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Old 06-21-2011, 02:26 AM   #1
Conga1991
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Default 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??
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Old 06-22-2011, 12:11 AM   #2
Sonyps307
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Vacuum leak, o2 senser, tps, timing
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Old 06-22-2011, 06:28 AM   #3
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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.
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Old 06-23-2011, 12:39 AM   #4
Conga1991
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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??
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Old 06-23-2011, 01:06 AM   #5
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I don't think u can adjust the fuel pressure it works off of vacuum
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Old 06-23-2011, 02:08 AM   #6
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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.
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Old 06-23-2011, 02:16 AM   #7
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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.
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Old 06-23-2011, 02:34 AM   #8
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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.
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Old 06-23-2011, 02:39 AM   #9
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There's also the potential of a boost leak.
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Old 06-23-2011, 07:32 PM   #10
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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.
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