2000 Chevy S-10 running like a junker

2000 CHEVROLET S-10
120,560 MILES • 6 CYL • 2WD • AUTOMATIC
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GBOD
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I have my 2000 S10 know for 9 months I have had the tune up done distributor cap replaced computer swapped map sensor mass sensor plugs wires compression check fuel injection swapped and its all fine. Now in a shop they are saying it might be a fuel rail but I don't have a rail what I got looks like a spider it starts up good but I hit the gas it bogs down and cylinder 4 is missing would the crank sensor have something to do with it or anything else I am lost or could it jump time. I been stuck for a month without my truck.
Oct 27, 2010 at 11:57 AM
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WRENCHTECH
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What is the fuel pressure? This is very important on that engine.
Oct 27, 2010 at 12:25 PM
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GBOD
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Fuel pressure is at 65 and goes down to 45 pressure is good replaced pressure sensor to
Oct 27, 2010 at 12:44 PM
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WRENCHTECH
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What do you mean "goes down to 45"? When?
Oct 27, 2010 at 12:47 PM
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GBOD
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65 to start and 45 once its running I doubled check at the time with the haynes Manuel
Oct 27, 2010 at 12:55 PM
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WRENCHTECH
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That's your problem. These engines require a MINIMUM of 55 PSI at all times or you will have problems.
They usually won't even run at 45.
Oct 27, 2010 at 12:57 PM
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GBOD
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I have had it dianogised by two diffrent shops and both says the pressure is fine I could be wrong on the whole amount of pressure but will check thanks could there be something else some said if I have a crack in the crank sensor it could be the issue and if it is the pressure is that the pump or what would I replace
Oct 27, 2010 at 1:05 PM
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RASMATAZ
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Hi gbod, Welcome to 2carpros and TY for the donation

Check the fuel pressure and get back with the readings we start here
Oct 27, 2010 at 1:10 PM
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WRENCHTECH
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Believe me, a Vortec will not run right at 45 PSI.
Oct 27, 2010 at 1:24 PM
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GBOD
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Ok thanks I will let you know ASAP thanks agine
Oct 27, 2010 at 1:28 PM
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RASMATAZ
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I'll 2nd that-also at 52-BTDT
Oct 27, 2010 at 1:38 PM
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GBOD
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Starts up at 61 and stays at 55 fuel pressure
Oct 27, 2010 at 3:03 PM
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RASMATAZ
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fuel injection swaped-You need to open it up and physically check the fuel pressure regulator and the nut kit

Is this 55psi while its running? If so shutdown and monitor the pressure how long it takes to go zero
Oct 27, 2010 at 5:30 PM
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GBOD
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Cylinder 4 is miss fireing but got gas and good spark the hand held comp is saying p0300
Oct 29, 2010 at 11:32 AM
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RASMATAZ
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Random misfires-normally caused by vacuum leaks and bad fuel-checkthe no.4 plug/compression and injector
Oct 29, 2010 at 11:38 AM
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GBOD
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Done everything and number 4 has a miss still pressure is good spark is good change fuel injection no change
Nov 1, 2010 at 2:08 PM
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WRENCHTECH
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You should have an injector balance test done to it. Those injectors do go bad and they can be changed individually.
Nov 1, 2010 at 3:32 PM
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GBOD
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It's a bran new injection its one piece to its the v6 4.3
Nov 1, 2010 at 3:43 PM
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GBOD
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It's the vortec motor I have replace fuel injection I have tested the harness on it I have done all senors be sides nock senor I have took the valve cover off I have check compression and fuel pressure I have done most of everything could the knock senor make just one plug miss or what ?
Nov 1, 2010 at 3:49 PM
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WRENCHTECH
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It's not one piece. It has replaceable fuel injector solenoids. This is a sequential injection system.
Nov 1, 2010 at 3:50 PM
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GBOD
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That's not the point I swaped the whole unit and I have fuel
Nov 1, 2010 at 3:55 PM
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