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#1
10-15-2013, 10:35 PM
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1994 Olds 88 trans question
This has the 3.8 V6 with auto trans. When just driving around and on the highway it's fine but when climbing a hill at 50-60 MPH. it will buck a little and unless you take it out of OD it will lose speed. I did a transmission service and the fluid was still red, didn't smell at all and except for a greyish coating inside the pan it was spotless. I guess it has a lock-up convertor that isn't unlocking on hills? Should it downshift by itself?
__________________
“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
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#2
10-17-2013, 01:29 AM
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It should downshift by itself but I find it (my car) stays in OD too long on long grades and I usually 'lift foot' shift it to prevent uneccesary lugging. Mine is a 1989, but I did have a '96 Bonneville that had pretty much identical shift characteristics.
Yours won't downshift when releasing the gas pedal for a split second? When on a hill, what rpm does it "buck"? Mine drops down to 1,000 and still won't shift on it's own unless the speed drops below 47 mph. If I lift foot shift it @ 50, it will almost always go right back into OD in 2-3 seconds. It's like an unhappy medium in the 45-50 speed range for these cars on long grades. But back to your symptom. If your lock-up clutch is not releasing it should throw a code in the OBD I. If no codes, I would suspect the vacuum modulator is not working right. |
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#3
10-17-2013, 01:44 AM
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Trans
No codes. I'll try a new modulator it can't be that much. The strange thing is it only does it on hills, like it forgets to unlock or downshift. No tach ether so I don't know what RPM is at the time.
__________________
“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
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#4
10-17-2013, 01:46 AM
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Trouble code for the TCC is 39 on my '89 Buick. I'm thinking it's gonna be the same on a '94.
Any chance your 'bucking' could be a slight misfire under sustained load? |
| The Following User Says Thank You to Lightfoot For This Useful Post: | ||
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#5
10-17-2013, 01:53 AM
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Hmmm...
I was thinking to put a set of wires on it. I did the plugs about a month ago.
__________________
“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
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#6
10-17-2013, 02:15 AM
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A bad plug cable can sometimes show no symptoms unless it's under heavy load.
I don't tend to suspect they are bad unless discovered laying on or very near exhaust manifold, or coated with oil leak grime. Coil packs are just as likely to be defective. Check each pair with an ohm meter for consistent resistance. I can't remember if the OBD I has a code for random misfire. |
| The Following User Says Thank You to Lightfoot For This Useful Post: | ||
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#7
10-17-2013, 07:07 PM
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My 98 Olds 88 did this same thing and it turned out I had bad plug wires. I only found this out last winter when it was 30 below the engine flooded when trying to start one morning. Change the plugs at the same time then.
__________________
Eric 1969 GTO - 461, turbo 400, Continental 13", 3.08 gears. - 12.59 e.t. @ 108.43 mph, 1.898 60' 1978 Oldsmobile Cutlass Supreme- 461, turbo 350, PTC 3500 converter, 9" 3:50 gears. = 11.39 e.t. @ 117.55 mph, 1.599 60' on E85 |
| The Following User Says Thank You to pontiac6269 For This Useful Post: | ||
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#8
10-17-2013, 07:28 PM
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A Modulator only controls shift feel on that trans.
Take your coil packs out and put it in the freezer, then test the resistance. They should all be the same. OBD1 usually does not detect a misfire.
__________________
The difference between inlaws and outlaws? Outlaws are wanted |
| The Following User Says Thank You to stevep For This Useful Post: | ||
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#9
10-21-2013, 10:26 PM
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Changed the wires today and it runs like a champ! The wires were stiff as a board and these two on the coil ends have seen better days. The idle is smoother also. Funny it passed a California smog check with the old crappy wires.
__________________
“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
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#10
10-30-2014, 10:45 PM
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OK, I know this post is old but I figured a follow up can't hurt. I changed the oil last night and when I fired it up to check for leaks I noticed three small vacuum lines were collapsed! I changed all three and now no more bucking, plus the idle is very smooth now. The hoses also had holes in them. I can't believe I didn't notice this before.
__________________
“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
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