Question about 1990 Chevrolet K1500

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Hey all hope you can help me diagnosis my problem here...I have a 90 Chevy 350 that wont start...it started out loosing all power had to floor it to go 1mph..then just died all together....I checked all sensors with volt meter or ohmed it where needed..found my pick up coil to be bad changed it..everything else tested good or replaced if it was iffy....I'm getting spark and fuel..it seems to be running while I'm turning key but as soon as I let off key it wont continue to run more that a second or 2..just changed oil pressure switch.. new cap n rotor. Plugs n wires. Ignition module..still nothing..any help would be greatly appreciated thanks joe

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  • joejj85 May 28, 2011

    I feel as though we have checked about everything..gone through the book many times over trying to get it to run..forgot to say we did a new timing chain and gears. By the book..even took it back apart thinking we may have not had it are TDC.

  • joejj85 May 28, 2011

    Can't find much info on proper way to test it. Any idea and ill go try it now..

  • joejj85 May 28, 2011

    I've checked all the obvious like u mentioned..has all new plugs and wires new timing set. Various new sensors that tested ok but iffy..I will do the test on fuel flow. But pretty sure I can rule that one out..new fuel pump and filter a year ago..new filter the other day..

  • joejj85 May 28, 2011

    I really can't figure this one out..I feel that between me and my dad that we are fairly good mechanics..we have rebuilt or worked on many vehicles. Over the years but this one is just making no sense...its a Chevy v8 they can run on 3 cylinders..it is so close to running its not even funny been working on and off for 3 months with absolutely no luck

  • joejj85 May 28, 2011

    K will check it in few hours...just ruled pump out as its only a year old...where is the fuel pressure regulator at..easy change. Could it be causing problem?...either way ill be testing fuel flow

  • joejj85 May 28, 2011

    Even tho I'm getting power to coil with key in on position. What's the difference with key in the start position..should be the same as having key on...just don't know how that says ignition switch is bad...others say low fuel pressure.

  • joejj85 May 29, 2011

    Hey guys just got done checking fuel flow..I got about a quart of fuel in about 5 second of cranking motor over.much more than the half pint in 15 sec I was told it should be...funny thing is it started and actually ran for a 2 to 3 seconds with fuel line off..so this leads me to think my fuel pressure regulator is faulty and just flooding out engine...I looked inside TB while cranking over and its pulsing fuel into TB but does look a little excessive not sure tho. Any thoughts?

  • joejj85 May 29, 2011

    Help!!!!!!

  • joejj85 May 29, 2011

    A lil help would be helpful

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When you say you turn the key and it runs, does it have necessary power at time of turning key and what position is key in when it is running and did you check fuel pressure with a gauge.

Posted on May 28, 2011

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  • joejj85 May 28, 2011

    It doesn't exactly run but might as well be running while cranking it over. Not sure where you are asking to check power.

  • youngauto May 28, 2011

    You need to make sure you have checked all the basics like spark at spark plugs, non-fouled spark plugs, verify no mechanical problems like broken timing chain or broken camshaft. Also check fuel flow volume by disconnecting fuel inlet line and putting line in a container, crank engine for 15 seconds and you should have half a pint of gas in container after 15 seconds of cranking engine.

  • youngauto May 28, 2011

    If the to dots on the crank gear and cam gear were aligned then it is right on your cam timing, but this is not top dead center for no. 1 cylinder it is 180 degrees out. You need to make sure your distributor is timed on no.1 at top dead center. The easiest way is to turn the engine over by hand while you are testing for compression at no. 1 spark plug hole. When compression is felt by using the hose part of a compression gauge and your finger on the gauge end, verify the piston stops at top dead center at this time, I usually use a scewdriver for this in the spark plug hole so when the screwdriver is at its highest point that is top dead center for that cylinder, this will be no.1 cylinder top dead center. Now you have to remove the distributor cap and make sure the rotor is pointing to no. 1 terminal on the distributor cap, If your timing is right and you have spark with clean plugs and your fuel flow and pressure is okay you should be able to start the truck. Have you checked engine compression?

  • joejj85 May 28, 2011

    We did verify tdc when we put new timing set in..after we got it put together again still nothing..we turned dist. 180 thinking that was problem. It then backfired n shot flames out throttle body. That told us its 180 out now since its flaming out TB. So we set it back where it tries the best. Even tore back apart to verify...has 120 psi average for compression..guess it all leads to fuel pump with low pressure...

  • youngauto May 28, 2011

    Yes to have to check fuel pressure on these trucks especially since you have trouble with the fuel pressure regulators after the trucks have miles and age.

  • youngauto May 30, 2011

    The fuel pressure regulator unbolts from the top of the throttle-body. I have seen problems with the coolant temp sensor and or the knock sensor cause havoc with these trucks. Do you have access to a computer scanner to read live data? Very difficult to diagnose these trucks without reading fuel pressure with the fuel lines hooked up.

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Check fuel pressure if so computer output for the fuel pump might be inop

Posted on May 28, 2011

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  • joejj85 May 28, 2011

    I do not have a pressure gauge available to test that...my injectors are spraying fuel Tho. I picked up a new ecm from junk yard. Didn't change anything.. can smell lots of gas while cranking. Tried a shot of gas down tbi didn't try any better. Same goes for shot of starting fluid

  • tim fredrickson May 28, 2011

    ok possible ignition switch do you have a way to check this

  • joejj85 May 28, 2011

    I am getting power to coil with key in on position if that's how to check ignition switch

  • tim fredrickson May 28, 2011

    then id say it was the ignition switch cause it runs in the start position

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