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Rough running

Tiny
JEREMY400
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
So I got this truck about 6 months ago from the original owner. Everything on it is stock he didn't change anything. I did have to change plugs, wires, cap, rotor, and ignition coil. It ran just fine after those repairs. About 3 weeks ago I took it to work and I noticed that it started having a little hesitation like a misfire but it wasn't bad and the only code was for bank 1 sensor 2. But there is a little exhaust leak next to the sensor. So I drove it a few times after I noticed the hesitation/misfire again and it seemed to come and go. Well yesterday I took it to work again and something went. It runs pretty bad. When you give it gas it shakes. So I wanted to check for a possibly a bad plug. So I started it and pulled each plug wire off at a time and put back on and down the row. There wasn't any change in how the engine ran when I did that. It cant be driven right now. I was thinking maybe the distributor is on its way out? I don't want to start throwing parts at it. I am trying to properly find the problem. There is also a small odor of gas but not strong. I'm not sure if that's just cause the engine is running rough or what. It does fire up just fine though. Just runs really bad. Appreciate any advise.
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Monday, September 13th, 2021 AT 9:11 PM

37 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

What it sounds like you are experiencing is an issue with the "spider" injection. This is the fuel injection tubes mounted in between the upper and lower intake manifold. This is a common problem in these Vortec engine. I had the same issue in my 1997 K1500. I've owned a 1997 and 1989 K1500 so I know these trucks well. It would be a good idea to stick with the Delphi or AC Delco replacement as I've heard some people having problems with fitment-issue on cheaper brand replacement. Here is a tutorial showing how to replace an intake manifold:

https://www.2carpros.com/articles/replace-intake-manifold-gasket

I've attached picture steps below on how to replace the "spider" injection on your Chevrolet truck. I've circled the part in red. Pictured are my 2 below as well. Let us know if you have any further questions on this issue. Hope this helps and thanks for using 2CarPros.
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Tuesday, September 14th, 2021 AT 6:50 AM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
Would this by chance cause my plugs that I replaced not to long ago to look like there going bad? The cap which I also replaced has crusty stuff on the electrodes. Overheating?
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Tuesday, September 14th, 2021 AT 6:05 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Yes, it would cause new plugs to foul immediately and cause a slight misfire and slight hesitation on acceleration. The junk on the cap is it bad and how badly overheating? Hope this helps and thanks again for using 2CarPros.

Danny-
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Tuesday, September 14th, 2021 AT 8:16 PM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
The white crap is on all of the electrodes and when accelerating everything shakes pretty bad.
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Tuesday, September 14th, 2021 AT 8:37 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

How long ago was the distributor cap replaced? All signs however point to the "spider" injection problem I've mentioned in my prior post. Hope this helps and thanks again for using 2CarPros.

Danny-
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Wednesday, September 15th, 2021 AT 10:30 AM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
So I did put a new spider in there. One of the fuel injectors was not working. Now I can't get the damn Injector ports to lock in the engine. I'm not trying to break them from force. I did try a little oil on them to slide in and still didn't work. Any ideas? Thanks.
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Sunday, September 19th, 2021 AT 8:58 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would clean out the port before trying to instal the injector.

Can you upload a picture of the one you have trouble with?

Roy
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Tuesday, September 21st, 2021 AT 11:41 AM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
I cleaned all the ports. When I said one injector was bad I meant on the old unit. So on all of the new injectors the plastic part slides in the port just fine until it gets to the metal part of the injector. I tried pushing a little more but they won’t move. They do get snug but I can pull them out without pushing that one tab on the side. Should these be locking in place when I push them in?
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Tuesday, September 21st, 2021 AT 2:37 PM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
Here is the picture:
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Tuesday, September 21st, 2021 AT 2:39 PM
Tiny
ASEMASTER6371
  • MECHANIC
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What is that a picture of? It is not of any injector.

Roy
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Tuesday, September 21st, 2021 AT 5:43 PM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
I’ll have to get a better picture tomorrow. That’s a spider injector. The rest is in the hole. I just wanted to know if it has to click in or not. Or if it looks fine. When I took the old ones out I had to push a tab an pull them out. This is on a 1996 Chevrolet Silverado 5.7L vortec.
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Tuesday, September 21st, 2021 AT 6:01 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
They must go in and click to be sure they are seated. If you do not seat them, they can back out.

Roy
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Tuesday, September 21st, 2021 AT 6:03 PM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
That’s what the injector looks like. I just took it out. The black plastic part goes in fine up to the metal part. Then it won’t go in any further.
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Tuesday, September 21st, 2021 AT 6:10 PM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
Okay.
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Tuesday, September 21st, 2021 AT 6:10 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Is the black plastic part of the old spider or the new one?

Roy
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Tuesday, September 21st, 2021 AT 6:15 PM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
New one.
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Tuesday, September 21st, 2021 AT 6:23 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Are there holes on the bottom for fuel to come out of? I wonder if they are protectors for the injector when boxed and shipped.

Roy
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Tuesday, September 21st, 2021 AT 6:28 PM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
There are holes for the fuel. I was just doing a little research on these. There is a video on YouTube of a guy named “Klowny”. He does this same job an he says just to push the plastic all the way in until it hits the metal part of the injector. He has a video on it. Not sure if you want to check that out. I just don’t want them to flop out an have to rip that intake off again.
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Tuesday, September 21st, 2021 AT 8:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would assemble it but I have never had that issue prior to seeing this.

Roy
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Wednesday, September 22nd, 2021 AT 1:59 AM
Tiny
JEREMY400
  • MEMBER
  • 27 POSTS
Okay. Appreciate the help.
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Wednesday, September 22nd, 2021 AT 3:32 AM

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