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Q45

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Question
Car stopped three times in one day
Hi. If the code is still present after both sensors have been replaced, and the engine is stalling, further diagnostics is needed. First of all, a new sensor doesn’t always mean a good sensor, especially aftermarket ones. Check the sensor...
Question
Car has rough idling, occasionally seems it would stall
Hello. Replacing the fuel injectors will not cause this. If it only stalls at idle, I would clean the throttle body first. If it is dirty, then this will occur. If it is fine, then it may be an air...
Question
Car misifires under load, P0300 code
Hello. The P0300 code refers to a detection of a misfire in one of the cylinders. If the car idles fine and only acts up during acceleration with this code coming up, then it is usually caused by a fuel...
Question
The new ignition is locked, cannot turn over
Hello. When you install a new ignition and a new computer, it needs to be reprogrammed to communicate correctly. This can usually only be done at the dealer. If they are not programmed correctly then the computers will not communicate...
Question
The car cannot be started at all
Hello. If the starter and the battery are in good shape then the battery cables need to be tested. These are common failures on this vehicle. If those are fine, then it is either an issue with the ignition switch...
Question
Check engine light stays on
Hello. In order to know why the light is on, I would need to know the codes from the computer. It can be anything for a computer issue to a bad gas cap. I usually scan the computer first to...
Question
Problem with knock sensor or coils
Hi there, many others have reported shaking during idle with the Q45 around that time. Replacing the coils has been reported to fix the issue, however there are other components that could be affecting the engine's smoothness as well so...
Question
Leaking fuel line
First of all, I recommend that you do not continue to drive. Fuel leaks can be very dangerous, it poses a great risk of a fire. I suggest having a trained technician locate the source leak and repair it before a...
Question
Air-ride air line blew out
There can be several reasons why the air suspension in your son's Infiniti is not functioning properly and a broken air line can definitely be one of them. Along with that, it is also possible for the air strut or...
Question
Car dies
There could be quite a few things that can cause this. Reading out faults from the engine computer will be key to guiding the diagnosis in the right direction. Depending on when the stalling occurs -- at idle, part load,...
Question
Not shifting from neutral
Hi, I would check and make sure your brake lights are working. Most cars won't let you shift gears if the computer doesn't see that your foot is on the brake. The computer knows if you are on the brakes...
Question
Replaced alternator but still not sending power to the battery.
Hello. If your engine is able to crank all the time and will not just start, the issue is not in the battery or the alternator. A good battery charge is required in order to even get the starter to...
Question
What else can cause a shake/vibration/shimmey?
Hello. Although you mention that you have new tires, there are instances where the construction of the tire is such that it will vibrate no matter how well it "appears" to be dynamically balanced. This is based on what...
Question
Getting to cylinder #3 to replace ignition coil?
I could go into a long drawn out direction to remove the coils on the engine but if you go on google and put in "2002 Infiniti q45 #3 coil removal" in the search bar you will see many good...
Question
I have a loss of power when acceleration the car does not drive pass 10 or 15mph I change the plugs and also change the fuel filte
This may be result of a failing or dirty mass airflow sensor. This is a unit that is responsible for regulating the air flow into the engine as it is mixed with fuel prior to being injected into the motor....

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