Thread: crank position sensor

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Hi Gang,
Helping a friend figure out his 1994 GMC 5.7L TBI -spins but no start - no fuel or spark.
When did the General start using a crank position sensor?
thanks
hank

Gm started in the 90s. front timming cover lower bottom. front timming cover is plasic one time only deal to

thanx Pat
Time to start googling
didn't quite understand "front timming cover is plasic one time only deal to "
hank

Originally Posted by TOW'D

thanx Pat
Time to start googling
didn't quite understand "front timming cover is plasic one time only deal to "
hank

the front timming cover is plastic that has a spot for the pick up . the cover are a one time only deal .that is if you have a seal leak or cover leak or look at it the wrong way you have to buy a new cover comes with front crank seal/ o ring gasket /with cover bolts. all as one kit ready to go on just to let you know

On that 1994, crank sensor and all is in the dist.The distributor controls spark and fuel until temp sensor tells the puter to take over.So no spark/fuel it has to be in distributor,(dist.not spinning, pickup,module or no power to dist.)

but there is a crank tigger on the crank .dist is fixed plastic body can not be moved . so timming is done threw crank????? ok looks like i was wrong i get them mixed up must be 95 or 96 up to 99 with the plastic front cover 5.7s ??? i think they started it sooner on the 4.3 .do not do many rebuild s on them only about two a year. i know you have to buy a new cover for them . customers do not like the price of front cover and gaskets set

I think I have only seen one of them here-----but I would be checking electrical issues first----how did you check for spark???how did you chech for fuel??????/

when you are missing 2 out of the three things needed to run, I question the methods---------

On the 4.3's the oil pressure switch acts as a low oil pressure switch shutdown where you would not have fuel or spark.If the switch is defective then......

No crank sensor that we can see

dist spins we checked for spark with #1 cyl wire to ground with leatherman in place of plug
no fuel spraying or dripping

We did a compression test and came up with 175psi all around
plugs white and lots of build up
cap and rotor corroded looks like they been there a long time
pulled the distributor and see the module pretty rusty

damn hard figuring the workings of that system without a book
thanks guys
the story continues

Soooooooooo--please explain how to check for spark with a leatherman---did you have him hold onto the wire?????????/

..........................coil wire ?

Probably similar to the 'tongue test'

Originally Posted by TOW'D

We did a compression test and came up with 175psi all around
plugs white and lots of build up
cap and rotor corroded looks like they been there a long time
pulled the distributor and see the module pretty rusty

damn hard figuring the workings of that system without a book
thanks guys
the story continues

So you didn't go to Ebay and order a factory service manual for what is usual 20 bucks??.

"So you didn't go to Ebay and order a factory service manual for what is usual 20 bucks??."
that was the first thing I suggested to my pal