93 GMC Sierra 5.7L - Sputter and backfiring under load

Ask our auto mechanics for help to all your GMC truck questions.
Post Reply New Topic
jt25
Posts: 1
Joined: Wed Oct 15, 2014 1:59 pm

93 GMC Sierra 5.7L - Sputter and backfiring under load

Unread post by jt25 » Wed Oct 15, 2014 2:04 pm

I have a 93 Sierra 1500 with the 5.7L V8 and it runs and idles find in neutral or park and when it is cold. When in gear under any load on the engine and once it gets barely warmed up the engine will start to sputter and backfire intermittently. The RPM's jump up and down by a couple hundred as you accelerate and then sometimes the engine drops out completely and even back fires before immediately regaining power. Sometimes it just seems as if it is starving for fuel.

But as soon as you put it in Nuetral the engine revs just fine!

I have no clue where to start. I can replace parts but diagnostics are not my thing.Please HELP!


User avatar
carriedi
Posts: 2266
Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: 93 GMC Sierra 5.7L - Sputter and backfiring under load

Unread post by carriedi » Fri Oct 17, 2014 12:06 am

you should scan the engine and see what the fuel is doing and look at your coolant temp sensor too. With a scanner on the truck and watching your data stream you can see if you're running lean or rich. Or if the fuel system looks good and maybe it's an ignition problem.
Browse "SIMILAR TOPICS" At The Bottom Of This Page.

Post Reply New Topic
  • Similar Topics
    Replies
    Views
    Last post