I have a 1984 300zx Turbo and im having a issue someone may know the answer to.When the car is first started for the day it idles rough and if i press the pedal to the floor in drive or park it spudders and bogs until all the sudden it just leaps with full power and revs and drives away.This only happens when the car isnt at operating temp,once its up to operating temp the car runs perfect accept for a little bit of a high idle in park.Now i have done some research and saw that my tps could be a potential problem.The one thing i have noticed is the replacement tps for a automatic has a pigtail and another connector on it, and the manual tps has just one connector.For some reason my car has just a single connector tps.But even if i did have a dual connector tps i see no other connector anywhere near my tps that it would hook up to can anyone help me?

 

TPS is fairly likely, but not as much as the engine temp sensor. hesitation when you floor it is characteristic of running lean. when a car is cold, it likes to run rich. so if the temp sensor is out and you are running well when it's hot, it means that it's not richening the mixture any when it's cold, so you get hesitation. check the temp sensor connector and the TPS connector. clean them both. there are ways to test both off them i believe as well. one of them may be bad, or a bad connection may be your only problem.

 

Okay a better way to explain it is say on first intial start of the day it has one high rev on its own then settles to around 700-800 rpm.At that point it is running rough on the verge of dying. If i try to put the car either in drive or leave it in park and put it to the floor it sputters and almost sounds like a misfire.Then all the sudden without warning the car just shoots off like a rocket and runs fine for the rest of the time until it is turned off and cooled.Then the scenario starts all over again.Does this still sound to you like the tps?You mentioned engine temp sensor are you speaking of the coolent temp sensor or the cylinder head temp sensor?Thank you very much for your input

 

coolant temp sensor. that one hard acceleration can be enough to warm it up so that it runs properly after that. personally i wouldn't put many eggs in the TPS bag, but i haven't had the exact problem, so my advise isn't worth publishing lol. i still say coolant temp. sensor.

 

Coolant temp sensor? You sure you don't mean cylinder head temperature sensor, henceforth to be shortened to CHTS? It isn't the TPS but adjusting that is cake so go ahead and adjust it. If it can't be adjusted, replace it but it's prolly just fine.
When you cold start your car it's in open loop mode with the ecu using preset fuel and timing maps. After the engine warms up the ecu switches to closed loop and uses feedback from various sensors to adjust fuel and timing.
Clean all your electrical connections and run the ecu test for codes.

 

Isnt the cylinder head temp sensor part of the fuel pressure regulator on the 84 z?And the coolent temp sensor is located near the thermostat housing directly below the distributor correct me if im wrong?

 

i wouldn't exclude the CHTS, but i'm still thinking the coolant sensor.

 

CHTS doesnt touch any coolant it measures the temp of the cylinder head not water temp. clean your connections on most of the EFI stuff under the hood, run the codes and when was the lsat time you checked, the plugs, wires cap and rotor?

 

hoov are you saying that there is no coolant temp sensor? i'm sure that they have both.

 

Coolant sensor???
What kind of car do you own KasbeKZ?

 

i have a z32, and it has a coolant temperature sensor...
have you two seriously not heard of coolant temp sensors? am i having a brain fart and using the wrong word?

http://www.rockauto.com/catalog/rafr...1209552k482727

on that page is a coolant temp sensor for the gauge with one connector, and one for the ecu with two connectors. correct?

 

They can call it a coolant temp sensor if they want to but it's a sending unit. Sends temp info to the coolant temp gauge. The other part is a chts and they can call it whatever they like also. I stopped by an auto parts store today for a TB gasket. The girl scrolled through the gaskets page and said "we don't sell those." I asked to use her computer. I found the gasket listed as a TBI/EFI gasket. Auto parts stores /roll eyes.
His coolant temp sender is not causing his problem. Trust me on this

 

no, but the CHTS doesnt even go anywhere near the coolant and measures the head temp, where as the CTS measures water temps. but i would worry about replacing anything until your clean off those connector's.

 

I have just changed my alternator,fuel filter,pcv valve,cap,rotor,timing belt,timing belt tensioner,wires,plugs,starter if that is any help so what is the consensus chts or cts which one do you think id have a better shot of fixing my problem?

 

No offense intended but what in god's name would lead you to believe that a coolant temp sending unit could possibly cause the problem you have?
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Okay i need someone to clear this up the autoparts stores actually call the chts a cts here is the picture in this link http://www.autopartswarehouse.com/de...W43b3f85c7ab9e is this in fact the chts because this sure looks like it from looking at my engine this morning and reading about it online.I think this is where the mixup has been in this thread just a simple case of the same part with multiple names

FIXED:

Okay i need someone to clear this up. The autoparts stores actually call the chts a cts. Here is the picture in this link: http://www.autopartswarehouse.com/de...W43b3f85c7ab9e Is this in fact the chts? Because this sure looks like it from looking at my engine this morning and reading about it online. I think this is where the mixup has been in this thread, just a simple case of the same part with multiple names.

 

It is the same part, but it has multiple uses / applications... it can be used as the CHTS, or it can be used for the Coolant Temp Sensor... there is either one, or the other on the motor, rarely both as they do the same thing, just from different locations.

Also, I've noticed much confusion in this thread, which has stemmed partially from poor grammar / punctuation. Please be clear when posting, and add question marks (?) when you are asking questions, periods (.) at the end of sentences, and commas (,) between phrases or thoughts.

 

Okay so im ordering the correct part this was getting confusing.So your saying on the VG30ET, that sensor in the link controls both functions from one location?

 

No... it's one or the other... not both. It depends on which ecu you have.

 

You're giving incorrect information and you see grammar as the issue? There is a CHTS on the VG30 engine. It can not be used as a coolant temp sensor.
OP...if you buy a chts then buy it from Nissan. Go to nissanpart.cc, courtesyparts.com, or your local dealer and buy part #22630-01P01.
Check your ecu codes and do some diagnostics before you do anything.
That is a chts and only a chts. It has nothing to do with which ecu is in his car.

 

I ran my codes the other day only thing it threw was 23 and 24 maybe someone could decipher those for me.Other than this spitting and missing cold start issue the engine runs like butter.I really hope this cts(aka)chts irons out the problem

 

oh and on another note are the factory boost gauges known to fail?Mine sits in the lower part of the negative and only reaches about 0 under full throttle and i know im boosting.And ive checked the hoses on the boost sensor and followed it to the mainfold made sure they were tight.

 

Also while im thinking about it,question about the vacuum hoses mounted from the turbo itself.When i bought the car the guy removed his boost controller and it left two long individual vac hoses routed from the turbo area.He connected them using a turn type valve.Does anyone have a schematic on how to bring the turbo wastegate and such hoses back to stock form.I have a feeling that the car may not be boosting to full stock potential with the long hoses on there thank you for your help.

 

23 is TPS. You get that code if you fail to press the gas pedal at the proper time during the test. Test adjustment by checking the top 2 (or bottom 2?) pins on the TPS for continuity when the throttle is closed. Continuity should break when the throttle opens. You can download a free factory service manual hereSee if this helps:

 

you're giving bad info. how can you say that there is not a coolant temp sensor when you have been shown the part number for one? it does exist.