Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra

Reply
 
Thread Tools Display Modes
Old 05-14-2014, 11:01 PM   #1
86targatop
Stock
 
Join Date: May 2014
Location: grand rapids michigan US
Posts: 1
86targatop is on a distinguished road
Default karmen vortex possible issue...HELP!!

Hi I just bought the car about 2 weeks ago and it will turn over but she will not stay running unless I am holding the accelerator. WILL NOT IDLE!! And at full throttle will not very or exceed 2100rpms...any suggestions? Thanx in advance
86targatop is offline   Reply With Quote
Old 05-16-2014, 06:17 AM   #2
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,038
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

Have you checked for diagnostic codes? How to do so is covered in the MKIII FAQ section. As for Karman Vortex, that's the type of airflow meter used in the 7M-GTE (turbo models) whether you've got a GTE or a GE (which is all that was available until '87)... well, I'm not sure why you bring that up unless you've already diagnosed more than you've posted. A bad airflow meter (either type) could cause these symptoms, so could a bad knock sensor or several other things. Check the codes and post back with whatever you find.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.

If you're so inclined I'm always more than happy to accept tips via PayPal.
Tip Jar --->
cre is offline   Reply With Quote
Old 05-26-2014, 11:11 PM   #3
supraheelfan
3" Exhaust
 
supraheelfan's Avatar
 
Join Date: Feb 2011
Location: Wilmington, NC
Posts: 178
supraheelfan is on a distinguished road
Default

sorry to highjack this thread but this could help us both..
I have a code 31,43,& 52. I know the code 43 is no big issue cause I've almost fixed that but the 31 and 52 are a pain. What other makes/models can i get a afm from that will work with my 87 7mgte? B/C it's getting harder and harder to find an OEM AFM or even a decent used one.
The code 52 will not go away, however the car drives normal with the code one, meaning no lose of power etc...
__________________
Anyone who has never made a mistake has never tried anything new.
supraheelfan is offline   Reply With Quote
Old 05-27-2014, 08:12 PM   #4
supraheelfan
3" Exhaust
 
supraheelfan's Avatar
 
Join Date: Feb 2011
Location: Wilmington, NC
Posts: 178
supraheelfan is on a distinguished road
Default

Which is better to do: go ahead and replace the OEM AFM. -OR- going to MAF T? Or is MAF T Pro the only way to go?
__________________
Anyone who has never made a mistake has never tried anything new.
supraheelfan is offline   Reply With Quote
Old 05-28-2014, 02:30 PM   #5
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,038
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

Have you rewired the knock sensor with GOOD shielded wire? There's a writeup on it which is commonly linked to here or you can find it via Google. A code 52 doesn't mean the car will be in permanent limp mode, just that the ECU is detecting a significant failure in the knock detection system. If the code keeps coming back, don't ignore it.

Depending on your goals you may want to just look for a good, used Lexus AFM and use the electronics from that in your KVAFM's housing. The electronics are the same it's the housings that are different. This will have you up and running a lot quicker and for less cash. I like the MAFT Pro, but if you're not out to upgrade to S/D or can't find a Lex AFM either the MAF T or MAFT Gen II will be a simpler install and setup.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.

If you're so inclined I'm always more than happy to accept tips via PayPal.
Tip Jar --->
cre is offline   Reply With Quote
Old 05-30-2014, 09:31 PM   #6
supraheelfan
3" Exhaust
 
supraheelfan's Avatar
 
Join Date: Feb 2011
Location: Wilmington, NC
Posts: 178
supraheelfan is on a distinguished road
Default

Thanks CRE
BTW, I did rewire the knock sensor by an import specialist 3 times and he swears the wiring is not the problem. The code 52 doesn't do what it normally would do, for instance the car has power through the entire powerband unless the code 31 comes up then it stalls go and stall again. I had the code 52 on the 7mgte for about 6 months and this doens't seem like a reg. code 52 causing all these problems. I've never had a code 31 and every since the code 31 it's been acting strange and I've yet to see this problem with a code 52. Plus the mech that fixed the knock sensor wiring did it very well with heat shield and extra care b/c I took it too him 3 times to fix the same problem (the code 52.)
__________________
Anyone who has never made a mistake has never tried anything new.

Last edited by supraheelfan; 05-31-2014 at 04:38 AM.
supraheelfan is offline   Reply With Quote
Old 05-31-2014, 04:41 AM   #7
supraheelfan
3" Exhaust
 
supraheelfan's Avatar
 
Join Date: Feb 2011
Location: Wilmington, NC
Posts: 178
supraheelfan is on a distinguished road
Default

If I get the Lexus AFM do I need to upgrade xthe injectors to 550cc also? N/M i guess only need the 550cc injectors if you install the entire afm housing and not just replace the electronics on it.
Plus I want a more reliable sensor and more than anything else I want something that could help me tune the car eventually.

So to clarify a Lexus v8 AFM/Mass air flow sensor will work with replacement of sensor itself correct? For very helpful info: what other Toyota/Lexsus intake sensors will also work as air flow sensor without having to spend way too much on a used new afm
Plus CRE, the best bet would be to just purchase another 7mgte yellow plug ECU and hope that gets rid of the code 52.
__________________
Anyone who has never made a mistake has never tried anything new.

Last edited by supraheelfan; 06-07-2014 at 07:26 PM.
supraheelfan is offline   Reply With Quote
Old 06-11-2014, 08:43 AM   #8
supraheelfan
3" Exhaust
 
supraheelfan's Avatar
 
Join Date: Feb 2011
Location: Wilmington, NC
Posts: 178
supraheelfan is on a distinguished road
Default

Bump!
Do you think switching out the ECU will solve the infamous code 52?
Code 52 has been showing up for at least a year but the car drove great?

Any suggestions to get the code 52 fixed: new( or used knock sensor from supracarparts.com) but they swear the sensor is good. 3 knock sensor rewires by an import specialists shop and still no progress. . All power is there no hesitation so (unless it's so obsolete that I can't even tell a difference when accelerating).
__________________
Anyone who has never made a mistake has never tried anything new.
supraheelfan 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
starting issue? brian white MKIII Supra 7 08-11-2011 03:46 AM
control chip issue? redsupra MKIV Supra 2 05-23-2011 04:11 AM
vacuum lock issue? supraluver4life MKIII Supra 8 08-07-2010 10:54 PM
Wrist pin issue -- Was: Ris pen issue KeelanWiese MKIII Supra 3 02-13-2010 07:38 PM
Engine Run-on Issue gottadiesel MKIII Supra 1 04-02-2009 07:26 AM


All times are GMT. The time now is 02:00 PM.


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