Strange syptoms

rob Johnson · 10-13-2005, 08:38 PM

Have 1985 Supra with auto that has been running great. Two days ago the dashboard brake light came on and has yet to go out. Next once the car is warmed up it surges from a high idle to a low, if you put the car in gear it kicks back to a high idle and runs but also about the time the brake light came on the low voltage light at the dashboard gauge now stays on and it using the battery for juice to run. The first thing I replaced was the oxygen sensor no help. The alternator could be frozen up but why would the brake light come on. The motor still sound great when cold, HELP??

suprra_girl · 10-14-2005, 01:01 AM

intake manifold leak?

does the engine bay go pshhhhhhhhhhhhhhhhhhhhhhhhhhhhhh in there? while idling?

brake light: you haven't got a blown bulb? are you talking about the brake warning light that comes on the dash or literally a brake light is coming on?

have you checked the water in the battery?

get an auto sparky to quickly check out ur alternator to make sure it's charging

hangsupra · 10-14-2005, 03:37 AM

when it come my brake light on the dash board. first thing i check is my brake fluid... if its low then yeah it does that on us the mk2 owner... fill it up to the position... n double check the brake light again. if that doesnt help n the light still show then double check on your alternater.... if those doesnt work then check on your head light n ect... where all the light bulbs at.... if still didnt work then go to the shop... for electricity testing... i mean dignos.... hope this work for you. it work for me tho... hehe. have a nice one... n let me know how you get to work alright. thanx.

rob Johnson · 10-16-2005, 12:05 AM

Alternator ok, after disconnecting battery to charge, guage and dash brake light functioned perfect. drove car for 10 miles and light started coming back on along with a red light on the dash voltage guage. I'll try disconecting the battery again to see if will reset itself again. Unfortunatley still searching???

rob Johnson · 10-16-2005, 08:47 PM

Pulled negative off battery after charging all night and vehicle dies immediately,

try contactor at alternator since pulling and checking alternator corrected the problem for a short time.

suprra_girl · 10-17-2005, 12:03 PM

just make sure while you are at it all grounds are tightened well

hangsupra · 10-17-2005, 07:01 PM

i pretty sure its your aternater then... n another thing is maybe your batterry too... cause thats what it use to be happen on my mk2 way back than. hope i right... hehe

Quote:

Originally Posted by rob Johnson

Pulled negative off battery after charging all night and vehicle dies immediately,

try contactor at alternator since pulling and checking alternator corrected the problem for a short time.

10-13-2005, 08:38 PM	#1
rob Johnson Stock Join Date: Oct 2005 Posts: 4	Strange symptoms Have 1985 Supra with auto that has been running great. Two days ago the dashboard brake light came on and has yet to go out. Next once the car is warmed up it surges from a high idle to a low, if you put the car in gear it kicks back to a high idle and runs but also about the time the brake light came on the low voltage light at the dashboard gauge now stays on and it using the battery for juice to run. The first thing I replaced was the oxygen sensor no help. The alternator could be frozen up but why would the brake light come on. The motor still sound great when cold, HELP?? Last edited by rob Johnson; 10-14-2005 at 03:58 PM. Reason: clarification

10-14-2005, 01:01 AM	#2
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	intake manifold leak? does the engine bay go pshhhhhhhhhhhhhhhhhhhhhhhhhhhhhh in there? while idling? brake light: you haven't got a blown bulb? are you talking about the brake warning light that comes on the dash or literally a brake light is coming on? have you checked the water in the battery? get an auto sparky to quickly check out ur alternator to make sure it's charging __________________ 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!

10-16-2005, 12:05 AM	#4
rob Johnson Stock Join Date: Oct 2005 Posts: 4	not alternator Alternator ok, after disconnecting battery to charge, guage and dash brake light functioned perfect. drove car for 10 miles and light started coming back on along with a red light on the dash voltage guage. I'll try disconecting the battery again to see if will reset itself again. Unfortunatley still searching???

10-17-2005, 12:03 PM	#6
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	just make sure while you are at it all grounds are tightened well __________________ 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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10-14-2005, 03:37 AM	#3
hangsupra 12psi boost Join Date: Jan 2005 Location: 209 area in cali. Posts: 397	when it come my brake light on the dash board. first thing i check is my brake fluid... if its low then yeah it does that on us the mk2 owner... fill it up to the position... n double check the brake light again. if that doesnt help n the light still show then double check on your alternater.... if those doesnt work then check on your head light n ect... where all the light bulbs at.... if still didnt work then go to the shop... for electricity testing... i mean dignos.... hope this work for you. it work for me tho... hehe. have a nice one... n let me know how you get to work alright. thanx.

10-16-2005, 08:47 PM	#5
rob Johnson Stock Join Date: Oct 2005 Posts: 4	Pulled negative off battery after charging all night and vehicle dies immediately, try contactor at alternator since pulling and checking alternator corrected the problem for a short time.