Shudder while ideling
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From: Machineguns, because I don’t compromise
Thread Starter
Racer
Joined: May 2011
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Well unfortunalty it's mine and I'm not quite as awesome as you are. I'm trying to diagnose the problem the best way I can.
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From: Machineguns, because I don’t compromise
The fact it happens (symptoms) especially low load/rpm dictates the potential causes mentioned. Most likely ignition but higher rpm pressure can control a valve more against the seat compared to a spring at low rpm letting it bounce.
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From: Machineguns, because I don’t compromise
The same way a weak ignition at low rpm (mainly the wire or plug) is reminded by higher rpm. Doubtful it's an igintion coil based on symptoms, those break up under load which isn't the case here.
If I had to bet, I'd vote ignition wire, then spark plug (not really) then valve spring, then coil.
Let us know what I was.
If I had to bet, I'd vote ignition wire, then spark plug (not really) then valve spring, then coil.
Let us know what I was.
Thread Starter
Racer
Joined: May 2011
Posts: 346
Likes: 3
The same way a weak ignition at low rpm (mainly the wire or plug) is reminded by higher rpm. Doubtful it's an igintion coil based on symptoms, those break up under load which isn't the case here.
If I had to bet, I'd vote ignition wire, then spark plug (not really) then valve spring, then coil.
Let us know what I was.
If I had to bet, I'd vote ignition wire, then spark plug (not really) then valve spring, then coil.
Let us know what I was.
Racer
Joined: Jul 2003
Posts: 333
Likes: 31
From: PA
Just in case you ever need the info- there is a Corvette specialty shop here in Erie: Harborvette. I don't know anything about them except that they have been around for quite a long time.
EDIT: found their website http://harborvette.com/
EDIT: found their website http://harborvette.com/
Last edited by joezr2; Oct 2, 2017 at 12:44 PM. Reason: alien probe
Race Director
Joined: Sep 2004
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
you said you had fuel injection cleaner in it correct? maybe its working and loosening up crude....i would drive all of that out of the system before anything else.
Le Mans Master
Joined: Sep 2013
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From: Wisconsin
He asked for other reasons his car could be idling rough. There are a lot of them besides ignition misfire or valve springs. Been there.
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Thread Starter
Racer
Joined: May 2011
Posts: 346
Likes: 3
Didn't get to the plugs and wires today, I'll get to them tomorrow and update the thread accordingly.
Thanks for all the replies I'm a novice with computer controlled cars. If push came to shove would taking it to the stealer and letting them hook it up to their diagnostic machinery be able to pin point it easier?
Thanks for all the replies I'm a novice with computer controlled cars. If push came to shove would taking it to the stealer and letting them hook it up to their diagnostic machinery be able to pin point it easier?
Thread Starter
Racer
Joined: May 2011
Posts: 346
Likes: 3
So driving it over my buddies house to change the plugs and wires and CEL finally came on. Code came up p0300 multiple cylinder misfires. The misfire is now noticble across all rpm ranges.
So waiting for it to cool and gonna swap the plugs and wires
So waiting for it to cool and gonna swap the plugs and wires
Thread Starter
Racer
Joined: May 2011
Posts: 346
Likes: 3
So we got it alll done the spark plug wires were completely dry rotted and pulled apart in my hands. The number 5 was by far the worst. The spark plug were mismatched it had 3 AC Delco and 5 Denso's. Once we swapped the plugs and wires it fired right up, CEL cleared and it was purring like a kitten.
Thabks for all the help gents
Thabks for all the help gents
Le Mans Master
Joined: Nov 2006
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From: enterprise al
St. Jude Donor '08
Just saw your most recent post after I posted.. glad ya got her fixed up.. I figured that would do it
Last edited by OleStraightStick; Oct 3, 2017 at 10:28 PM.