Question about 1987 Chevrolet Nova

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1987 k-5 blazer cranks and starts but won't stay running

Throttle body sprays out gas when key is turned, it will start but only for few seconds, rapidly pumping fuel pedal keeps running but very rough and dies right away after stopping pumping, 350 engine in it.

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  • uturn022765 Jan 25, 2009

    Thank You gasitjr Will try and check all your suggestions, sounds like you have the problem solver, Thanks Again.

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Sounds like a large vacuum leak,low fuel pressure,fuel pressure regulator failure, idle air control valve stuck open,plugged fuel filter.Also check for good consistent blue spark at spark plugs or jumped timing chain.Hope this helps!

Posted on Jan 25, 2009

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Maybe a problem in the fuel pump circuit. Check fuel pressure with engine off, and key turned to on, not start. If no pressure, diagnose the pump circuit at the fuel pump relay. One terminal for the relay would be the power feed for the pump. The engine computer signals the relay on for 2 seconds with key on to prime the system, also signals during engine cranking.

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Hello
It sounds like a glogged fuel filter or throttle body problem. Disconnect gas line at carb get a small jar or can to catch gas, hold gas line in jar and have someone crank engine, If you have good gas flow to carb then Its a throtle body problem, (Throtle body and carb are same thing just in case you did not know)could be electrical or mechanical problem at throttle body, Its usually electrical, fuel flow meter. Hope this helps

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you need to sort out if fuel or spaark issue. Can you hear fuel pump in gas tank run for 5 seconds when you turn the key to ON? Spray a burst of starting fluid into the throttle body or bgi air intake hose and see if it starts for a few seconds. If yes, then you have a fuel issue, maybe need a pump. Need to drop the tank to do that though. Check for 40 psi of pressure first.

If not, then it could be no spark. bad crank sensor, cam sensor, etc.

Is the yellow check engine light on too? If yes, get codes to find cause.

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1 Answer

Durango starts sometimes. then acts like its getting no gas and dies. if i stomp on gas it will keep running till i let off. bad gas ? fuel filter ? fuel pump?


I would suggest starting with the less expensive solutions first. If you pull the air intake hose off the throttle body and open the throttle with the engine off look down inside if it is black try spraying it out with throttle body cleaner make sure to spray it out good. Afterwards start it you may have to keep your foot on the gas for a few minutes to make sure it doesn't stall then take your foot off the gas pedal and see if it stays running if it does your throttle body just needed cleaned. Note do not use carb cleaner use throttle body cleaner only, carb cleaner can damage the sensor in your throttle body.

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1 Answer

My 1997 grand cherokee will not stay started. it will crank over but when i let off the gas pedal it cuts off


If it runs o.k. until you let off the gas pedal, I'd take a few minutes & remove the AIS,or IAC motor (same thing) and spray it well with throttle body spray cleaner, especially pintle (pointed part) and the port (hole) it comes out of on throttle body, and then replace it & try that. If it cures it for a while & then starts to do it again, replace it.

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One of the biggest problems I see that causes this is coking in the throttle body throat.It is easy to fix. Remove the air intake tube from the body, get you some B-12 spray cleaner from your local parts house and a shop rag. Wet the rag good, push the throttle open and wipe out all the black coking you see. You can spray some of the cleaner into the throttle body but if you use too much you could foul the plugs or hydro-lock the engine so again, if you spray it into the body, don't use too much.

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1 Answer

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take your distributor cap off and check the ignition module for loose wires or even a ground strap thats connected to the engine to the body , you can take the module to autozone and have it checked for free, it might have a crank position sensor thats going wacky

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I would check and see if this is your fuel pump. Spray starting fluid in the throttle body right underneath the air horn and if its starts it's your fuel pump. Try turning your key three times but do not start it the first two times and your third time let it cycle for a second then turn the key to start. If it starts during one of these tests it's your fuel pump. Of course check battery and cables, plugs and wires, fuel in the tank, and starter. Autozone offers free tests on your electrical system. I hope this works for you!

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3 Answers

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