Engine is adding to much fuel

Conga1991 · 06-21-2011, 01:26 AM

So after starting my car finally. too much fuel is being added and is fowling up the spark plugs. What are some things I should look into to fix the problem. I have a SAFC 1, I want to put it in but I dont know what my settings are suppose to be. anyone have one and can tell me what my settings should be??

Sonyps307 · 06-21-2011, 11:11 PM

Vacuum leak, o2 senser, tps, timing

Nathaninwa · 06-22-2011, 05:28 AM

I've had cold start injectors stick on me as well. I see your up in puyallup, I'm in aberdeen and ran my supra 2 years with no csi at all. Just took a few extra cranks in the morning to start up.

Conga1991 · 06-22-2011, 11:39 PM

There is no vaccuum leak, o2 sensor is brand new, timing is perfect. Im considering that it might be the tps since when I tried checkin the continuity the numbers werent even in range of what tsrm was showing. Also a friend of mine said to adjust the stock fuel pressure regulator... would this help the fact there is too much fuel??

Sonyps307 · 06-23-2011, 12:06 AM

I don't think u can adjust the fuel pressure it works off of vacuum

Nathaninwa · 06-23-2011, 01:08 AM

Other problems to look at are, pull the vacuum line off the fpr, it could have a torn diaphram and sucking gas throught the hose into the intake.

Also, check for exhaust leaks at the head and cracked manifolds Any leaks here will draft in fresh air, leaning out the mixture and Oxygen sensor will indicate this to the ECU and richen the mixture up.

I like to check tps volts instead of the ohms readings. Read the thread I started on TPS voltages a few days ago.

Also, the TCCS system Toyota used is very clever. Google the VF signal in the check connector. Its a checkup on the ECU side of things post O2 correction. its a simple 1 to 5 volt staged voltage check and lets you know if the ECU is adding fuel, or taking fuel away when the engine is up to tempurature.

Check it out.

cre · 06-23-2011, 01:16 AM

How have you determined it's running excessively rich?

No, the stock FPR is not adjustable and adjusting the pressure would just be hiding an existing problem.

Is it rich at idle? While driving? At WOT? And again... how do you know its running rich.

What else have you tested? Coolant sensor? Plug wires? Coil(s)?

BTW, the SAFC setting will need to be tailored to your specific vehicle. If it's a stock system you're usually wasting your time but you'll still want to be tuning it on a dyno. With the SAFC installed and all setting at zero there should be NO difference in how the engine operates.

Nathaninwa · 06-23-2011, 01:34 AM

Ah yes, the coolant temp sensor. My supra had a wierd stumble under boost and for the life me I could not get it figured out...ran great other wise in cruise, and minimul boost....turned out the coolent temp sender was almost corroded to the point it was about to fall off. Changed sensor and pigtail, problem solved.

cre · 06-23-2011, 01:39 AM

There's also the potential of a boost leak.

Conga1991 · 06-23-2011, 06:32 PM

To Cre- When I start my car I would have to have my foot on the accelerator and keep pumping it til I got it to idle high and whenever I let off the gas it will idle low then stumble. buut when I do try to drive it, there is no power and it's idling pretty high and it wouldnt go past 10mph.

06-21-2011, 01:26 AM	#1
Conga1991 3" Exhaust Join Date: Jun 2009 Location: Avondale, AZ Posts: 169	Engine is adding to much fuel So after starting my car finally. too much fuel is being added and is fowling up the spark plugs. What are some things I should look into to fix the problem. I have a SAFC 1, I want to put it in but I dont know what my settings are suppose to be. anyone have one and can tell me what my settings should be??

06-23-2011, 01:16 AM	#7
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	How have you determined it's running excessively rich? No, the stock FPR is not adjustable and adjusting the pressure would just be hiding an existing problem. Is it rich at idle? While driving? At WOT? And again... how do you know its running rich. What else have you tested? Coolant sensor? Plug wires? Coil(s)? BTW, the SAFC setting will need to be tailored to your specific vehicle. If it's a stock system you're usually wasting your time but you'll still want to be tuning it on a dyno. With the SAFC installed and all setting at zero there should be NO difference in how the engine operates. __________________ 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 --->

06-23-2011, 01:39 AM	#9
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	There's also the potential of a boost leak. __________________ 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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06-21-2011, 11:11 PM	#2
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	Vacuum leak, o2 senser, tps, timing

06-22-2011, 05:28 AM	#3
Nathaninwa Intake Join Date: Jun 2011 Location: Aberdeen, WA Posts: 43	I've had cold start injectors stick on me as well. I see your up in puyallup, I'm in aberdeen and ran my supra 2 years with no csi at all. Just took a few extra cranks in the morning to start up.

06-22-2011, 11:39 PM	#4
Conga1991 3" Exhaust Join Date: Jun 2009 Location: Avondale, AZ Posts: 169	There is no vaccuum leak, o2 sensor is brand new, timing is perfect. Im considering that it might be the tps since when I tried checkin the continuity the numbers werent even in range of what tsrm was showing. Also a friend of mine said to adjust the stock fuel pressure regulator... would this help the fact there is too much fuel??

06-23-2011, 12:06 AM	#5
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	I don't think u can adjust the fuel pressure it works off of vacuum

06-23-2011, 01:08 AM	#6
Nathaninwa Intake Join Date: Jun 2011 Location: Aberdeen, WA Posts: 43	Other problems to look at are, pull the vacuum line off the fpr, it could have a torn diaphram and sucking gas throught the hose into the intake. Also, check for exhaust leaks at the head and cracked manifolds Any leaks here will draft in fresh air, leaning out the mixture and Oxygen sensor will indicate this to the ECU and richen the mixture up. I like to check tps volts instead of the ohms readings. Read the thread I started on TPS voltages a few days ago. Also, the TCCS system Toyota used is very clever. Google the VF signal in the check connector. Its a checkup on the ECU side of things post O2 correction. its a simple 1 to 5 volt staged voltage check and lets you know if the ECU is adding fuel, or taking fuel away when the engine is up to tempurature. Check it out.

06-23-2011, 01:34 AM	#8
Nathaninwa Intake Join Date: Jun 2011 Location: Aberdeen, WA Posts: 43	Ah yes, the coolant temp sensor. My supra had a wierd stumble under boost and for the life me I could not get it figured out...ran great other wise in cruise, and minimul boost....turned out the coolent temp sender was almost corroded to the point it was about to fall off. Changed sensor and pigtail, problem solved.

06-23-2011, 06:32 PM	#10
Conga1991 3" Exhaust Join Date: Jun 2009 Location: Avondale, AZ Posts: 169	To Cre- When I start my car I would have to have my foot on the accelerator and keep pumping it til I got it to idle high and whenever I let off the gas it will idle low then stumble. buut when I do try to drive it, there is no power and it's idling pretty high and it wouldnt go past 10mph.