CPU reader on 1992 RMS..

[buick_beauty]

Hello buick enthusiasts, back with another question..
went too our buddy who is a mechanic today, was going too get him to plug in the CPU reader, but it is a different unit then the newer ones..
he said something about putting a pin into two spots in the insert, but he was unsure of which ones they were,

I was wondering if someone could tell me which two slots they are and possibly give me a link too check engine light codes.
ALSO, it is NOT the Limited Sedan with the Climate control..It is just the base model.

Hope that made sense, any help would be gretly appreciated,
thanks in advance for replies.

 

[buickwagon]

Your car is OBD-I. Looking at the connector under the dash, the two terminals you want are the top row right and top row second from right. If the terminals are not there, you are out of luck.

Short them out and then turn the ignition on (do NOT start). The check engine light will flash. If no codes are stored, it will flash a code "12" -- flash, pause, flash flash. Then a longer pause, then it will repeat twice more.

If there are codes, it will flash them out instead, repeating each one a total of 3 times before flashing the next code. After all codes are reported, it will terminate the sequence with a code 12 series.

Easier to use a scan tool. Are you anywhere near Muskoka?

 

[buick_beauty]

Im in the falls. Thanks for the reply though. Hopefully Im one of the "in luck" people.. LOL

 

[buickwagon]

Too bad. I was in Beamsville last Saturday. Oh well...

You might want to check this out: http://www.aldlcable.com/

 

[buick_beauty]

So i have encountered a code 44.. Looked it up, and apparently its my o2 censor. Just wondering, can you confirm this for me, and is there any other problem that could read this?

 

[buick_beauty]

You might want to check this out: http://www.aldlcable.com/

My boyfriends eyes lit right up when he saw that..

 

[Al H.]

So i have encountered a code 44.. Looked it up, and apparently its my o2 censor. Just wondering, can you confirm this for me, and is there any other problem that could read this?

Check it out.

View attachment 3050

It can be the O2 sensor and a few other things.

 

[buickwagon]

This is where a scan tool shines over a simple code reader. A scan tool allows you to view the raw sensor data and helps with diagnosing codes with multiple possible causes. For best results, use in conjunction with a Factory Service Manual.

 

[buick_beauty]

Well, we changed the o2 sensor, which looked blown apart.. But still have a code 44. There is virtually nothing wrong, other than the cat.. Would that have and effect of code 44, and also, this would cause a bad idle, acceleration, and maintainingspeed.. correct?

 

[buickwagon]

Did you clear the codes after the repair? You will find a fuse under the hood on the passenger side near the firewall. Remove it for 30 seconds or a minute to erase the ECM memory and clear the code. If the same code comes back, you still have a problem.

"other than the cat" -- do you mean to say you have a catalytic converter problem? That could explain several if not all of the conditions you describe. A plugged cat converter will restrict the exhaust and the increased back-pressure will cause all kinds of problems.

 

[buick_beauty]

Im going too try to reset the codes and see if that does it when im not so sore and its not so crappy out..thanks for the info!
And yes the catalytic converter.. I believe it is stock and clogged like no tommorrow..deffinately needs an upgrade..

 

[buickwagon]

Have you checked the cat converter? Check the manifold vacuum with a vacuum gauge. They are a cheap but very useful diagnostic tool, available at any auto parts shop, even Canadian Tire. Intake vacuum should usually be 18 to 22 inches of mercury (Hg) and fairly steady at idle. A badly restricted cat will cause the reading to slowly drop after start-up. Shutting the car off for a minute will bring the vacuum back up on restart, but it will start slowly dropping again.

It may be necessary to increase engine speed to 2,500 rpm and hold steady to detect a moderately plugged cat. The vacuum will immediately drop when you first open the throttle, then stabilize -- that's normal. But if the vacuum reading remains low or continues to drop, backpressure is building suggesting a restricted cat converter.

 

[MrMarty51]

I`ve seen severly plugged cats`ll make a hissing noise after shutting the engine down,first time I heard that I`m like thinking what the heck,pulled the cat and then the pickup run real good.