Have you ever hit 8900+RPM before? I did and....
05-04-2004, 05:00 PM
#41
I had a 03 CL Type S come in after 3 other dealers have missdiagnossed it, car idled very rough and the power was still somewhat there but at idle U could tell it was not fireing right. The other tech who worked on it before me did a compression test, and put a new 02 sensor on it and new Map sensor ( don't ask me why !!! ) Well I looked at the car, it had 19s on it, lowered, 6spd tranny, and young kid driving it. It was over reved - kid admitted to it, he paid for labor to fix his heads- floated some valves and bent them. Acura picked up the tab on the parts. Leak down test showed that the valves have been bent.
05-04-2004, 05:03 PM
#42
Possibly yes, but if its off compression can be off as well cause it could be left open.
To check that I need to pull the entire timing cover and that aint easy or fun, might as well pull the engine for that.
Dixit
To check that I need to pull the entire timing cover and that aint easy or fun, might as well pull the engine for that.
Dixit
05-04-2004, 05:10 PM
#43
U would be supprised what U can find on DOHC engines once the timing skips, compression could stay the same. What did U get for compression anyways ? I skimmed through this whole tread today not too long ago and I don't recall the #s. Did U do a wet test too ? I seen a few really cheap 1st gen VQs - non K motors for sale on Ebay really cheap. Transfer the lower intake and upper over, basically convert a non K motor into a K motor. I got a overheated VQ35 layn around- accident car, they left the engien runing after they hit a deer. I am not too sure if there is anything left of that engine maybe just a crankshaft.... gonna have to pop that sucka open one day.
05-04-2004, 05:16 PM
#44
Im doing about 200 in eacy cylinder, mainly because it ran very rich due to the charge pipe being blown off while I drove it home. That was the compression the day before I did this to the engine and after its still the same. No change.
My main goal is to get the engine started now with no tranny and see how it reacts.
Dixit
My main goal is to get the engine started now with no tranny and see how it reacts.
Dixit
05-04-2004, 05:39 PM
#45
Senior Member
Join Date: Nov 2002
Posts: 905
Correct me if i'm wrong but isn't a leak down were you take the valve cover off and shot compressed air into the cylinder at the spark plug entry with the engine turned to where all the vavles should be completely sealed, and listen for air escaping the cylinder? It isn't hard to do that at all.
If i am wrong then what is the process i just described called?
If i am wrong then what is the process i just described called?
05-05-2004, 06:10 AM
#46
Newbie - Just Registered
Join Date: Mar 2004
Posts: 4
Originally Posted by BigDogJonx
Was racing bags533 on the way home and we took off in 2nd and I shifted into 3rd, and misshifted into 2nd and the tach went to the floor. Emanage tells me I did 8910 rpm on the peak.
Now the bad news, the car doesnt idle too well. It shakes pretty vigourously while in my garage. When I rev it it feels fine but when it gets to idle it shakes. The vacuum is fine. No codes besides my missing tranny code.
Now when I came to a light I couldnt even get it into gear, i had to jam it into gear. Got a feeling maybe the engine is vibrating like crap cause of some in the clutch/plate combo has issues and threw it off balance.
So just did a compression test and everything there is perfect. Every cylinder coming in at 190-195 (mainly due to carbon buildup from running rich when a charge pipe blew off) Next is to probably drop the tranny to see if there is something wrong with the clutch setup. If not I was going to figure out a way to rig the starter to the block so I can start it with no tranny and see if the car runs fine.
Dixit
05-05-2004, 07:24 AM
#47
To replace just the heads requires me to remove front and rear timing covers and then remove the heads. I might as well at that point pull the engine as it would be easier to do.
My question is bent valves cause vibration? I didnt think they would. This clearly feeling like when the engine is running that the balance on the crankshaft is off. Just like if you were to spin a wheel and the balance is horribly off. That is exactly what Im experiencing. Not a knocking noise or anthing out of the ordinary.
Dixit
My question is bent valves cause vibration? I didnt think they would. This clearly feeling like when the engine is running that the balance on the crankshaft is off. Just like if you were to spin a wheel and the balance is horribly off. That is exactly what Im experiencing. Not a knocking noise or anthing out of the ordinary.
