Engine seems to be loading up with fuel and won't preform
I live in NE Ohio,I usually let my car warm up,last night when it was cold I let the car warm up for about 15 minutes,when I got into it I could smell raw fuel,also there was no preformance from the engine,it seems to bog down and use an overabundance of fuel.Also my check engine soon light came on.It has 159,000 on it but the preformance has been great up to now.
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There could be several things that would cause the symptoms.
First thing, is the "service engine soon" light on?
If it is, then you need to get any stored codes to help narrow the possibilities down. It would really be a help to you if you could get a scan tool that will actually show live data.
The reason I say that is, there are sensors which can cause your Buick to run rough, stumble, and belch after it warms up and not "throw a code".
The one sensor I know will do this is the coolant temperature SENSOR.
IF that particular sensor goes bad, it will NOT set off the service engine light, but it will tell the main computer that the engine is colder than it actually is. (It will usually default to tell the computer the engine temperature is -40° . Yup, you read that right. 40 degrees below zero.
When the computer thinks the engine is that cold (whether it's warmed up or not) it will keep the fuel mixture like the engine is cold. Sending signals to the injectors to keep dumping more fuel until the engine is warmed up. Problem is, according to the temp SENSOR, the engine is always cold so the 'puter keeps dumping the fuel to try to get the engine warmed up.
This is only one example and I'm NOT trying to encourage to "fire the parts cannon" at your car (replacing parts in hopes you fix the problem).
What I am trying to get you to do is, even if there is no service engine soon light, is to get someone to hook a scan tool that can read live data on an OBD I (on board diagnosis, 1st generation) to see if there is a sensor not giving the proper information to the computer.
Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.
When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.
I would be considering testing/replacing engine coolant temperature sensor. A faulty sensor can send signal that engine is already warm when it is still cold, thus, less fuel delivery than needed at time of engine being cold.
The sound could also be from the fuel pump. This comes on a cold engine. The way to sort it is to change your driving technique. Do not accelerate too much till the temp gauge starts showing the change. for the first minute or two if you do not accelerate too much then you may not hear the sound the rest of the day. Let the engine/fuel pump warm up a little and then you drive your normal self.
Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Otherwise, guesswork. I have MANY ideas that could send you on a wild goose chase. I strongly suspect EMS (Engine Management System) sensor beginning to malfunction as it warms up. First strong suspicion is the crank position sensor (CKP) - however,usually always sets a DTC (i.e., P0335, P0336). The next suspicion is the Engine Coolant Temperature sensor. The ECM uses this sensor's signal to adjust fuel, timing, engine RPM, etc based on engine temp. If malfunctioning at a particuar point during engine warm up, it could be telling the ECM the temperature is LOWER or HIGHER than it ACTUALLY is, resulting in the ECM to increase fuel (flood it) or give it LESS fuel (starve it). If this malfunction lasts long enough, the ECM will usually set a DTC for that sensor circuit, either a Range/Performance code, or a "LOW Input" or "HIGH Input" code.