idle's fluctuating?

jason7504 · 04-10-2010, 01:12 AM

hi guys,

I just got a 87 NA supra and it runs pretty good but i noticed at idle it kind of fluctuates, what do you think is causing this? how should i diagnose this?

cre · 04-10-2010, 01:32 AM

Start with what's suggested here: http://www.toyota-supra.info/forums/...le-issues.html

Possibilities include: TPS, AFM, Vacuum Leak, Intake Leak, misfiring, improper ignition timing

jason7504 · 04-10-2010, 01:52 AM

here's a video

jason7504 · 04-10-2010, 04:18 PM

does that video point to anything specific?

jason7504 · 04-16-2010, 12:15 AM

would low oil pressure from some leaks cause the idle to fluctuate?

cre · 04-16-2010, 04:50 AM

What have you actually checked?

jason7504 · 04-16-2010, 06:47 AM

Quote:

Originally Posted by cre

What have you actually checked?

well i know there's a few places that leak oil such as the valve cover gasket but not sure how to check to see where the vaccum leaks might be, heard something about using brake fluid or something but not sure what the best way to do it is

jason7504 · 04-28-2010, 10:55 PM

i think the spark plugs are misfiring because oil is leaking from the valve cover into the spark plug tubes

04-10-2010, 01:12 AM	#1
jason7504 Intake Join Date: Apr 2010 Location: Vancouver, WA Posts: 48	idle's fluctuating? hi guys, I just got a 87 NA supra and it runs pretty good but i noticed at idle it kind of fluctuates, what do you think is causing this? how should i diagnose this?

04-10-2010, 01:32 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Start with what's suggested here: http://www.toyota-supra.info/forums/...le-issues.html Possibilities include: TPS, AFM, Vacuum Leak, Intake Leak, misfiring, improper ignition timing __________________ 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 --->

04-16-2010, 04:50 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	What have you actually checked? __________________ 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 --->

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04-10-2010, 01:52 AM	#3
jason7504 Intake Join Date: Apr 2010 Location: Vancouver, WA Posts: 48	here's a video

04-10-2010, 04:18 PM	#4
jason7504 Intake Join Date: Apr 2010 Location: Vancouver, WA Posts: 48	does that video point to anything specific?

04-16-2010, 12:15 AM	#5
jason7504 Intake Join Date: Apr 2010 Location: Vancouver, WA Posts: 48	would low oil pressure from some leaks cause the idle to fluctuate?

04-28-2010, 10:55 PM	#8
jason7504 Intake Join Date: Apr 2010 Location: Vancouver, WA Posts: 48	i think the spark plugs are misfiring because oil is leaking from the valve cover into the spark plug tubes