Turbo2
Poster
Posts: 13
Reg: 07-26-16
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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.
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Shepherd
Frequent Contributor
Posts: 1797
Loc: Lake George, NY
Reg: 11-11-15
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01-14-19 07:41 PM - Post#2757389
In response to Turbo2
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.
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Turbo2
Poster
Posts: 13
Reg: 07-26-16
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01-17-19 07:13 AM - Post#2757588
In response to Shepherd
Can I check the TPS with an Ohm meter?
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junkman104
Frequent Contributor
Posts: 1371
Age: 60
Loc: Murphy N.C.
Reg: 01-25-14
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01-17-19 07:03 PM - Post#2757641
In response to Turbo2
Try this https://easyautodiagnosti cs.com/gm/3.1L-3.4L/how-to-test-the-thrott le-position-sensor-1
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Turbo2
Poster
Posts: 13
Reg: 07-26-16
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01-18-19 07:03 AM - Post#2757657
In response to junkman104
I just noticed that this is only happening when the car is fully warmed up. When it is cold, it works fine.
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Turbo2
Poster
Posts: 13
Reg: 07-26-16
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02-05-19 05:47 PM - Post#2759145
In response to junkman104
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.
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Shepherd
Frequent Contributor
Posts: 1797
Loc: Lake George, NY
Reg: 11-11-15
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02-05-19 07:18 PM - Post#2759152
In response to Turbo2
Scan it for the code.
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Turbo2
Poster
Posts: 13
Reg: 07-26-16
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02-07-19 05:59 AM - Post#2759273
In response to Shepherd
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.
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Shepherd
Frequent Contributor
Posts: 1797
Loc: Lake George, NY
Reg: 11-11-15
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02-08-19 11:16 AM - Post#2759393
In response to Turbo2
Make sure you have 5v reference signal and about .5 volts at hot idle.
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Turbo2
Poster
Posts: 13
Reg: 07-26-16
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02-21-19 08:49 AM - Post#2760413
In response to Shepherd
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?
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Shepherd
Frequent Contributor
Posts: 1797
Loc: Lake George, NY
Reg: 11-11-15
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02-23-19 08:42 AM - Post#2760556
In response to Turbo2
Is the tps adjusted to .5v at base idle?
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Turbo2
Poster
Posts: 13
Reg: 07-26-16
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02-24-19 06:55 AM - Post#2760624
In response to Shepherd
Unlike the GM 3.8l the 3.1l doesn't appear to have any adjustment for it.
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Shepherd
Frequent Contributor
Posts: 1797
Loc: Lake George, NY
Reg: 11-11-15
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02-24-19 06:58 AM - Post#2760625
In response to Turbo2
Still, get a dvom on it and see what you have.
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Turbo2
Poster
Posts: 13
Reg: 07-26-16
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03-16-19 04:10 PM - Post#2762257
In response to Shepherd
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.
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Shepherd
Frequent Contributor
Posts: 1797
Loc: Lake George, NY
Reg: 11-11-15
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03-17-19 03:05 PM - Post#2762311
In response to Turbo2
Great, you stuck with it!
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