Question about Nissan Pathfinder
If you changed the maf sensor and you still get the code for it the problem could be in the wiring harness for the sensor. the ground in particular is important, but high resistance in the leads that report to the engine computer can also cause problems. it may be that if you replace that harness your other problems will go away. high exhaust pressure can cause problems for the cat but the cat does not cause that problem. without knowing what they are and what they are supposed to be that's a tough call. see what the maf wiring harness would cost and then you can decide whether you want to test it or just replace it. the only way to test it that will really tell you anything useful is a voltage drop test, in other words just testing that it will pass a small amount of voltage (that's all a continuity test will tell you) is not all that useful. it can pass that test and still be introducing unwanted resistance and reporting bad info to engine computer. high resistance in ground connection can also cause good sensor to pass bad info. maf is a powered sensor, needs five volt reference voltage, if connection is poor where 12v is split to 5v the reference voltage that is supposed to be 5v will be higher and all resulting inputs from sensor will be higher than they should be. hope that helps
Posted on Jun 16, 2009
The black smoke is obviously caused by unburned fuel in this case. Replacing the MAF was a good beginning. In addition, I would check the O2 sensors and then the catalytic converter. My MAF went bad a while back, resulting in my O2 sensors being ruined also. However, I was only getting the codes for the O2 sensors. The solution to replace your injectors is also a good one, but I would investigate the price differential between buying new ones and having your existing ones cleaned. You can usually have this done at auto shops.
Posted on Jun 15, 2009
Hi, my name is Dave. I believe you have one or more leaky fuel injectors. It could be the injector pintle valves or the O-rings that seal them to the fuel rail. You will need to attach a fuel pressure tester to the fuel rail, start the engine, shut it off, and then watch the rail pressure. If it drops rapidly, it is probably leaking past the deactivated injectors into the engine. That's why it's floode when you try and start it sometimes when it's warm. A cold engine likes lots of fuel for starting, not a warm one.
Posted on May 20, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
a hot start issue.
be related to low fuel pressure or problem with crank sensor.
it can be weak battery or starter.
possibilities are to be inspected to confirm what exactly it is.------
troubleshoot and confirm the issue,i suggest you refer few solved help links
with similar types of problem like yours:------
the link below:------
details will help.
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