1997 Chevy Silverado Runs on 7 Cylinders

1997 CHEVROLET TRUCK
Avatar
BOFREDDY
  • MEMBER
  • 3 POSTS
I had to replace the intake manafold gaskets on my 97' Chevy Silverado 5.7 liter V8. I was having overheating problems and checked the pressure in my cooling system and found the problem. Anyway, That being fixed, I got it back together and running but it was running a little rough and the check engine light came back on. I went and had the code read and it said the 2 cylinder was fowled. I replaced the rotor cap & the plugs. The Plug wires are new so I switched the wire with another wire to see if the other cylinder would do the same thing. It didnt. The new 7 plug was wet with gas. The truck starts up on a pinch and runs but is running rough. and has a little shake on exceleration. Not bad enough to drive but it is eating the gas.

Could it be a sticking valve? I have 178,000 on the truck. If the valve is not seating what should I do?
If its not what I am thinking do you guys have any suggestions?

Bofreddy :?
Apr 21, 2006 at 2:10 AM
Advertisement
Avatar
LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
If you have the Vortec engine it sounds like you have a injector problem. As you know they are plastic hoses that run from the injector module to each cyl inside the intake manifold. The clue is you had the intake off.
Apr 21, 2006 at 5:17 AM
Avatar
BOFREDDY
  • MEMBER
  • 3 POSTS
I did take the manifold off and cleaned the hoses and everything. I tried to be pretty careful with it. How can I check to see if that is it?

Take off the manifold & then...
Apr 21, 2006 at 9:17 AM
Avatar
LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
You need to take off the intake again and replace that injector. A tine dent in the line or the injector can cause a flood condition. Unfortunatly, the hose comes as part of an assembly. There is a possability that the fuel pressure regulator is bad and forcing excess fuel into that injector. It also is part of the $600 assy. Good luck
Apr 21, 2006 at 10:47 AM
Avatar
BOFREDDY
  • MEMBER
  • 3 POSTS
$600? what a deal! Just kidding. I will take a look and see if I kan find the kink in the hose. Thanks for the advice


Bofreddy
Apr 22, 2006 at 12:50 AM
Avatar
LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Sadly it is not one of GM's better ideas. It costs over 1.5K at a dealership and so far there is no recall. It happens in a number of years at around 85K+
Apr 22, 2006 at 1:34 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.

Suggested Repair

Remove the intake and inspect the cylinder 2 Vortec injector and its plastic fuel hose for a kink or dent that can flood the cylinder. Replace the injector hose assembly if damaged, and also check the fuel pressure regulator, which is part of the same assembly.

Conversation Summary

A 1997 Chevrolet Silverado 5.7 ran rough on seven cylinders after intake manifold gasket replacement, with a cylinder 2 code and a fuel-wet plug. Swapping the plug wire did not move the problem. The expert attributed the flooding to a damaged Vortec injector or plastic fuel line inside the intake, or possibly a bad fuel pressure regulator in the same expensive assembly, and advised removing the intake to replace the affected injector.

Related Repair Questions

Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle