Question about Nissan 300ZX

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1990 300zx twin turbo idling high at 1500 rpm also there is a smell of fresh fuel ever since the rpm went to 1500

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

bestdarngood
  • 3037 Answers

SOURCE: High idle

Has it always been this way as it sounds like it warms up and then runs at idle at an ideal rpm which is quite common for many cars although I haven't specifically seen this car run before. Are both idles higher than normal for your car? If so, I can suggest what you can do but if it runs fine otherwise, I don't think there is anything really wrong with it.

Posted on Jul 21, 2008

fixincars
  • 335 Answers

SOURCE: high idle and engine getting hot

most common thing for this is either a failed coolant temp sensor that is not telling the computer that the car is warmed up and it is still running at cold Idle speed adn the code will tell you that.
Or a vacuum leak and the computer is trying to make up for the leak my making changes to the fuel deliery to keep the engine running .
If you find this information helpful please give me a fixya! Rating and if you need more help on this problem please contact me.

The only way to find out what code is stored in the computer and what turned the check engine light on is with an OBDII scan tool and also the only way to turn off the light but just turning off gthe light does not fix the problem, as soon as the computer does it checks again and you have completed the predetermined dive cycles the light will return so the only way to keep the light off is to properly repair the reason it was commanded on in the first place!

Posted on Aug 23, 2008

SOURCE: '97 Daewoo Nubira 1.6L Eurowagon

probably a vacuum leak

Posted on Sep 18, 2008

pal03246
  • 713 Answers

SOURCE: idle too high +goes higher when put in gear (manual transmision

IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.

Posted on Sep 21, 2008

  • 1348 Answers

SOURCE: 1993 Mazda Mx3 Revving high/Fluctuating during idle.

there is either a vacuum leak,or a valve on the throttle body called an iac that is bad. it is the idle air controller.alot of mazda have that problem

Posted on Oct 23, 2009

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1993 gmc suburban rough idle, stall in reverse


Idle air control (IAC) control rpm idle during idle.

Test it on idle with ALL electrical on full force.
RPM should increase.
If RPM remain the same then IAC is question.

Jan 13, 2014 | 1993 GMC Suburban

2 Answers

I have a 1993 300zx twin turbo that's heavily


you are SURE you have enough fuel pressure? like 60?

Feb 19, 2012 | 1993 Nissan 300ZX

1 Answer

After getting my 95 GMC Sierra 1500 5.7L V-8 back from a failed emissions test I let their mechanic fix it( or pass smog) However, now when the truck is in park the rpm's are at 1200 about 300...


I had an 89 Chevy Silverado with a high idle problem, A lot of money later and a lawsuit against a repair shop that said they fixed it and they didn't caused early engine failure and they wind up paying for a new engine. Long story short, I found out the main cause was I had to replace the throttle body gasket because it was bad causing more air intake and the on board computer tried to compensate for the air by adding more fuel therefore, high idle. I hope this helped.

Oct 28, 2011 | 1995 GMC Sierra C1500

1 Answer

HIGH HYDRO CARBON EDELBROCK 1406 PERFORM 1500 MAN TRAN FAILD EMISS HIGH RPM ONLY


High HC counts are due to a rich mixture, too much fuel. How does the truck run normally? To adjust the fuel mixture at the carburetor, make sure the truck is at operating temperature. Turn the idle mixture screw clockwise until the engine starts to lag then turn the screw back just until it runs smooth. Also make sure you have fresh oil as this could cause high HC's as well since fuel gets into the oil and make sure your PCV valve is operating correctly. If you can't get it adjusted correctly, you may have to pay a shop to hook it up to the emissions machine to get the mixture correct, unfortunately.
Hope this helps. Good luck!

Apr 09, 2011 | 1985 GMC C1500

2 Answers

The Turbo Charger does not seem to engage .I was led to believe that after around 30 miles per hr. it would be like haveing a passing gear. Oh yes the car is a 1984 Nercedes SD 300 series Desiel.


The turbo charger has more to do with rpms than road speed.The turbo uses exhaust gas leaving the engine to push more fresh air into the engine thus creating higher compression and more horse power.You should feel some boost above 1500 rpms if everything is working properly.If not then you should have the system checked by a dealer or a good diesel shop.Good Luck!

Apr 02, 2011 | 1984 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

I have a 93 isuzu rodeo that at times smells like fuel and gets 10 or 11 miles per gallon yet runs fine,except for an occational 2000 rpm idle. what could cause the poor milage and smell of fuel?


check for a leaking fuel rail,or injector,or the fuel pressure regulator,which is a vacuum operated valve at the end of the fuel rail.the high idle is caused by a vacuum leak,and if the regulator is leaking,that could be the fuel smell

Oct 28, 2010 | 1998 Isuzu Rodeo

1 Answer

I have a high idle on my Nissan 300ZX what could cause this?


I have a Nissan 300zx twin turbo 1990.... The engine and car are in very good condition ... well serviced... The idle speed will not go below 2000 rpm can you help as there is no manual adjustment...????

Apr 22, 2010 | 1990 Nissan 300ZX

2 Answers

RPM run high and slow to drop down


There could be two problems i can think of here. First would be a computer problem. The computer might be telling the car to run at a high speed. A problem like this might be fixable from your local garage. A problem like this could be expensive. Second, as engines age, they natually tend to idle higher. This is a normal occurance. This is accompanied by a decrease of gas mileage. For me, i went from normal 26mpg down to around 22mpg. A problem like this can be fixed by using fuel additives aimed at high mileage cars. I have used fuel injector cleaners, and that has brought my car back to her glorydays of 1996. I hope this helps, if not let me know.

Apr 09, 2010 | 2001 Chevrolet Cavalier

1 Answer

1995 Galant Idels between 1500 and 2000rpm.


hi, i would say the automatic choke spring broke, this is what controls the cars idle at cold and hot engine tempatures. if it's broke it is no longer able to automaticly regulate the rpm's the for making it idle at hi rpm. hope this could help you.

Jan 06, 2009 | 1995 Mitsubishi Mirage

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