Hi all, as title suggests, it seems my Z has developed some sort of throttle issue, or fuel delivery issue or maybe something totally different such as idle switch or something..?

 

Last night driving home from my Mum's after a bank holiday roast, for some reason as I lifted the throttle to change gear, and then applied it again, it was as if the cable had just been removed from the pedal, I could put it to the floor and nothing would happen, I lift wait a couple of seconds and it was back on again, totally random events too, I couldnt distinguish it to any bumps I went over in the road or anything.. I've also noticed that there is lots of petrol smell once I've arrrived at my destination get out of the car, and im pretty sure its used most of a tank in about 200 miles... and 100 of those have been at 60-80 on the motorway..

 

oh and this morning on the way to work, it was fine, this afternoon on my way home its been horrific again.

 

I sat in my driveway when i got home and sat just trying to figure out what it might be.. when i blip the throttle it shudders in like a double "broom BROOOM" ( :D at my explanation there), however when I go up the revs smoothly, no issue, i've noticed a bit more exhaust popping than usual too..

 

Can we pool our minds into one odd shaped mulche and think of all the possible reasons..?

im thinking possible fuel blockage such as little deposits that have managed to get through or something? or possibly something to do with the idle cutting in when its not ment to?

 

I also noticed that my cable from the throttle is pretty loose, but its never caused an issue before??

 

Thanks very much for any help you can give me... its confusing the hell out of me..

 

Cheers

 

Sky

Edited September 1, 201015 yr by Sky89

on the bottom of the TPS is anoth connector, which is for the idle switch.

 

And don't be tempted to buy the MAF copies on Ebay, you'll be open for more trouble.

 

His username is Mr.F and he's MJP Eastern Auto ;)

 

Are you ever down near Brent Cross?

I'm 21 miles from Brent cross my google maps says, pretty just follow the a1 until welwyn garden city and that's me!

So it's not too much of a journey for me if I were to meet up Brent cross way, if that's what you were thinking?

 

And ok, have you ever opened up your tps?

Anything I should worry about if I were to give it a go? Such as skimpy wires or little springs which fly out?

 

Cheers

 

Sky

Any clue on my voltages?

 

Cheers

 

Sky

I live near Brent Cross and have a Conzult, could easily get your TPS at the right voltage.

 

No idea about what's inside but personally I'd replace it rather than repair ;)

What are these consult things? A digi readout multimeter type thing with an interface that fits in the plug properly?

And if my voltage is currently at 9.63 at it's minimum value, how will we change that to the 0.45 it should be reading?

Cheers

 

Sky

It's a diagnostics unit that plugs into a port near your pedals and works from a laptop.

 

To be honest I've no idea if the range is supposed to go that high but I'd imagine it'd have to be changed if you can't get the reading right down

Oh wow, that's pretty smart, does that sort of thing set you back quite a bit money wise?

Is it just a case of getting the software and the bit of kit?

 

But yeah that sounds like it could be handy, I'll see how this week goes, fiddling wise

I might contact you about it after the weekend, I'm really desperate to get this done sharpish because I've got a uni block release for 6 weeks in Portsmouth starting as of next friday.. Which is always a bitch when it comes to the car because there's never any time or place to work on it..

 

Cheers

 

Sky

had it for quite a while, one of Eric/Danny @DTA's units. Cost a few hundred quid but never regretted buying it.

Hi all

Just looking at my TPS sensor, just to see what it was doing.. is it wrong that i have only 2 wires going to the 3 pin connector? i dont understand why they would have 3 pins.. but 2 wires..?

 

 

I looked at the connector boot which has corroded through, and only 2 green wires are inside... which makes me think its always been this way.. but im just reporting on my slightly odd findings..

 

Also.. what are the procedures in a 'checking your tps - for dummies' sort of manner... I got 9.63 at min and 12 at max, which if you read in this guide..

 

http://www.zhome.com/ZCMnL/PICS/hesitation/hesitation.html

 

(you should look about 5/6 down the page and theres a picture heading the text of a tps with a green, yellow and red arrow)

 

says that 9-10v to 12v is often seen when looking at the idle.. but i read something else.. the erratic idle pdf, which says by connecting the middle pin to a multimeter and then the meter to ground, you should get 0.45ish at min and 4 at max...

 

(after reading again... I think I might have gotten the two plugs mixed up in my head, the plug in the photo above is for the idle, not tps, and the 3 pin plug also attached is the 'tps' side of things... i'll measure that again later...)

 

cheers

 

Sky

at a guess it could be that the TPS is used on other Nissan models and doesn't need 3 wires on a 300 hence the loom has 2 connectors. Can check my car tomorrow if it helps

I think I was just confused between the connectors, after reviewing a video of the TPS being pulled apart on the net (it was really good actually, all about z31 though http://www.youtube.com/user/LastHumansGarage#p/u/40/1Kn-2vu1IxQ) I could see that the one I thought was the TPS connector is the idle connector, thus only requiring the 2 wires.

As I say, i'll get on the other connector tomorrow afterwork or something to see whether my voltages are right, or at least make them right, then if its all ok.. then I have to start looking somewhere else, I'm thinking of following the link in the other post from start to finish... until I sort the issue...

 

Cheers

 

Sky

Hi all, had some very confusing driving today...

I drove to work, and back from work and I even ragged it around my local ring road, not really a single hiccup.. its possible its slightly underpowered... im not really sure, it definitely smells like its still chucking quite a bit of fuel into the mixture..

But not a single shudder, all I did last night was take my tps off.. took it inside to look at it and put it back on again about an hour later after some dinner...

It did however stall upon restarting after a bit of stationary revving when I got in, as if it was a little flooded maybe? (I was trying to see whether the drop in revs as it comes of idle was still there, which it wasnt really)

Also! I have a perfect 800-1000ish idle... i've never had that before... however, I did notice that the idle when the engine was stone cold, was also only 800-1000ish revs, which in my opinion is wrong... it should be trying to warm up...?

I've also heard a bit of a squeak from behind me as the ignition is turned, what I can only presume as the fuel pump.. its never made a squeak before though...?

 

any ideas?

 

cheers

 

Sky

also check the connection to your fuel pumpppppp

Fuel pump connections looked ok, the earths are a bit mucky externally as to be expected, I couldn't get the other capped connections off though, so I assume that they either arent supposed to.. or if theyre that secure they should be pretty damn good connections!

Though to be honest the car is running so well since I took off and then put the tps back on after looking at it... i dont know what i've done..

no hesitation, very good idle, though as I take off from a standstill I find that the revs drop still when it swaps over from idle to the loud pedal, so i have to make sure i put my foot down a bit more than usual..

Any ideas of whats happened?

 

Also, there are 2 pumps, one is just a poitive and negative, the other has quite a few wires... is the pump variable or something? along with a float sensor maybe?

cheers

 

Sky