think another valve spring broke again

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Dec 16, 2006 | 09:14 PM

NviouSS

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From: Olathe, KS

think another valve spring broke again

i was cruising in 6th @70 mph when the ses started flashing. brought it home to pull the codes and up popped a P0300. guess it's time to throw in my prc duals.

btw, i run manley singles currently. they have ~20k miles on them.

Last edited by NviouSS; Dec 16, 2006 at 09:24 PM.

Dec 16, 2006 | 11:10 PM

99ZEOD

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Not familiar with that code. What cam are you running?

Dec 17, 2006 | 01:42 AM

NviouSS

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gt2-3. the code is a misfire code.

Dec 17, 2006 | 02:11 AM

mvvette97

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From: Leon Iowa

check you plug wires first. Is it ticking loud?

Dec 17, 2006 | 02:36 AM

eallanboggs

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Don't jump to conclusions and decide you've broken a spring. P0300 is the generic DTC for engine misfire. The PCM knows a cylinder is misfiring, but it can't figure out which one it is or you would get a more specific code like P0304 for cylinder #4. P0300 could be cause by many things. You need to go to the GM shop manual and look up the P0300 DTC and follow the precedure step by step to get to the problem. The first few steps are redundant so you can skip them most of the time and start doing the things that will help you find the real problem by process of elimination. P0300 usually pops up after you install a lopy cam that causes rough idle especially during cold starts.

Dec 17, 2006 | 01:17 PM

NviouSS

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well, i was right.

Dec 17, 2006 | 01:19 PM

mvvette97

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From: Leon Iowa

Quote:

Originally Posted by NviouSS

well, i was right.

what springs are they?

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Dec 17, 2006 | 02:27 PM

redtail2426

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From: Rochester,Ny

i wonder why they are breaking,do you wait until its fully warmed up before you romp on it??and how many of these have broke on you...if this is a second or third time i would put in some comp 918's

Dec 17, 2006 | 02:30 PM

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NviouSS

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From: Olathe, KS

my engine was at operating temp when i got to the hwy where it broke 20 min from my house. this is the 2nd time one broke. i have prc dual springs i want to put in now.

Dec 17, 2006 | 02:36 PM

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redtail2426

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From: Rochester,Ny

yeah i guess you cant go wrong with prc duals..i little much for a gt2-3 but then again its extra insurance if one breaks,which i highly doubt will happen..
seems like you got some good miles out of the manleys at least

Dec 17, 2006 | 08:26 PM

#12

NviouSS

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From: Olathe, KS

better to be safe than sorry. i was planning on putting them in when i put my f13 in.

Dec 17, 2006 | 08:42 PM

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redtail2426

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From: Rochester,Ny

nice...i only lasted 1000 miles with the gt2-3 then i put in my current cam with the ported ls6 heads,what a nice change,you will like the f-13.The gt2-3 did its job though

Dec 18, 2006 | 02:28 AM

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Rob

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From: Diamondhead, MS

That sucks. I used the LS6 springs with mine and never had a problem in over 15K miles with the GT2-3. I have the PRC's now with the new cam though

They are nice spings.

Dec 18, 2006 | 01:17 PM

#15

NviouSS

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From: Olathe, KS

i never had any problems with them until earlier this year. one snapped memorial day weekend and now this one.

Dec 18, 2006 | 02:01 PM

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Daredevil_TA

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From: Fort Lewis, WA.

Wow thats crazy for such a low duration cam, I'm glad i went with Comp 918s! Sorry about that man, I think ive heard stories of manley singles breaking on people