hi there i have recently bought a nissan 300zx twin turbo.i went out for a drive in it the other day and the car drove fine nothing seemed out of the ordinary,but i parked it in a car park for about 15 mins and when i retured the car would not start.so i left it to cool down and retured about 2 hours later and it started easy and drove fine again.has any one else come across this problem if so can they point me in the right direction thanks...

Was it turning over?

If it was but wouldn't fire up it could be the PTU (ignition unit) is failing.

Quite common when it starts getting hot in summer.

Early PTU's were prone to this but a series 2 unit fixes the problem.

yea it was turning over just not starting and the car is a series 2 1995 model ive dont no to much about them at the mo but ive been told it could have something to do with the fuel tempreture does this make sense to you??

I'm not sure when the series 2 PTU came in it was a recall by Nissan and not related to the introduction of the series 2 car I don't think.

There is a fuel temperature sensor that adjusts the fueling for warm starts but i've not heard of it causing a problem before.

Have a look on the left hand side of the cam cover near the hard pipes from the radiator on the front of the engine.

You should see one of the following fixed there with a harness to them.

 

 

Series 1 on the left is prone to failure.

Series 2 won't have this problem.

 

90% sure that will be your problem.

Cost a fortune from Nissan dealer so don't buy one there!

It will probably get worse if it is this but unless you can get it to go wrong regulalry and get someone on here to loan you a new one to test it I don't know how you'll find out for sure.

is the fuel temperature sensor under the intake mainifold.in the v of the engine??

ive got the one on the left.will the series 2 one bolt stright on in its place??

is the fuel temperature sensor under the intake mainifold.in the v of the engine??

 

Yes I think it's under the cover in the center of the engine but it's easy to get to.

You'll see a single wire plug connector goes onto it.

ive got the one on the left.will the series 2 one bolt stright on in its place??

 

The series 2 comes with an adapter harness that plugs in it's place.

5 minute job to swap luckily.

You might be able to get a used one in the For Sale section on here or a new one from DTA Motorsport or MJP in the traders section.

I seem to remember Nissan want £350+ for one even though they were recalled worldwide.

£100 to £200 used or new elsewhere so you really need to check that's the cause somehow.

Worth cleaning the connectors on the PTU and fuel temp sensor as well.

They go really green with corrosion and need a scrub with a small file or screwdriver.

Having said that the PTU failures always start every year when it warms up!

I've been here too long answering them :D LOL

yea it was turning over just not starting and the car is a series 2 1995 model ive dont no to much about them at the mo but ive been told it could have something to do with the fuel tempreture does this make sense to you??

 

Hi Ryan, if your car is a 95 then it is a series 4.

 

Paul

I bought my Series 2 PTU from Mike Feeney who trades on here as MJP Auto and from memory, I believe it was around £120. So not too expensive.

Where in west sussex are you mate? im in worthing, can pop over and see what i can do, if needed, plus ive got a spare PTU, and loads of other bits.