Hi,

 

I have had this intermitent problem for a while though now it is more a problem than not. At low revs (up to 2 - 2 1/2) behaving poorly, especially pulling from stop. Revs to about 1 1/2 then acceleration dies & increases very slowly till past 2 1/2. Sometimes the rev counter will drop 500rpm then start to accelerate again slowly. Sounds a bit rough at these revs too as if it is struggling to keep the revs going - feel a slight pulsing in the revs sometimes, but once past problem range accelerates as normal. Idles ok, engine seems to run smooth enough.

 

Also my overheating problem is back again after about 1-2 months of it being fixed :cry: (previously I topped up the radiator & released the bleed valve to get rid of airlocks) Drove home today 10 mins - temp sensor at max. Though turning the engine off for 30-60 secs made it go back to half way. Soon went back upto max in about 30 secs though... Did not hear boiling water from within then engine though this time...

 

I dont know if they are related? I am getting really fed up with the car - only just after spending £1000 on various bits/serivce - new stainless decat exhaust, tyresm discs, pads etc etc

 

Anyone got any ideas?

 

Thanks

 

Barry

Dont give up take it to a specialist have you checked to see if you got a leak.

I have found a leak now, seen a small puddle of water on the board under the radiator - cant tell yet if it is a pipe or the radiator yet - will have a look today in the light. Topped the radiator up & the car has been driving alot better! Its not a massive leak - but enough water has escapped...

 

Could the lack of collant or a coolant leak cause the engine to run badly at low revs???

 

Barry

 

Dont give up take it to a specialist have you checked to see if you got a leak.

Well, you need to be told that 300ZXs blow head gaskets easily if water is used for any period instead of proper coolant. Sorry but a blown head gasket cannot be ruled out from the information you have provided. I would check for that first. Remember a little too much boost or advance assists this to occur.

The telltale signs are often coolant dumps from the filler tank, misfires esp after stopping or leaving overnight, even water being consumed faster than can be accounted for by the amount being seen under the car. Of course engine smoke in the coolant water is another way - there are special kits to check for combustion products in the coolant but you might be lucky to find someone who can do it.

With regard to the missing problem I would start by checking the ECU diagnostic codes - this is easy and should be as in the book. A faulty sensor error is trapped by the ECU and kept in the ECU until the battery is disconnected. So an intermittently bad sensor connection somewhere can be traced. Alternatively remove the connectors from the sensors and carefully inspect for corrosion - need a small wire or tweezers for that.

Been there done all these things -

Good luck