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I'm assuming this is a carburettor engine. Is this carbon build up happening to just one plug or all of them? Try a simple service. Replace a?>ll of the spark plugs and the air filter.
Just one plug fouling is possibly an issue with the plug itself. Spark plugs need to be the correct one for that engine setup and must be gapped correctly. The wrong plug or the wrong gap setting will cause a poor fuel burn causing the carbon build up.
If all the plugs are fouling it could be either a dirty air filter or an issue with the carburettor itself. If these are the original carburettor you could get a good mechanic to service your carb. Fuel can leave a 'varnish' on surfaces which can clog fuel lines and jets.
Some dash symbols. As you said if it is the radiator symbol should be talking about low coolant in the radiator or reservoir. Not sure how clear you see it but there is a symbol for convertor/exhaust system which might look like radiator depending how clear you can see it. Well here is a few which you can see if it matches yours.
I saw a pdf owners manual for a 07 Isuzu npr I will post at bottom if it helps. https://www.autoguide.com/auto-news/2015/07/what-does-the-light-on-my-dash-mean-.html
Tune ups can radically change emission output due to the burn ratios. By burn ratios I mean the ratio of air, fuel mixture and time/amount of spark. If your burning to much or not enough fuel due to one of the fore mentioned it can cause nasty emissions. Not enough spark causes the ignition of the fuel to be delayed and hence a increase in the amount of fuel burned upon ignition, which increases bad emissions. Exhaust leaks or the catalytic convertor being well used are both culprits also. Exhaust leaks cause particles within normal emissions to solidify within the exhaust (most commonly carbon) then down the line they heat up and burn away into bad emissions. There is always some carbon build up within the exhaust system which is what the catalytic convertor is for. It acts as a filter to scrub away the carbon and other nasty particulates from the exhaust gases. Some of the particulates within will burn up due to normal use and create bad exhaust so when the convertor has a significant build up it needs to be replaced. A plugged catalytic convertor forces the engine to burn exhaust with the air and fuel when mixing which is not a good idea because it retards the engine (definitely bad for the environment and the engine - and the pocket book). I have seen a cheap and seemingly mundane fix work on numerous occasion, simply replace the gas cap. It has to due with the cap making a seal. If it does not seal properly the tank can suck in air during usage which lets more air into the fuel lines when pumped, which in turn increases the air to fuel mixture when sparked. That is always the cheapest fix but keeping up all other things with regular maintenance all really help the environment. Without proper testing it is impossible to guess what the actual culprit is but I hope this has helped both you and the environment.
i presume it is a 2 stroke ,i have done it by removing exhaust and getting a blowtorch oxyaceteline and pointing flame into exhaust neck to start burning the carbon out for about 30 seconds and then straight away blowing into the same end of pipe you have heated up with compressed air to feed the burn,MAKE SURE FLAME TORCH IS SWITCHED OFF )then keep compressed air nozzle blowing trough the pipe and you can see how the burn runs along the inside of the pipe as the carbon burns out ,it takes about 4mins to burn all the way along inside of pipe <be warned it is a messy smokey job <if you are not technically skilled id suggest removing your pipe and assking an exhaust shop to assist you to do it
Hello. This is not good. Hate to say it but you will need to check for compression on all cylinders as it sounds like you may have a bad head gasket. Joe
by swapping vaccum hoses on front diff shift on fly unit you can get out of 4wd or vise versa or by removing and sliding sleeve ring inside diff tube over, check range selection detent switch on this unit it is a on/off switch.these fail often
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