Code error Lean/ bank 1 and 2 best guess?
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Code error Lean/ bank 1 and 2 best guess?
My 2000 lightning started running bad, well first the service engine light came on, then I noticed some pinging under load, then some erratic idle and missing.
I had the codes checked, it's running lean on both banks, the troubleshooting says Oxygen Sensor, MAF, but I have headers with 2 oxygen sensors, so the chances of Both being bad is long, so I'm thinking MAF??????
This truck has MANY upgrades, will , if you think I'm right about MAF, a stock MAF be ok, or is there aftermarket for upgraded motors?
Also, I have to say, I noticed a small exaust leak on one header due to missing bolt- could this have an effect on Oxygen sensor malfunction? Although then thats on one side, why would the ECU say lean on both banks??
I had the codes checked, it's running lean on both banks, the troubleshooting says Oxygen Sensor, MAF, but I have headers with 2 oxygen sensors, so the chances of Both being bad is long, so I'm thinking MAF??????
This truck has MANY upgrades, will , if you think I'm right about MAF, a stock MAF be ok, or is there aftermarket for upgraded motors?
Also, I have to say, I noticed a small exaust leak on one header due to missing bolt- could this have an effect on Oxygen sensor malfunction? Although then thats on one side, why would the ECU say lean on both banks??
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So I take some advice from here, I check the MAF,seems very clean itself-- but... There is oil all through the intake tube, in fact my filter was caked on the bottom with oil and dirt. This is a supercharged engine, so where is the oil coming from????
Does the pcv valve malfunction and alow this to happen??
Seems logical, but there is another intake tube to the other valve cover without any pcv valve or otherwise to block oil flow, although I know there is to be a filter or baffle on the inside of the valve cover to disrupt oil from coming up. But again this is supercharged, so with around 14 lbs of boost (aftermarket) would such oil be normal??
Does the pcv valve malfunction and alow this to happen??
Seems logical, but there is another intake tube to the other valve cover without any pcv valve or otherwise to block oil flow, although I know there is to be a filter or baffle on the inside of the valve cover to disrupt oil from coming up. But again this is supercharged, so with around 14 lbs of boost (aftermarket) would such oil be normal??
Hotshot
Joined: Jan 2004
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From: St Louis
Your codes of P0171 & P0174 are a very common combination.
You will likely find the cause to be the same as on the "standard" trucks. Best recommendation is to search the forum using keyword "p0171 p0174".
Steve
You will likely find the cause to be the same as on the "standard" trucks. Best recommendation is to search the forum using keyword "p0171 p0174".
Steve
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From: Louisville,Ky.
Oil in the air intake is from too much crankcase pressure. It could be from a faulty PCV valve or hose. The PCV hoses ae know to crack on N/A engines back behind the intake in a curved part. Not sure of the hose routing on the Lightning. Go ahead and spray the MAF elements with carb cleaner to see if it changes anything. It is either a vacuum leak or dirty MAF that usually cause both banks to show lean.
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ok, I'll shoot the MAF in the morning, I checked the hose from the pcv valve and the valve, the ball rattles, how you tell it's not functioning properly?? It must be extreme crankcase pressure cause I have a breather in place of the oil fill cap. Also, I think it's coming in through the second tube that comes from the valve cover opposite the pcv valve, this tube comes in right after the MAF, and before the throttle body, can this tube be eliminated and a breather be put on the outlet from the valve cover,caping the inlet to the intake tube?
Moderator
Joined: Dec 2001
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From: Louisville,Ky.
You could, but then it will just blow oil all over your engine compartment instead of the air intake. Did you check the PCV tubing real good for cracks?
Also make sure that there are no vacuum leaks between the TB and MAF. If it is getting air from anywhere else, it will run lean because the MAF is not seeing the added airflow.
Also make sure that there are no vacuum leaks between the TB and MAF. If it is getting air from anywhere else, it will run lean because the MAF is not seeing the added airflow.
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Check the PCV hose where it connects on the back of the intake manifold. You can't see it, so follow it with your hand and feel for any breaks. There's an odd connector on it that makes a 45 degree turn right where it slides onto the manifold. Mine tore right where it makes the turn and caused 171/174 codes and rough idle.
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ok, I'll check it today.
Are there aftermarket AIT sensors , or will a stock replacement be ok? I noticed the lean problem is only noticeable when outside air temp is above 75 degrees, makes me wonder if the AIT is working correctly.
Are there aftermarket AIT sensors , or will a stock replacement be ok? I noticed the lean problem is only noticeable when outside air temp is above 75 degrees, makes me wonder if the AIT is working correctly.
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The sensors indicate that the engine is running lean. One would immediately think that this is due to bad oxygen sensors. But, would all of them be bad at once? It's possible but not probable. You also mention that the engine is having idle problems. This is starting to sound like the Idle Air Control Valve. This valve is responsible for feeding the right amount of air into the engine at idle. If this valve is gummed up with carbon, it will cause the problems that you are describing. And, there are no codes to indicate when the IAC is bad. It is diagnosed symptomatically. Replace the IAC and see if it fixes the problem.
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