push down pedal - slow acceleration (HELP!)

hockeygott · 05-21-2008, 12:57 AM

hi

every 50-100 miles, my supra has a problem, which none of about 10 mechanics could repair yet, nor tell why it occurs. i hope someone here can help me.

the problem:
if i push the pedal down in "D"-position after the car has fully stopped, it accelerates very, very slowly. as if it were a vw golf or it's running only on half of the cylinders. the rpm meter climbs at around 500rpm in 2 seconds. this problem will last 1-5 seconds. no matter if i kick down or gently push down the pedal. after this, power sets in immediately.

i drive an automatic '89 supra mk3 with turbo (7m-gte).
transmission oil has recently been changed, motor oil too.
except this problem, there are no more symptoms. it runs absolutely well.
mileage: 130'000 km, thats about 90'000 miles, i think.

mrnickleye · 05-21-2008, 06:14 AM

sounds strange. you'll need to start checking all yur sensors to make sure they are within specs. Sounds like the computer is not allowing enough fuel needed during that senerio.

supramacist · 05-21-2008, 06:56 AM

That means you're going to have to start metering all that you can and probably even the ecu.

I would think that if you started with the ecu and worked your way out you would find it more quickley.

As opposed to starting from a choice of places under the hood.

Am I wrong? If so please correct me.

hockeygott · 05-21-2008, 09:40 AM

thank you, i'll try this.

someone told me, the supra has a "steering box", containing a chip which calculates best shifting points for the automatic transmission. how do you really call this box? it isn't the ecu, am i right? they told me, the replacement of this box would cost me about 500 swiss francs, that's 500$.

suprra_girl · 05-21-2008, 12:03 PM

Try starting off with doing a diagnostic on your engine and transmission.
Link for engine diagnostics is in my signature. Transmission is similar but you put a paperclip between TT (89+) or ECT (pre89) and E1 and your o/d light will flash the codes.

Good luck

And don't buy the "steering box"

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.

05-21-2008, 12:57 AM	#1
hockeygott Stock Join Date: May 2008 Location: switzerland Posts: 3	push down pedal - slow acceleration (HELP!) hi every 50-100 miles, my supra has a problem, which none of about 10 mechanics could repair yet, nor tell why it occurs. i hope someone here can help me. the problem: if i push the pedal down in "D"-position after the car has fully stopped, it accelerates very, very slowly. as if it were a vw golf or it's running only on half of the cylinders. the rpm meter climbs at around 500rpm in 2 seconds. this problem will last 1-5 seconds. no matter if i kick down or gently push down the pedal. after this, power sets in immediately. i drive an automatic '89 supra mk3 with turbo (7m-gte). transmission oil has recently been changed, motor oil too. except this problem, there are no more symptoms. it runs absolutely well. mileage: 130'000 km, thats about 90'000 miles, i think.

05-21-2008, 06:14 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	sounds strange. you'll need to start checking all yur sensors to make sure they are within specs. Sounds like the computer is not allowing enough fuel needed during that senerio. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

05-21-2008, 12:03 PM	#5
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	Try starting off with doing a diagnostic on your engine and transmission. Link for engine diagnostics is in my signature. Transmission is similar but you put a paperclip between TT (89+) or ECT (pre89) and E1 and your o/d light will flash the codes. Good luck And don't buy the "steering box" __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

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05-21-2008, 06:56 AM	#3
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	That means you're going to have to start metering all that you can and probably even the ecu. I would think that if you started with the ecu and worked your way out you would find it more quickley. As opposed to starting from a choice of places under the hood. Am I wrong? If so please correct me.

05-21-2008, 09:40 AM	#4
hockeygott Stock Join Date: May 2008 Location: switzerland Posts: 3	thank you, i'll try this. someone told me, the supra has a "steering box", containing a chip which calculates best shifting points for the automatic transmission. how do you really call this box? it isn't the ecu, am i right? they told me, the replacement of this box would cost me about 500 swiss francs, that's 500$.

06-30-2008, 01:55 AM	#6
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.