Dixit
05-05-2004, 08:48 AM
#48
Pretty close...but you don't remove the valve cover.
You put the engine at TDC on the compression stroke, screw the leakdown tester into the sparkplug hole like a compression tester, and then use compressed air to put X-psi into the cylinder while watching the leakdown tester to see how much psi you're loosing.
Or something along those lines.
You put the engine at TDC on the compression stroke, screw the leakdown tester into the sparkplug hole like a compression tester, and then use compressed air to put X-psi into the cylinder while watching the leakdown tester to see how much psi you're loosing.
Or something along those lines.
Originally Posted by tampamax
Correct me if i'm wrong but isn't a leak down were you take the valve cover off and shot compressed air into the cylinder at the spark plug entry with the engine turned to where all the vavles should be completely sealed, and listen for air escaping the cylinder? It isn't hard to do that at all.
If i am wrong then what is the process i just described called?
If i am wrong then what is the process i just described called?
05-05-2004, 08:54 AM
#49
Originally Posted by BigDogJonx
To replace just the heads requires me to remove front and rear timing covers and then remove the heads. I might as well at that point pull the engine as it would be easier to do.
My question is bent valves cause vibration? I didnt think they would. This clearly feeling like when the engine is running that the balance on the crankshaft is off. Just like if you were to spin a wheel and the balance is horribly off. That is exactly what Im experiencing. Not a knocking noise or anthing out of the ordinary.
Dixit
My question is bent valves cause vibration? I didnt think they would. This clearly feeling like when the engine is running that the balance on the crankshaft is off. Just like if you were to spin a wheel and the balance is horribly off. That is exactly what Im experiencing. Not a knocking noise or anthing out of the ordinary.
Dixit
Another possibility is stretched connecting rod cap bolts, but that would also result in a knocking noise. Maybe a rod itself stretched, throwing the assembly out of balance?
05-06-2004, 05:12 AM
#52
Newbie - Just Registered
Join Date: Mar 2004
Posts: 4
Originally Posted by BigDogJonx
To replace just the heads requires me to remove front and rear timing covers and then remove the heads. I might as well at that point pull the engine as it would be easier to do.
My question is bent valves cause vibration? I didnt think they would. This clearly feeling like when the engine is running that the balance on the crankshaft is off. Just like if you were to spin a wheel and the balance is horribly off. That is exactly what Im experiencing. Not a knocking noise or anthing out of the ordinary.
Dixit
My question is bent valves cause vibration? I didnt think they would. This clearly feeling like when the engine is running that the balance on the crankshaft is off. Just like if you were to spin a wheel and the balance is horribly off. That is exactly what Im experiencing. Not a knocking noise or anthing out of the ordinary.
Dixit
you are not starving for oil or have lose valves .I gest replaseing the motor would be better the cost for you engen is not that much .but F.Y.I you have bent valves .Good Luck
05-06-2004, 01:01 PM
#54
Originally Posted by BigDogJonx
To replace just the heads requires me to remove front and rear timing covers and then remove the heads. I might as well at that point pull the engine as it would be easier to do.
My question is bent valves cause vibration? I didnt think they would. This clearly feeling like when the engine is running that the balance on the crankshaft is off. Just like if you were to spin a wheel and the balance is horribly off. That is exactly what Im experiencing. Not a knocking noise or anthing out of the ordinary.
Dixit
My question is bent valves cause vibration? I didnt think they would. This clearly feeling like when the engine is running that the balance on the crankshaft is off. Just like if you were to spin a wheel and the balance is horribly off. That is exactly what Im experiencing. Not a knocking noise or anthing out of the ordinary.
Dixit
I have a VQ30DE out of a 99 if you need/want it. it has about 40,000 miles on it. let me know.
Jake
05-06-2004, 08:05 PM
#55
Dixit... I did the same thing at the track a few months back... Went to 2nd instead of 4th from the top of 3rd... I also hit about 9,000rpms... My car still run's fine though, although it ticks a little louder than it used to, but since I've run my 13.2 @ 110... so the car is still strong...
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