Recent Posts

21

Engine/Drivetrain / Re: 357 (350 - .40 Over) Build Questions Etc

« Last post by JohnnyPopper on April 17, 2024, 09:56:57 PM »

Too bad everything is so dirty and needs cleaning! Sheesh!!!

22

Fuel Systems and Drivability / 87 TBI fuel pump insanity

« Last post by Wrought Ire on April 17, 2024, 08:22:00 PM »

Howdy guys, I have the STRANGEST problem going on with my '87 305 tbi not kicking on when I need to start it. Everything on it is fines. It's a pretty clean truck but while I was gone for a couple years in MT it apparently stopped running suddenly. Replaced fuel pump, replaced, fuses, replaced relay, replaced ignition module, replaced lines and hoses. Heres where things get weird.

When I key on theres no fuel pump prime, to start it cranks but again no pump, if I drip gas from a bottle it fires right up and runds until I stop giving it gas. Whe. The truck shuts OFF the fuel pump kicks on like its suppose to to reprise the system. So it works! Better yet when. I connect the test wire from the relay to the battery I csn manually kick on the fuel pump and it sounds lovely! Problem even with the test wire hooked to force the pump to run it won't start, it won't even pump fuel out of the injectors like it's not getting told to do so or something. Idk how these TBI systems work I just know it's an absolute nightmare that doesn't make any sense.

So why would it work every time besides when key on and run, and why when it's forced to run manually would the TBI not inject fuel?

I have NEVER needed to take a vehicle to another mechanic bc i couldnt figure it out and I'm so close to taking a big risk by paying someone else to run around it so annnny help would be greatly appreciated

23

Fuel Systems and Drivability / Re: 1987 R10 Silverado L03 305 TBI with a 42 code

« Last post by Shifty on April 17, 2024, 09:41:47 AM »

I carry a spare in the glove compartment....

24

Fuel Systems and Drivability / Re: 1987 R10 Silverado L03 305 TBI with a 42 code

« Last post by mcgarijs on April 16, 2024, 09:35:40 PM »

give yourself a cold beer put it on my tab! replaced the distributor Ignition module and it cleared up the stumbling. the distributor was a new Jegs and a piece of crap it is. When pulling the wires off the top of the cap one of the brass electrodes that go into the distributor and the rotor fires to, pulled out with the wire, then looking at the rotor it was shiney around the center looks to have been getting hot. Replaced the Cap, Rotor and ignition module. The code hasn't come back after about 20 miles of test driving so I think its fixed . for now anyway.