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Old January 30th, 2011, 07:48 PM   #1
chevybtk
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Arrow 1995 chevy TBI prob....

I have a 95 chevy 5.7L TBI engine.....well hasent ran in a while just put motor in and stuff and everythings hooked up i have to start the truck with starting fluid but once it starts it will run ok....but soon as i turn it off, and truy to restart it just truns over and wont fire again.....its getting gas and spark...but u spray eather in it fires up and runs........just wont restart...what could be the prob....???????

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Old January 30th, 2011, 07:50 PM   #2
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bad plugs/wires
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Old January 30th, 2011, 07:53 PM   #3
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I'd check the IAC to be sure it isn't crudded up, and I would check your fuel pressure.

The TBI base gasket can be a source of trouble too so I would replace it as well.

I have a '95 Z71 TBI and had to do the base gasket, but it was because it would idle at 1,200 rpm due to it sucking air and running lean.

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Old January 30th, 2011, 07:54 PM   #4
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X2 on plugs and wires but I think I would put a fuel pressure gage on it just to know for sure
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Old January 30th, 2011, 07:55 PM   #5
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idk im lost it has runs good after i get it fired up....no missing or anything......
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Old January 30th, 2011, 07:55 PM   #6
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where would i hook a FPG at on the tbi and what should pressure be at?
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Old January 30th, 2011, 07:59 PM   #7
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The average fuel pressure for this systems is between 12 psi, and no more than 15 psi.

If once you test the fuel pressure as we are going to show you below, your reading is below 12 psi, the way to know if the problem is in the fuel pump or the fuel pressure regulator is to block the return line, by pinching the rubber hose in the return line with needle nose locking pliers, by doing this you will stop gasoline from flowing back to the fuel tank, this should cause the fuel pressure to increase a minimum of 10 psi, if the pressure doesn't increase, the problem is in the fuel pump and needs to be replaced.

If once you block the return line the pressure increases 10 psi or more the low fuel pressure is likely to be caused by a defective fuel pressure regulator.

To check fuel line pressure, they have an adaptor that goes in place of the fuel filter (you did change that, right?) and the gauge hooks to that to read pressure. 14psi is ideal.
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Old January 30th, 2011, 08:04 PM   #8
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yes changed fuel filter but once it started it ran for 25 minutes no prob until i turned it off an tryed to restart it......and just cranked over...
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Old January 30th, 2011, 08:05 PM   #9
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can you see the injectors spraying fuel when you crank it?
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Old January 30th, 2011, 08:07 PM   #10
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yes they spray fuel.....
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Old January 31st, 2011, 05:40 AM   #11
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anyother options?
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Old January 31st, 2011, 05:59 AM   #12
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Start checking the signal from the oil pressure sending unit. There is a fuel pump lead associated with it that can fail and not allow fuel while cranking. The sending unit in question would be the one next to the distributor. It runs to the relays near the master cyl on the firewall. By using the starter fluid, your "fooling" the computer and it starts, getting it past the cranking mode.

Some good info on this in this link: http://www.chevytalk.org/fusionbb/sh...hp?tid/240853/

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Old January 31st, 2011, 06:14 AM   #13
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How's the cap and rotor? Weak spark would be my next guess if its spraying fuel when cranking.
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Old January 31st, 2011, 08:30 PM   #14
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so looks like i have some work to doo.....
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Old January 31st, 2011, 10:16 PM   #15
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what plugs,cap,rotor,coil, and wires should i run to get most optimal millage and performance??
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Old February 1st, 2011, 03:59 PM   #16
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AC Delco, the only reason to get "high performace" ones is if your running a race engine.

AC delco seem to work the best, and they're cheap. Just don't get the cheapest ones lol
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Old February 1st, 2011, 05:21 PM   #17
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x2 I always run Delco.
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Old February 1st, 2011, 08:28 PM   #18
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try unplugging the tbi injector and then try starting it could be flooding and the either is drying the plugs just enough to fire this is usually caused by a stuck partially open injector just not enough to affect normal running worked on lots of these with this issue hope it helps
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Old February 2nd, 2011, 03:47 PM   #19
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thanks....
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