when i give the car about 3/4 throttle from a stop and the speedometer gets to about 50/60kmh the car starts to bounce and bog any ideas. Guys im really nervous about this could it be the tranny if it is it could be bye bye trans am

thanks for your help
Paul

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1987 Trans AM
305 LG4 5.0L
WS6
700R4
137,000km or 91,333miles
Black on gold trim
t- tops
K&N
Flowmaster 80 series
Sony X-plod deck
prestige 6 x 9s
2 crunch 10" bandpass subs running off the uq7 amp from the factory subs (which i blew with those amps)

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KILLS:

98 Mustang GT, 99? Dodge Ram 2500, 95 Acura Integra, 00 Cavalier (6 car lenghts!!!), many many ricers

 

Well, I'm no expert, but I would guess that's about the shift point from 2nd->3rd. You may want to give the RPM and the gear it is in to know for sure. The guy who knows all about the 700r4's is GMTech (according to Vader!) He could probably tell you for sure, but I think it sounds like some of the clutches are mal-functioning. Chek back for the experts opinion

 

ok thanks for your input

 

I'm not sure what I'm looking for, but here goes...

If the bounce/ bog is speed related, then check tires and suspension. A flat spot in a tire will cause a vibraion or bounce at speed. A severely unbalanced tire will also cause it, but the wheel usually is trash if it's the problem. A driveshaft could be a problem, but I can't exactly describe driveshaft vibration as a 'bounce'.

If the engine speed is what's causing it, check the trans, since the first part of a 700-R4 to fail (normally)is usually the clutches in the 3-4 pack. A sticking 2/3 upshift valve or internal leak somewhere in the 2-3/3-4 circuits could cause a problem, but I'm not a transmission expert, I just do light-duty trans work. Ask GMTech, he knows his shi*, I know, I'm also a Chevy Tech (read his posts).

There could be 50 other tings to check, heres just a few. A little more info would help. Good luck finding your problem.



[This message has been edited by dhirocz (edited April 14, 2001).]

 

i put new tores on thursday and had the car up on a hoist and didnt see anything suspicious from a visual check

 

when the car bogs it doesnt die i just let back on the gas and its ok it seems to happen when the car shifts i thought it was the torque converter locking but i know nothing could it be the carb?

 

I had an '87 T/A too with the same damn problem. If your car is carbureted I can almost garantee that your carb needs a rebuild.

After a while (especially after 100k miles), so much GUNK collects in there and hurts the performance after the throttle opens a certain amount.

Also could be in need of a new fuel filter and HOPEFULLY not a fuel pump. If your car is TBI or TPI, it could be injector related. Keep us posted and good luck man!

 

its carbed another probable cause. anybody else ever have this problem also the car seems to be slower and i couldnt squeel the tires from a stop earlier today. i tried for 10 minutes and no spinning unless i held the brake. my takeoff hasnt been that good . i switched to 91 octane from 87 earlier today good idea or not?

 

Switching octanes is fine! However, to me it does sound like a fuel related problem!! You might need to rebuild the carb like mentioned earlier! You could also have a clogged fuel filter or the fuel line itself could be clogged somewhere!! Also, it's a possibility that you may have just gotten a bad batch of gas! Try some "heat" in the gas tank and see if that helps! Probably not somethin' that easy though!!

Another thing....is it a feedback computer controlled quadrajet carb!! If so, that could be your problem too! In that case, junk the Q-jet, buy a Holley or Edelbrock, and get a non-computer controlled distributor!!

[This message has been edited by 86TpiTransAm (edited April 15, 2001).]

 

i'd suspece it's tune up related with out driving your car. if you aren't sure if it hasa good tune up then i'd do that first, plus a compression check.

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ICON Motorsports

1st & 3rd
MM Black Diamond 538 F&AM

 

btt

 

Maybe try a little more info, like RPMs, can you get past the bogging? Is it only at certain times Hot/Cold? Under load/not under load? Any suspicious noises? ECM codes? I have no experience w/ carbs, but my EFI was in major disrepair and I never had a condition like you described. (Injectors severly leaking, took 3 runs in the cleaner to get to properly flow!) FPR was blown, fuel filter still needs replacing. Pump is still ok though Knock on wood! I think more info would help!
Corry


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Corry Lazarowitz
clazarow@voicenet.com
clazarowitz@hotmail.com
1987 Pontiac Trans AM (GTA?) 350 TPI
SLP 1 3/4" headers, 3" cat back (stock cat
MSD ignition.
MSD Blaster SS coil.
3.73 Rear end gears
Accell 8.8 Wires
Bosh +4 Spark Plugs (Don't know if they really help but hell!)
Holley AFPR
Race Built Automatic trans ('vette servo, shift kit, tightly packed clutches)--just needs titanium gears now!
Newly gutted cat (the car gutted it's own cat!)
More soon when funds are avail...

 

I blame the carb. Maybe a rebuild will help your general acceleration, but at that shift point, I've always had to back off the throttle to get it to shift. From what I understand, it's a common occurence.