Check dark blue/white wire from knock sensor to ecm(electronic computer module)
if it is grounded or shorted to ground then code 43(electronic spark control circuit) will be set
Warm car to normal temperature.shut off engine.disconnect knock sensor.turn ignition switch to on position or run position(engine is not running)
check voltage between harness and ground(should be between 4 to 6 volts)
yes-means bad connector or bad sensor
over 6 volts-shorted to voltage or bad ecm
under 4 volts-shorted to ground or bad ecm
a bad throttle position sensor will cause: transmission shift issues, bucking, jerking, idle surging, engine cuts off, hesitation on take off, surge while cruising down highway. all or part of these symptoms will indicate a bad sensor. not all the time will check engine light be on!! sometime these symptoms will not set a problem code.
this is normal for this engine, in fact anything short will trip a check engine light. the cause will be a low coolant condition, a thermostat stuck in the open position or a bad coolant sensor. this is normal for this engine, in fact anything short will trip a check engine light. the cause will be a low coolant condition, a thermostat stuck in the open position or a bad coolant sensor.
There is no distributor on a 99, so there are a few sensors that can cause this. If you've had your intake replaced, or it is leaking, it could be the Cam sensor, which is located on the top of the engine, under the power steering pump, there is also a crank sensor (Is your tachometer working?) and lastly there is the ignition module which is located under the coil packs on the back of the engine.
depends if it is bad it can but are u actually talking about the o2 senser or the mass air flow sensor on the intake.... cause it can be a bunch of things but the air mass flow sense is easy to replace i have to buy one and the tools to replace it and the sensor is 45 dollars for my 97 Pontiac Bonneville se v6 3.8l hopefully that fixes the probem with it not wanting to start ...i got fuel pressure it just isnt fireing
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