Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > General Discussions > Non-Generation Specific Questions

Reply
 
Thread Tools Display Modes
Old 06-08-2006, 11:31 PM   #1
spycialost9999
Stock
 
spycialost9999's Avatar
 
Join Date: Jun 2006
Location: EDINBURG TX 78541
Posts: 6
spycialost9999 is on a distinguished road
Thumbs down 1987 Toyota Supra Idle

My Supra 5spd 3.0 non-turbo idles from 1000rpm to 2000rpm, back and forth. Doesn't matter if in neutral(no gear) or what temperature the engine is. Could this be the air flow meter, idle air control valve, or throttle sensor? Cleaned around all the spark plugs and replaced with bosch platinum quad tip. The idle air control valve had alot of carbon so I cleaned that also. Checked for vaccuum leaks, could not find any. Vehicle runs ok on highway, but when in idle it just goes up and down from 1500 to 2000rpm. This might be important, I broke the BVCV that is attached to thermostat housing, would that cause me my problems. Also, I just replaced the power steering pump amd am wondering how important is vaccuum hose connection? Last thing-the fuel gauge sometimes reads empty even though its full. All the other gauges working.

Last edited by spycialost9999; 06-10-2006 at 04:38 AM.
spycialost9999 is offline   Reply With Quote
Old 06-09-2006, 04:03 AM   #2
damdog05
12psi boost
 
damdog05's Avatar
 
Join Date: Apr 2006
Location: Georgia
Posts: 250
damdog05 is on a distinguished road
Default

i believe that if it were you air flow meter, which i assume is a mass air flow sensor as i know it, your car wouldnt run at all. someone please correct me if im wrong though as im still in the process of learning things.

as for the other two, throttle position sensor would be my guess. you should probably wait for someone more knowledgable to reply too but im using your post to see how correct i am.

thanks for listening to my 2 cents.
__________________
My cars:
85 Trans Am- Ehhh- Gone
83 Rx7- Much Better- Gone
86.5 Supra- Love- Not Gone
damdog05 is offline   Reply With Quote
Old 06-09-2006, 11:29 PM   #3
mrnickleye
1000whp postwhore
 
mrnickleye's Avatar
 
Join Date: Jun 2005
Location: Mojave Desert, Calif.
Posts: 1,705
mrnickleye is on a distinguished road
Default

The 7MGE uses an Air Flow Meter, which has a little spring loaded door inside that opens more as the amount of intake air increases.

First thing, get 2 bottles of Techron injector cleaner (or Lucas)and put it into a full tank of gas and drive it till that tank is gone. A partially clogged injector(s) can lean the mixture, which may be more noticably at idle. If the computer senses a lean condition, it will richen up the mixture, then maybe to rich in other cylinders, then back and forth, which can give the problem you have.

Generally (of course anything is possible) the TPS won't cause your problem. At idle, the switch is supposed to be closed. So it is possible that the TPS is the problem. If the switch is 'open' the computer will not function properly, thus ...

The TPS could be out of adjustment, too.

Try these first. TSRM will tell you how to check the TPS and adjust it.
__________________
Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing.
TEMS, and some nice MODS. Sold to a friend 10/08/08.
mrnickleye is offline   Reply With Quote
Old 06-14-2006, 06:33 PM   #4
tonystarks
Intake
 
Join Date: Apr 2006
Location: Joliet,IL
Posts: 33
tonystarks is on a distinguished road
Cool me too

yeah my 86 idles crazy and I also broke my sensor on the therm housing. I have changed the valve cover gasket,replaced the isc, fuel pump, filter, ecu, vaccuum checked this bitch,spark plugs, wires, cap and rotor, brake master cylinder and changed the oil/filter and ran lucas injector cleaner and still idles wildly. Its really pissing me off. so if anyone can help some brothers out that would be awesome
__________________
86.5 MK Trey

7MGE
K&N Filter Kit
cheap ass exhaust
turbo swap in a few months
tonystarks is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
1987 Toyota Supra MKIII 350 Chevy / 700R4 Project Car Vacationtime247 Show n Tell 4 06-04-2009 03:53 AM
HELP PLEASE Nick0887 Non-Generation Specific Questions 4 02-28-2009 07:26 AM
Looking for the best intake for a 1987 toyota supra non turbo toofast4urass MKIII Supra 6 02-23-2007 05:30 AM
1987 Toyota Supra Lift Kits spycialost9999 Non-Generation Specific Questions 12 06-14-2006 03:26 PM


All times are GMT. The time now is 11:37 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87