I am looking to diagnose a reoccurring problem that seems to be getting worse
What is your question?
my cavalier convertible has a list of symptoms as follows..1)cold start issues (always), cranking it 5 times before it starts 2) very rough idle at times 3) running way too rich (always) 3) poor gas mileage (always) 4) stalls when coming to a stop (sometimes) 5) running hotter than normal (always) 6) hesitation (jerking) upon acceleration from a stop (sometimes)7) excessive carbon build up, sometimes backfiring on start 8) idle will fluctuate up and down even in drive (sometimes)...The problem seems to be getting worse............the vehicle has 123,000 miles and no check engine light is on. Can one sensor be causing all these issues???
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Sounds like it is possibly a fouled or failed catalytic converter that needs to be checked and replaced. Another symptom would be: Vechicle sputters under hard acceleration while going up an incline or hill.
2 common problems were fuel injectors sticking open or a fuel pressure regulator that is leaking. Remove the vacuum line from the pressure regulator and see if fuel is leaking out of it. If it is leaking fuel it needs to be replaced. A shop would have to check for a stuck injector.
