Question about 1993 Chevrolet C/K 3500

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I put a new fuel pump on and it still acts like the pump is still has a bad pump 93 k 3500,is there a map sensor on it?

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The only way to know for sure on the fuel pump is to plumb in a tap for pressure. I think the range is 9.5 to 11.5 psi.

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

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losflip
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SOURCE: my 1989 silverado surges really bad in mornings when cold

HI, You need your coolant temperture to run 195 degrees, start by replacing thermostat with correct part and re-check..

Posted on Dec 01, 2008

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SOURCE: 96 cavalier 2.2 in drive the car pokes along it

Check the catalitic converter for being plugged up.

Posted on Apr 07, 2009

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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

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SOURCE: We have a 1993 Chevy C1500 with a 5.7 that is

something is creating alot of air to pass over the 02 sensor.


Low compression
Big vacuum leak.
Weak ignition
IAC stuck a little open.
TPS that is saying your foot is on the gas when it is not.
EGR stuck open a little.
Too low an idle
Weak spark plugs
Bad fuel pressure regulator
No vacuum to the fuel pressure regulator.
Bad coolant temp sensor.

What are the readings. Need to know the co and the hc reading in order to know if you have a misfire or an over fueling issue. All 5 reading are really needed to diagnose fuel related issues sight unseen

Posted on Dec 17, 2009

  • 180 Answers

SOURCE: runs poorly(very Rich, stumbles) when map sensor

If it is fuel injected you may have a bad fuel pressure regulator. The regulator is attached to intake manifold with a vacuum hose and the bladder sometimes fails causing gas to be dumped directly into the intake manifold. Only solution is to replace the fuel pressure regulator.

Posted on Dec 10, 2010

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Usually when an engine dies and won't restart, it is a gas or spark problem. Listen for the fuel pump to turn on with key in on, not start-it should turn on for about 2 seconds to put pressure in the fuel line and up to the engine. If the pump is working, next check for spark at a spark plug wire, with the engine being cranked over. If you have a blue, snapping spark, the ignition is probably good. If no spark, it could be a bad ignition coil, a bad Ignition Control Module, or possibly a bad Crankshaft Position Sensor.

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If the engine is getting spark at the right time, and has normal compression, and no fuel to the injectors, you should be able to get it to start by spraying carb cleaner into the throttle body.
That will tell you if it is a fuel problem.

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what year? a bad map sensor will cause rough running and sputtering and very bad smell like a rotten egg smell through the exhuast. try tapping on it lightly with a scewdriver when running or trying to start, if it acts up when tapping, that is the cause and very easy to replace. when the fuel pump was replaced, you need to replace the fuel filter. the filter clogging is almost always the cause of the pump going bad.

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I have a 1987 gmc shortbox pickup with a 305. it has the throttle body. i cannot get it to run properly. when it idols you can smell fuel. it will eventually die when idoling. almost like its flooding out....


Sound's like running rich, you need to scan your computer and check data for ect sensor (coolant temp sensor ) if bad temp reading will run rich and map sensor, both act like a chock in your truck, check for vacuum at map sensor do not disconnect harness from sensor or will give you code for map sensor .Hope this was helpful.

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sounds like your egr valve is stuck open. check for false vacuum signal to egr valve holding it open or for a plain old bad stuck open EGR valve.

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Have you changed the fuel filter.If you have run a temerary feul pipe from the tank to the carb sounds like a fuel restriction,

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