Question about 1996 Chevrolet K1500

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Replacing central port injector on a 1998 Silverado

I have a 1998 Silverado an the central port injector needs to be replaced. Are there do-it-yourself instructions available to do this?

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  • Nomadd May 11, 2010

    What makes you think it needs to be replaced?

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This is a fairly simple job with a good repair manual. There are 6 or 8 injectors depending on the engine.

Posted on May 08, 2009

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Hyundai accent1.5rsi misfiring


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Chevy truck year 1998 silverado 1500 350 engine what sensor is it that lets the gas get to the carborator i change the ignition mar under the distbor cap put a new gas filter check the fuses. i check my...


i'm pretty sure you have a Central Port Injection setup on this engine. Which means the injectors are inside of the upper plenum and cannot be seen. This type of fuel injection system uses a centrally located electric fuel injector(s) which feed fuel to a mechanical poppet style injector which is routed directly above the intake valves for each cylinder.

The poppet valves require a minimum of 56 psi of fuel pressure. If you have 55 psi it will not start. It needs the fuel pressure to overcome the mechanical resistance of the poppet injectors. Fuel pressure should at least be 60 psi. It is very important to check fuel pressure with an accurate gauge.

If fuel pressure is low it will not start no matter what you do and a new fuel pump will likley fix the problem. Get a good quality pump such as an a/c deco or Dephi. Other brands may be cheaper but they will not last.

If fuel pressure checks out good let me know and I'll give you some more info.

Jun 29, 2011 | 1999 Chevrolet Silverado 1500

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Our truck willn not start


Maybe your fuel pressure regulator valve!

Jan 16, 2010 | 1999 Chevrolet Silverado 1500

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Toyota Camry 1998 - There was a leak on one of the fuel injector...what is the problem..is it the o-ring fitted on the injector?


Most times it is the injector o ring seals -- If replacing the o rings does not cure the problem - you may have to replace the injector

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Not recieving gas to crank.


You jimmy has no throttle body, the injectors are in the intake manifold in front of the intake ports. To have them activate, you need 62 to 65 PSI at the shredder valve. Anything different will not activate the injectors and DO NOT TRY TO START THE ENGINE BY PORING GAS THROUGH THE THROTTLE BODY. It's been know for the gas to catch fire and burn up the poppet valves, (fuel injectors) which will result in a $1,500 Spider injector replacement. If you do not have the proper fuel pressure, chances are the fuel pump will need to be replaced. When replacing the fuel pump, replace the wire harness from the fuel pump to the frame, it's only $12.00 and will keep the gremlins away. Good luck and keep me posted, the other thing too that would cause the injectors not to fire is a bad ignition modulator with is located under the rotor in the distributor. Keep me posted, be glad to help you get your jimmy running again soon.

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I have a 98 chevy silverado 1/2 ton 5.7L motor. My truck will only start after I turn the key over and over to allow the fuel pump to run. I sometimes do it 10 times before it actually starts. After its on...


The problem may be that it has 55 psi instead of 60-65. Could be the fuel pressure regulator or the fuel pump itself. I have read that these engines need 60 psi minimum to start reliably. Also with the engine off, look down the throttle body with a flashlight and see if the intake appears wet inside, indicating leaking central injectors. There is an upgraded injector assembly available with pressure regulator at autoparts stores. Requires 4-5 hours to replace with experienced mechanical skill level. Would definately upgrade if the pressure regulator needs replaced anyway.

Mar 11, 2009 | 1998 Chevrolet K1500

1 Answer

1998 silverado misfire


Check for a vaccum leak at the intake. Frankster016

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