I may have broken valve springs... Help please
06-28-2007, 09:51 PM
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I may have broken valve springs... Help please Symptoms...
Normal driving from a stand still...
Car goes lean.
Chugs air in and bucks like the cam has an insanely large lope.
Rattling sound coming from the passenger side of the car.
Car stalls constantly, even though the tune is exactly the same.
Last time I went WOT it went rich. So rich that my a/f gauge couldnt give me a reading.
The first time it happened the service engine light started flashing, but when I ran the codes nothing was there. My a/f is all over the place, and I just replaced my o2 sensors thinking maybe the race gas messed them up. Changing the o2 sensors, and checking the tune didnt do anything.
I'm wondering if I may be another valve spring victim. Is this how a car acts when a spring breaks and drops the valve? I have the comp cams valve train upgrade kit that included ls1 high performance valve springs (#26918).
Normal driving from a stand still...
Car goes lean.
Chugs air in and bucks like the cam has an insanely large lope.
Rattling sound coming from the passenger side of the car.
Car stalls constantly, even though the tune is exactly the same.
Last time I went WOT it went rich. So rich that my a/f gauge couldnt give me a reading.
The first time it happened the service engine light started flashing, but when I ran the codes nothing was there. My a/f is all over the place, and I just replaced my o2 sensors thinking maybe the race gas messed them up. Changing the o2 sensors, and checking the tune didnt do anything.
I'm wondering if I may be another valve spring victim. Is this how a car acts when a spring breaks and drops the valve? I have the comp cams valve train upgrade kit that included ls1 high performance valve springs (#26918).
06-28-2007, 10:01 PM
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If the valve spring broke, the valve would drop and the piston would be hitting it...
you would also have misfires because the valves wouldn't be closed for the compression stroke.... Valves would be bent and pistons would have damage.
Very loud metallic sound... And you would hear it anytime the engine is running.
you would also have misfires because the valves wouldn't be closed for the compression stroke.... Valves would be bent and pistons would have damage.
Very loud metallic sound... And you would hear it anytime the engine is running.
06-28-2007, 10:13 PM
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It was throwing off misfire codes a few weeks back. My tuner couldnt pinpoint why, but thought it had something to do with the a/f o2 sensor issue. For the service engine light to be flashing it had to throw off some kind of code.... why would it clear the codes out by itself???
06-28-2007, 10:15 PM
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Originally Posted by Slo-Mo-Shun
If the valve spring broke, the valve would drop and the piston would be hitting it...
you would also have misfires because the valves wouldn't be closed for the compression stroke.... Valves would be bent and pistons would have damage.
Very loud metallic sound... And you would hear it anytime the engine is running.
you would also have misfires because the valves wouldn't be closed for the compression stroke.... Valves would be bent and pistons would have damage.
Very loud metallic sound... And you would hear it anytime the engine is running.
Edit: Bingo!!
I spent an hour searching, then I find this right after I start a new thread
Originally Posted by MOBE
At idle it will most likely sound fine. When you drive it "normally" it will sound like you have an exhaust leak ("tick") and will sputter and hesitate. If you floor it it will backfire and sould horrible.
This is all of course, if it is an exhaust valve. I had to change one last weekend. Never had a broken intake valve though.
This is all of course, if it is an exhaust valve. I had to change one last weekend. Never had a broken intake valve though.
Last edited by xxtheonlyxx; 06-28-2007 at 10:30 PM.
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08-21-2007, 03:22 AM
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2 bad spark plug wires, 1 bad spark plug, and bad O2 sensors cause the car to act the way it did...... Updated just in case someone searches and finds this later.
