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87 TBI fuel pump insanity

April 17, 2024, 08:22:00 PM by Wrought Ire
Views: 49 | Comments: 3

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

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New distributor, now starts hard. 89 7.4 TBI

April 16, 2024, 12:03:06 AM by 8d9SquareCrew
Views: 98 | Comments: 4

I recently had a local shop do a tune-up. They replaced the distributor while they were there. Now it will crank and crank and only starts the moment key is turned to run position. It's like no spark while cranking. It seems I should be able to unplug the connector at the distributor and test for cranking voltage, and run voltage. But I don't know which plugs are supposed to have 12 volts. It always started very quickly before this. Thanks in advance for any light anyone can shed on this.

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Need advice for 86 1/2 ton K10

April 12, 2024, 05:20:21 AM by louder50 | Views: 133 | Comments: 4

I bought an 86 1/2 ton K10 with no drivetrain other than the front and rear 3.43 axles. It came originally with a v6 and 4 speed manual trans. I have a rebuilt 350 to install but I don't know what to do about a trans and transfer case. I'd like to be able to drive it on the freeway and am thinking a 700r4 would be good. I'm not off roading it just a year round driver in Michigan. If I put a 4 speed manual back in it I don't think it would be good on the freeway but am I wrong? What would I need for 700r4 swap?

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1987 R10 Silverado L03 305 TBI with a 42 code

April 11, 2024, 09:39:48 PM by mcgarijs
Views: 137 | Comments: 3

Engine stumbles randomly at highway speeds and at Idle. A code 42 is stored. When the codes are clear the engine runs smooth. But will randomly every 5 to 10 min stumble. if at idle it may actually die and has to be restarted. I don't have an oscilloscope to check square waves as I read in a troubleshooting guide. The previous owner may have been chasing the same problem. I have receipts from the dealer Capital Chevrolet in Austin Tx. they took it to and replaced both fuel tank pumps, selector valve, tank selector switch both TBI injectors,distributor,ignition coil, TStat, Alternator, IAC valve. Will start and run just fine but will randomly stumble has me puzzled.

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Site Cert

April 11, 2024, 07:04:06 AM by alfreema | Views: 101 | Comments: 2

Any particular reason the forum doesn't have a free letsenrcypt SSL cert? Browsers are very picky these days about having a cert, and I would think in this day and age not having a cert would kill the ability for people to register or access this site? I also think you get dinged tremendously in SEO for not having a cert.

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