Difficulty starting

vancouver874 · 07-21-2006, 12:02 AM

My son has an 87 Turbo Supra. It starts well after being run, at least for a few hours thereafter.
If it left longer than that (say overnight) it takes several attempts before it catches. It has new plugs and we have even tried leaving the ignition in the on (but not start) position thinking it may be the fuel pump. This doesn't make a difference. My son thinks it could be the cold start injector. Anybody have any thoughts.
Thanks

mrnickleye · 07-21-2006, 12:32 AM

The fuel pump only runs in the 'start' (cranking) position until the motor starts.

The cold start injector only operates below 66* (overnight?)

It also shuts off after 12 seconds(accumulated) of cranking, to avoid flooding.

You may have an injector, or the check valve in the tank, bleeding down the fuel pressure.

Perform a fuel pressure test to find out. A shop may be you best bet there, as you need the test equipment.

ddmcse · 07-21-2006, 12:26 PM

there is also a cold start switch/sensor aside from the cold start injector
it's mounted upfront near the thermostat housing .

i wouldn't just replace the cold start injector , i would take it out and try to get it cleaned before actually replacing it

http://www.cygnusx1.net/supra/librar.../ec/EC_04.html

see the BVSV in the diagram , thats not the cold start sensor but the sensor is just below that BVSV

SupraSaver87 · 07-21-2006, 10:23 PM

Just for troublshooting sake...I would also check your fuel filters, see if they are clogged, also run some fuel injector cleaner with the gas for a couple tanks. That should HELP to tell you if it's injectors, or at least if it is a dirty injector.

It could also be a worn out fuel pump, but then it would likely run crappy all the time. I agree with the first posts here, it is likely an injector clogged, or its something that is causing you to have low fuel pressure on a cold start.

Well I REALLY hope your son finds out what is wrong with it, and gets it fixed. Owning a supra is a hobbie in its self. You have to enjoy working on them, because regarless of how "Excelent" people say their supra's run...SOMETHING will always be there to piss you off when you don't want it to.

07-21-2006, 12:02 AM	#1
vancouver874 Stock Join Date: Jul 2006 Location: Vancouver BC Posts: 14	Difficulty starting My son has an 87 Turbo Supra. It starts well after being run, at least for a few hours thereafter. If it left longer than that (say overnight) it takes several attempts before it catches. It has new plugs and we have even tried leaving the ignition in the on (but not start) position thinking it may be the fuel pump. This doesn't make a difference. My son thinks it could be the cold start injector. Anybody have any thoughts. Thanks

07-21-2006, 12:32 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	The fuel pump only runs in the 'start' (cranking) position until the motor starts. The cold start injector only operates below 66* (overnight?) It also shuts off after 12 seconds(accumulated) of cranking, to avoid flooding. You may have an injector, or the check valve in the tank, bleeding down the fuel pressure. Perform a fuel pressure test to find out. A shop may be you best bet there, as you need the test equipment. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

07-21-2006, 12:26 PM	#3
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	there is also a cold start switch/sensor aside from the cold start injector it's mounted upfront near the thermostat housing . i wouldn't just replace the cold start injector , i would take it out and try to get it cleaned before actually replacing it http://www.cygnusx1.net/supra/librar.../ec/EC_04.html see the BVSV in the diagram , thats not the cold start sensor but the sensor is just below that BVSV __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

07-21-2006, 10:23 PM	#4
SupraSaver87 3" Exhaust Join Date: Jun 2006 Location: Manitoba Posts: 150	More things you could do Just for troublshooting sake...I would also check your fuel filters, see if they are clogged, also run some fuel injector cleaner with the gas for a couple tanks. That should HELP to tell you if it's injectors, or at least if it is a dirty injector. It could also be a worn out fuel pump, but then it would likely run crappy all the time. I agree with the first posts here, it is likely an injector clogged, or its something that is causing you to have low fuel pressure on a cold start. Well I REALLY hope your son finds out what is wrong with it, and gets it fixed. Owning a supra is a hobbie in its self. You have to enjoy working on them, because regarless of how "Excelent" people say their supra's run...SOMETHING will always be there to piss you off when you don't want it to. __________________ My Ride: http://www.cardomain.com/ride/2351563 Our Supra’s, which art in the driveway, Hollowed be thy power, thy mods are great, thy speed endless, On the road or at the track. Give us this day free of cops, And forgive us our impound charges, as we forgive those who are slow. And lead us not into speed traps, and deliver us from the interceptors, For thine is our car, the power, and the glory…forever and ever….amen.

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