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1996 Chevy Lumina Running Rough, Missfiring and a liitle he

Tiny
SIMARD1
  • MEMBER
  • 1996 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 138,000 MILES
I have a 1996 Chevy Lumina with a 3.1L engine. The problem I have is that the car is misfiring with some hesitation. The code P0305 is coming up on the “Service Engine Soon” light. I have changed the Spark Plugs, Wire Set, Coil for #5 Cylinder, Fuel Filter, and I put cleaner for the Fuel Injector and it is not doing anything, I have been doing that for the past 3 weeks. By the way, every time I go up a little hill or something the “Service Engine Soon” light would flash a couple times. Could you help me with that?

I have checked/replaced the following parts:

1. Spark plugs and wires
2. Fuel Filter
3. PVC Valve
4. Ignition Coil
5. Throttle Position Sensor
6. EGR Valve
7. Distributor
8. MAP Sensor
9. Air Filter
10. Coil Pack
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Sunday, September 28th, 2008 AT 11:05 AM

12 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Misfire at no.5 check compression and injector

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Sunday, September 28th, 2008 AT 11:23 AM
Tiny
SIMARD1
  • MEMBER
  • 8 POSTS
Rasmataz,

I need to know how to replace a fuel injector on that 1996 Chevy Lumina with a 3.1L engine. If you could help me with that it would be great.

Thank you for all your help rasmataz.
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Sunday, September 28th, 2008 AT 5:29 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
See below sir-follow it accordingly


https://www.2carpros.com/forum/automotive_pictures/12900_intake_1.jpg



https://www.2carpros.com/forum/automotive_pictures/12900_inj2_1.jpg



https://www.2carpros.com/forum/automotive_pictures/12900_intake_2.jpg



Good Luck and TY for using 2carpros
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Sunday, September 28th, 2008 AT 10:14 PM
Tiny
SIMARD1
  • MEMBER
  • 8 POSTS
Rasmataz,
Thank you so much for helping me with that. I am installing the new injector today and testing the cat tomorrow (9/30/08). If this doesn't solve the problem, what next? Thank you for all your help. Thank you.
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Monday, September 29th, 2008 AT 6:51 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I'll be here waiting
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Monday, September 29th, 2008 AT 7:29 PM
Tiny
SIMARD1
  • MEMBER
  • 8 POSTS
Rasmataz,
that injector didn't do a thing. It is still running like crap. Could you help me with that? I have no idea what is could be next. Thank you for all your help.
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Tuesday, September 30th, 2008 AT 2:13 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check compression both dry and wet-and check the fuel pressure, also recheck for code/s
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Tuesday, September 30th, 2008 AT 4:16 PM
Tiny
SIMARD1
  • MEMBER
  • 8 POSTS
Rasmataz,
I checked everything at a car service center for that and he said everything checks out at car's recommendations. What could it be. What should I do/replace now?
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Tuesday, September 30th, 2008 AT 5:52 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What was the fuel pressure readings?
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Tuesday, September 30th, 2008 AT 7:16 PM
Tiny
SIMARD1
  • MEMBER
  • 8 POSTS
I dont remember. One of my friends stopped by and did it with his tools he had in his box truck. What are the most common places to have a vacuum leak? Thank you.
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Tuesday, September 30th, 2008 AT 7:21 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The EGR creates massive vacuum leak if its cracked open, intake manifold, PCV system, brake booster and hose, vacuum hoses
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Tuesday, September 30th, 2008 AT 7:32 PM
Tiny
SIMARD1
  • MEMBER
  • 8 POSTS
Rasmataz,
I checked the upper manifold gasket and it is brand new. What could it be next? I'm going to check the #5 spark plug to see if it looks ok. After that I don't know what to do, I'm about to trade it in for a new car. I'm really getting tired of it. Hope you can help me. Thank you and reply A.S.A.P. Thanks.
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Thursday, October 2nd, 2008 AT 7:10 PM

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