Nissan Terrano Z24

I have a Nissan terrano of 92, gasoline, Z24 motor, at the start I do not match the engine, I have taken several mechanics and have not found the problem with the electro, starts and when circulating begins to pull the spark plugs, platinos, condenser, spark plug cables, the carburetor checked. He pulls a negor smoke through the escape system, the spark plugs leaves them black. What could be the problem?

Therefore, you say the black spark plugs is a fuel excess, what you would have to check to start is to measure the compression of the cylinders, since being irregular it may be one of the cylinders that does not work, check that first and then we focus on what problem that problem has that Czech cylinder and letharks. In general, I recommend that you review the water level if you fall and do not save where it is, you may have problems with the cylinder head or the cylinder head itself since those trucks have the cylinder heads.

First of course for the contribution, send the compression to check and they told me that it was fine, the only thing that the fourth spark plug was soaked in oil and with a carbon scab, they changed it, and so far it has matched, I do not see that it consumes water, the only thing that if I notice is that the temperature rises more than it did before.