shm91

I have a week old post which has 17 posts in it. I thought it was too long to read all.

Long story short,

Could bad intake manifold gasket cause coolant loss & misfire in a cylinder?

Car was running comparatively fine with little coolant loss and little white smoke. But when I changed out the head gasket few weeks ago myself, the tail pipe blew white non-sweet steam through tail pipe, and threw cylinder 3 misfire code.

I milled the head, and followed every torque and procedure accordingly over a long time - several weeks - double checking with my own note.

The only thing I neglected was the intake manifold gasket, and it was green, but I couldn't get it off. It was like stone. But the surfaces seemed to seal. Only broken at the outer edges. Anyway, it might not be sealing. I read somewhere that bad intake gasket could leak coolant into a cylinder causing misfire.

I have 2000 Honda Civic. Is the theory likely with my Honda brand vehicle?

I want you to assume compressions are within spec, no vacuum leak, and plugs (any electrical parts) are okay.

If the answer is no, do you suggest any reason for my problem?

pityocamptes

Are you throwing any CELs?

shm91

Yes. Single code, Cylinder 3 misfire - 73

pityocamptes

Have you tried spraying carb cleaner in the manifold area to see if it changes idle (vac leak)? Are you losing cooling fluid? What does the plug look like for cylinder three?

shm91

Bad green-colored intake gasket was replaced with a Felpro one.
The intake manifold has coolant inside [pic] - I neglected it, thinking after start, the car will eliminate it (kinda thinking I did wrong).


I started the car. It fumed white smoke furiously, I was waiting for it to dwindle down with the leftover coolant to be consumed, since I thought I solved the problem.

I stopped the car once after twenty seconds to check the hood. Then, the car died down right away as it was turned on. Ten more times and the same result. It's 31 F degrees now.

Compression is 185 185 171 183

Will try tomorrow again. Any ideas?

shm91

there was coolant leaking into the cylinders. The head gasket was replaced.

The white smoke was not seen through the tailpipe this time. It was only from the middle of the resonator pipe.

The resonator has been clogged long time. I saw coolant leaking in the middle of the resonator pipe, when the car died. Is this related to the start-die problem?

P.S. I dried out the plugs with a rag before this. Turned over for a minute without the plugs inside.

schollianmj

do you still have coolant in the intake? its not a good idea to run a car like that. pop the TB off again lik in your pic and see if its still there. if so use a rag or what not to get it out. Not sure how it would get in there, seems like a HG would not do that as the valves would be in the way, but you never know...

TheLukeMartinez

Does it still die if you give it gas?

Former User

Only 1 thread per topic is allowed. Related threads merged.

95Sedan

did you clean the plugs and all that? Make sure there's no coolant currently getting into the cylinder?

shm91

TheLukeMartinez: It didn't die. Yet I had to shut off, I got surrounded by the gigantic and thick white smoke after just a minute.

95Sedan: I did. I hope so. But I had to pour at the end about 12 ounce of coolant again. It was full before start, and was not reached to the operating temp either.

shm91

I wanted to see if the cause of coolant leak is intake itself. I wiped the coolant inside the intake. Then, installed the TB. Operated the engine for 10 seconds. I opened up the TB. The coolant was full inside the intake again. The TB gasket was wet itself. I think it's key factor for the coolant loss. Isn't coolant not supposed to be inside the intake except only the air?

NotARaCist

iTrader: (1)

It sounds like you may have either a damaged intake manifold gasket, or a coolant line plumbed in where a vacuum line should be. Look over all of your hoses under the hood and make sure they're installed where they belong. If you're not sure, post some clear pictures.

dfanatic86

hmm did you cross your fitv lines?

shm91

shm91

dfanatic86: I didn't know what it was, but found this.

shm91

Update: other than the possibility of TB leaking coolant, I remembered the IAC gasket was stretched but I forced it into the grooves and reassembled it. If IAC is leaking, would that small part's gap cause that much (refill of coolant inside the intake - like the first pic of this topic - after just ten seconds of engine operation) of coolant leak into the intake? I'm thinking about cooling system pressure test.

Found a person who had the exact same problem last year. The IAC gasket was the problem for the person. Will call the dealer for the gasket tomorrow morning!
http://www.d-series.org/forums/gener...one-wrong.html

pityocamptes

I would also change your oil and filter, once you get the gasket corrected.

shm91

The IACV seal was broken, and was changed out. The car was started, and fumed white smoke again, losing coolant. There was no coolant inside the intake any more. But, milky fluid was found in the new oil. Again, compression is fine: 185 185 171 185.
p.s. The RPM became fine to around 1600 at cold start - 30-32 F weather.

shm91

bump

95Sedan

milky oil thought was always a bad head gasket?

NotARaCist

iTrader: (1)

Or OP had coolant sitting on top of his pistons that leaked past the rings while it was sitting, contaminating the oil. Now that you've replaced that gasket, do an oil change with some cheap stuff, do a block test, run it for 10 minutes, then check your oil again.

shm91

Okay.

I'm still wondering why there was strong white smoke for the twenty seconds after cold start, since it means coolant is burning with gas.
Block test seems reasonable, since about THRITY SECONDS is enough. I'll post cooling system pressure test result, too.

I drained the coolant - except unbolting the drain bolt - and put new about half gallon. D16Y7 needs about one gallon for replacement. So, there should be a moment I go past one gallon during bleeding if it's burning coolant. But, I'm just scared to bleed it for MINUTES, since hydrolock could occur.

shm91

So, to summarize all the above my posts:

*Symptom*:
I'm having coolant steam through tailpipe. I also have coolant in the oil - milky oil.

Currently:
Head gasket was changed out with new head bolts. Head was milled. Compression is fine with 185 185 171 185.
There's no misfire. No CEL. RPM steady at 1600 through cold start at 32 F outside temp.

Recently:
So, I was having intake gasket and IACV leak. All fixed, now. So, there maybe residue coolant in the cylinders and past the rings. But I changed out the oil and the coolant, but I'm having the above *symptom* again.

B_Swapped93

flush the coolant and oil once more 2nd a little water dripping out of the exhaust is fine.