Ok, I'm running a SOHC ZC motor. I have good compressions across all pistons at 135psi and holding a piece. I have checked the timing and it is correct. I have checked the fuel pressure and it is ok. I haven't been able to figure out how to lean the fuel out though, but anyway, it starts up and runs pretty good EXCEPT it smokes like a chimney at all RPM's. I have replaced the cap, rotor, plugs and wires, and after I run it, the plugs are blackened and need to be cleaned. Has anyone had this problem and knopw how to solve it? I really would like to NOT buy a new motor. I have also replaced the O2 sensor and the fuel regulator that is connected to the end of the fuel rail that seemes to be controlled by vacuum.

 

It looks like your burning water and oil mixture from your head. causing the smoke to bellow out of your tail pipe.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spluvs2install &raquo;</TD></TR><TR><TD CLASS="quote">Ok, I'm running a SOHC ZC motor. I have good compressions across all pistons at 135psi and holding a piece. I have checked the timing and it is correct. I have checked the fuel pressure and it is ok. I haven't been able to figure out how to lean the fuel out though, but anyway, it starts up and runs pretty good EXCEPT it smokes like a chimney at all RPM's. I have replaced the cap, rotor, plugs and wires, and after I run it, the plugs are blackened and need to be cleaned. Has anyone had this problem and knopw how to solve it? I really would like to NOT buy a new motor. I have also replaced the O2 sensor and the fuel regulator that is connected to the end of the fuel rail that seemes to be controlled by vacuum. </TD></TR></TABLE>
Answering these questions may help:

- What color is the smoke (blue, black, white)?
- Does the smoke have a certain smell to it (oily smell, rich mixture smell, sweet smell)?
- Are the plugs oily, or just dirty with dry carbon?
- Are you getting any black soot or oily residue on your rear bumper?
- Are you losing coolant?
- Have you checked your oil level recently (with the car parked on a level surface)?
- Have you been keeping track of any oil consumption?
- What is your average fuel economy like?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lewy &raquo;</TD></TR><TR><TD CLASS="quote">It looks like your burning water and oil mixture from your head. causing the smoke to bellow out of your tail pipe.</TD></TR></TABLE>
probably just blown head gasket..

 

135 psi is very low actually. Should be closer to 180.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VegaS10 &raquo;</TD></TR><TR><TD CLASS="quote">135 psi is very low actually. Should be closer to 180.</TD></TR></TABLE>
true - nominal compression is 185 and minimum is 135 - sounds like rings are gone and it needs rebuilt

 

to answer some questions. At first, not all cylinders were firing but now that they are, the smoke is black and grey and yes, it leaves a kind of black soot on the rear bumper. When taking out the plugs now, they aren't wet for say but they are definitly blacked by a soot in the cylinder which is easy to wipe off by finger and if you stick a screwdriver down to the piston, and scrap, you will get a small bit of black carbon i would say. I just did an oil change on it and even still, the oil looks like sh-t again. It isn't losing coolant as I can see or tell by any means. The computer is a Pm6.

 

Oh, when its running it will fill the entire garage up with a heavy fog smoke. It will burn your eyes and smells like a gas station, which would indicate the car is running real rich. ya'll have any ideas or do you think the engine is pretty much f-ed?

 

compression of 135?
as somebody already mentioned, it should be closer to 180-190.
Maybe do a leakdown test to see if you have bad valve seals, piston rings or headgasket

 

Check your valve seals. Also go and get some seafoam and run that through the motor. It should help a lot in cleaning up any crap that is in there. It will smoke insanely for a while with the seafoam in the engine but should make it a lot better. If that fails try 'No Smoke' its essentially the same thing. It should clean up your engine.

As other shave stated 135 is pretty low compression. Check your valve seals and head gasket. You should do it now before anything serious happens. Having your motor apart for a weekend is better than having a blown motor for life.

CRX Forum

 

i think it a sohc zc it should be like 200psi... it my d15b1 that had lots of nitrous ran threw it had 180 180 160 190

 

How does it run? I would check the map sensor vacuum and electrical connections

 

135 psi is too low.

