Pontiac - Grandprix :: 2007 - Engine Starts To Run Really Rough And Tach Climbing Up
Feb 8, 2013
The car runs fine for several miles/minutes, suddenly the tach starts to climb, up a jump, then up again. This is when the engine starts to run really rough and I pull off the road, let the car cool down and make it the rest of the way to work (about 15 miles).
Here is what I have done: Radiator flush and fill; Oil and filter change; Cleaned EGR and replaced gasket; put in new spark plugs; changed the transmission filter and oil; replaced the O2 upstream and downstream sensors; replaced the thermostat 195 to 180; replace the coolant temp sensor.
The check engine light does not come on (except on start-up check sequence), so it is working. Their are no trouble codes (other than when I removed the downstream O2 sensor to check if I would get errors). The cat converter doesn't glow at night, and doesn't rattle when tapped. The resonator in the exhaust does make a rattling sound, but I don't see why that would be the problem.
I am at my wits end. Any clue what I should try next? The water pump isn't leaking.
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I travel to get to work, and on the way I use the interstate. Speed is posted at 55, naturally, but in the fast lane - the left-most lane of 4 - you have to keep up, you understand. Fast lane is usually 65 to 70.So I'm traveling on the Interstate and in order to use the faster lanes than the right lane I depress the accelerator, and the car - 1998 Pontiac Grand Prix - speeds up, as you would expect. However, when it reaches about 45 to 50 mph the car begins to ... cough. Just a little. If I step on the gas harder so that overdrive kicks in the car stops 'coughing'. As I decelerate there is no coughing, only when I am speeding up and hit that 45 to 50 mph barrier.What is causing this?
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Smoke/steam (smells burned) is coming from behind the engine and when the wheels are turned, it sounds like a high pitched grinding noise. I checked the oil, its fine. I filled the radiator with water as a temporary fix until I can afford to get the radiator fixed or repaired. Air conditioning only works on max setting. Before the problem occurred, I was pouring water into the extra reservoir when my friend started the car. Maybe the radiator sucked up some air while I was filling the reservoir.
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2002 Pontiac Grand Prix with about 152k miles on it
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In addition, on occasions it has died while at idle or coasting to a stoplight. After it dies it will fire back up no problem.
Fuel problem perhaps?
The "Service Engine Soon" light has been on for about a month before it started acting up. I had the codes checked at AutoZone and it came up with P0442 and P0128.
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1990 Pontiac Grand Prix with 121000 miles. Scan shows all items within limits or normal.
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