Question about 1998 Chevrolet Blazer

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1998 chevy blazer has good fuel pressure but no fuel in the throttle body when starting.

This is my neighbors truck i am just getting into. They replaced the throttle position sensor the cap and rotor, the EGr valve. The engine ran for a bit and then just died along the road. i tested fuel pressure at 62lbs. the pump seems to be fine but no fuel is entering the throttle body when turning it over. I am wondering if teh cam sensor could be the issue?

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  • paulezy
    paulezy Nov 05, 2012

    After much aggravation and a bunch of unneeded new parts I found the weather boot going to the coil had a bad connection. $3.85 at the local salvage yard and we were back in business.

  • paulezy
    paulezy Nov 05, 2012

    Yes thank you for your help. Taking the time to trouble shoot the basics before throwing parts at a problem will save you big time in the long run. But hey if you wanna drink beer and put new parts on with the neighbors without trouble shooting have at it.

  • teds repairs
    teds repairs Nov 05, 2012

    this is the link to my shop on facebookhttps://www.facebook.com/TedsRepairs

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  • Chevrolet Master
  • 2,101 Answers

You have a bad fuel pressure regulator. it control the the fuel pressure in the rail.

Posted on Nov 03, 2012

  • teds repairs
    teds repairs Nov 05, 2012

    what I try to do is get help to people before they buy parts. A car is not a dart board,and some of the guys here do not know much

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6ya6ya
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Posted on Jan 02, 2017

csmock132
  • 4669 Answers

SOURCE: 87 chevy truck with TBI idles too fast

Spray the intake with carb cleaner to find the vacuum leak. Check where the EGR mounts and the throttle body gasket sense you had both off.

Posted on May 10, 2009

  • 116 Answers

SOURCE: 1999 chevy blazer wont start

THE FUEL PUMP IS BAD.

if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

Posted on Apr 11, 2009

  • 4088 Answers

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

  • 1 Answer

SOURCE: 2000 chevy blazer, truck cranks

Does your battery go dead?

Posted on Dec 18, 2008

  • 335 Answers

SOURCE: I Have a 2002 blazer that starts but motor dies, surges when accelerating

If this engine is a VORTEC then you may have a problem with the internal fuel system. Under the top plenum there is a fuel reg and poppet valves that inject fuel into the cylinders. Sometimes the tubes that run fuel from the reg to the valves can leak and cause your problem. This cannot be found with pressure check because this occurrs after the reg. PS fuel mileage will go down. Let me know if this helps.Moe

Posted on May 26, 2009

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My 1998 chevy blazer has been having starting issues. and today just WONT start. turns over. fuel pump?


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If you have no fuel pressure than you'll want to check for power of the fuel pump. You should be able to find a spot where you can access the harness as close to the fuel pump as possible. You'll want to probe the large diameter grey wire. It should have power for 3-5 seconds as soon as you turn the key on and anytime the key is in the start position.

Another thing you can try is spraying a little carb spray down the throttle body. If it starts and runs than this is a classic sign of low fuel pressure. The injector poppets require high fuel pressure to open when you start the vehicle. When the vehicle is running the poppets are under vacuum and require less pressure to work.

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