Even if you run Seafoam and other additives, it's not going to fix low compression (for long anyways). It's toast man, seriously. Rip the head off, drop it off at a machine shop and put a new headgasket on it.

Or just get another engine.

 

I did a compression test on it again and held it for 5 minutes and it never dropped. I also did a head gasket leak down test with blue dye from snap on and it passed. The one you sniff the coolant. I also swapped out the distributor but no difference. I plan to get another brand new ngk cap and rotor tomorrow and see if the sh-t thats on there maybe isn't giving it enough spark. The coolant is still perfectly green with no bubbles. The vehicle is getting plenty of gas and when it first starts up, it idles very rough untill it runs for a minute or so. I plan to run it for like an hour and see if anything channges tomorrow. Does anyone know where I can go from here? It just boggles the **** outta me that the head gasket leak tester came out positive, as I thought that might be the issue. I also thought about sticking some oil in the plugs and seeing if the compressions goes up a ton, maybe one of the 3 piston rings have gone bad or the oil seal on the rings, but I'd rather not tear it down if in fact its something stupid and simple or just plain stupid. any ideas????????????????????????????????????????????? ????????????

 

Has it ever run properly?Or is this a new swap you're putting in?

 

it ran when I bought the car but when it was running, it didnt smoke too badly at firsdt but once I did the deal and got it on open road is when it really started to smoke and then I had it out front of my house for a while starting it occasionally, but each time I'd start it, it would blow more smoke out. If i had known it was going to do that at the time I bought it, (it was at night) I wouldn't have bought the car. So hopefully that answers the question

 

another mechanic friend I know said I should check the manifold absolute pressure sensor. I dont have a mas air sensor and I'm not completely sure where the map sensor is but I could find it if needed. ALSO, were can I check or how can I check for pressure in the fuel and wether or not the injectors are firing correctly?

 

anyone have more ideas or should this engine run fine with all therse indications that I have mentioned??

 

i have the same motor... but mine only smokes when i floor it... any suggestion?

 

well first of all if your on acceeration and black/blue smoke its the rings if your having smoke only only deceleration (high vacuum)its the valve seals. some black smoke on high rpm is normal rich fuel mixture. Looks like a new re ring and seals just to play it safe. so a new haedgasket will be done in the process anyway(even though the smoke isnt white)

 

there are no tune up items or sensors or anything in your ignition or fuel system that will cause your motor to smoke like you are describing. it sounds like your are burning a ton of oil to me, its not gonna be fuel because if your car was running so rich that you could see smoke pouring out of it at idle then it would'nt even be running, it'd never start it'd be so flooded out. your rings or valve seals are probrably toast, stop throwing tune up parts at it, your wasting your money.

 

what I bought so far was an O2 sensor, which I can return. I bought a cap, rotor, plugs, and wires just to get it done and out of the way. I replaced the distributor and even though I was getting spark, i redid it anyway and checked for spark and got spark again, on each wire, on each plug, to each cylinder, the only thing i haven't been able to see is wether its sparking inside the engine, duh, LOL. I have checked the timing 4 times, I redid the timing belt and set the timing marks as perfect as you could imagine, as I took my sweet ole time to make absolutely sure they were EXACT. I did the compression and it was at 135psi, I cleaned the intake and the throttle body completely. I checked the EAVC on the back of the intake and have plugged all vacuums on anything that wasn't nessesary, which I checked and checked again. Now, it just cranks like I said, it doesn't even want to kick over. I haven't replaced the fuel filter or made sure it had a completely full to the top gas tank. BUT i know it gets gas. This is why it is soo fustrating!! ????????????????????????????????????????? I want to see if this will freshen up minds

 

IF the rings are completely gone on this car, will it have little or not compression in all cylinders?

 

135 = little compression

 

right but 135psi is still compression, even if its not much, its still something, but is that something enough for the vehicle to start