My service engine light came on and when put on the machine it said evap gross leak

SOURCE: When i make a complete stop the cart takes a while to accelerate?

Millions of cars have that issue

The Evap System, will most easily be diagnosed &
your Gross Leak resolved,if you have a repair shop
with an EVAP Smoke Machine put on that system

The Gas Cap would be a PO442 (small leak) The way you
remember is, from the Hurst Olds 442, from the 1960's

The smoke test will blow some out the place of the leak,
like a rotted hose or broken evap valve.


Slow Acceleration---you work on after all check light issues
are resolved such as the evap leak.

Johnny Brown

• 5763 Answers
• Posted on Mar 05, 2011

SOURCE: evap control system gross leak

Okay, the code you got must be po455, the evap system is a system that is sealed or open and its for the fuel tank vapors, the computer controls it and if the computer closes the vent valve to seal the system and doesnt see the system build vac or pressure it turns on the light, this system takes the fumes from the tank and filters in through a carcoal canister and then it reburns it or releases it into the air after its filtered, this system is to help the ozone . you will not notice any diffrent driving just the light to tell you there a problem, a gross leak just means its looses vac fast, the most common reason for this may be the gas cap is loose or off, check the gas cap first, if its loose then tighten it and you will need to drive about 100miles depending on the type of driving you do, this will reset the light, if the cap is on and is tight then you may have a bad vent valve or a broken vacuum hose, this is not dangerous and wont leave you stuck on the road but i would have it checked to see what the problem is, this is only if its not the gas cap, heres a diagram to help you under stand it better, hope this is helpful have a good day.

SOURCE: service engine soon light

Sometimes if you leave your gas cap loose or you don't get it on right it can set this code. Check your gas cap and clear code with your scanner. If it comes back on you will need to take it into your dealer as it should be under warranty.

SOURCE: service engine soon light 04 nissan titan

make sure the gas cap is tightly sealed. Inspect the gasket on the gas cap