Hi everyone I have an issue with my 300 that is causing me a bit of a headache my car is a 3.0 v6 non turbo auto.

 

When accelerating from a stand still the engine hesaties for a couple of seconds as if it was going to stall then it goes as it should I have been trying to find the issue for a few months now and it still doing it.

 

One thing that I noticed is when the car is on idle the sound comeing out of the drivers side exhaust is normal but the sound comeing out of the passenger side exhaust sound very different its popping and banging.

 

Can any one shed any light on why it's doing that or what could be causing it.

 

Also one other strange thing is the engine in my car is a non turbo but if I put my reg in anything on the internet like insurance companies motor factors etc it comes up saying Nissan 300zx 3.0 twin turbo.

 

Dose anyone know why this could be thanks.

Sounds like an electrical issue like spark plugs or coil pack and I think all Z's will come up as turbo in the UK as the TT was the only model sold.

Sounds like an electrical issue like spark plugs or coil pack and I think all Z's will come up as turbo in the UK as the TT was the only model sold.

 

Thanks I'll cheak the spark plugs and the coil packs on the passenger side of the engine.

 

The car was imported from Japan in 2000 I was wondering if maybe at some point it had a turbo engine and someone has put a non turbo in it cos it's cheaper to put a non turbo in if the turbo engine blew up.

The car was imported from Japan in 2000 I was wondering if maybe at some point it had a turbo engine and someone has put a non turbo in it cos it's cheaper to put a non turbo in if the turbo engine blew up.

 

I can help you with that Ash:

 

https://www.300zx.co.uk/forums/showthread.php?190201-New-to-the-club&p=1987376&viewfull=1#post1987376

I can help you with that Ash:

 

https://www.300zx.co.uk/forums/showthread.php?190201-New-to-the-club&p=1987376&viewfull=1#post1987376

 

Thanks I'll have to see if I can find the vin number tomorrow and have a look on there

I had similar years ago, was a failing injector and corroded connectors.

I had similar years ago, was a failing injector and corroded connectors.

 

Thanks that's the area I think I need to be looking at.

Hi Ash

 

I’m no 300zx expert but I have owned a few over the year (although no NA). I’d be happy to pop over a take a look at it with you as a second pair of eyes and ears may help and I’m not too far away. PM me your number and we can sort out a date and time.

 

Cheers,

Chris.

Hi Ash

 

I’m no 300zx expert but I have owned a few over the year (although no NA). I’d be happy to pop over a take a look at it with you as a second pair of eyes and ears may help and I’m not too far away. PM me your number and we can sort out a date and time.

 

Cheers,

Chris.

 

Hi thanks for the offer that would be much appreciated I will PM you once I have worked out how to.

I would recommend following the 6p’s as a general health check that you can carry out yourself. Many of the checks will be made much simpler if you, or a local member that can help you, has the conZult diagnostic software.

 

http://twinturbo.net/nissan/300zx/forums/technical/view/922678/The-6-Ps-Proper-Preparation-Prevents-Piss-Poor-Performancegt.html

Hi everyone I have an issue with my 300 that is causing me a bit of a headache my car is a 3.0 v6 non turbo auto.

 

When accelerating from a stand still the engine hesaties for a couple of seconds as if it was going to stall then it goes as it should I have been trying to find the issue for a few months now and it still doing it.

 

One thing that I noticed is when the car is on idle the sound comeing out of the drivers side exhaust is normal but the sound comeing out of the passenger side exhaust sound very different its popping and banging.

 

 

 

 

Ok what you have here is a set of common issue with the zed engine, and in the main is due to poor or incorrect maintenance, there are a series of adjustments that have to be maintained / adjusted periodically to ensure the engine runs and performs as it should, many zeds have fallen foul of these problems as the engine will actually run but just not as good as it should. Often new owners who may of come from smaller engine cars will not "notice" the issue, some will of course, the issue`s also probably occur over a period of time and the old or present owner just does not notice the decline until a later date.

 

Now this is not a new issue and have seen scores and more new owners leaving the workshop with big smiles on their face`s from just a basis check and set up on the ConZult system, however there are some basics that you can check but would 100% suggest get it to Jimmer @ PowerZedto do it correctly, the money spent will pay back in a better driving experience and likely better mpg.

 

 

So the stumble or hesitancy your experiencing when pulling away will likely be a combination of things, in the main however this particular fault is caused by an unbalance in the engine, be it air, fuel or ignition.

 

Be wary of having an un-knowledgeable garage look at it, or mates who reckon "they know" simply put, the zed engine is a mix of contradictions when setting up and requires long term experience to get it right.

 

So to understand what is happening, when you move off, the engine will come under load, that load has to be taken into account for or the engine is in danger of stalling or hesitating such as your experiencing, so basically something that looks after that part of the engine running is not right.

 

 

Lets start with basics, check the air filters, these been clogged will cause all sorts of issue`s

 

The throttle balance, twin throttles working off a single cable, very common for the synchronisation adjuster screw to be mistaken for the idle control screw ( a little knowledge can be a bad thing ) and that will mean one throttle is leading the other, this is an air imbalance and also is a throttle sensor imbalance as the throttle sensor tells the ignition to advance to prevent stalling and hesitation, now the tps is on one side only, so if the opposite throttle is the lead one, it will feel like your ready to pull away but wait the tps is still closed ! see simple issue ..big problem.

 

So once the throttle balance is checked the tps setting will need checking also.

 

Timing, a retarded ignition will have the same effect, albeit slightly less, as when the tps calls for advance timing the base timing already too low and will only bring it up to normal tdc ( 15deg).

 

 

Air leaks, even small vacuum type pipes can cause air in balance and even worse is mixed up vacuum pipes, this is where knowledge of the layout is required to identify if anything is wrong.

 

Spark plugs, the heart of the ignition system, poor or old plugs will have a detrimental effect on the whole running of the engine and for a small cost is easier to replace rather than remove to inspect as it is almost impossible to know for sure if a used plug is failing or not, hesitancy when pulling away will unlikely be caused by plugs alone though.

 

It is very unlikey that there is any real bad issues and some or all of the above would quickly sort the issue out, also unless your really committed to spending hours and hours / days and months studying, don`t second guess what has taken some many years to understand, with especial attention to the various diagnostic systems such as ConZult, brilliant kit for this kind of trouble shooting and for those who know how to use it correctly, for me only tow two people come to mind that applies to, one is in Bristol and the other in Portugal ! lol

 

Jeff

 

 

 

 

1 Throttle balance

2 Throttle position sensor

3 Throttles clean

 

4 Timing ignition timing

5 Air leaks

 

Basic checks

 

Air filters

mixed vacuum pipes

 

Options

Spark plugs

 

Deeper issues

Timing belt ( timing issue )

Injectors

egr valve ( open )

Edited January 26, 20196 yr by JeffTT

Throttle balance check and adjust tech I did back in 2011, still valid today though ..

 

https://www.300zx.co.uk/forums/showthread.php?151303-Throttle-balance-tech&highlight=throttle+balance

 

 

 

 

Jeff

Here is an interesting check done on a series of members cars several years back and just look how many needed throttle balance adjusting !

 

https://www.300zx.co.uk/forums/showthread.php?154487-JAE-ConZult-results&highlight=conzult+results

 

Jeff