All o2 Sensors showing 0 Volts?
03-22-17, 06:09 PM
#16
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Has this vehicle ever run correctly since you have owned it? You really don't give us much information.
Pacesetter manifold? Did it run right before you replaced it? Did you change the O2 sensors when you replaced it? What type of anti-seize did you use on the O2 sensors if any?
Pacesetter manifold? Did it run right before you replaced it? Did you change the O2 sensors when you replaced it? What type of anti-seize did you use on the O2 sensors if any?
Yes I used pacesetters and I used denso o2's with and used the copper looking antisieze it came with. That was replaced prior to this happening however before and after that i always had lean code p0171 which does not show now oddly even being able to get it to operating temps and drive around in my yard.
03-22-17, 06:10 PM
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03-22-17, 07:50 PM
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Is there any codes?
The MAF sensor that you changed, was it brand new and the correct type? Because the 2jzgte maf also fits the plug too I think. Unplugging the MAF sensor would put the car into a type of safe mode because it cant read the amount of air coming accurately anymore.
Yip a vacuum leak would definitely cause problems especially under load depending how bad it is. If the leak is before the maf, then it doesn't matter too much just getting a little unfiltered air coming in. But if the leak is after the maf, then your getting un-metered air coming into the engine which is why its running lean.
You could try spray your carb cleaner around vacuum hoses and joins to see whether it idles higher. If it does, then you found the leak.
The MAF sensor that you changed, was it brand new and the correct type? Because the 2jzgte maf also fits the plug too I think. Unplugging the MAF sensor would put the car into a type of safe mode because it cant read the amount of air coming accurately anymore.
Yip a vacuum leak would definitely cause problems especially under load depending how bad it is. If the leak is before the maf, then it doesn't matter too much just getting a little unfiltered air coming in. But if the leak is after the maf, then your getting un-metered air coming into the engine which is why its running lean.
You could try spray your carb cleaner around vacuum hoses and joins to see whether it idles higher. If it does, then you found the leak.
03-22-17, 10:23 PM
#19
Thats good, so at least you found the air leak, hope theres no other leaks. That 19.5% ft means that the system was lean and it had add additional 19.5% on the pulse width of the injectors which is high amount. The max amount is + or - 10%. After fixing your leaks, that should bring the ft down
03-23-17, 12:36 AM
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Thats good, so at least you found the air leak, hope theres no other leaks. That 19.5% ft means that the system was lean and it had add additional 19.5% on the pulse width of the injectors which is high amount. The max amount is + or - 10%. After fixing your leaks, that should bring the ft down
03-23-17, 12:01 PM
#22
Thats great news mate, although the long term ft are still high though at around 16% - 19%. It might pay to reset the ecu and then let it idle for around 10- 20 minutes so the fuel trims can learn again since you fixed an a leak. So those current ltft might change depending how long you left it running after your tightened those bolts. Looks like oxygen sensors don't need replacement which is good. If the ltft stays the same after a period of time, then the system is still trying to compensate a lean mixture.
Things that could cause a lean mixture -
At the top of my head:
Sensors - maf reading a low amount of air, TPS reading low readings, coolant sensor can cause lean mixture too but only when the engine is cold.
Actuators - fuel pump wearing out (may only see problems when accelerating), fuel filter partially blocked (again may only see problems when accelerating), fuel leak (smell of fuel), leaky injector seals, Could also be ignition problems. You would need to to test the Coils and HT leads with a spark tester or just use a spark plug with a bigger than normal gap.
But also double check theres no vacuum leaks anywhere.
Things that could cause a lean mixture -
At the top of my head:
Sensors - maf reading a low amount of air, TPS reading low readings, coolant sensor can cause lean mixture too but only when the engine is cold.
Actuators - fuel pump wearing out (may only see problems when accelerating), fuel filter partially blocked (again may only see problems when accelerating), fuel leak (smell of fuel), leaky injector seals, Could also be ignition problems. You would need to to test the Coils and HT leads with a spark tester or just use a spark plug with a bigger than normal gap.
But also double check theres no vacuum leaks anywhere.
03-23-17, 07:05 PM
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Thats great news mate, although the long term ft are still high though at around 16% - 19%. It might pay to reset the ecu and then let it idle for around 10- 20 minutes so the fuel trims can learn again since you fixed an a leak. So those current ltft might change depending how long you left it running after your tightened those bolts. Looks like oxygen sensors don't need replacement which is good. If the ltft stays the same after a period of time, then the system is still trying to compensate a lean mixture.
Things that could cause a lean mixture -
At the top of my head:
Sensors - maf reading a low amount of air, TPS reading low readings, coolant sensor can cause lean mixture too but only when the engine is cold.
Actuators - fuel pump wearing out (may only see problems when accelerating), fuel filter partially blocked (again may only see problems when accelerating), fuel leak (smell of fuel), leaky injector seals, Could also be ignition problems. You would need to to test the Coils and HT leads with a spark tester or just use a spark plug with a bigger than normal gap.
But also double check theres no vacuum leaks anywhere.
Things that could cause a lean mixture -
At the top of my head:
Sensors - maf reading a low amount of air, TPS reading low readings, coolant sensor can cause lean mixture too but only when the engine is cold.
Actuators - fuel pump wearing out (may only see problems when accelerating), fuel filter partially blocked (again may only see problems when accelerating), fuel leak (smell of fuel), leaky injector seals, Could also be ignition problems. You would need to to test the Coils and HT leads with a spark tester or just use a spark plug with a bigger than normal gap.
But also double check theres no vacuum leaks anywhere.
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