A&Q about 350Z
Q:
Driving to work this morn, went to overtake a truck in 5th, put my foot down and it went but it felt like there was something holding it back. I had an old mk2 that used to do the same thing when the carb started to freeze up. As soon as the engine had got fully warm it was fine though! very wierd, anyone ever experienced this?
A:
come on guys, someone must have had something like this?? anyone??!?!?!
A:
How soon was it after you'd started the car up? The reason I ask is for the first couple of minutes after starting the car from cold the engine will be in the cold start cycle. During this time the mixture is leaning out as the car warms up, this is controlled by the warm up regulator and should be a smooth transition, perhaps in your case it's not?
It's worth checking the usual things, look for vacuum leaks, check the height of the air metering flap in the airbox and clean it up (as per Haynes manual), rotor arm, dizzy, cap etc etc
Another good thing to check is the condition of the earth leads, particularly to the gearbox, clean up the contacts there and at the battery. Check the wiring to the temp senders on the side of the head, clean up and check connection is ok at the ECU multiplug (check ECU isn't under water - mine floods a bit there in heavy rain!).
Hope that helps.
A:
possible dodgy injector,
mine had the same problem, drove like it was carb icing-but it was injection, replaced them all as we saw the spray was a dribble and not the fine mist it should be.
A:
Sounds like a similar fault I had on mine many years back, warm up regulator. Does it cut out or try to cut out after you've started it up, more so when you touch the throttle to pull away ? As said above, injector is another possibility.
A:
Right then, it can't be injectors as i replaced them when i did the conversion, same with dizzy cap, rotor arm, conections to the temp senders. It doesn't like starting thats for sure, very random idle when it's cold, sometimes revs up to 3k by itself. When i did the conversion i was told that i wouldn't need the throttle switch so i didn't connect it, but i'm now thinking that this might have something to do with the bad idle.
Also the WUR isn't plugged in. Couldn't work out what it needed to be plugged into from the mk2 loom i had.
Could it be the warm up injector not supplying enough fuel??
A:
Also the WUR isn't plugged in. Couldn't work out what it needed to be plugged into from the mk2 loom i had.
Could it be the warm up injector not supplying enough fuel??
Could be your problem. I'm no expert on Wur's but ive been told you can get them modded to supply more fuel to the engine on start up as the K-jet tends to under fuel initially. If its not plugged in at all then may cause problems.
A:
No WUR connection sounds like the problem then! Have you got the ISV on there and connected or just set the idle manually and use the Mk1 aux air valve?
When you say the WUR isn't plugged in, do you just mean the electrical connection to it? It is plumbed into the fuel lines I assume?
Also, I think you are referring to the cold start valve (CSV) as in it's not supplying enough fuel on start up. It's unlikely as if I remember correctly this is triggered by the starter cranking for cold starts but only when it's really cold, like colder than it tends to get in the UK so it generally won't be in use.
A:
The ISV is on there, but as i said with no throttle switch at the mo. i'm gonna try and sort that this weekend though. I set the idle as per the normall 16v method.
Yeah, the electrical connection is not plugged in rather than the fuel lines.
I meant the 5th injector on the end of the inlet manifold. Isn't this triggered by the WUR as there's no physical or electrical link to the stater motor, i don't think...?
Regarding the supplying more fuel, i've been told that you can add washers to a part of the metering head to allow more fuel preassure into the system. But this wouldn't affect the cold start.
A:
id connect the wur and take it from there
A:
I havn't got a plug on my loom for it, i've got a mk2 loom lyin about so can't probably find the right plug for it, but what do the wires need to be connected to?
It's only done it once so far... not been cold enough again yet. V-wierd.
A:
The ISV is on there, but as i said with no throttle switch at the mo. i'm gonna try and sort that this weekend though. I set the idle as per the normall 16v method.
Yeah, the electrical connection is not plugged in rather than the fuel lines.
I meant the 5th injector on the end of the inlet manifold. Isn't this triggered by the WUR as there's no physical or electrical link to the stater motor, i don't think...?
Regarding the supplying more fuel, i've been told that you can add washers to a part of the metering head to allow more fuel preassure into the system. But this wouldn't affect the cold start.
The electrical plug is a grey one with (I think) a yellow and red wire going to it, can just about make it out on this pic of my engine... as for where the wires go, not sure as they are off into the loom on my Mk2. Perhaps the green Haynes manual would help, it's full of wiring diagrams?
Yes, the fifth injector is the cold start valve and should have a blue electrical plug to it (again see pic), again, the wiring goes off into the loom but I believe it is triggered by the starter motor cranking assuming the temperature conditions are suitable to require it.
The part you can add washers too (shims) is the metering head to alter the system pressure but if the car is running ok when warm then I would say that'll be fine, it'll be the lack of WUR connected that's causing it to run rough during warmup I would say. Do you have the WUR mounted in the normal position on the side of the head where it can 'warm up' as the head warms up?
A:
Hmmm, i'll have to see if i can find a wiring diagram of the appropriate bit. It's mounted in the same place as normall, just not plugged in. The fifth injector is plugged in, but i'm not running any of the mk1 air box type stuff any more and i can't remember if there were any more electrical connectors that wern't re-connected. What does the fifth injector run of?