Supra Problem!!

FunWheelDrive · 03-17-2008, 05:49 AM

When i start the car cold, it starts like a champ. Runs great, idles good, when cold idles at 1,200rpm when warm 700rpm. The only problem i'm having is after it's been running and i let it cool down then shut if off if i go to start it 15 minutes later it'll start then die, start then die, start than die, no matter what gas i give. Eventually i can keep it running by flooring the gas and it has a horrible misfire that clears up when i rev it high. I already change the spark plugs and wires. Runs really good otherwise.

Any help?

CyFi6 · 03-17-2008, 07:04 AM

I have issue with hot starts also, along with many others, although mine is not as bad as yours. From what i have read, the fuel in the rail gets so hot that it turns into vapor, and when you restart the car you are spraying out little liquid fuel.

My question is, is our fuel rail losing pressure when we turn the car off? There is supposed to be a good amount of pressure in the rail to keep fuel from boiling and doing this. Someone else needs to chime in.

supramacist · 03-17-2008, 06:46 PM

Maybe it's time for you 2 hip cats to upgrade to walbro fuel pumps if you haven't already.

FunWheelDrive · 03-17-2008, 08:42 PM

From what CY said it's not a fuel pressure problem when the car is running, its after the car turns off and has been sitting for 15-30 minutes.

supramacist · 03-18-2008, 02:26 AM

If it was a design flaw it would happen to specific makes and models.

Kind of like the head gasket crap.

Something has to be losing pressure if this is an issue.

The 1st place I would look??? The injector grommets.

If they are hard and brittle. And they probably are.

They're under 10$ at the dealership.

CyFi6 · 03-18-2008, 04:01 AM

the injector o-rings dont contain pressurized fuel pressure.

supradaddy0803 · 03-18-2008, 12:55 PM

Yes but the whole system is pressurized. If the grommets are brittle they will leak off the pressure and then you will have none when you try to start again. Hence the missfire. Check those and check your fuel pressure you will probaby be supprised at what you find. I think Supramacist had a post about this a long time ago or posted on someone elses thread. Granted it may not be that but if you replace them now then you will save yourself a problem with a gas leak. Which would you rather have.

supramacist · 03-18-2008, 02:53 PM

It may not be the o rings for the injectors.
It's just a swell place to start looking.

abhattan · 03-19-2008, 01:01 AM

Did you get any codes? Do you smell gas when you try to crank it when it's warm. Have you tested the fuel pressure? ECT sensor? I would check the ECT Sensor.

FunWheelDrive · 03-19-2008, 05:29 AM

ECT sensor? Sorry i'm new to supras, i smell no gas at all. If i turn it off and turn it on five minutes later it runs alittle rough, wait ten minutes, gets rougher still twenty minutes it's 5 times cranking it over. But if i wait an hour it runs like it's completely fine. The only time i ever saw a code come on is when i went WOT and did a hard 1-2 shift and and the car like stalled for a second then went back to going to accel.

03-17-2008, 05:49 AM	#1
FunWheelDrive Stock Join Date: Feb 2008 Location: Calgary Alberta/ Posts: 17	Supra Problem!! When i start the car cold, it starts like a champ. Runs great, idles good, when cold idles at 1,200rpm when warm 700rpm. The only problem i'm having is after it's been running and i let it cool down then shut if off if i go to start it 15 minutes later it'll start then die, start then die, start than die, no matter what gas i give. Eventually i can keep it running by flooring the gas and it has a horrible misfire that clears up when i rev it high. I already change the spark plugs and wires. Runs really good otherwise. Any help?

03-18-2008, 02:26 AM	#5
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	If it was a design flaw it would happen to specific makes and models. Kind of like the head gasket crap. Something has to be losing pressure if this is an issue. The 1st place I would look??? The injector grommets. If they are hard and brittle. And they probably are. They're under 10$ at the dealership. Last edited by supramacist; 03-18-2008 at 02:28 AM.

03-18-2008, 12:55 PM	#7
supradaddy0803 12psi boost Join Date: May 2006 Location: Athens, TX Posts: 308	Yes but the whole system is pressurized. If the grommets are brittle they will leak off the pressure and then you will have none when you try to start again. Hence the missfire. Check those and check your fuel pressure you will probaby be supprised at what you find. I think Supramacist had a post about this a long time ago or posted on someone elses thread. Granted it may not be that but if you replace them now then you will save yourself a problem with a gas leak. Which would you rather have. __________________ 1987 supra NA 5 speed 1JZGTE swap Tokico Illumina 2 and Eibach springs Tokico pillow blocks Suspension Techniques front and rear sway bar HKS super dragger cat-back exhaust plus test pipe Greddy Profec B spec 2 boost controller HKS type 1 turbo timer Supra sport solid steel drive shaft Walboro 255 fuel pump JZA70 Front end mod 18" Volk Racing AV3 18x8.5 front 18x9.5 rear

03-19-2008, 01:01 AM	#9
abhattan 3" Exhaust Join Date: Oct 2006 Location: Brentwood, New York Posts: 162	Did you get any codes? Do you smell gas when you try to crank it when it's warm. Have you tested the fuel pressure? ECT sensor? I would check the ECT Sensor. __________________ '91 Turbo Targa 5 Spd. '87 Corolla GT-S 5 Spd '91 Accord Daily Driver 5 Spd Soon to be rebuilt (All to some extent)

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03-17-2008, 07:04 AM	#2
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	I have issue with hot starts also, along with many others, although mine is not as bad as yours. From what i have read, the fuel in the rail gets so hot that it turns into vapor, and when you restart the car you are spraying out little liquid fuel. My question is, is our fuel rail losing pressure when we turn the car off? There is supposed to be a good amount of pressure in the rail to keep fuel from boiling and doing this. Someone else needs to chime in.

03-17-2008, 06:46 PM	#3
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	Maybe it's time for you 2 hip cats to upgrade to walbro fuel pumps if you haven't already.

03-17-2008, 08:42 PM	#4
FunWheelDrive Stock Join Date: Feb 2008 Location: Calgary Alberta/ Posts: 17	From what CY said it's not a fuel pressure problem when the car is running, its after the car turns off and has been sitting for 15-30 minutes.

03-18-2008, 04:01 AM	#6
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	the injector o-rings dont contain pressurized fuel pressure.

03-18-2008, 02:53 PM	#8
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	It may not be the o rings for the injectors. It's just a swell place to start looking.

03-19-2008, 05:29 AM	#10
FunWheelDrive Stock Join Date: Feb 2008 Location: Calgary Alberta/ Posts: 17	ECT sensor? Sorry i'm new to supras, i smell no gas at all. If i turn it off and turn it on five minutes later it runs alittle rough, wait ten minutes, gets rougher still twenty minutes it's 5 times cranking it over. But if i wait an hour it runs like it's completely fine. The only time i ever saw a code come on is when i went WOT and did a hard 1-2 shift and and the car like stalled for a second then went back to going to accel.