It has no mass air flow sensor &no crankshaft sensor on it
The engine is running rich. It is receiving more fuel than air. There are many things that can cause this. One of the most common issues on this engine is a stuck EGR valve. These valves tend to get stuck open with carbon deposits and will cause this problem. You can remove the valve and inspect the pintels on the bottom of the valve for being stuck open. Usually the larger pintel will be stuck open and you may actually see a piece of carbon causing it to be stuck open.
SOURCE: I have a 1999 oldsmobile
fuel pressure regulator on the fuel rail is probably it or the egr valve is stuck open allowing burnt fuel to flood the intake, im leaning towards the fuel pressure regulator because the o2sensor is probably reading rich or if its reading lean then i would choose the egr valve . good luck
SOURCE: car runs rough at idle
clean out ur throttle body, just follow the hose from the air filter to the throttle body. Need 2 people to do this. Don't remove the hose completely from the throttle body. Just enuff to be able to spray ur intake cleaner into the throttle body. Do this especially if its worse when the motor is hot, as this would confirm the problem.
SOURCE: 95 s-10 blazer idles rough
CHECK FOR A LEAKING INTAKE MANIFOLD GASKET, USE A CAN OF CARB SPRAY AND SPRAY AROUND THE TOP OF THE ENGINE, IF U HIT ON A LEAK U WILL HEAR THE ENG CHANGE TONE AND IDLE RPM.
SOURCE: 4.3 vortec runs OK cold, runs rough or dies warm
Your cylinder 4 misfire would most likely be a bad plug wire. And it is common for cars to have driveability problems with a crankshaft sensor code, esspecialy after the car has warmed up that is when you will notice the problem. The crank sensors are pretty simple to change and relativley inexpensive maybe around 40.00 for the part. If you look around the crank shaft pulley you will see a sensor with usually 2 bolts and a couple of wires attatched to it. If the vehicle gets to a point that it won't start, spin the motor over watching the tach on your dash and if it is not moving while cranking that means the sensor gave out. Good luck. swiftautorepairs.com
Hi there:
This code is set when the MAF (Mass Air Flow) meter is not sending the PCM the correct information. This can be due to a bad conection of the rubber intake hose between the MAF and the Throttle plate opening, a dirty air filter, a dirty mass air flow or a bad mass air flow.
Most programmer have you tie into the iat sensor in the mass air flow. this can cause the the iat sensor oto short out.
Hope helps.
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