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Oldsmobile Forum: 1999 Intrigue P0742 code
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Old 2 Weeks Ago
spsmith spsmith is offline
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1999 Intrigue P0742 code

Once or twice per month my 1999 Intrigue will go into a hard shifting mode which I can stop by slowly shifting through the gears a couple of times and then shutting down and restarting the engine. It's only thrown a P0742 code (torque converter clutch solenoid stuck on) one time. What are the possible causes given that I can easily get it out of the hard shifting condition?
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Old 2 Weeks Ago
Cutlass350 Cutlass350 is offline
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I often say that GM makes 90%-95% great cars. It's that 5%-10% that screws people.
These GM trannys have for a Very Long Time, had a few weak design areas. Instead of adding ~$2-$10 cost per unit, GM decided to keep them like they were. That's very common with most of the way that GM does stuff for it's vehicles.

The point?
Iirc, there's a rubber piston and aluminum bore that has a tendency to wear and cause hard shifts.

The "good news": It can be repaired with a kit that will make it much better, and the tranny doesn't have to be removed from the car!

The "bad news": Good luck finding a tranny place that will do it!


So, if you feel like taking a chance, call up locally private owned tranny rebuilders, and see what they say.
To be fair to them, it could be many things. Without doing pressure tests and a Tech-II scan, they can not tell. Even then, those tests are not always very definitive. So, it could be caused by a number of things.

If they did that repair, and it ended up being something else, the person may go on yelp, facebook, etc and complain and bitch about the company. That could be very bad for business.

So, most tranny rebuilders are not going to take a chance on repairs like this.

What may help, is a full tranny flush. Places will charge ?$200? for it.
I did that about 18 months ago. For me, that has meant that my tranny only "acts up" ~~1-2 days each month. So, for me, it was a good bet.

Good Luck!
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spsmith spsmith is offline
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Thank you for your response. After reading this I talked to a local transmission shop that was in agreement that it could be anything from old and dirty fluid to one of several solenoids to the piston and boot you brought up. The upside is the owner and I used to race oval track years ago and he told his tech, "scan it, service it and fix it for $180 plus parts." (Sometimes it's who you know.)

I'll post the results later this week. Thanks again!
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Old 2 Weeks Ago
Cutlass350 Cutlass350 is offline
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Quote:
Originally Posted by spsmith View Post
Thank you for your response. After reading this I talked to a local transmission shop that was in agreement that it could be anything from old and dirty fluid to one of several solenoids to the piston and boot you brought up. The upside is the owner and I used to race oval track years ago and he told his tech, "scan it, service it and fix it for $180 plus parts." (Sometimes it's who you know.)

I'll post the results later this week. Thanks again!
That's great!

Fwiw, I live in a major city. I went to a locally owned tranny shop and asked if they'd just replace the piston and put in the kit. I made it very clear, that even if that wasn't the problem, then that's my problem.

The owner was very nice. He was pretty straight with me.
He basically told me that they mainly do full rebuilds, and an occasional solenoid/etc that scans as bad (GM has has those issues with other trannys). But, it's not really worth the risk, nor their time, to do "questionable" work that I wanted.

If someone really knows the tranny, and has a Tech-II, then with the data, they may be able to see that the rubber piston in question is likely the source of the problem. I do have a Tech-II clone. But, I don't know enough about the tranny data to say that the rubber piston is question is very likely the problem.

And, dealers around here would charge me ~$500-$800+ for the diagnosis and the work. And, of course, they would require a full flush and filter replacement. that is reasonable. But, with dealer rates, that really drive up the cost.

Heck, I can get my local mechanic put in a rebuilt tranny for ?~$1500? Then, no more worries for 5-10 years.

Fwiw, I have over 10 years and over 100K miles on this tranny. I had a 100% brand new tranny put in over10 years ago, by the dealership.


I know that in smaller towns, or with a mechanic that a person knows, things might be different.


Good Luck!
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Old 2 Weeks Ago
01OldsIntrigueOwner 01OldsIntrigueOwner is offline
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I noticed my car (01 Intrigue) is picky when it comes to shifting when it's between 50F and 100F + humidity on a cold start (sometimes it's a little stiff), and my assumption is the brake shift interlock is acting up (the 93 Chevy Van 20 had that issue twice, which is when GM introduced the brake shift interlock for their vans, sedans, the whole 9 yards). My car has 17 years and 116K+ miles on the tranny and it never slipped or grinded a day in its whole life.

The red plague (00 Intrigue) we had suffered a tranny failure at 60K miles years ago and got submerged in flood waters in Jersey 3 years ago, along with the engine, brake lines, and every other thing that used fluid.

Also, quick question: if the tranny fluid is brown, is that bad news, or can that get changed out? I know black fluid with metal particles means the tranny needs to get replaced, a new pan, filter, gasket, and fluid are a must.
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