C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Need help!

Old Apr 14, 2010 | 03:34 PM
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So, I thought i fixed the problem with my engine clicking by putting oil in it (because i found out it was out of oil) and everything seemed to work right until i got on the interstate this morning and the faster i went the clicking started again, and the faster i went the faster the clicking was.

And it would almost stall at out if i was going too slow in 1st, like there wasn't enough drive to auto propel the car when the clutch is engaged. So on my way home from school i pulled onto my street into my neighborhood and the car just died, plenty of gas, the battery was fine... so im clueless to what happened. any suggestions?
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Old Apr 14, 2010 | 03:41 PM
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How was the oil pressure?
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Old Apr 14, 2010 | 04:09 PM
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the oil pressure was fine, it ran around 40 psi, and dropped to 25 on occasion when idling
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Old Apr 14, 2010 | 04:31 PM
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Start with basics......

1) Any codes?
2) Pull spark plug and test for spark.
3) Test for fuel at the rail.
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Old Apr 14, 2010 | 06:57 PM
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if i pull the spark plug, how do i test for sparks?
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Old Apr 14, 2010 | 09:12 PM
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well my car is screwed, and probably won't be driving it for a while, we solved the problem for it not starting (needed more gas), but the tapping from the engine persists, put oil in it, still goes on... so we figured its a damaged valve/ valve spring... unless there is a cheaper way to fix it, it's going to be way out of budget to fix
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Old Apr 14, 2010 | 09:26 PM
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bad valve spring is easy to fix.
Do a search for "rope" - you'll find a way to hold the valve up.
Then a simple spring compressor tool, bet a couple of good size screwdrivers could be used. Slap a spring in, adjust the valve and voila.
If you are going to pull the heads for a full valve job it can be done in less than 4 hours.
About the same time to put them back on.

Now if the sound is lower like a rod knock its rebuild time.
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Old Apr 14, 2010 | 09:29 PM
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Yea it's an upper sound, and i'll have to try that

but also my oil is disappearing, and there's no obvious leak
i put 3 quarts in last night to temp fix the problem (which didnt fix it at all) but later today i checked the oil and it needed to be filled, so i read up that overheating can cause a crack to form and it can leak into the cooling system (which might be why my coolant is turning brown)
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Old Apr 14, 2010 | 10:04 PM
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Put a screwdriver to the valve covers and try and isolate the sound. For most of last summer I was following a loud ticking that increased with speed. Turns out my header bolts were loose causing a small leak. I tightened them up and the sound went away.
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Old Apr 14, 2010 | 10:13 PM
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if you're using oil I highly doubt the tapping is an exhaust leak...you have problems...big time.
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Old Apr 14, 2010 | 10:38 PM
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i'm not very engine handy, so to get to the valves i remove the cover, then the crossfire?
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Old Apr 14, 2010 | 11:43 PM
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Originally Posted by indyvette55
Yea it's an upper sound, and i'll have to try that

but also my oil is disappearing, and there's no obvious leak
i put 3 quarts in last night to temp fix the problem (which didnt fix it at all) but later today i checked the oil and it needed to be filled, so i read up that overheating can cause a crack to form and it can leak into the cooling system (which might be why my coolant is turning brown)
the coolant will turn brown from rust in the block but if you oil is turning milky then u have big problems!!!! U should always check your oil when u fill with gas and then u will never have these problems
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Old Apr 14, 2010 | 11:51 PM
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Originally Posted by HONDOBUCK
the coolant will turn brown from rust in the block but if you oil is turning milky then u have big problems!!!! U should always check your oil when u fill with gas and then u will never have these problems
yea it rusts because air is getting into the system, and im not sure how that would happen unless there is a crack somewhere
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Old Apr 15, 2010 | 09:20 AM
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Originally Posted by indyvette55
yea it rusts because air is getting into the system, and im not sure how that would happen unless there is a crack somewhere
Intake gasket?????????????
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Old Apr 15, 2010 | 09:24 AM
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Always figure out how your new car uses fluids and stick to that schedule. I discovered my car uses a qt of oil every 500 miles so I check it that often, basically every fill up. My oil usage is related to valve seals. No outside oil leaks but sooting up the rear bumper. The only time anything is noticeable is when you get on it and when you check the dipstick.

Mine doesnt make any noise and runs great. Since I use it for mostly road trips, I keep an eye on the odometer and add oil accordingly. At highway, my car gets pretty much 400-450 miles per tank so it works out pretty good.
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Old Apr 15, 2010 | 10:29 AM
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Find a mechanic, tell him you only need diagnosis, pay him. Talk to local machine shop guy, tell him the same thing, pay him $20 for just listening.
You cannot make right decision w/o complete info.
Yesterday I replaced exhaust gasket and manifold was welded.
Before I did that 2 dealer mechanics and 2 engine mechanics were listening that unusual sound. I even posted "sound" thread here.
Good luck!
Make a video, post it to Youtube, post link here.

Last edited by car5car; Apr 15, 2010 at 10:31 AM.
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Old Apr 15, 2010 | 06:04 PM
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we'll end having to do that, we know a guy in Tampa who owns a vette shop, and there's a place near by...

and i'll make a video soon so you all can know whats going on with it lol
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Old Apr 17, 2010 | 02:48 AM
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Originally Posted by indyvette55
Yea it's an upper sound, and i'll have to try that

but also my oil is disappearing, and there's no obvious leak
i put 3 quarts in last night to temp fix the problem (which didnt fix it at all) but later today i checked the oil and it needed to be filled, so i read up that overheating can cause a crack to form and it can leak into the cooling system (which might be why my coolant is turning brown)
on you for not checking oil or any fluid level often.So far what you've said don't sound good.You could switch to a thicker oil & use Lucas oil additive in the meantime but,if oil is being introduced to the cooling system it can cause blockages(heatercore,coolant block passages,etc) & all cooling system hoses will have to be replaced after problem is fixed($$$$$).Check spark plugs for oil burning to pinpoint what cylinder(s) are affected.Also do a compression test while plugs are out to also see what cylinder(s) are affected.Disconnect each fuel injector one by one to see if noise "lessens".This will also pinpoint the affected cylinder(s).If oil IS mixing with the coolant you may have bad intake gasket,head gasket,warped or cracked head,or if you have a oil cooler that goes into radiator-the radiator could be cracked internally allowing the oil to mix with coolant.Its also possible that wear was created in the rockers & they need to be adjusted & the valve seals could be causing you oil consumption problem.Good luck & keep us posted
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Old Apr 17, 2010 | 03:02 AM
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After the engine "ran out of oil" you should run the engine for a few miles then dump that oil and replace with a new filter. Repeat in 500-1000 miles.

Also it cannot hurt to add some Seafoam or Marvel Mystery Oil the to oil to help remove any varnish buildup especially on the lifters. This can reduce or eliminate the tapping noise.

A bad set of rings will consume a quart of oil in less than 1000 miles or less. But to use over a quart in a few days is not good. When you open the radiator can you smell oil in there? If so, not good.

It sounds like this car has either set for a long time or not been properly cared for by the PO. You should really start a comprehensive maintenance interval that includes all the filters, fluids and part replacement.

Not cheap but you'll have a better starting point than where you're at now.

BTW taking your Vette to a "Vette Shop" will most likely result in some major expenses. Ask around here for some help on performing some of the simple tasks to avoid paying through the nose.
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Old Apr 17, 2010 | 08:54 AM
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Thanks guys, we talked to somebody recently and he said something about the lifters (best case scenario possibility) needing to be lubricated, would this be a cause as well?
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