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First thing to check is the fuel pump relay. IT could also be that big air clearner hose. If that is broken or cracked anywhere these it will cause over fuelling.
it could be the main assembly relay under the drivers kickpanel
The main relay will give an check engine light to indicate that the electrical system is bad.
it may not be you ignition relay, but your alternator.
yes and ignition relay would..
Could be a main engine relay problem.
Yes, the main relay is also known as the fuel pump relay. When one fails in can create a slue of different problems for the car such as turning the car off while driving.
In the engine compartment there is a power distribution box ( used to be called the relay panel ) and depending on the year there were also what was referred to as engine compartment Relay Module # 1 and engine compartment Relay Module # 2 . If you are looking for a specific relay knowing the year would be a big help.
This is not the cause, this relay is to start the and run the compressor (Basically) and it will not cause the system to lower overnight.
My ignition relay was damaged and it caused my starter to go out, which cause my car to shut down.
Any relay could be the cause.
It could be a variety of things, all having to do with the cooling system. Most likely it is a faulty engine fan that is supposed to automatically cut on when your engine hits a certain temp. It could the the fan motor itself, the relay that controls the fan, and maybe just a fuse. If the car does not overheat AT ALL in freeway driving (lots of cool air passing over the engine constantly) and overheats either idling or during city driving that engine fan is to blame.