Random misfire needing some help!
Thread Starter
Staging Lane
Joined: Sep 2010
Posts: 59
Likes: 0
Random misfire needing some help! Hey guys I've had my 2000 z28 for a little over a year now and haven't had any problems until yesterday. I had parked my car at a friends house over night and went out the next morning started my car and about half way down the road my shifter started to shake more than usual, then my ses light came on. I took it to a friends shop and used a scanner, it threw a p0300 code or random misfire, I checked pugs and wires then started it up and it ran fine but only for the rest of the day. Today I started my car all fine and dandy then the shaking began again. Would you guess be able to suggest some ideas where to start or what might be the problem, cuz I've heard it could be anything from o2 sensor to injectors to gummed plugs and so on. Any help is appreciated, thanks.
TECH Apprentice
Joined: Oct 2008
Posts: 330
Likes: 0
From: Wheaton, Illinois
Hey guys I've had my 2000 z28 for a little over a year now and haven't had any problems until yesterday. I had parked my car at a friends house over night and went out the next morning started my car and about half way down the road my shifter started to shake more than usual, then my ses light came on. I took it to a friends shop and used a scanner, it threw a p0300 code or random misfire, I checked pugs and wires then started it up and it ran fine but only for the rest of the day. Today I started my car all fine and dandy then the shaking began again. Would you guess be able to suggest some ideas where to start or what might be the problem, cuz I've heard it could be anything from o2 sensor to injectors to gummed plugs and so on. Any help is appreciated, thanks.
Hey guys I've had my 2000 z28 for a little over a year now and haven't had any problems until yesterday. I had parked my car at a friends house over night and went out the next morning started my car and about half way down the road my shifter started to shake more than usual, then my ses light came on. I took it to a friends shop and used a scanner, it threw a p0300 code or random misfire, I checked pugs and wires then started it up and it ran fine but only for the rest of the day. Today I started my car all fine and dandy then the shaking began again. Would you guess be able to suggest some ideas where to start or what might be the problem, cuz I've heard it could be anything from o2 sensor to injectors to gummed plugs and so on. Any help is appreciated, thanks.
But it didn't give you a code for a specific cylinder...right? That can be a ton of different things that cause "random misfires".
Get another scan to see how the 02 sensors are switching while the engine is hot and running............to rule those out.
A failing 02 sensor will totally kill your over-all power and the car will run rich and stumble when you accelerate.
I would not go WOT or get on it hard AT ALL until you fix this misfire........a bad misfire and hard driving can damage your engine badly....
.
Thread Starter
Staging Lane
Joined: Sep 2010
Posts: 59
Likes: 0
I am planning on doing a full tune up with my oil change. But one thing i noticed you said is the o2 sensor will make it run rich. I remember driving home and i would push the clutch in so i wasnt so ruff going up hills and i could smell that it was burning really rich.
And another question is, im getting ready to put long tubes in my car and a friend and i took all the exhaust off to make the install faster we left the cats and down pipes on. Would running it that way cause the o2 sensors to burn out or something?
And another question is, im getting ready to put long tubes in my car and a friend and i took all the exhaust off to make the install faster we left the cats and down pipes on. Would running it that way cause the o2 sensors to burn out or something?
I am planning on doing a full tune up with my oil change. But one thing i noticed you said is the o2 sensor will make it run rich. I remember driving home and i would push the clutch in so i wasnt so ruff going up hills and i could smell that it was burning really rich.
And another question is, im getting ready to put long tubes in my car and a friend and i took all the exhaust off to make the install faster we left the cats and down pipes on. Would running it that way cause the o2 sensors to burn out or something?
And another question is, im getting ready to put long tubes in my car and a friend and i took all the exhaust off to make the install faster we left the cats and down pipes on. Would running it that way cause the o2 sensors to burn out or something?
.
TECH Apprentice
Joined: Oct 2008
Posts: 330
Likes: 0
From: Wheaton, Illinois
I am planning on doing a full tune up with my oil change. But one thing i noticed you said is the o2 sensor will make it run rich. I remember driving home and i would push the clutch in so i wasnt so ruff going up hills and i could smell that it was burning really rich.
And another question is, im getting ready to put long tubes in my car and a friend and i took all the exhaust off to make the install faster we left the cats and down pipes on. Would running it that way cause the o2 sensors to burn out or something?
And another question is, im getting ready to put long tubes in my car and a friend and i took all the exhaust off to make the install faster we left the cats and down pipes on. Would running it that way cause the o2 sensors to burn out or something?
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Thread Starter
Staging Lane
Joined: Sep 2010
Posts: 59
Likes: 0
Update guys, I bought new wires and put them on and the car doesn't shake like it had been, but I hooked my diablosport tuner to it and still says I have the p0300 code along with a p0354 which I think it said coil problem. So maybe I need to change a coil pack or two.
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