Service Engine Soon light and corresponding codes; diagnostic help requested
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Overlanding
Joined: Oct 2007
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Service Engine Soon light and corresponding codes; diagnostic help requested
99 Discovery Series II, 130k miles
Problem: Service Engine Light comes on and stays on(flashes for a few seconds only)
Question: Whatshould Ido to resolve the following trouble codes?
P0300 Misfire On Multiple Cylinder
P0301Misfire Cylinder 1
P0303 Misfire Cylinder 3
P0305 Misfire Cylinder 5
P0307 Misfire Cylinder 7
P0130 Oxygen Sensor Cycle Fault Bank A of the engine Upstream of the Catalytic Converter
P0171 Oxygen Sensor System Too Lean Fault Bank A
P0174 Oxygen Sensor System Too Lean Fault Bank B
Note: I have already replaced the fuel filler cap
Thanks in advance,
Calvin
Problem: Service Engine Light comes on and stays on(flashes for a few seconds only)
Question: Whatshould Ido to resolve the following trouble codes?
P0300 Misfire On Multiple Cylinder
P0301Misfire Cylinder 1
P0303 Misfire Cylinder 3
P0305 Misfire Cylinder 5
P0307 Misfire Cylinder 7
P0130 Oxygen Sensor Cycle Fault Bank A of the engine Upstream of the Catalytic Converter
P0171 Oxygen Sensor System Too Lean Fault Bank A
P0174 Oxygen Sensor System Too Lean Fault Bank B
Note: I have already replaced the fuel filler cap
Thanks in advance,
Calvin
Pro Wrench
Joined: Feb 2008
Posts: 1,706
Likes: 3
From: Meridian, Idaho
RE: Service Engine Soon light and corresponding codes; diagnostic help requested
Do you know when the last time the vehicle has had its spark plugs and connectors replaced? It might be the o2 sensors too if they have not been replaced for awhile. But with misfirings it is most likely the spark plugs and wires. Make sure they are magnecores because if they are not... thats probably the problem.
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Overlanding
Joined: Oct 2007
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RE: Service Engine Soon light and corresponding codes; diagnostic help requested
I bought the vehicle less than a year ago so I do not know.
I checked the spark plugs and they are Champion RCIIPYPB4's andwires are RISTS Suppression 2015 Silicone's.
I checked the spark plugs and they are Champion RCIIPYPB4's andwires are RISTS Suppression 2015 Silicone's.
RE: Service Engine Soon light and corresponding codes; diagnostic help requested
Replace the plugs and wires, then clear the codes and see what ones come back.
Get the Magnecor plug wires or you will be doing it again in a month.
www.atlanticbritish.com
Get the Magnecor plug wires or you will be doing it again in a month.
www.atlanticbritish.com
Rock Crawling
Joined: Sep 2008
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RE: Service Engine Soon light and corresponding codes; diagnostic help requested
It sounds like you have a hefty vacuum leak on your hands. With the engine running, spray a little water down on both sides of the intake manifold, if the engine bogs down and you get white smoke out of the tailpipe(once the engine is fully warm), you should look into R&R'ing the intake manifold gasket, consider new injector o-rings. I would have a shop smoke test the intake system to confirm as well where the leak is coming from. Lean faults don't happen for no reason, and lack of spark will result in excessive fuel and a rich fault. If it has been happening for a while, your upstream sensors may be fouled, too. Check to see if your heads are leaking, if they are, then do those, as the intake will be done at the same time.
RE: Service Engine Soon light and corresponding codes; diagnostic help requested
ORIGINAL: tacomatech
It sounds like you have a hefty vacuum leak on your hands. With the engine running, spray a little water down on both sides of the intake manifold, if the engine bogs down and you get white smoke out of the tailpipe(once the engine is fully warm), you should look into R&R'ing the intake manifold gasket, consider new injector o-rings. I would have a shop smoke test the intake system to confirm as well where the leak is coming from. Lean faults don't happen for no reason, and lack of spark will result in excessive fuel and a rich fault. If it has been happening for a while, your upstream sensors may be fouled, too. Check to see if your heads are leaking, if they are, then do those, as the intake will be done at the same time.
It sounds like you have a hefty vacuum leak on your hands. With the engine running, spray a little water down on both sides of the intake manifold, if the engine bogs down and you get white smoke out of the tailpipe(once the engine is fully warm), you should look into R&R'ing the intake manifold gasket, consider new injector o-rings. I would have a shop smoke test the intake system to confirm as well where the leak is coming from. Lean faults don't happen for no reason, and lack of spark will result in excessive fuel and a rich fault. If it has been happening for a while, your upstream sensors may be fouled, too. Check to see if your heads are leaking, if they are, then do those, as the intake will be done at the same time.
Administrator
Joined: Apr 2006
Posts: 25,707
Likes: 107
From: Denver, Colorado
RE: Service Engine Soon light and corresponding codes; diagnostic help requested
With your codes, plugs and wires are a must, especially the 8 mm Magnacor wires. Based on your mileage, the 4 02's should all be replaced to correct your 02 codes which will probably clear the lean run codes.
Remember do not install a K&N air filter, use a factory paper filter for best results.
Remember do not install a K&N air filter, use a factory paper filter for best results.
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Overlanding
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RE: Service Engine Soon light and corresponding codes; diagnostic help requested
Mike,
British Atlantic only carries 7 mm Magnedor'sfor that model. Are they adequate or should I search elsewhere for the 8 mm's?
Do you have a suggestion for plugs? The manual calls for Champion RC11PYPB4.
Also,is it really required to remove the intake manifold to replace the plug wires?
Thanks,
Calvin
British Atlantic only carries 7 mm Magnedor'sfor that model. Are they adequate or should I search elsewhere for the 8 mm's?
Do you have a suggestion for plugs? The manual calls for Champion RC11PYPB4.
Also,is it really required to remove the intake manifold to replace the plug wires?
Thanks,
Calvin
RE: Service Engine Soon light and corresponding codes; diagnostic help requested
The 7mm's will do just fine, www.roverconnection.com has the 8mm's.
The Champion plugs will be just fine, I recomend Iridium plugs.
Yes you can replace the plug wires without removing the intake plenum. There is a good write up on it a few pages back.
The Champion plugs will be just fine, I recomend Iridium plugs.
Yes you can replace the plug wires without removing the intake plenum. There is a good write up on it a few pages back.
Rock Crawling
Joined: Sep 2008
Posts: 311
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RE: Service Engine Soon light and corresponding codes; diagnostic help requested
Just because it sets a lean fault, doesn't mean the sensor is bad. Your sensors are probably fine, and unless after repairing the air leak they still stay lean, I would not say theyneed to be replaced.