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Re: gas and petrol problem
Might be time to change plugs.Use NGK V Grooves.Also could be that you have not run on petrol for a while?Gas is a smoother running fuel than petrol and an engine must run on petrol correctly before tuning gas.Check that H/T leads and distributor are in a good servicable condition.Make sure you have no engine vacuum leaks.Let me know how you go and if you need further help.I fit and repair LPG vehicles on a daily basis.
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first you did not mention your car brand. Anyhow its not seem ens a big problem.what i understand is your car advances not working properly & secondly your car ignition coil(s) or both plug cods & coils.
in last your car can not maintaining low rpm it might be from throttle body idling switch or main butterfly ..... or might be your car Tappet sating out or some head valves are jam ..do a proper check from codified mechanic ..... this is a basic of your car, now if you need any further help you can mail me on email@example.com... best of luck....
Petrol or Diesel? If petrol it's probably engine coolant temperature sender and if diesel it could be a defective glow plug or cold start device/pump timing.How you had glow plug draw test done?Is there any smoke and if so what colour?
If O2 sensor is bad it can cause Rough running. Are you sure it is the O2 sensor ratteling? Have you taken it out to hear Rattle? Is it loose? I have not Hears an O2 Sensor rattle. I have heard Converters Rattle. over time Inner Material of converter will Not have a tight fit due to heating and cooling. expanding and contracting. carses some of the material to wear away. Causing the it to rattle. and can cause rough running also.