Question about 1990 Nissan 300ZX

2 Answers

1990 300zx non-turbo coupe 5 speed

I don't know if this really works but ill try it

I have a 1990 300zx non-turbo that is blowing out white smoke (not blue)and something wet smells like gas out of the tail pipe. I need help on what to do to fix it.

Thank you
Zchic

Posted by on

  • Gary Queen
    Gary Queen May 11, 2010

    White smoke is an indication of water in the combustion chamber. Are you going through coolant?

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 49 Answers

Old post but I would like to state that white smoke and white vapor are two different thing and blue smoke is sometimes so ligh it looks white but does act like heavy smoke. Evanescence of water vapor looks a lot like smoke but dissipates a lot quicker but in mass quantities can look like smoke (yes..I been dying to use that word ever since I heard of the band Evanescence lol). Transmission fluid can be sucked into the engine via a bad shift modulator both that has no bearing here (just FYI). In either case you would be fouling out spark plugs due to oil or water saturation and causing unburned fuel to be expelled.

Posted on Feb 17, 2009

  • Marco Avila
    Marco Avila Jun 03, 2010

    Hi, did my info help any? Did you ever find the cause?

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 1,586 Answers

Garyq1970 is right - white smoke usually indicates burning coolant. How full is your radiator? You should see coolant right up at the top of the fins inside when you remove the cap. Take a look and see if a) you are low, and b) if the coolant looks sludgy or contaminated, brown in color. If it's low, top it off and monitor it over a week's driving and see if you have to refill it again. If it's contaminated and brown, you have a problem.

Usually when you're burning off coolant, it's because of a torn head gasket allowing coolant into the cylinders. If it's not contaminated, that means the tear is between a water galley and the cylinder. If it's browish looking, then it's a tear between a water galley, an oil galley, and the cylinder, and the coolant and oil are mixing as well as being burned off. Either way, it's a very involved repair, as the top of the engine has to be removed to fix the problem. This involves removal of the upper and lower intake manifolds, and the entire timing belt system (which, given the in-depth job that the timing belt is, you might as well replace it, its tensioner, and the water pump and thermostat as well, to save yourself the labor later on). It's not a job for the faint of heart or wallet.

You may not be looking at such a repair but if you can monitor the coolant for a week or so and reply afterward and let me know, I'll take it along from there (just send me a request on here).

Posted on Sep 08, 2008

  • Meng Lee
    Meng Lee Aug 15, 2013

    i have a 1990 300zx na and i replace the injector with 370cc which is the turbo injector then the engine wont start, so i send my icu in to upgrade to fun 370 cc injector. after the icu came back i plut it in and the first second i start the motor, theres white smoke coming out of the exhaust. sometimes it would stop but always come back. you guys know what went wrong. thanks

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why is a 2001 VW tdi 1.9 with 93,000 miles blowing large cloud of white smoke? is this a major repair? after this happened checked and it is showing no oil or anything on dipstick for oil. oil was just...


I'm affraid it's the turbo that is faulty, and it's not a cheap job. the turbo has a oil pipe going to the turbo to lubricate the turbo bearing . When the bearing wears out the oil enters the engine and burns causing to smoke. Good luck

Jun 26, 2011 | Volkswagen Beetle Cars & Trucks

1 Answer

98 grand prix 3.8 non-supercharge starts but wont stay running have to keep foot on gas pedal to stay running blows out white some trough the exhaust. no coolant in oil what is causing this


If it is blowing thick white smoke that is coolant. You can lose a head gasket in places where only coolant passages go through so you don't always get oil/coolant mixing when this happens. Take the radiator cap off and see if air bubbles through it. You can also try pulling the spark plugs to see if one or more looks really clean.

Jun 04, 2011 | 1998 Pontiac Grand Prix

1 Answer

My 99 9.5 4cyl saab blows blue and white smoke . i ve been told it is a turbo replacement fix. the car has 161k. Is it really worth fixing the turbo? The car is in good condition, new h2o pump,tires,good...


I would replace to turbo. To make sure it is the turbo and not the head gasket, remove the air intake to the turbo (not a hard job) and then (with engine off) grab that turbo shaft. Try and pull and push it and move it up and down. If there is ANY play, it's the turbo. If you got 161k out of one turbo, that is VERY GOOD. Normal is 120k or less. There is a guy on ebay that sells rebuilt for about $300. If you do the work yourself (Experienced Tuner) you can save $1k. Else you will have to have a shop do it, usually about $1,200 or so for everything. If you are in the WI area, we could work something out.

Aug 21, 2010 | 1999 Saab 9-5

1 Answer

What would cause my 1988 ford f250 with a 7.3 non turbo to blow white smoke nonstop


if the white smoke is coming out of your exhaust, it indicates coolant entering the combustion chamber, likely a cylinder head problem. good luck!

Jun 21, 2010 | 1988 Ford F 250

1 Answer

White smoke comes out of exshaust


white smoke is an indicator of coolant leaking into the combustion, so a leak down test

Oct 30, 2009 | 2006 Fiat X1/9

2 Answers

Shuddering and white smoke on acceleration


yes it is most likely the turbo oil seal is leaking.

May 03, 2009 | Ford F-250 Super Duty Cars & Trucks

1 Answer

1999 Ford F 350 7.3 blowing white smoke


Check the EGR and the fuel pressure regulator.These are very common culprits.

Jan 10, 2009 | 2001 Ford F350 Super Duty SuperCab

1 Answer

My 91 dodge spirit es doesnt rev. up


it sounds like you have a blown head gasket

Jan 04, 2009 | 1990 Dodge Daytona

8 Answers

Saab 9-5 blowing white smoke from exhaust


One way to check for a blown head gasket, is to simply smell the coolant reservoir. Pop the cap, and see if it smells like raw gas. Every headgasket, I've diagnosed has had this smell, even if the oil is not contaminated. Another way is to hook up a coolant pressure tester, and run the vehicle for 15-20 mins or so. If the head gasket is blown, the pressure will exceed 15 psi. sometimes as high as 25 psi. If there is oil in the coolant overflow tank, the head is cracked, about 90% of the time.
I'm working on a 03 Saab 95 2.3l t. This vehicle smokes on initial start up, then the smoke disapates, and the vehicle is fine. Another mechanic diagnosed it as bad valve seals. I disconnected the pcv system, and the vehicle no longer smokes. If the valve seals have gone bad, the vehicle will smoke on acceleration. Also if the turbo seals are leaking it will smoke more heavily on acceleration.

Sep 09, 2008 | 1999 Saab 9-5

Not finding what you are looking for?
1990 Nissan 300ZX Logo

476 people viewed this question

Ask a Question

Usually answered in minutes!

Top Nissan Experts

yadayada
yadayada

Level 3 Expert

63801 Answers

Phil Lovisek
Phil Lovisek

Level 3 Expert

705 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21990 Answers

Are you a Nissan Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...