1997 monte carlo p0302 - Engine Troubleshooting


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

1989 toyota pickup 3.0 crank no start

I have a 1989 toyota pickup 3.0 crank no...

Strut spring orientation and strut mount tension nut

2017 Nissan rogue awd 2.5 L Put in Monro...

Transmission stuck in part, I have tried everything

So I'm working on my elderly fathers 201...

2017 dodge journey LED headlights on/off randomly

Year of vehicle 2017 Make of vehicle dod...

Kia Soul starter replacement issues!

Okay so my car is a 2010 Kia soul 2.0 en...

Please Help - Knock sound & engine fail

Hi all, Hoping to get some insight and ...

multiple warning lights

2013 GMC Terrain 130,000 miles 4 cylinde...

03 alero no low speed blower

Good day everyone, I have a 2003 Olds a...

04 Chevy 2500hd tail light issues

Help!!! I have changed my combo switch...

1999 Grand Caravan Sport not starting.

Hi. I'm new here. I hope someone can hel...

1997 monte carlo p0302

Sign up here!

Search for (search options)

Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

VPdan21
Novice

Oct 17, 2011, 7:49 PM

Post #1 of 3 (2561 views)

1997 monte carlo p0302	Sign In

1997
Chevy
Monte Carlo
3.1
132k

Hey guys, feel like I have been posting here far too much lately. Just cleaned out my EGR port and changed a cat about a month ago. I am now wondering if this continuing problem ruined the cat in the first place. Ever since I bought this car about 6 years ago, I have a cylinder misfire now and then. From what I can remember, before I had a scan tool, I would take it to autozone where it would show cylinder 6 misfire. Anyway, as you can see by the code, it is now cylinder 2. So here's what happens....

This seems to be pretty random, but I think I've noticed it mostly after rain?

After I start the car, it will start idling very rough. After I put the car in gear and start driving, the check engine light will flash and the car runs rough mostly at slower speeds. When I get up to about 40-50, it feels a bit better. However, when I slow down and stop again, idles rough but never dies. After about 5-10 minutes of driving, all of a sudden you can feel the engine catch and start running normal. Check engine light stays on but solid now coming up p0302.

Coil pack? plug? wire? fuel injector? Figure it is probably one of these, but hoping to get a push in the right direction.

Thanks, you guys are the best!

Blulakr
User

Oct 17, 2011, 8:42 PM

Post #2 of 3 (2539 views)

Re: 1997 monte carlo p0302	Sign In

Are you having to add coolant with no apparent external leaks?? If so then it is leaking coolant internally either thru the intake gasket or cyl head gasket.

The car sits and leaks coolant into the cyinder or intake passage. As the car runs it clears out the coolant and eventually smooths out.

Or..... You have an intake gasket that is leaking vacuum when cold. As the engine warms up the intake expands, seals the vacuum leak and runs better.

VPdan21
Novice

Oct 19, 2011, 7:01 PM

Post #3 of 3 (2516 views)

Re: 1997 monte carlo p0302	Sign In

thanks for the reply blulakr. no coolant loss, but i can definitely spray to see if maybe a vacuum leak.

Search for (options) Privacy Sitemap