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93 chevy c1500 4.3 running problem....


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yamahayz80rdr
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Oct 10, 2011, 3:59 PM

Post #1 of 5 (2576 views)
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93 chevy c1500 4.3 running problem.... Sign In

1993 chevy c1500 with the 4.3L: starts up and runs fine for about 10-15 minutes, and will die. Goes down the road great, might act up a little when you let off the gas (quivers and shutters a bit), but when you coast to a stop, it will just die as if you turned the key to off. Won’t start up unless you let it sit for a wile.

Things I’ve done: Fuel pump, fuel pump relay and wiring, tps, map sensor, injectors, throttle body, intake gasket, cap, rotor, plugs, wires. (some of the thing I did were because of other problems like the fuel pump relay was a problem and the map and tps was an idle and running problem which are fixed now…..)

When it stalls I can smell gas. It seems to me like a wiring problem but I have no clue where to look.. No spark??? Bad ground?? Compression test was good….WTF! Help please?


Hammer Time
Ultimate Carjunky / Moderator


Oct 10, 2011, 4:47 PM

Post #2 of 5 (2545 views)
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Re: 93 chevy c1500 4.3 running problem.... [In reply to] Sign In

 All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



yamahayz80rdr
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Oct 10, 2011, 5:15 PM

Post #3 of 5 (2541 views)
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Re: 93 chevy c1500 4.3 running problem.... [In reply to] Sign In

The reason why i put the fuel pump in was because i bought the truck from this guy who was going to scrap it and the truck sat for a few years. When i first got the truck it had low fuel pressure so i put a new fuel pump in it. It still didn't run, and found out the when i turned the key to on, the fuel pump wasn't "humming" like it should for about 2 seconds when you turn the key on. I found the fuel pump relay and found it had bad wires going to it and was shorting out and just bad, so i replaced some wires and buttoned it up a bit to make it look pretty.

A few months after that it wouldn't run right like it had a vacuum leak, so i went through it and checked all the vacuum lines and found out that when i pulled the line from the map sensor and plugged it up the truck ran fine. So i snagged a map sensor off of another chevy and it fixed that problem.

Not to long after that it stated to do this, so i was fed up and took it to the dealership and they found a bad ground on the firewall and fixed that (which help fixed my gages work better) and it made the truck last longer but not fully fix it.

The cap, rotor, plugs and wires were just part of a tune up i did because the truck sat for so long and i injectors and throttle body was because thats what i originally thought was the problem when it wasn't getting fuel. Whatca think?


Hammer Time
Ultimate Carjunky / Moderator


Oct 10, 2011, 5:44 PM

Post #4 of 5 (2537 views)
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Re: 93 chevy c1500 4.3 running problem.... [In reply to] Sign In

I don't need any of that. I just need the results to all the test I gave you.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



yamahayz80rdr
New User

Oct 10, 2011, 5:47 PM

Post #5 of 5 (2535 views)
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Re: 93 chevy c1500 4.3 running problem.... [In reply to] Sign In

alright i'll get to it tomorrow




93 chevy c1500 4.3 running problem....


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