Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Recommended Posts

hi, i have a 97 chevy c1500 4.3 vortex v6 that was given to me. It had sat for about a year and a half before i picked it up. When i received it i put a new fuel pump and filter cleaned out the gas tank. It ran fine for 2 or 3 days and i drove 45 miles and it run fine. one day i drove it about 20 miles and it stalled, immediately when it started it would go then cut out again you couldn't go 50 ft without it losing power. The next day i changed the tps then cleaned the aic helped slightly but not much. Well come to find out my catalytic converter was blowing out honeycomb so we replaced it with a muffler since the real muffler had been cut (and no not directly under the truck we piped it out then put the muffler under the bed). It will idle but still wont run correctly i have heard there might be 2 fuel filters i will check that tomorrow. i will also ohm the 02 sensors to make sure the are working properly but they appear to be fine. Can anyone help me?

Edited by Bambam2806

Share this post


Link to post
Share on other sites

I have a 97' GMC Sierra K1500 with the 5.7L and it's got an O2 sensor mounted on each catalytic converter. If yours is the same configuration on the 4.3L, then i suspect by changing out the cat with a muffler, you'd get inaccurate O2 readings at the ECM.

Share this post


Link to post
Share on other sites

I had a similar problem on my 96 k1500 come to find out it was a $13 relay that was bad. Which made a bad connection which added up to wrong/no fuel pressure. And even now sometimes it rattles loose and runs funny I just have to push it back down and away I go.

Share this post


Link to post
Share on other sites

And the sensor after the cat doesn't change how it runs its supposed to measure how well the cats working. The two front ones change the fuel mixture. How is it at idle? Do you have any codes? Have you checked the dist. Cap wires and plugs? Or maybe a vacuum leak? Just some ideas let us know what you find good luck!

Share this post


Link to post
Share on other sites

Ok I replaced that relay ill check to make sure it's pushed down. no in fact after I cut that o2 off the check engine light cut off and has not come back. I changed the distrib. Cap and rotor button that got it drive able it's still not right though, I changed the plugs also. I used sea foam and it blew out a tremendous amount of carbon when it did so right now I have no idea. After the sea foam it idled perfect.

Share this post


Link to post
Share on other sites

Bad news went for a drive this afternoon didn't even make it to the end of the driveway it's actin like it ain't getting fuel again...

Share this post


Link to post
Share on other sites

That's true. What about the fuel pressure regulator? Maybe have the fuel pressure tested and see how much pressure is getting there.

 

You could disconnect the engine side of the fuel filter and turn the key on then atleast you would know if its getting past there or not but it should e with the new filter. Does it still idle good?

 

Maybe a vacuum leak making it run really lean? Maybe take the air filter off and see if it helps.

 

Has the cel come back on?

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.