Wierd Idle
05-19-2006, 05:42 AM
#1
2nd Gear Member
Thread Starter
Join Date: May 2006
Posts: 196
Wierd Idle
I have noticed that sometimes when my car is sitting at idle, it seems to rev on its own. When I first start the car up and drive for a while the idle is perfect around 7-800rpm. However when hot it revs up around 1000rpm and then drops and continues to do this. Also the oil pressure drops with the rev as well, sometimes the volt meter as well. I was thinking it might be the supercharger catching up but I have no idea. Any help?
Stats: 87 GT, Powerdyne Supercharger, 24lb injectors, maf conversion.
PS: There is one skinny vacuum line that comes off the tree to the left of the motor that I cant figure out where it goes??
Stats: 87 GT, Powerdyne Supercharger, 24lb injectors, maf conversion.
PS: There is one skinny vacuum line that comes off the tree to the left of the motor that I cant figure out where it goes??
05-19-2006, 04:47 PM
#6
2nd Gear Member
Join Date: Dec 2005
Location:
Posts: 296
RE: Wierd Idle
ya i have same problem but im missing the vacuum line from the right side instead of left. But i know the one tree on the left go to fuel presure, vacuum check valve, s/s hook up to brake boost.
http://www.veryuseful.com/mustang/te...uumDiagram.jpg
hope this helps.
http://www.veryuseful.com/mustang/te...uumDiagram.jpg
hope this helps.
05-22-2006, 12:42 AM
#7
1st Gear Member
Join Date: Nov 2005
Posts: 92
RE: Wierd Idle
well the oil pressure and volts will drop when your idle drops down, i also have an 87 and when my car starts to lope real hard or surge the oil pressure and volts drop acoordingly, as for the tree on the drivers side i can look at mine and see where the vacuum lines are running
05-22-2006, 02:54 AM
#9
1st Gear Member
Join Date: Apr 2006
Posts: 125
RE: Wierd Idle
Buy some chance are you vaccum lines hooked up wrong?
ORIGINAL: Grinster24
I have noticed that sometimes when my car is sitting at idle, it seems to rev on its own. When I first start the car up and drive for a while the idle is perfect around 7-800rpm. However when hot it revs up around 1000rpm and then drops and continues to do this. Also the oil pressure drops with the rev as well, sometimes the volt meter as well. I was thinking it might be the supercharger catching up but I have no idea. Any help?
Stats: 87 GT, Powerdyne Supercharger, 24lb injectors, maf conversion.
PS: There is one skinny vacuum line that comes off the tree to the left of the motor that I cant figure out where it goes??
I have noticed that sometimes when my car is sitting at idle, it seems to rev on its own. When I first start the car up and drive for a while the idle is perfect around 7-800rpm. However when hot it revs up around 1000rpm and then drops and continues to do this. Also the oil pressure drops with the rev as well, sometimes the volt meter as well. I was thinking it might be the supercharger catching up but I have no idea. Any help?
Stats: 87 GT, Powerdyne Supercharger, 24lb injectors, maf conversion.
PS: There is one skinny vacuum line that comes off the tree to the left of the motor that I cant figure out where it goes??
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