push down pedal - slow acceleration (HELP!)

hockeygott · 06-30-2008, 01:55 AM

no diagnostic codes showing up...
now there are 2 new problems:
first, the automatic transmission ignores position "2". if i select position 2, the transmission stays in D-mode.
the other problem is, that it doesnt decelerate normally if i take my foot off the pedal, the rpm meter goes down a bit, up a bit, down a bit and so on.

SideWinderGX · 06-30-2008, 02:55 AM

check your throttle position sensor (TPS), make sure its within spec.

supradaddy0803 · 06-30-2008, 05:40 PM

Well if you want an honest opinion on this from a guy that worked with a ASE certified master mechanic rebuilding autos you have a problem. lol. It sounds like you are having a slipping issue and the tranny is not engaging in 2nd gear at all. I am not to familiar with the auto in mark 3's because I will only buy a stick because a real sports should only have one type of tranny. Now that is out of the way if you feel real adventurous have someone pull the pan on the tranny and check the seals around the pistons in the valve body. They may be wore out and leaking causing the transmission to have problems building pressure. Seeing as a automatic is more of a pump than anything else without pressure you have nothing.
A slow build of pressure would probably not throw a code so that is why you arent finding any on this issue. I have seen it many times on a lot of different transmissions doing the same thing and pretty much every time it was the the seal around either the 1 2 piston or the 3 OD piston leaking and messing up the whole works.

06-30-2008, 02:55 AM	#2
SideWinderGX 3" Exhaust Join Date: Feb 2007 Location: Syracuse, NY Posts: 203	check your throttle position sensor (TPS), make sure its within spec. __________________ my car: 1987 brownish Toyota Supra Turbo, automatic 7MGTE engine with ~100k miles on it.

06-30-2008, 05:40 PM	#3
supradaddy0803 12psi boost Join Date: May 2006 Location: Athens, TX Posts: 308	Well if you want an honest opinion on this from a guy that worked with a ASE certified master mechanic rebuilding autos you have a problem. lol. It sounds like you are having a slipping issue and the tranny is not engaging in 2nd gear at all. I am not to familiar with the auto in mark 3's because I will only buy a stick because a real sports should only have one type of tranny. Now that is out of the way if you feel real adventurous have someone pull the pan on the tranny and check the seals around the pistons in the valve body. They may be wore out and leaking causing the transmission to have problems building pressure. Seeing as a automatic is more of a pump than anything else without pressure you have nothing. A slow build of pressure would probably not throw a code so that is why you arent finding any on this issue. I have seen it many times on a lot of different transmissions doing the same thing and pretty much every time it was the the seal around either the 1 2 piston or the 3 OD piston leaking and messing up the whole works. __________________ 1987 supra NA 5 speed 1JZGTE swap Tokico Illumina 2 and Eibach springs Tokico pillow blocks Suspension Techniques front and rear sway bar HKS super dragger cat-back exhaust plus test pipe Greddy Profec B spec 2 boost controller HKS type 1 turbo timer Supra sport solid steel drive shaft Walboro 255 fuel pump JZA70 Front end mod 18" Volk Racing AV3 18x8.5 front 18x9.5 rear

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06-30-2008, 01:55 AM	#1
hockeygott Stock Join Date: May 2008 Location: switzerland Posts: 3	no diagnostic codes showing up... now there are 2 new problems: first, the automatic transmission ignores position "2". if i select position 2, the transmission stays in D-mode. the other problem is, that it doesnt decelerate normally if i take my foot off the pedal, the rpm meter goes down a bit, up a bit, down a bit and so on.