Vehicle make/model = CHEVY SILVERADO Z71
Year = 1999
Mileage = 160000
Engine size = 5.3
dash lights = NO
work done prior = HARD TO START, CHANED FUEL FILTER, PUMP, SPARK PLUGS
AND AM NEEDING TO KNOW WHER ETHE CRANK SHAFT SENSOR IS LOCATED
tech = ANY
question = WHERE IS THE CRANKSHAFT SENSOR LOCATED?
MW:
Hello and welcome. The Crankshaft position sensor on that engine is on the side of the block
behind the starter. The starter will have to be removed to get to it. After replacement, a 'crank
position variance re-learn' procedure will have to be done to calibrate the system. not sure if a
high end aftermarket scanner can do this or not. The dealer scanner does.
There are a couple of common things on these trucks that cause a hard start/long crank time.
Let me know what happens after the crank sensor replacement if you would like more help.
VISITOR:
it cranks too long and doesn't start but can turn off and on again and can start fine.
MW:
OK, thanks. A few things to look at in the fuel system.
Most common is a leaking fuel pressure regulator. They leak raw fuel or vapor into the vacuum
line, and cause a rich condition and cause a hard start/extended crank. Cycling the key, or
revving it up to clear it out usually gets it to start and run fine. The fuel pressure regulator is on
the dr. side of the fuel rail under the engine cover. It is about in the middle, with 1 vacuum line to
it. Also there is an older Service Bulletin regarding the fuel filler tube deteriorating inside and
causing small particles to enter the fuel and make the injectors stick. That usually will give p0300
missfire codes. Check those things and let me know.
Year = 1999
Mileage = 160000
Engine size = 5.3
dash lights = NO
work done prior = HARD TO START, CHANED FUEL FILTER, PUMP, SPARK PLUGS
AND AM NEEDING TO KNOW WHER ETHE CRANK SHAFT SENSOR IS LOCATED
tech = ANY
question = WHERE IS THE CRANKSHAFT SENSOR LOCATED?
MW:
Hello and welcome. The Crankshaft position sensor on that engine is on the side of the block
behind the starter. The starter will have to be removed to get to it. After replacement, a 'crank
position variance re-learn' procedure will have to be done to calibrate the system. not sure if a
high end aftermarket scanner can do this or not. The dealer scanner does.
There are a couple of common things on these trucks that cause a hard start/long crank time.
Let me know what happens after the crank sensor replacement if you would like more help.
VISITOR:
it cranks too long and doesn't start but can turn off and on again and can start fine.
MW:
OK, thanks. A few things to look at in the fuel system.
Most common is a leaking fuel pressure regulator. They leak raw fuel or vapor into the vacuum
line, and cause a rich condition and cause a hard start/extended crank. Cycling the key, or
revving it up to clear it out usually gets it to start and run fine. The fuel pressure regulator is on
the dr. side of the fuel rail under the engine cover. It is about in the middle, with 1 vacuum line to
it. Also there is an older Service Bulletin regarding the fuel filler tube deteriorating inside and
causing small particles to enter the fuel and make the injectors stick. That usually will give p0300
missfire codes. Check those things and let me know.
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