playtoy

Is it possible to blow a head gasket and not get any water in the oil? I made a couple of passes at the track the other night and got a "coolant temp hot XXX*" on the DIC and the coolant gauge was pegged on the low side and at the same time my wide band quit working. After that I put it on the trailer and took it home. Today I checked the oil and it is fine, no signs of water but the coolant level was low and the car is running like it has a little miss to it. Haven't pulled the plugs yet to see what they look like. Any suggestions? Motor specs :
sleeved ls2 4.125 bore
mls gaskets
mast 305cc heads
arp studs
F2 procharger 24-27#
dual nozzle meth

neverstop

could be lifting a head and eating coolant that way? bad tune on old setup was causing this to happen intermittently on my car and it was causing all sorts of weird issues.

The_Nigel

Yes. The coolant doesn't always show signs in the oil. Do a compression check to pinpoint the miss then dig into it.

badass68

Yep. It'll go into the cylinder. Yours plugs will tell the story. Cylinder with the problem will have a very clean plug.

winters97gt

Hey James, I thought that was you making a pass. Car only trapped 122 if I remember. Hope you get it fixed.

playtoy

yout should have seen my second pass. I trapped 92. The first pass the clutch stuck to the floor (never had that happen in this car before) and the second was aborted because of my wide band and coolant issues. Wasn't a good night for me. I'll get it figured out as soon as I get back from work.

schpenxel

What do plugs look like?

And did it throw any codes?

I had a weird issue on mine at one point where it would do the same thing with DIC and gauge doing that. For mine it was some weird discrepancy between the water temp sensor and intake air temp sensor. After the car has sat long enough the ECM assumes the two sensors should read basically the same thing. If they don't match within a certain number of degrees it freaks out later on (not right when you start it, for whatever retarded reason) The ECM basically didn't trust the coolant temp sensor anymore so it threw a code, turned the fans on max, disabled the AC and disabled the gauges. Mine never overheated.

I know, sounds strange.. disabled the code and that got rid of it though.

So, that's my random stab of internet knowledge at it.

Unreal

Just to add some info, yes seen cars push coolant and lose coolant from lifting heads. Under high pressure it will put some cylinder gas/pressure into system and push out coolant, but isn't so bad to mix oil/etc.

Turbo-Geist

My stock engine would leave a few drips of coolant on the garage floor after a race event. This went on for about 3 months. It never showed to have any coolant in the oil, but there were some weird deposits on one of the spark plugs. It still ran hard until the night the head gasket really let go.

SinisterC6

When do you see the highest temps?

playtoy

I haven't pulled the plugs yet, but you might be on to something. When I put my motor in last time I put my ambient temp sensor down by my blow off valves. Since ambient in Houston is F'ing HOT 365 days a year, that temp sensor means nothing to me so I figured I would use it to compare before innercooler temps and look at the iat for after innercooler temps to see if my inner cooler was up to the task. Does the ECM use the ambient sensor for other calculations in the tune.

playtoy

what would cause a car to just start lifting the heads out of no where. I've never had this issue before and have quite a few passes on this setup

in the staging lanes temps were right at 205*. I wasn't watching coolant temps after I pulled up to the line. This was just all of the sudden. I originally thought I had melted some wires or something since my wide band quit at the same time

SinisterC6

does sound like a head gasket, with coolant leaks you will see abnormally high temps at idle. Pulling plugs is the fastest way to confirm

Can be caused by knock from bad gas, aggressive tuning ect

curtisb23

I lifted both my heads .no coolant in oil or burning .only symptom was the coolant would blow out of the tank over flow after it was really hot sure enough I pulled the heads and it 7 cylinders where leaking boost

curtisb23

gotjuice?

No, only used for a/c.

Temp. gauge might be on default if there is a code stored.

LethalTT

100% this can happen. It has happened to me twice. Would fill and lose every time I drove. Did every test I could and it would come up pass. Out some $5 dye in there and blacklight showed it coming out exhaust. Second time we put air to cylinder 2 and 4 and reservoir overflowed. Neither time was there coolant in oil.

TXGS507

tune, detonation.... It can happen.

Josh@AandASuperchargers

FYI to all C6 guys.

DTC P0128 needs to be unchecked and set to No Error Reported.

I've seen this cause the XXX on the dash on many vettes and trucks, especially if you have a colder thermostat or fan settings set to come on early enough. And it can happen randomly and you will chase your tail, but only need to disable the code.

c5mtl

I say to much timing ...my heads looked like that but all my cylinders were leaking . You need to be careful cause if your blowing coolant out of the overflow it can get on your tires or on track surface and then your in big trouble or the guy after you is in trouble. 24-27 psi Is super aggressive you want to forget all this ls9 gasket stuff....call Texas speed and ask about their fire ring gaskets.....expensive but the seal even under the most insane setups ....guys on yellow bullet are putting 45psi through them on 4 bolt heads ....do it once and be done with it!!!

http://www.texas-speed.com/p-5047-pf...re-single.aspx