When starting the car cold, even after sitting for only 4-5 hours, there is a very strong fuel odor and the vehicle struggles to idle, does so very roughly and will occassionally stall. When pressing the accellerator during this time, the engine will shake violently. After 30-45 seconds, the engine smooths out and runs normally. No codes from ECC. Any ideas?
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I start with a question. Is your vehicle petrol or diesel? If is a diesel engine and you do have a cold start difficulties,be first check: a) your battery to be strong in power to manage a quick crank start. b) check your glow plugs whether are all working.( Even one glow plug does not work the engine can not start ).c) also check the Heat fuel system which normally is under the vehicle and close to the fuel tank( follow the fuel feeding lines to locate), d) also check whether the fuel pump ( electric ) located in the fuel tank is working. Always use a Diesel additive for Non-Frost. If is a Petrol engine again check to have a strong battery,also check whether the fuel pump in the tank is working. Also check whether you do have a clogged fuel filter.
the entire system must be in good working condition for a vehicle to start in cold weather. Strong battery, clean cable connections at the battery, good starter, clean/gapped plugs, clean injectors, good plug wires, clean fuel filter, clean air filer, and good gas. If a vehicle sits with a partially filled tank for long periods, condensation can form in the tank and freeze. Use gas line antiifreeze in the winter.
If your getting fuel which it sounds as though you are, check to see if your getting spark to the plugs. Sounds like an ignition system issue. Not sure about specifics on Hyundai but could be distributor cap, rotor, distributor, crank or cam shaft sensors.
Is the exhaust loud? If not it may not be an exhaust smell. I work at an exhaust shop and we have seen a few vehicles with the same issue. More often than not, it ends up being a fluid leak (usually oil) that has flowed on to an exhaust manifold or front pipe and on start up the fluid burns off, causing the odor. Once the fluid has burned off there is no more smell. This is no to say the leak has stopped, but the odor is less noticeable when the vehicle is moving and the fluid burns off a little at a time as opposed to all at once like it does on start up. Hope this helps to steer you in the right direction, good luck!
if you have tried starting it for a while , this can give off a petrol smell because if the engine isnt firing then the bores are getting floaded , the fuel cut off switch should only switch off for a reason ,, EG head on bump , part from that the switch could be faulty. but when the car runs after a short while and still stinks of fuel i would advise to get it checked out asap .. matdav69
These vehicles had issues with fuel pressure bleeding down when they sit for a period of time (like overnight). Nissan has issued a Technical Service Bulletin (TSB) on this issue.
There is a check valve in the fuel pump assembly that holds fuel in the fuel line so that fuel is readily available to the engine. This valve fails and allows that fuel to slowly drain back to the tank. The reason you have to crank the engine for a long period of time is that the fuel has to be pumped from the tank all the way to the engine- may take 10 seconds or more.
Once you start the vehicle, fuel is available and since the drain back to the tank is slow, restarting after even a few hours will be much easier.
The repair involves replacing the fuel pump "module" assembly (it's a service kit that contains the check valve mentioned earlier). The fuel pump assembly is removed from the tank and disassembled and reassembled with several new parts. This is a dealer-only repair. Depending on your level of expertise, you may be able to perform the repair yourself, but will have to buy the parts from the dealer.
Nissan Scope Technician- 10+ years experience in Nissan dealership.