P0300
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From: Cape Coral, Florida
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Melting Slicks
Joined: Mar 2018
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From: California
The dealer says it’s got fuel,spark,ect. They wanted to take off the valve cove inspect the valves and if needed do leak down test. Has been narrow down to a misfire in cylinder 1
im gonna inspect the springs valve and head on my own. They suspect a bad spring or valve seat possible valve. Nothing past that. Car has run better now still stammers at idle how ever when the car shuts off you can hear air rushing out eithe the passenger side valve cover or intake maybe this is normal it’s coming out somewhere .
im gonna inspect the springs valve and head on my own. They suspect a bad spring or valve seat possible valve. Nothing past that. Car has run better now still stammers at idle how ever when the car shuts off you can hear air rushing out eithe the passenger side valve cover or intake maybe this is normal it’s coming out somewhere .
Last edited by Speedy007; Jul 6, 2018 at 05:52 PM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,494
Likes: 3,999
From: Cape Coral, Florida
Well, we KNOW the car has fuel and spark !!...DUH... LOL !!!...these dealerships are something else...a good thing having a scan tool you can check misfire counters to see if it's a specific cylinder...this pic is what you want to see on a scan tool...LOL !!...HANG IN THERE !!...I know this can be frustrating...now it COULD be a bad injector being it's cylinder specific...best test is a fuel injector leak down test to verify beyond "a reasonable doubt" !!!
Last edited by C5 Diag; Jul 6, 2018 at 05:00 PM.
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The dealer says it’s got fuel,spark,ect. They wanted to take off the valve cove inspect the valves and if needed do leak down test. Has been narrow down to a misfire in cylinder 1
im gonna inspect the springs valve and head on my own. They suspect a bad spring or valve seat possible valve. Nothing past that. Car has run better now still stammers at idle how ever when the car shuts off you can hear air rushing out eithe the passenger side valve cover or intake maybe this is normal it’s coming out somewhere .
im gonna inspect the springs valve and head on my own. They suspect a bad spring or valve seat possible valve. Nothing past that. Car has run better now still stammers at idle how ever when the car shuts off you can hear air rushing out eithe the passenger side valve cover or intake maybe this is normal it’s coming out somewhere .
Interesting! Very interesting!
Obviously, I am missing something!
Hope that takes care of your issues and you can start enjoying your car!
Last edited by Route99; Jul 6, 2018 at 08:20 PM. Reason: Added comment
Thread Starter
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
Yellow spring is this original? On a 2000 5.7 ? I’ve saw these coming on a ls6, ls2 z06 243 head...would anyone happen to have a part number ? I would hate to throw a regular spring on and it needs to be a performance spring. I’ve read the yellow have a higher lift then blue ones
Last edited by Speedy007; Jul 6, 2018 at 08:40 PM.
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Joined: Oct 2014
Posts: 95
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From: Colorado Springs Colorado
It is not original in that motor...or at least in the motor that came in a 2000 coupe. You would not by chance have a video of it idling would you?
Last edited by jvettman; Jul 6, 2018 at 08:46 PM.
Thread Starter
Melting Slicks
Joined: Mar 2018
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From: California
Found the cylinder head numbers are 853 casting D270 18 on the inside l. The 1st owner did mention to me that he had ordered it from the factory with every option and upgrade.
im gonna guess the better springs were part of it.
im gonna guess the better springs were part of it.
Last edited by Speedy007; Jul 6, 2018 at 09:27 PM.
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Joined: Oct 2014
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From: Colorado Springs Colorado
I posted here before somewhere on here when I first got it. It seems to run real strong like something was upgrade. I bought it as is at a dealer. The 1st owner said he ordered everything possible from the factory Dunno if 2000 had a upgraded 243 head possibly? Or it’s a after market. Number inside the head reads D270 18. I search and race heads pop up. The spring is looks like a ls6 beehive yellow spring..I’m not entirely sure at the moment.
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Joined: Oct 2014
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From: Colorado Springs Colorado
853 would be correct for a 2000...but I still don't think those ever came with yellow springs.
Here is what I think...someone who had that car had a friend with a Z06 and that friend did an upgrade on cam and springs. He gave his old cam and springs to his the previous owner who installed them in your car. There is really no way to know for sure without pulling the cam.
Regardless, those springs are no good and you should change them all...the question becomes what to put in. My amateur recommendation is the factory blues.
Here is what I think...someone who had that car had a friend with a Z06 and that friend did an upgrade on cam and springs. He gave his old cam and springs to his the previous owner who installed them in your car. There is really no way to know for sure without pulling the cam.
Regardless, those springs are no good and you should change them all...the question becomes what to put in. My amateur recommendation is the factory blues.
Thread Starter
Melting Slicks
Joined: Mar 2018
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From: California
[QUOTE=Speedy007;1597549724]
I did search up they do appear to be a z06 spring.. def not pulling the cam. I was on the same page as you just different book lol Putting in those yellow springs. Probably both sides. Haven’t decided whether to pull the head have it machine ported and rebuilt . Need to get a cost on that. As is maybe 10 bucks for a spring.
Thread Starter
Melting Slicks
Joined: Mar 2018
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From: California
sorry I mean cylinder 3 my bad it’s next to 1. Causing a misfire because the valve in 3 wasn’t working right.I was just so excited to find it...mind went blank !
Last edited by Speedy007; Jul 6, 2018 at 10:31 PM.
Thread Starter
Melting Slicks
Joined: Mar 2018
Posts: 2,502
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From: California
The order goes in odd numbers 1,3,5,7 in this case it was cylinder 3 spring not cylinder 1. The spring snapped I believe the 3rd coil down it looks at the top only by that picture.
Last edited by Speedy007; Jul 6, 2018 at 11:39 PM.