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SN-95 and New Edge Mustangs
Engine Surge at Low RPM
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<blockquote data-quote="zinda" data-source="post: 15938399" data-attributes="member: 191933"><p>Im not sure what you are asking here, when you clear the codes and the check engine light comes on right away, its telling you that theres a problem that has not been fuxed since the code was posted originally. If its a vacuum leak it could interfere with almost every test that the car tries to do. Once the O2 sensors try to adjust the output unsucessfully, it throws a cide. The sensors see too much gas and the comp trues tr lean it and it still senses too much gas, the computer thinks the O2 sensirs are bad. It diesnt jniw that theres a vscuum leak thats thriwing off the air idle mixture. It just knows that it cannit compensate for the high or low readings and quits testing at that point. The O2 sensors are constantly beingbmonitoredvat all times, they are the 5 gas analysers that are built into the car. They test the output for unburnt gas or too much carbon or any other residual left over gases as tgry leave the cumbustion chamber. Theres some cokd starting modes tgat are in place to act as a "Choke" thus tupplies extra gas to the cylinders while the car warms up. Gas will become more volitle when its hot, too hot and it burns up before its detonated. This uscwhere higher octsne gas plays its role in higher prrformsnce cars especually high compression engines. </p><p></p><p>The gas will compress and just that comoression alone will cause "predetonation* thats the pinging noise. Thats the cylinders firing off the top dead center mark, this can be just a split second befire the computer wsnts the plug to fire the gas and it msy be abke to comoensate by adjusting timing and opening injectors more to kerp gas from evaporating since the gas will cool the cykinders chamber, more gas will cool it more.</p><p></p><p>Thus is how deisel engines work and thats why the term deiseling is given to cars that keep running after the key is turned off. The heat and compression are enough to fire it untill the cylinders run out of available gas in the lines. Without your electronic fuel pump running it only has pressure thats in line to do this, carborated engines with mechanical pumps can deisle for a long time, ive seen them go for a few minutes. If the key us turned back on the car will resume running or sometimes blow the exhaust apart from all the accumulated unburnt gas that is produced from the deiiseling, it no longer has the spark to burn off the residue and its pumoed out into the exhaust, builds up, then the spark fures a flame ingo the exhaust pipes and the mufflers explode, mostly on single exhaust cars.</p></blockquote><p></p>
[QUOTE="zinda, post: 15938399, member: 191933"] Im not sure what you are asking here, when you clear the codes and the check engine light comes on right away, its telling you that theres a problem that has not been fuxed since the code was posted originally. If its a vacuum leak it could interfere with almost every test that the car tries to do. Once the O2 sensors try to adjust the output unsucessfully, it throws a cide. The sensors see too much gas and the comp trues tr lean it and it still senses too much gas, the computer thinks the O2 sensirs are bad. It diesnt jniw that theres a vscuum leak thats thriwing off the air idle mixture. It just knows that it cannit compensate for the high or low readings and quits testing at that point. The O2 sensors are constantly beingbmonitoredvat all times, they are the 5 gas analysers that are built into the car. They test the output for unburnt gas or too much carbon or any other residual left over gases as tgry leave the cumbustion chamber. Theres some cokd starting modes tgat are in place to act as a "Choke" thus tupplies extra gas to the cylinders while the car warms up. Gas will become more volitle when its hot, too hot and it burns up before its detonated. This uscwhere higher octsne gas plays its role in higher prrformsnce cars especually high compression engines. The gas will compress and just that comoression alone will cause "predetonation* thats the pinging noise. Thats the cylinders firing off the top dead center mark, this can be just a split second befire the computer wsnts the plug to fire the gas and it msy be abke to comoensate by adjusting timing and opening injectors more to kerp gas from evaporating since the gas will cool the cykinders chamber, more gas will cool it more. Thus is how deisel engines work and thats why the term deiseling is given to cars that keep running after the key is turned off. The heat and compression are enough to fire it untill the cylinders run out of available gas in the lines. Without your electronic fuel pump running it only has pressure thats in line to do this, carborated engines with mechanical pumps can deisle for a long time, ive seen them go for a few minutes. If the key us turned back on the car will resume running or sometimes blow the exhaust apart from all the accumulated unburnt gas that is produced from the deiiseling, it no longer has the spark to burn off the residue and its pumoed out into the exhaust, builds up, then the spark fures a flame ingo the exhaust pipes and the mufflers explode, mostly on single exhaust cars. [/QUOTE]
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