Has good spark and fuel supply when it runs rough.Service light may or may not come on. also pukes black smoke during bad episodes.runs great most of the time but if you shut it off during bad episode it will not start for a few minutes.
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Re: occasionally runs rough
This sounds like your catalayic converter is plugged hence the black smoke at start up. your engine needs to breath and a plugged converter will make the engine run rough and have hard starting. please rate this
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Black smoke could be oil burning or unburned gas going out the exhaust. Blackened plugs and running very rough could be too much gas in the cylinders. Check fuel pressure, check fuel pressure regulator-look for evidence of gas in the vacuum line to the regulator- a sign the regulator is bad allowing excess gas into the engine. If fuel pressure is correct, check for leaking injectors, also check ignition system. Do you have a strong blue spark?
Smoke is not a good sign. Running rough is not a good sign. Oil light not a good sign. You could have a combination of bad things, most likely expensive. Suggest professional help. Smoke can be bad rings or holed piston. Low oil pressure can be bad bearing or oil pump.
With petrol engines it is usually best to start at the spark plugs , being in my sixties and the old school , I use the old methods . Spark plugs indicate a lot , they are the business end of what makes it all work . If they are very fouled up black and oily , it usually indicates bad mixture of fuel and air , if they are oily black it may mean heavy cylinder wear etc spark plug manufactuurers are usually happy to supply a diagram with all the indicators on it .
signs of a bad fuel pressure regulator-- the vehicle will run rough, the engine will not start ( usually in the mornings,) many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. replacement is only cure. 1- black soot on plugs-2-black smoke from tailpipe-3- running rough-4- stalling, good-day! repost if need be.
A bad coolant temp sensor for the ECM will cause that problem ... they are cheap and easy to replace. One other possibility is a piece of carbon stuck in the EGR causing an internal vacuum leak .. Good luck.
White smoke visible on the tailpipe? As a first course of action, I strongly suggest that you have an engine tune up, replace the spark plugs and fuel filter as well. This will surely give better fuel burning, rough idle and bad smell can be eliminated.
Hope this helps and thank you for using FixYa! Have a good one!
Sounds like bad injectors, bad O2 sensors, and or too much fuel psi. Check the fuel psi against what the service manual says. If the fuel psi is too high, your regulator is bad. If the fuel psi checks out ok, you likely have a bad O2 or bad fuel injector(s).