[rlauger]

1995 Astro, 4.3 W engine. still having no start issues. at this point I have spark but no start. I know there is fuel because: new fuel pump, filter, spider and still have greater than 60 pounds at the rail. new distributer and pickup with nice white spark out of the distributer, although that has been intermittent in the past. at this time there are no codes. computer is new also.
Any suggestions? Sounds like has to be a wiring problem but I have done continunity checks on the harness without finding any open wires.

Thanks
Ross

 

[davesyo]

If your sure do have spark and fuel then try a compression check , check for stuck open EGR or faulty crank pos. sensor

 

[rlauger]

davesyo,
Thanks for the advise, compressions are good, I'll check the crank sensor. It that was inop, woulnd't I have a crank sensor code? I've read lots of other posts with intermittent start Astro's. wonder how many of these problems are wiring harness related?

Thanks for the input. I'll let you know what I find with the crank sensor.
Ross

 

[gtkane]

No-starts will rarely set codes because one of the conditions for the pcm to test a component is that the engine be running for 10 seconds.

 

[rlauger]

OK thanks for the advise.
Ross

 

[rlauger]

davesyo,
I looked in my alldata reference and can't find crank shaft postition sensor. does my 95 have one? Went to NAPA's website to find a replacement part- to see if that would send me in the right direction, but no luck there either.
Thanks
Ross

 

[gtkane]

If your engine is a Vortec motor, the crank sensor is located at the bottom of the timing chain cover. It is held on with one bolt.

 

[rlauger]

It is a Vortec, I'll go look under tomorrow. thanks for the tip, but if the crank sensor was bad and I still have gas and spark wouldn't there at least be an occasional back fire?
thanks again,
Ross

 

[Clamster]

rlauger, Try reading up on your system over at the Autozone site.
http://www.autozone.com/az/cds/en_us/09 ... oPages.htm
It has alot of basic useful info. gtkane, boy could I use a real techs help right now I am at wits end on a problem but won't steal this post.