92 7mge idle issues

seth959ci · 04-07-2010, 03:45 PM

hi, my supra N/A has issues when idling, sometimes it will idle at 1500rpms and sometimes it will struggle to idle at all.. any ideas? the car runs fine while driving

seth959ci · 04-07-2010, 08:03 PM

any help guys?

Green7mgte · 04-07-2010, 08:12 PM

might be a vacuum leak. do a search for the symptoms your having and see what that turns up.

check for codes first.

seth959ci · 04-07-2010, 09:36 PM

thanks

gonna hopefully run codes on it soon, gotta find time for that though

I just dont want it to be the Idle air control valve... those things get pricey

907mge · 04-08-2010, 01:37 AM

the ISC(idle control) is easy to check

it should make a few clicks right after shuting the engine down at least thats what the toyota manual says

cre · 04-08-2010, 02:49 PM

tStart with checking for error codes (see the FAQS), then check the TPS calibration and then the ISCV. That's the order I'd approach it in.

MA70-3.0GT · 04-08-2010, 04:17 PM

Can't put it much better than that, and if the ISCV does turn out to be the prob. it's not always doom & gloom. A fair proportion of the time they're just glued up with old oil & crud & a good clean with brake cleaner spray can sort 'em...

For my money though if it's intermittent I'd suspect the TPS (bet the EML comes on when it won't idle, if it works! next time it won't idle do the diag. check before touching the throttle again & see if you get a code 51...)

seth959ci · 04-10-2010, 01:57 AM

well ran the codes.. codes 41 and 51... TPS and air conditioner switch lol.. getting the TPS tomorrow

cant find anything in my book about the switch though.. but better to fix mechanical issues first

cre · 04-10-2010, 02:08 AM

http://www.cygnusx1.net/Supra/Librar...ction=FI&P=100

MA70-3.0GT · 04-10-2010, 12:55 PM

DON'T GO & BUY a TPS!!!! All the code 51 means 9 times out of 10 is you need to calibrate it as per cre's link! (click next page for info on the actual calibration process after ensuring your vacuum pipes are as they should be...) I should have been more clear really & said I'd suspect the TPS calibration rather than saying just the TPS, sorry that's what rushing to finish a post before dinner does to you!

04-07-2010, 03:45 PM	#1
seth959ci Intake Join Date: Apr 2010 Location: So. Indiana Posts: 31	92 7mge idle issues hi, my supra N/A has issues when idling, sometimes it will idle at 1500rpms and sometimes it will struggle to idle at all.. any ideas? the car runs fine while driving

04-07-2010, 08:12 PM	#3
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	might be a vacuum leak. do a search for the symptoms your having and see what that turns up. check for codes first. __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

04-08-2010, 02:49 PM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	tStart with checking for error codes (see the FAQS), then check the TPS calibration and then the ISCV. That's the order I'd approach it in. __________________ 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 --->

04-08-2010, 04:17 PM	#7
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Can't put it much better than that, and if the ISCV does turn out to be the prob. it's not always doom & gloom. A fair proportion of the time they're just glued up with old oil & crud & a good clean with brake cleaner spray can sort 'em... For my money though if it's intermittent I'd suspect the TPS (bet the EML comes on when it won't idle, if it works! next time it won't idle do the diag. check before touching the throttle again & see if you get a code 51...) __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!! Last edited by MA70-3.0GT; 04-08-2010 at 04:23 PM. Reason: remembered what code is what!!!

04-10-2010, 02:08 AM	#9
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	http://www.cygnusx1.net/Supra/Librar...ction=FI&P=100 __________________ 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 --->

04-07-2010, 08:03 PM	#2
seth959ci Intake Join Date: Apr 2010 Location: So. Indiana Posts: 31	any help guys?

04-07-2010, 09:36 PM	#4
seth959ci Intake Join Date: Apr 2010 Location: So. Indiana Posts: 31	thanks gonna hopefully run codes on it soon, gotta find time for that though I just dont want it to be the Idle air control valve... those things get pricey

04-08-2010, 01:37 AM	#5
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	the ISC(idle control) is easy to check it should make a few clicks right after shuting the engine down at least thats what the toyota manual says

04-10-2010, 01:57 AM	#8
seth959ci Intake Join Date: Apr 2010 Location: So. Indiana Posts: 31	well ran the codes.. codes 41 and 51... TPS and air conditioner switch lol.. getting the TPS tomorrow cant find anything in my book about the switch though.. but better to fix mechanical issues first

04-10-2010, 12:55 PM	#10
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	DON'T GO & BUY a TPS!!!! All the code 51 means 9 times out of 10 is you need to calibrate it as per cre's link! (click next page for info on the actual calibration process after ensuring your vacuum pipes are as they should be...) I should have been more clear really & said I'd suspect the TPS calibration rather than saying just the TPS, sorry that's what rushing to finish a post before dinner does to you! __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!! Last edited by MA70-3.0GT; 04-10-2010 at 12:59 PM.

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