpg with E0 fuel in my 1989 Electra with 76,000 miles. At the local junk yard I saw a 1990 Olds H body with 419,000 miles on the odometer. These cars are keepers and I'm always looking for one with low miles . Stupid comment, I see that you are in Montana, these cars will cycle TCC if trans temp is too cool. Leaking injectors, loss of fuel pressure will give extended crank time and weak idle on startup.
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Old 12-28-2015, 04:33 PM   #26
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Hope you all had a great Christmas!
Last week after having my mechanic help me investigate these annoying codes with his scanner, I went to the Rock Auto web site to see how much a new neutral safety switch would cost. Believe it or not they had a clearance sale on this switch and it was less than $20 bucks for a brand new one!!! It normally costed about 80 bucks, so I ordered it. Anyways I studied my FSM on how to install this switch correctly and I was able to install it fairly easily today! When I started to take the old one off I noticed that the 2 bolts that attach it to the tranny were loose, I mean I was able to remove them with my fingers no problem. After I get the old switch assembly out I get the new one installed without any headaches. I then tested it out to make sure that it doesnt start in any other gear except for park and neutral and everything checks out great! I took it for a test drive and everything seems to be working correctly. Once I got home, I checked for codes and the usual codes 27, 28, and 29 show up. No surprise. I finally got around to taking the old switch apart and it was fairly dirty and I then saw that 2 of the six copper contacts looked really worn, I have a pic of it here.
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Old 12-28-2015, 07:55 PM   #27
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We had a wet rainy Christmas here, was hoping for snow instead..
Nice job catching a good sale, I always check RockAuto first.
Hopefully those codes stop popping up, did the mechanic have any idea as to what could be causing them?
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Old 12-29-2015, 12:14 AM   #28
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Yeah we have over a foot of snow over here and its been fairly cold each day. My mechanic is stumped by these codes as well as I am. Everything seemed to be working fine when we took a ten minute test drive with his scan tool, last week. The only thing we did notice on the scan tool was that the TCC kept kicking on and off, and when we turned around to go back to his shop, the codes 28 and 29 showed up as I started accelerating on the scan tool. As of right now, my gas mileage has been suffering a bit and my mechanic and I still have no idea why I had a problems starting my car those few times. I did do some research on this forum and other sites and there are people who have some of the same problems as I have and a few of them mention the coil pack being involved with the intermittent hard starting issues and some of the codes as well. But it wouldn't surprise me if my coil pack was ready to kick the bucket in the near future along with the fuel pump. There is something I forgot to mention and it happened last week. As I was driving home from work, I noticed that my trip odometer was spinning backwards and I made it stop by barely pressing the reset button and gently slapping the top of dash until it was spinning in the right direction. Now this has happened probably 8 or 9 times for close to 2 years now. I have taken the instrument cluster out and swapped out the trip odometer twice already and everything looked fine on the printed circuit board along with the 2 wiring harness connectors in the dash. I did upgrade my speedometer and gas gauge with ones from a 98 Regency which has the illuminated display because the front lit display that was originally in the car was too hard to see at night even with new bulbs. I replaced all bulbs with LED ones and they look great and much easier to see. I did all of that earlier this year before these code issues came up. I plan on getting an appointment at that transmission shop to see what they find.
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Old 01-03-2016, 12:13 PM   #29
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Good morning everyone.
Well I have been doing quite a bit of research, on these codes and all of the circuits tied in to them. As I have been reading a lot of people on this forum suggest replacing their Magnavox ICM with a Delco type II. I am seriously considering this because I was able to find a find one in a the JY that is in good condition. The only ICM in fact that I could find. What do you guys think about me doing this?
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Old 01-03-2016, 09:11 PM   #30
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I don't like throwing too many parts at something in hopes of fixing a problem, but if you can get it for cheap enough then it would not hurt to try, if they want too much for it look at prices on new ones from places like RockAuto or Amazon, they are not cheap, but I have a spare I keep around just in case..
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