Hello! I've been stalking this site now for over a week since I found out my buddy was giving me his blazer Definitely impressed with all the info given by the members, so I figured I'd join! The newly acquired vehicle in question would be a 1989 s10 blazer 4x4 with the 4.3. She's a little rough around the edges, but finally getting back to work (almost a year searching) so I'll make do. Anyways, the blazer seems to only start with the help of starter fluid through the semi stuck butterfly of the throttle body. My question is, would a NEW or fully functional TB cure this problem, or am I looking at a fuel pump?? If it helps, fuel was coming out of the rusted line by the filter lol! Any help would be appreciated tho, thank you all in advance!

 

A sticking throttle body shouldn't cause a no start. Idle air is provided by the idle air control valve on the side of the throttle body. I would remove the throttle body and give it a good cleaning to free up the throttle shaft/blades as well as clean the IAC valve and its bore. See if that helps.

Your fuel pressure should be ~10psi. Too low and the injectors won't be able to properly atomize the fuel when they spray.

 

You can actually buy kits for these units kinda like a card kit. They're mot too privey. Check it pot and see if going through the TBI unit doesn't help. A good cleaning is of course part of the process.

 

ok good info thanks guys. i kinda thought it would probably be the fuel pump as well seeing it just rolled 130k and nothing but basic service has been done. which stem am i checking for accurate pressure?

 

You will have to remove the larger of the two lines from the back of the throttle body and install a 'T' fitting to then be able to read the fuel pressure. You can purchase 't' fittings with a gauge already installed and just leave it there. That is what I plan on doing when I get around to swapping the TBI 350 into my '74.

 

gotcha. i was planning to rent a fuel pressure tester at the local parts store. maybe that fitting is inside there? can i buy the fitting separate?

 

Some of the more expensive kits come with the proper adapter. Just tell the folks at the parts store that you need the GM TBI adapter and they should be able to get you the proper stuff.

 

sounds like i got my weekend planned! thank-you swartlkk!anything else i should pay some lose attention to? I was reading up a old post about intake leaks, is this a huge concern with these models?

 

The TBI base gaskets are somewhat known for leaks... You may want to throw a new gasket under it while you are messing with things. They are relatively cheap.