Question about 1989 Nissan 300ZX

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1987 nissan 300zx failed emmissions too much co I

1987 nissan 300zx failed emmissions too much co I installed new injectors, tps sensor, wires & plugs before inspection. Prior to work car passed emmissions. Help! could it be o2 sensor or egr valve?

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Change oil and filter put a emission cleaner in fuel

Posted on Jul 11, 2009

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1 Answer

What causes co & hc readings to high


HC is raw or un burnt fuel. CO is incomplete combustion meaning the air fuel is burnt but not burnt completely. check O2 sensors for operation, fuel pressure, gas in oil or how long has it been since an oil change. check engine timing, dirty injectors. when was the last time a tune-up was done plug/wire condition is the air filter clean. just some things to check

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Emissions failure 1986 nissan 300zx


MAP sensor needs cleaning or is bad ?

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High idling on nissan 1987 300zx


TPS, THROTTLE POSITION SENSOR may be bad, loose, etc.,

Mar 08, 2013 | 1987 Nissan 300ZX

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1986 NISSAN 300ZX FAILED EMISSIONS HIGH CO


I would replace CATalitic converter, this car is old, plus a tuneup is 100% necessary , spark plugs wires, ditributor cap & rotor, plus both the air & fuel filters need replaced. change oil & filter. then you will pass emissions test. and your car will run like its suppose too. if you don't do all this , then buy a new car !

Feb 02, 2013 | 1986 Nissan 300ZX

1 Answer

1987 nissan 300zx turbo 5 speed runs fine just doesnt have the power it used to


hard to diagnose whithout seen it, but; have you checked ignition timing.
cam shafts timing- looked at boost gage-if the boost indicator does not
move, check if the booster turbine are not jammed. Also would be good idea to check throttle position sensor output and catalitic converter for free flow.

Dec 03, 2012 | 1987 Nissan 300ZX

1 Answer

My 1986 Nissan 300zx non-turbo was running fine, then just stalled out suddenly and would not restart. I checked the plugs, wiring, fuel, all are OK. I installed a new coil, distributor cap and rotor. If I...


It sounds like the number 2 injector is hung open.

It will dump fuel and cause all sorts off issues with the ECU.

You should ohm that injector and compare it with the others to see if it is wildly different. If so, change it out and retest.

Jun 27, 2010 | 1986 Nissan 300ZX

1 Answer

87 nissan starts then stalls


jdmbaker: There are a few areas I would suggest looking in.
First, I would be looking for a false air problem. This is a condition where you have un-metered air getting into the engine. A torn airflow meter boot, or large vacuum leak such as a split pcv hose.
Second, your injector pulse width is primarily dependent on the coolant temperature sensor. This component is located at the front of the motor just below the thermostat housing. The sensor gives the ECM resistance values based on the temperature of the coolant. If the sensor fails, usually, they have a tendency to create a lean condition. This shortens the pulse width of the injectors which essentially starves the engine for fuel. One way you can perform a quick test for a lean condition, is to pinch off the return hose for the fuel going to the tank. If you look at the fuel hoses, they run right next to each other. You have one which comes from the fuel filter. That is the feed line. Pinch the other hose. This will boost the fuel pressure causing more fuel to be sprayed out of the injectors.With the hose pinched, hit the throttle, if the engine will rev up, you persue the lean condition theory.
Third. Check for a weak spark. A severely worn cap and rotor or bad plug wires can cause a hesitation and stalling problem if they are bad enough.
Fourth. The air flow meter could be faulty. This is a very common symptom matching you description.
Odds are that one of these are the solution. Good luck and let me know how you do.

Jul 14, 2009 | 1987 Nissan 300ZX

2 Answers

How do i reset the TPS sensor a 1990 nissan 300zx non turbo...?


at idle ,if the tps is adjustable,with slotted screw mount holes,,while at idle move tps(with screws loose )untill idle sounds about right ,then tighten ,with out rpm meter hard to adjust just right ,but not crittical

Jul 03, 2009 | 1989 Nissan 300ZX

1 Answer

1986 300zx failing low speed NOx emissions test in Texas. Changed cat converter and egr contol valve. What should I look at next? All other checks are OK


these cars are known to have injector failures and that would make you fail a emmission test easily. also i would reccomend looking at your oxygen sensor.

Jun 09, 2009 | 1996 Nissan 300ZX

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