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  1. L

    not starting

    No , I was going to set the base timing when I unplugged wire, then it wouldnt start after that so I could do it, then I plugged wire back up and it still didnt want to start. So I never got to do it. Would something like a missing ground cause the code 34 to pop up? I have built several...
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    not starting

    I forgot to add, this truck ran ok before rebuild, just had buncha leaks and 30 years of gunk on it. So my thought is ecm and distributor are probably ok
  3. L

    not starting

    All the sensors were replaced , but I have been getting a code 34, which has to do with map sensor, I put old one back on and still get same thing. Like I said , it will start and idle all day in park( at least before this) , but it doesnt want to run underr load. I mentioned the wire...
  4. L

    not starting

    Hey guys, 87 GMC Sierra 305 tbi . Rebuilt engine, Ive had it running for a while , but when I put it in gear it would die or barely move. I had yet to set timing so decided to try to set it. Found the brown /black stripe wire and unplugged it. That's when the trouble started . I haven't...
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    New build wont stay running

    To update a little, i retarded timing a little and got it to start by putting a little fresh gas in tb. It ran fairly well and sat at idle til I shut it off instead of stalling out. The gas is squirting from injectors properly. It still will not start without putting fresh gas in tb...
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    New build wont stay running

    Oh, one other thing, sounds like I have a vacuum leak somewhere but cant keeps it running long enuff to find it, would that cause it to die out?
  7. L

    New build wont stay running

    Yea, pretty sure its right, it fires right up when you pit starter fluid or even a little fresh gas in intake. I was wondering about the TPS, I replaced it but just wondering if I got the arm on wrong side
  8. L

    New build wont stay running

    Hi, just rebuilt the 305 in my 87 Gmc Sierra. Turns over but won't fire til I spray starter fluid in, then dies after few seconds. Now I know fuel pump is working , watched it squirt fuel, but the thing I am not sure about is how old the gas is in the tank, could be 1-2 years. (long story). I...
  9. L

    Ground wires ?

    Ok great. I was already pretty sure they were ground but wanted to doible check. The eyelet has that kinda star pattern on it like a ground terminal has, plus theres nothing else back there to power . Thanks
  10. L

    Y pipe

    Anybody successfully found a replacement for stock y pipe? I bought one made by Walker and flanges are not wide enough to reach studs on manifold, plus flare on pipe barely does cover manifold donut gasket.
  11. L

    Ground wires ?

    One is black with white stripe, other is brown , kind of a darker brown than a tan
  12. L

    Ground wires ?

    Hi everyone, I am putting wiring back on motor after rebuild, I labeled most everything but did find what looks like two wire tied together that have a ground eyelet terminal but I am not sure if thats what they are. They are off of the group of wites that go to starter but more at top of motor...
  13. L

    Stock exhaust configuration

    Theres not anything like that on mine, may have been removed before I got it
  14. L

    Stock exhaust configuration

    I'm fine with keeping exhaust manifolds and even a single pipe, if taking converter off wouldnt cause it to run bad I am fine with that too. Its just for around town driving , no extra horsepower needed really, but what do you mean about the AIR pump? I am trying to learn all this stuff, thanks...
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    Stock exhaust configuration

    Thanks for replies, yea I looked and looked last nite and finally figured out this is what was a pellet style converter, doesn't really look like the newer ones. We dont have to deal with any emissions testing here at all, could I just leave it off and run a straight pipe or would that give me a...
  16. L

    Stock exhaust configuration

    Hi everyone, Im trying to figure out the original exhaust on an 87 GMC Sierra Classic. Ok , part of it is completely missing so I am trying to search and piece together what the thing looks like and what parts were originally there, I am buying all new cause the old one was totally shot. So far...
  17. L

    What is it

    Yes! Thats it, thanks !
  18. L

    What is it

    Hi, I have what is probably a rookie question and cant get phone to post a picture but here goes. Have an 87 gmc sierra with 305 , what I want to know is what is the part that looks like a large vacuum advance and hooks to throttle body armature where the linkage hooks up? It actually pushes in...
  19. L

    17" tire sizes

    Hi, I want to go with 17" wheels on stock 87 GMC Sierra , but not sure what size tire to go with. Truck is stock height , so what do you think would look good for street look as far as being big enough to fill wheel well but not look oversized, pictures would be great. Thanks
  20. L

    Stock exhaust

    Thanks George, thats kinda what I was guessing, just didnt know for sure and cant find exact reproduction. Ive got the y pipe from manifolds, intermediate pipe and tail pipes, just cant find the y pipe you are talking about . Maybe I can find a universal one . Thanks again
  21. L

    Stock exhaust

    Hi, kinda new here. I am restoring the 87 gmc sierra classic my dad drove around for 20 something years . I have a question about the exhaust, I have found several of the stock pipes made by Walker, but my problem is this, on this truck there was a section rusted out behind the intermediate pipe...
  22. L

    What are they

    Hi, first post here, i am trying to figure out what the two little rectangle things are on firewall of my 87 gmc sierra , there are two right next to each other, just off from center of firewall on passengers side, they hav group of wires coming out of the bottom, i know this may be dumb...
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