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Engine runs rough, will not idle

Tiny
KMCCONAUGHEY
  • MEMBER
  • 1997 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 124,977 MILES
I just replaced the lower intake manifold gasket. I know the push rods are in the correct location and the firing order is right. It runs really rough. I suspect the fuel injectors. What do you think
Friday, January 28th, 2011 AT 11:15 PM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
It sounds like you didn't have this problem before so why would the injectors suddenly have a problem. Make sure you are correct about the push rods as they are slightly different between intake and exhaust. Make sure you have correct plugs on the injectors also.
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Friday, January 28th, 2011 AT 11:59 PM
Tiny
KMCCONAUGHEY
  • MEMBER
  • 4 POSTS
It ran fine when I took it apart. The fuel rail came out really hard and went back in hard. What do you mean when you say ( have the correct plugs on the injectors )? The push rods are about a 1/4" dirrerent. The shorter ones go to the intake and longer on the exhaust.
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Saturday, January 29th, 2011 AT 12:30 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
Do you have the right wires going to the right injectors.
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Saturday, January 29th, 2011 AT 12:51 AM
Tiny
KMCCONAUGHEY
  • MEMBER
  • 4 POSTS
I have checked and rechecked the wires and the harness connectors are all different. None are the same pin type. I layed the fuel rail off to the side when I tore it apart. I did take the fuel back off and changed all the o-rings. I also changed the spark plugs since they were in for a while. It seems to be vaccume or electrical.
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Sunday, January 30th, 2011 AT 10:44 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
I don't know what you're looking at but all of the injector plugs are identical except for the wire colors.
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Sunday, January 30th, 2011 AT 11:09 PM
Tiny
KMCCONAUGHEY
  • MEMBER
  • 4 POSTS
I never disconnected the wires from the injectors. I left the wires on the fuel rail and layed it back next to the hood on the drivers side fender well
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Sunday, January 30th, 2011 AT 11:23 PM

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