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My car has started to sputter when accelerating. When it started, the sputtering only happened when I would be in higher gears such like 4th and 5th. It only happens when the car gets down between 1200 and 2200 RPMs. When I push the RPMs over the 2200 threshold it seems to go away.It has progressively gotten worse and the small sputters have gotten much worse. It has also started to sputter at certain times when accelerating from a stopped position. I have started with small changes such as fuel filters and fuel injector cleaning solutions. Not sure which direction I should go now. Trying to not have to take it to the shop. Any thoughts or suggestions?
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There is no check engine light on or any other indicator lights. FYI didn’t put this in the original post, it has about 180,000 miles on it and I have only had it for about 40,000 miles. Don’t know if that will change any of your thoughts.
Here is one possibility:
You should also perform a fuel pressure test to identify possible fuel pump/fuel pressure regulator issues:
You should also perform a fuel flow test to identify possible fuel line restrictions:
Here is how to perform an injector balance test to identify bad or dirty injectors:
I have started with small changes such as fuel filters and fuel injector cleaning solutions.
Here is how to perform a professional injector cleaning; you will need to use “GM Top Engine Cleaner:”
Here is a cheap, easy, & non-professional method:
Using a scan tool, further diagnosis would include observation of relevant PID data: short & long-term fuel trims, MAP/MAF, IAT, ECT and O2.
I am operating under the assumption that there is no fuel contamination (have you pissed anyone off recently? Married? Ex-wife?)
Making a lot of short trips without allowing time for your engine to warm up will accelerate carbon build up in your engine.
Good luck on ye’ endeavors. Be sure to let us know how this turns out.
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