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Discussion Starter #1
Okay, I had a shop do a tranny flush on my '96 3.8.

Not more than 10 minutes down the road the check engine light strats flashing!! Blinking! And the tranny starts to sound funny and shifts horribly. I get horrible gas milage, and the engine feels like it's gonna die, it sputters and almost dies in park or neutral.

What's going on here!? What kind of fluid is SUPPOSED to go into the 4r70w? What kind SHOULD be put in it. I know he had to have put the wrong kind of fluid in there. It's the only explaination!

HELP PLEASE! I don't wanna blow up my tranny, but it's the only car I have to drive!
 

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Mercon V should be in there
 

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Fry Rice Specialist
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make sure the fluid level is up.
 

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Discussion Starter #4
:zbash:

DOH! DOH! DOH!!!!

The mechanic said he put Dextron III/Mercon fluid in my tranny when he flushed it! ACK! I hope re-flushing the tranny will fix it :(

I can't go without my '96... I never put her down for more than a few days for repairs/maintenance. Can't LIVE without that damn bird! :bawling:
 

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I would have them sign something to say that they put the wrong fluid in so you can have proof in case your tranny calls it quits.

I see you live in Lost Wages (Las Vegas), you may want to consider a tranny cooler because of the heat out there.
 

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doubleclutch said:
I would have them sign something to say that they put the wrong fluid in so you can have proof in case your tranny calls it quits.

---That's a seriouly BIG SECOND on that from me!
Your tranny may never have been serviced before, in which case the fluid being removed and replaced finished it off!
BUT, since the garage used the wrong stuff, you might very well be entitled to some free repairs!
I wish you luck my friend!

paul
:eek:
 

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SUPPOSED to have: Mercon
SHOULD have: Mercon V

Technically your transmission calls for Mercon. Mercon V can and should be used, but Mercon is what it originally came with, Mercon V came about to help solve shudder problems.

Sounds like they put in the right stuff.
 

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Discussion Starter #8
Well the mechanic flushed the tranny again with Mercon V. Shifts fairly normal again. But the check engine light still flashes?
 

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Try pulling the codes and see what you get. Or disconnect the battery for 15 minutes and clear them and see if light comes back on.
 

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paulaptrick said:
in which case the fluid being removed and replaced finished it off
Seriously, in which world do you live? I've never heard of that...
 

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Thundergod2120 said:
Well the mechanic flushed the tranny again with Mercon V. Shifts fairly normal again. But the check engine light still flashes?
Also, the CEL wont flash (it will appear) for tranny problems, the O/D light signals tranny problems...take it to advanced auto and get your codes scanned
 

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The Parts Guy
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EPelezo said:
Seriously, in which world do you live? I've never heard of that...
Actually, that can/does happen. Take a 100,000 mile plus transmission that has never had the fluid/filter changed and flush it with new fluid. Both flushing it and the new fluid can break crud loose in the trans, and that crud doesn't exactly do good things for the transmission.

There's my scientific explanation. All I can say is that I've seen it happen before, and I've certainly heard of it happening to quite a few people.

-Rod
 

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Flushing it maybe, because I would assume you're putting force on seals that are old and fragile...but I would assume that just a straigth change with changing the filter wouldnt do anything? My car had over 200k miles on the transmission when I swapped hte fluid and the only reason it failed was due to me overheating it (due to the transmission harness being bonked and it wouldnt shift right).

- Pelezo
 

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The Parts Guy
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Transmission fluid is a detergent. Fresh fluid can break loose crud that has built up over time and cause it to block the small passages throughout the transmission.

Why are we arguing over this?

-Rod
 

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I'm not arguing, learning more like...but just out of curiousty, doesn't fuel have detergents in it too? Then that's like saying if you add fuel you'll kill the piston rings or something like that isn't it?

BTW, I knew it was a detergnet, they use it on RX7's when they are locked up to break free the engine and clean it...smokes like a mofo though...
 

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The Parts Guy
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Yes, fuel does have detergents in it. If you leave the same fuel in your tank for a few years (can't really leave it in there for 100,000 miles :D ), it will varnish and cause buildups, too. As far as fuel messing up the engine, the fuel isn't sitting in the cylinders forming deposits, it's constantly replaced with fresh fuel.

But comparing fuel in the cylinders to trans fluid in the trans is like apples to oranges.

-Rod
 

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But transmission fluid doesn't stay in the transmission, it stays in the pan when its been sitting up?

I asked my stepdad about that because he's been building transmission for a long time and he's never heard of one failing and he's done flushes on ones that have had well over the recommend point, one guy came in, replaced the engine at 213k in his S10 Auto, he decided it was time to do the flush, truck left just fine?
 

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The Parts Guy
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Pelezo, I give up. I have seen it happen before. Fresh fluid breaks loose the deposits built up in the trans (in the pan, valvebody, or otherwise), and those deposits can clog up passages inside the trans.

Just as you mentioned above, trans fluid can be used in an engine to break up deposits in the crankcase. Fresh trans fluid will do the same thing in a transmission. It's not a big deal if you change your fluid regularly, but if the trans has never been serviced, it could cause some big problems.

-Rod
 

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I hate to chime in like this, but I agree with racecougar. I am the living proof of racecougar theory and that's what happen when I changed my tranny fluid, crippled bird and still hunting for a cheap transmission. I backtracked and found out this numbnut previous original owner never ever changed his tranny fluid and I was stupid enough to do it after I brought it and looked what happened. The tranny started acting up within a week and those "tin cans noise" from the TC started right after. All this idiot did was changed his oil every six months and only one front brake job during his ten years ownership! I replaced almost everything when I brought it and the tranny fluid change with new filter was my last job (see my previous posts) before the tranny went south. :mad: Total spent including the car purchase was over 4500.00 and still no ride and still laid off. I don't intend to take any sides between the both of you but this tranny fluid change thing really mess me up. I just hope it don't happen to anyone else, it's really no fun at all!

Kenny
 

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Well,

Maybe the transmission was on the way out anyways, and you changed the fluid and it failed so you thought it was because you had just done the fluid change?

Also, these transmissions are fine with no fluid changes, I changed mine at 201k miles and it was fine for the rest of the year until the harness messed up (I thought it was the tranny on the way out) so I had to power it to get to third gear because it skipped second...so I too thoguht it was because of the fluid change and so did my dad...we put the new tranny in there and same results, come to find out it was the harness anyways...

AND, I got my tranny for $150 with 40k miles on it, can't be beat, look around!
 
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