fuel smell when starting my 2005 pontiac gran prix (vehicles, mileage, engine)
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My Pontiac is in the shop as we speak. The tach was bouncing around and it did not have any power. The check engine light was on but the mechanic has not found any issues yet. I noticed that sometimes it hard to start and there is a smell like the injectors are flooded. Any ideas on what causes this ?
50% chance your CEL is for "engine operating temp not reached", possibly code 1296 or something similar, not sure on GM vehicles. Simple and easy fix if it is, any decent tech should be able to tell instantly. The coolant temp sensor (there are most likely two as a failsafe, one goes to the gauge cluster, one to the computer they are most likely not interconnected, again not sure on GM). Sounds like your car thinks the engine block is cold and is trying to dump large amounts of fuel in to help it reach correct operating temperature. I could be wrong here but there was not much info posted here, do you know what code it was throwing?? Did the car seem to be running colder than usual by the gauge cluster?
For the sake of diagnostic reasons, the CEL is a great tool if you can read the code. Autozone will do it for free, and you canbuy OBDII scanners for under $100 these days. A mechanic usually charged $90/hr or so for the same service.
Since no code number was posted, it could be a number of things. We would really be making educated guesses at this point. The code could be a misfire code, or a lean/rich code, or a MAF code? etc etc.
First, check to see if the car has a serviceable fuel filter. General Motors located the fuel filter in the gas tank starting with some mid-2000s models and making them not serviceable. If the fuel filter is serviceable, it should be replaced every 15,000 miles.
Second, check to see if the engine and fuel injectors are clogged up with deposits and accumulation from carbon and ethanol particles. A complete fuel system cleaning, servicing the intake manifold, throttle body and fuel line, will help clean the system and restore horsepower and fuel mileage. Fuel system services are recommended every 15,000 miles.
If a car has a serviceable fuel filter, both the fuel filter and fuel system cleaning services should be done together. Replace the fuel filter first, then perform the fuel system cleaning.
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