Guests - If You want access to member only forums on HSO. You will gain access only when you Sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
Whoaru99

1994 Chevy k1500 5.7L running rough and no power

8 posts in this topic

Wouldn't you know, Friday afternoon before Memorial weekend, old trusty decides to act up, nearly causing the camping trip to be called off. Luckily the GF's minivan had a towing package on it adequate for pulling the pop-up to save the weekend .

Had been running fine as I pulled it around to the side of the garage and shut it off. Then, after I threw in the last few items and started it up, it started fine then just like you flipped a switch, started running rough...like it was missing on several cylinders.

Figured maybe it just needed to be driven around the block to clear it out, but it barely would drive and idled very low. Barely enough power to move itself.

Through it all, the "Check Engine" light has not come on (except startup lamp test), and it starts fine.

Any thoughts about where to start?

Share this post


Link to post
Share on other sites

My guess, and I am no mechanic at all, is that your plug wires are shot. Getting poor or no spark. just a guess...

Share this post


Link to post
Share on other sites

Start it up, let it idle, and see what happens when you spray a little carb spray in the throttle body. Does the idle smooth out?

Share this post


Link to post
Share on other sites

OK, so I got geared up to try the carb spray suggestion, but before I even sprayed any in, I noticed that one injector (of the pair) wasn't spraying fuel into the throttle body.

Did a cursory inspection of the wires right around the TBI and didn't see anything unusual so I wiggled the wires going to the TBI and to that specific injector. Watched for another minute or two but no change, still was running rough and same injector not spraying.

No more than got around the side of the truck to the driver's door to shut off the engine and it smoothed out and the injector was now spraying.

Hmmm....?

Share this post


Link to post
Share on other sites

You got ahead of the direction I was going but there you go. Next time it flakes out ohm the injectors they should have almost exactly the same resistance. If the one that is not working has lower or open resistance than replace it.

These also have issues right where the wires bend around the throttle body under the air cleaner.

Share this post


Link to post
Share on other sites

Checked the injectors with the ohmmeter and sure enough, the curb side (RH from driver's seat) injector was giving a flakey reading.

It was initially higher than the LH injector so I gently wiggled the pins right on the injector and the reading fluctuated from around 5 ohms to open circuit. The LH injector reads a steady 1.4 ohms.

Darn...those little buggers aren't cheap.

Wonder if I should replace both just for good measure since the truck has >200K miles?

EDIT: Yeah baby!!!

On a whim I checked with a guy I know and he had a partially parted out TBI from another 5.7L, but it still had the complete fuel meter body with injectors. Checked the resistance of the injectors, both 1.5 ohms, swapped it out (REALLY easy) and she's back to purring like a kitten!!

Total cost? $10 and a hours time.

Share this post


Link to post
Share on other sites

Plus the consultation fees! Just make the check payable to........ grin

Share this post


Link to post
Share on other sites

I certainly do appreciate your advice that got me headed in the right direction from the get-go!!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0



  • Posts

    • That's called seasoning. Two years ago I took a trip to Germany and we spent a few days in the black forest where I got to see some authentic old world smoke houses dating back to the 1500's and the amount of buildup on the walls, hooks, poles etc is part of what gives their hams,bacon and sausage their flavor. They use juniper wood for smoking. Absolutely delicious.  But yeah, foil, Pam and other things can help. You can also use a power washer to clean them.
    •   "We have found they do not like limburger cheese, hot dogs, or Makers Mark bourbon.  I am thankful for that."   Thanks for making my nite.  
    • Also woodpeckers beat on stuff to mark their territory.   I am pretty sure that there aren't any bugs on my metal downspouts.
    • You will often discover that birds are picking very small insects from decks and other woodwork around your house;  they do the same with trees and any other structure that might hold the bugs. We see them often on our decks and they usually pick a little bit and then move on,  perhaps just checking to see if there is anything edible there. These rascals also love hummingbird or oriole nectar, sunflower seeds and of course suet in winter. We have discovered  many species that will head straight for the nectar for orioles or hummingbirds and also plunge their beaks eagerly into the grape jam bowls orioles love. Birds will eat a greater variety than you might think. We have found they do not like limburger cheese, hot dogs, or Makers Mark bourbon.  I am thankful for that.
    • And pretty soon there'll be little chinese restaurants springing up everywhere...there goes the neighborhood. 
    • I use the ball of aluminum foil, too. Works well.
    • lay them in the grass over night and wipe off in the morning.  the dew soaks in if it's moist out.  other wise lay them out and place wet towels over them for awhile..
    • What do you have against Japanese Beetles?   Diversity is good.   We need all nationalities of beetles.  Even VW beetles.   Asian Lady Beetles, everything.  All nationality and gender identity beetles. 
  • Our Sponsors