Will not accelerate
David, there can be numerous areas to fault find a issue like the one you have. But first lets look how this works. How does a engine accelerate? Now first we start to check your accelerator cable starting from the pedal to the last end at the intake manifold. Assuming this works we will continue from there to find out if the butterfly in the intake is functioning properly. Assuming this works and the gap setting is fine, we now move on to more serious parts. Fuel injection engines have a air-fuel mixture sensor which can be adjusted situated at the intake butterfly. This may lead if not set properly or defective, to accell of the revs. When found faulty, remove and replace. Assuming this works we now move on to make sure the air cleaner filter is clean and not clogged. Assuming this is fine we now move on and find out the fuel injectors if they are functioning properly. Now at this point the only method is to remove the injector tray or one by one and you will need to send it to the local LD agent or auto electrician to test. Assuming this works, we head for the fuel line system. How ever, the following explanation is on assumption that the engine has gone through the servicing schedule. But I have found that when I replaced the fuel filter according to schedule, that I needed to drop the fuel tank. I can assure you I yet have to find a fuel tank without muck inside. It can be a tedious job but I do drop my fuel tank every 50 000 km\'s because the time spent dropping the tank and cleaning the inner, really don\'t take that long and money can be saved instead of purchasing fuel filters often. Assuming this is fine, back at the engine. Here it starts getting more complicated. On the intake manifold, there are some hoses that work for other parts of the engine as well as the suction needed at the servo valve of the brakes. Now you need to make sure that all hoses from the intake manifold, is seated properly. Here we don\'t want any loss of air-suction. Here\'s how this works, air gets sucked in from the accelerator butterfly intake only. NO WHERE ELSE. A sudden high rev on a stand alone engine is because there is air leakage from there to the engine top. This to a certain degree may cause numerous activities. In short there should be zero air-suction leakage from the start of the intake to the piston. Assuming all the above is checked and is fine, we now move to combustion chamber compression. Here you will need to take the vehicle to a mechanic who deals on testing the compression inside the sleeve. What they do here is remove a spark plug and install a fitting and turn the engine to get data on that combustion chamber. Here one will be surprised what the eye nor ear can do. Here is a whole book to right on concerning compression data. Its a variety of faults to be checked. From piston worn rings, cracked cylinder head, valves etc. Assuming the compression test is good, we don\'t have many more options left from here. One may look at wrong fuel through to efficient amount of fuel required at the piston, to all of above. Bear in mind that overheated engines may cause some concern sometimes. Cracked cylinder heads may lead to issues like acceleration problems. Wrong timing can be a issue if set to retarded top dead center. Worn piston rings or sleeves may lead to this issue. Bottom line is there is a alphabet of concern to look into, that\'s why its very important to service on the scheduled requirements as set from a on the book manual. Most of this is DIY but some need special tool number. After all the computer may start to be faulty and should be checked by LD or any agent with a reader.I do hope this gives you a guide line to look into, and that you are satisfied. Regards
