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Old 01-29-2013, 12:26 AM   #1581
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Originally Posted by Cinderocka1989

I'll spray some throttle body/carb cleaner down it while I'm doing the cap and rotor, I have to have it open anyway.
Very first thing I would try in a new fuel cap.
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Old 01-29-2013, 01:01 AM   #1582
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Very first thing I would try in a new fuel cap.
But it's not an evap code....??
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Old 01-29-2013, 01:15 AM   #1583
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Cinder,
What year make and model is it? Possibly a cracked cap or maybe a bit of moisture in the cap? (if it is that old).

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Old 01-29-2013, 01:25 AM   #1584
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Cinder, check the A/C line. if it runs across the back of the motor near the firewall, it could be condesation from the line dripping on the distributor cap and causing a misfire. easiest way to check for this is to look inside the distributor cap and see if it a green colored looking corrosion inside it.

some Chevy and GM trucks, Surburbans, and Tahoes had this problem. not saying it is, just something to check out.

might also check the O2 sensors. sometimes they can cause a misfire code of P0300 to show up.

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Old 01-29-2013, 01:36 AM   #1585
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Cinder,
What year make and model is it? Possibly a cracked cap or maybe a bit of moisture in the cap? (if it is that old).
97 Chevy Suburban, 5.7 so it has a distributor.
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Old 01-29-2013, 02:31 AM   #1586
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Originally Posted by Cinderocka1989 View Post
Yeah I got tune up stuff and possibly fuel pressure regulator. I don't think it's the fuel pressure regulator, it starts, runs good and doesn't smell like gasoline. He has to get it registered this month and that light has to be off to pass emissions.
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Possible bad injector? My Nissan Quest had a bad injector that was causing a misfire and it would throw different codes.
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Very first thing I would try in a new fuel cap.
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Originally Posted by Cinderocka1989 View Post
But it's not an evap code....??
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Originally Posted by axxe55 View Post
Cinder, check the A/C line. if it runs across the back of the motor near the firewall, it could be condesation from the line dripping on the distributor cap and causing a misfire. easiest way to check for this is to look inside the distributor cap and see if it a green colored looking corrosion inside it.

some Chevy and GM trucks, Surburbans, and Tahoes had this problem. not saying it is, just something to check out.

might also check the O2 sensors. sometimes they can cause a misfire code of P0300 to show up.
Yep, I dont miss newer cars any.....
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Old 01-29-2013, 02:32 AM   #1587
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Quote:
Originally Posted by kycol View Post

Very first thing I would try in a new fuel cap.
Quote:
Originally Posted by axxe55 View Post
Cinder, check the A/C line. if it runs across the back of the motor near the firewall, it could be condesation from the line dripping on the distributor cap and causing a misfire. easiest way to check for this is to look inside the distributor cap and see if it a green colored looking corrosion inside it.

some Chevy and GM trucks, Surburbans, and Tahoes had this problem. not saying it is, just something to check out.

might also check the O2 sensors. sometimes they can cause a misfire code of P0300 to show up.
I'm not saying either of you are wrong, I'm just trying to learn. I've seen fuel caps throw evap codes. How would that cause a misfire code?

Axxe I've seen bank 1 or bank 2 lean or bad cat codes for oxygen sensors.

I just think it's weird that it went from multiple cylinders to just cylinder 1. If it's just the one cylinder it would have to be a plug or a wire right?
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Old 01-29-2013, 02:33 AM   #1588
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Yep, I dont miss newer cars any.....
Hey, it isn't mine.
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Old 01-29-2013, 02:38 AM   #1589
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Originally Posted by Cinderocka1989 View Post
I'm not saying either of you are wrong, I'm just trying to learn. I've seen fuel caps throw evap codes. How would that cause a misfire code?

Axxe I've seen bank 1 or bank 2 lean or bad cat codes for oxygen sensors.

I just think it's weird that it went from multiple cylinders to just cylinder 1. If it's just the one cylinder it would have to be a plug or a wire right?
have you checked the plugs or wires?
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Old 01-29-2013, 03:05 AM   #1590
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Quote:
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have you checked the plugs or wires?
Plugs and wires? Man, I'm a f***ing diesel mechanic, the hell are you talking about?

But no, I haven't checked anything yet, just throwing some possibilities around. The last thing I want is to be the "mechanic" that just throws parts at a problem....
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3 gallons of crazy in a 2 gallon bucket

Know your limits; exceed them often

That which does not kill me had better run pretty damn fast.

Sticks and stones may break my bones but hollow points expand on impact.


Last edited by Cinderocka1989; 01-29-2013 at 03:08 AM.
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