For those cold weather starts...

[Hodo]

I have found the Air intake sensor....sort of. Yes there is one on the Z32, its not on the MAF persay. But it is part of the Fuel system......go figure. I stumbled across it looking for a new fuel pump. Mine is on its last few legs the cold weather has made its pressance known to my Zs pump. It is buzzing when ever its cold and for about a half hour after it warms up. Kinda anoying. I dont want it to fail on me untill I can save enough to get a new pump. At least I have a job in a decent shop now..... granted its a lincoln/mercury dealership.

[BlackBettyZ]

Yeah cold weather sucks imma probley have the same problems you got when i put my car on tha road next week, i need to get a job in a good shop with a decent wage.

[k3smostwanted]

Originally Posted by Hodo

I have found the Air intake sensor....sort of. Yes there is one on the Z32, its not on the MAF persay. But it is part of the Fuel system......go figure. I stumbled across it looking for a new fuel pump. Mine is on its last few legs the cold weather has made its pressance known to my Zs pump. It is buzzing when ever its cold and for about a half hour after it warms up. Kinda anoying. I dont want it to fail on me untill I can save enough to get a new pump. At least I have a job in a decent shop now..... granted its a lincoln/mercury dealership.

ok what is it?? the fuel temp sensor? im have narrowed it down to a couple things...fuel temp sensor (or the sensor your talking about), the ECT sensor, or the wiring harnesses leading to either. what do you think??

[Hodo]

Well according to the site I was at it was called the Air Intake Temp Sensor, but it was listed in the parts section under fuel systems..... They also had a seperate part called the fuel temp sensor. I have been doing some other research and most techs around here with experiance with Nissans say its ussually the ECT, or its wireing. So I would defenatly try and get the specs for its voltages and check them and see if they are good.

[k3smostwanted]

ahh....ok. ill see if i can find the specs for those. might just go ahead and replace it. i need to replace the wiring harness to my TPS also, thing keeps giving me a high idle but i just replaced the sensor so im thinking harness. probably end up being harnesses to both.

[forest_grump]

Originally Posted by k3smostwanted

ahh....ok. ill see if i can find the specs for those. might just go ahead and replace it. i need to replace the wiring harness to my TPS also, thing keeps giving me a high idle but i just replaced the sensor so im thinking harness. probably end up being harnesses to both.

Might look/listen around in engine compartment for vacum leaks and check EGR,PCV and the brake booster as your throttle plate shaft for excessive wear/play as vacum leaks will cause a higher idle.....oh yeah and I don't know if yours does this but some models when you get build up inside your throttle chamber(sucks oil thru PCV hose and contaminates) over compensate by raising idle speed/opening plates futher...goodluck

[k3smostwanted]

thanks...i have checked all lines. the only sounds that i here is a gargling sound in the passenger side engine bay. but i am positive it is my intake collector. anyways, im sure its the TPS sensor wiring causing the high idle, because if i wiggle the wires the idle will fall back down to normal. plus, it only does it every once in a while.

im concerned with the cold start. it am thinking ECT sensor now because it is temperature sensitive within the engine. because even in the summer with 100 degree heat, it would still have a cold start but i wouldnt have to crank on it like i do in the cold. i would have to start it with the foot on the gas and then hold the gas a little to keep it from dying. so whatever sensor it is, it reads the temperature of the engine. which leads me to think ECT sensor or harness, unless anyone else could give me some reasoning behind another "could be"....

[forest_grump]

Unplug and clean corrosion out of TPS and wiring connection to TPS

[forest_grump]

Also clean build up out of the inside of throttle chamber where throttle plate closes which will cause an over rich fuel mixture by not letting enough air pass thru throttle plates at idle when dirty

[k3smostwanted]

yeah, i cleaned the throttle bodies as good as i could get them and behind the plates. pretty dirty but not too bad. i also have cleaned the wiring harness to the TPS sensor. i am pretty sure the wires are shorting right near the main harness.

otherwise the cold start problem i am more and more thinking the ECT sensor or the wiring harness to it. maybe this week i will check it out further. the sensor is only $20 so its worth a try. we will see!!!

[forest_grump]

The old ones had a potimeometor(not spelt right) that controled the cold start injector on intake....if yours has a cold start injector i would unplug wire connector from it and ck for corosion...when cold start injectors are not used for awhile they can stick also...crank it over when cold and have someone take an old piece of garden hose placed to ear with other end against cold start injector and listen for it clicking or use a *noid* light to watch for pulse same as you would on injectors


hey have you tried cycling the key from dash lights on/pre start and all the way off several times to let fuel pump cycle on and off a few times to build up fuel pressure in lines(they do this when check valve in pump lets fuel pressure leak down when sitting)

[k3smostwanted]

yeah i have tried turning the switch on and off before start-up to build fuel pressure. it helps shoot the RPM's up on the first crank but then dies, then after that it slowly builds the RPM's again until it gets a little above 500RPM's and it finally starts. that was a little hard to understand....let me explain it a little better. as soon as i try to start it, first thing in the morning, it acts like it wants to start for a split second. RPM's jump up to about 1200 like its supposed to but it doesnt hold at all. i have tried giving it a little gas when this happens, i have tried a lot of gas, and i have tried no gas. nothing stops it from immediately dropping in RPMs. it doesnt even attempt to hold the RPMs for a split second. it just starts and drops all the back down.

and the cold start injector your speaking of....i have never heard of such thing on the z32.

[Hodo]

I have heard of the cold start injector but not on the Z32 car.... or really on any VG30DE engine. Doesnt mean there isnt one out there with it. Its sounding like a electrical problem. I am officially baffeled, its probly something simple we over looked.

[forest_grump]

Last senero reminds me of blown headgasget or moisture in the dist. cap old school de ja vous lol


Anyways...Have you checked for a faulty TPS already????(tested values with ohm meter ect ect ect )

[forest_grump]

Sometimes a problem is a combined effort on our temper/mental toys ploy to baffle us...I have many times found more than just one problem causer in a search to cure the illness....best of luck and don't overlook the simple basics