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Re: change lightbulb for check engine light
DOES THE SYSTEM GO THROUGH QUICK TEST? I ASK BECAUSE IT IS VERY UNLIKELY THE CEL IS BURNED OUT, NEVER SAW IT EVEN OCE IN 20 YEARS OF DOING SMOGS AND FIXING ITEMS LIKE THE CEL INOP, WAS ALWAYS ANOTHER REASON. THE CHECK ENGINE LIGTH (CEL) IS IN THE INSTRUMENT CLUSTER, IT MUST BE REMOVED TO GET ACCESS TO THE BULB TO EITHER REPLACE IT OR FIGURE OUT WHY IT DOESN'T WORK.
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The smog check requires a visual inspection of your check engine light. It has to come on for a bulb check at startup to make sure it's working. But, the light must go out after starting the engine(it cannot stay on after the engine starts during a smog check). If the check engine light fails either of these two tests, the vehicle will fail the smog check inspection. You need to have the cause of your inoperative check engine light diagnosed and repaired.
NOX is created when the internal combustion temperature gets to high.The egr system uses burnt exhaust gases to line to cylinder walls.The purpose of this is decrease internal combustion temperature therefore reducing the amount of NOX created.Would look to a possible egr malfunction usually they will trigger the check engine light but not always.The 4.3L has been known to have issues with carbon buil up in the egr and the egr pintle not open and closing properly.
Your modulator valve on the outside rear of the tranny may be leaking tranny fluid into the vacuum line and it it is being burnt and exhausted by the engine. The valve has a thin diaphram within and over a period of time it can leak the fluid into the line. This must be replaced before it becomes a situation where the tranny will not shift out of low gear. Thank you, Dana