My 1990 n/a 300z wont start cold, roll starts fine and will start once car is warmed up fine. ECU shows 55 code, so nothing wrong, fuel pressure good, new fuel pump, filter, and regulator. All coil packs are good, consistnat strong spark observed at each one. Car does crank over, just will not fire. Please help me. :confused:

starter motor?:confused:

Bad battry.?

Thanks for the suggestion, keep sending more in!!!:D

electronic choke?

Anyone have a suggestion about electric choke being the culprit of my car?

I haven't read it but isn't the service manual of the 300ZX in a certain website supposed to have a symptoms-possible causes-solutions list?

 

 

http://www.300zx.co.uk/cgi-bin/manual.cgi

electric choke wont be a problem, it doesnt have one :p, all done by the ECU, only mechanical part to it is the idle air valve, does it fire up if you hold the throttle wide open?

 

Are you sure the battery isnt the culprit?

excuse my ignorance, haven't bought a 300ZX yet :)

 

i'll be back in 1-2 days :D

Originally posted by XTT

excuse my ignorance, haven't bought a 300ZX yet :)

 

i'll be back in 1-2 days :D

Got to be Battery as first checkpoint?

I meant that within the next two days, i'll buy one. :)

We have put two diff batts in it, and used jumper cables to give it a lil extra boost on both the batt in the car, and the other two we tried, this did not help in the least lil bit, so batt. is good. Starter is good, no clicking or grinding sound, it fully engages and turns the motor over pretty fast. I think it has summn to do with the injectors, wires, electronics to the injectors. Again there is no code being thrown by the ecu. Have pulled diff parts, camshaft sensor, ptu, and ecu threw codes, replaced part, no code, and still will not fire up and run. Thanks for the help so far, and keep it up!!!:D

Have you checked fuel is getting through!

yeah, good point, is the fuel pump pressurising the system when you turn on the ignition?

I know i am getting good fuel and pressure up to right after the filter, i also get good fuel pressure thru the regulator back into the return line, so i assume some where around the injectors is my problem. Thanks!!

if the car runs then theres nothing wrong with the injectors, nor the coilpacks, PTU, CAS.

 

I can't think of anything, have you checked the coolant temp sensor/harness? Very slight chance it could be that, but ive never heard of a bad temp sensor stopping the car from starting.

we checked the temp sensor first, and it was good replaced it anyway, no change on getting it to run, anymore suggestions?

has it always not started. When did it start not starting, did you do anything to it?

 

You say you have an n/a. Do you have TT spark plugs in it? I can't see how this would cause the problem if it will start from a push start, but its worth a look, seeing as you can only get TT's in this country.

This is all before my turbo probs (although still does it now)

 

I have a very similar problem to this.

 

When my car is cold, its starts but then put-puts then dies, I can do this for 5-10mins and then it feels as though the car has finally got a grip on the idle speed. If I try and hold the throttle down fully when starting it revs high once then dies down totally. I alsi find it worse if I try to use the throttle to start, ie. if I try to keep the revs up by pressing the accelerator, then it takes longer in the end to get going. Ie. now 15mins......

 

it seems to me as though the car is over fuelling as when you press the accelerator more fuel and air is passed in but it causes the car to die down quicker.

 

Jeff TT has set the car up on the Conzult and he says everything is where it should be, although he has never had it on the conzult when its been playing up!!!! The times when I have took it to him its been fine!!!!

 

Sorry to jump on this post but any thoughts would be appreciated as the engine is coming out anyway.

 

For the record, I have changed the two valve thingeys on the back of the plenums chambers that sit in the fuel line......I think their some sort of diaphram operated thingies...:rolleyes:

i live in usa, and that is were vehicle is, i bought it two yrs ago in summer, always started fine, as first winter approached it got harded and harder to start, next summer, only started if floored gas peddle on cold start up, even on warm days, this past winter nothing again, summer is coming and im trying to get it going better.

I got this problem when my traction control earth wire came loose and it stopped the injectors firing.

I doubt you have that fitted but it sounds like the fuel is getting as far as the injectors and they aren't doing their job.

 

Are the injectors on a separate harness that might have come loose or do they all go straight into the ECU?

If it was just one injector had failed it would still start I would have thought so must be something blocking the whole lot.

 

Is there anything that could block the fuel just before it gets to the injectors?

 

Do you have an alarm/imobiliser that might be cutting the injector circuits?

Has it over heated at some point? That could damage the valve seats and make cold starting difficult. Could try a compression test.....

I agree, sounds like a fuel cut off problem associated with an immobiliser.

I had this when mine was fitted, wire came adrift.

everything was ok except would not start - loose wire on immob!

Found it after a couple hours though.

Have you tried anybody local to you that has a Zed that could have a look, Try http://www.300zxclub.com in good old USA!

Somebody their may be able to help?