Please HElp 300zx fuel

[nathanmoris]

I know what smoke out of the tail pipe means that there is a coolant leak of some sort somewhere but my question is why does the smoke coming out of the tail pipe smell really really rich of gas and one of the spark plug that i pulled out was soaked in gas still.... does this have anything to do with the smoke or is it still coolant and what do i need to llook for the richness of fuel thanks jonathan

[onelessissue]

ok heres is a few things to ask yourself what color is the smoke white or black maybe brown or just steam and dose it smell sweet or smell like gas? white sweet smelling smoke would normaly be coolant black could be fuel or oil do you ahve access to a scan tool to look at your long term fuel trim ? you would normaly wanna see around 100% and more is lean and less is rich

[dantheduke1]

Have you checked your injectors. One maybe stuck open, flooding the chamber. Mine was caused by dirt getting by my fuel filter. What color is the smoke?

[nathanmoris]

the smoke is white but smells like heavy fuel ..... i will check on the injectors but i just got them from kragen but things are defected in this world .. thanks for any help jonathan

[Wetmyson]

haha it's interesting reading the threads posted here because EVERYONE complains about the smell of gas. mine still smells like gas. i know they run rich because they have forced induction, but geez! i don't know if i have a gas leak yet - actually i think i have an exhaust leak. i'm going to check that / fix it and then see what i smell.

and as for how does coolant get in the exhaust - sometimes some will seep through a little head gasket crack (or i suppose if the head was warped) from the coolant passage in the block over right into the cylinder. and then from there it burns up, and the smoke gets spit out with the exhaust.

[evildky]

white smoke smells of gas likely a HG leaking in fowling out the plug

[onelessissue]

haha it's interesting reading the threads posted here because EVERYONE complains about the smell of gas. mine still smells like gas.

this should help you outif any one is trying to fix there fuel leak

nissan released a builten about 4 years ago for all the 300zx's for a fuel smell while driving and it stated that the clamped used on the rubber lines on the motor whould come loose for driving and that you should tighten all 10 clamps to get rid of that smell some times you can even see the leak just smell it i have seem lots of these

[Milo (San Antonio)]

Smoke and funny smells out your pipe 101-White smoke = Water burning (coolant leak or typical condensation)Blue smoke = Oil burning (turbo leak, head gasket leak, PCV's)Black smoke = Fuel burning (vehicle running rich)

Okay from your description it sound like you've got to much fuel going to one particular cylinder.

Now, we systematically answer questions to find out what it is?1) Have you pulled each sparkplug for inspection to see if all spark plugs are equally soaked? While you are at it, make sure all your plugs are equally gapped as well and do not show any signs wear and tear.

2) Have you recently replaced any injectors along with o-rings or done any other fuel work recently?

3) Have you Ohm tested injectors yet?

4) Have you inspected each injector for moisture around the O-rings yet for a pinched or cracking O-ring (note - moisture will normally protrude around the injector that has the leak with an obvious pungent smell of fuel as well. Normally it's pretty evident that you have a leak in a O-ring upon finding it.)

5) Have you tested each coilpack to insure working condition? (Done by running the engine and pulling the coilpack 1 by 1. Pull the coilpack connector...if the engine stumbles then that coilpack was working...move on to next one. If you pull the connector and you get no change in idle then you have found the back coilpack.

6) And lastly, check to make sure your FPR vacuum line is plugged in correctly?

[nathanmoris]

Ok i will look at all of these things and try it out thanks

[nathanmoris]

hi... hopefully you'll answer since i posted a late response... i checked my plugvs and this is what i got...

1 dry some combustion signs on plug 2 sam as one3 wet with gas4 same as 15 wet with gas6 is all dark black completely

These are new plugs that i just put in before i started up the enigne and they are gaped correctly.Any help would be nice thanks

[evildky]

sounds like #6 has a wide open injector or a bad coil pack

[Milo (San Antonio)]

Shoot me a call.

Milo210-316-1102

[evildky]

wow, I think I saw that number in a mens restroom somewhere