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Username Post: 1990 Celebrity Torque Converter
Turbo2
Poster
Posts 13
01-14-19 02:06 PM - Post#2757360    

What would make the torque converter on my 1990 Celebrity Eurosport Wagon with the 3.1 V6 kick in when it's in drive (not OD) and only doing about 35 MPH?
It makes the whole car vibrate.
Shepherd
Frequent Contributor
Posts 1818
01-14-19 07:41 PM - Post#2757389    

There was a tech bulletin back in the day to update the prom to facilitate a later lock up point. Also check your tps function, this can cause this issue also.
Turbo2
Poster
Posts 13
01-17-19 07:13 AM - Post#2757588    

Can I check the TPS with an Ohm meter?
junkman104
Frequent Contributor
Posts 1381
junkman104
01-17-19 07:03 PM - Post#2757641    

Try this https://easyautodiagnosti cs.com/gm/3.1L-3.4L/how-to-test-the-thrott le-position-sensor-1
Turbo2
Poster
Posts 13
01-18-19 07:03 AM - Post#2757657    

I just noticed that this is only happening when the car is fully warmed up. When it is cold, it works fine.
Turbo2
Poster
Posts 13
02-05-19 05:47 PM - Post#2759145    

Well, I was getting some funky readings from the TPS so I changed it. For about half the day it was running the best it has run in a decade, but the SES light would come on every time I use the gas pedal (SES was never on with the old TPS). If I let it idle or just coast down the road it would go out. Just now on my way home it went right back to locking the torque converter up at 35 MPH in drive.
Shepherd
Frequent Contributor
Posts 1818
02-05-19 07:18 PM - Post#2759152    

Scan it for the code.
Turbo2
Poster
Posts 13
02-07-19 05:59 AM - Post#2759273    

It has a code 22 TPS low voltage. I removed and reinstalled to make sure it was in correctly. I tested it with my multimeter and all readings are within spec but every time I press the gas pedal the SES light comes back on.
Shepherd
Frequent Contributor
Posts 1818
02-08-19 11:16 AM - Post#2759393    

Make sure you have 5v reference signal and about .5 volts at hot idle.
Turbo2
Poster
Posts 13
02-21-19 08:49 AM - Post#2760413    

It checked out that it was all in spec so I bought another TPS from a different company and it's working great. A few days later the IAC started to act up with a low idle and even stalling a couple of times. I replaced the IAC and went through the procedure to reset it 3 times, but the sensor still isn't working correctly. When I start it up cold it idles a little high as it should but then instead of backing down the RPM's start increasing. Is this another bad sensor right out of the box, or am I missing something?
Shepherd
Frequent Contributor
Posts 1818
02-23-19 08:42 AM - Post#2760556    

Is the tps adjusted to .5v at base idle?
Turbo2
Poster
Posts 13
02-24-19 06:55 AM - Post#2760624    

Unlike the GM 3.8l the 3.1l doesn't appear to have any adjustment for it.
Shepherd
Frequent Contributor
Posts 1818
02-24-19 06:58 AM - Post#2760625    

Still, get a dvom on it and see what you have.
Turbo2
Poster
Posts 13
03-16-19 04:10 PM - Post#2762257    

All voltages were in spec again so I replaced the IAC again. The new IAC would not reset at all, it would idle super high all the time. I replaced it again and now everything is finally working like it should. It's unbelievable what we've come to, 2 original sensors last 30 years but brand new ones are junk right out of the box.
Shepherd
Frequent Contributor
Posts 1818
03-17-19 03:05 PM - Post#2762311    

Great, you stuck with it!
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