rgus30

welp it always happends to me I put it up for sale and now when its cold out (here in WA st) it spits ans sputters.
first I thought it was the Mas sensor or the other one when it get wet it wont let ya go over 1500 rpm's but for some reason ITS NOT THAT.... crap I am at a lost

I thought it might have been a blowen head gasket but its good nothing wrong there.. oil is good and RAD fluid is good also.

it was running fast and at the top of its game now when I get it out its spittin an sputters all overe the place.
when it warms up and I turn it off and then back on its fine

any sugestions ??

(and BLEACH I am still interesed in the other nissan)

later and confused

NismoPick

Lots-o-threads on here about the same old cold start probs...

like these:

https://www.zdriver.com/forums/showt...highlight=cold

https://www.zdriver.com/forums/showt...highlight=cold

https://www.zdriver.com/forums/showt...highlight=cold

https://www.zdriver.com/forums/showt...highlight=cold

Check your CHTS, AFM, Air Regulator, Cold Start Valve (if non-turbo) and all their wiring connections.

rgus30

OK took it out and blasted down the freeway for a few miles.. first off it acted like it had a plug wire off but after 10 miles or less it started runing fine.
now purring like a cat after about 15 min or more .. I even got to race a buzzin honda and he even seen my tail lights from a large distance and over 100mph WOOSSSSHHH bye bye honda.

ohh TPS was dry as a bone.....

so check plugs and connections.. all the sensors..

its just weird tho all summer long not a prob now this...I think its just me LOL it always happends when stuff for sale...

later

rgus30

one more thing were are all these plugin and sensors.

I know the intake one but the others?

I guess I will have to break out the book... trackit down

later

jfairladyz

Your first concern should be the connector at the Air Regulator on the intake manifold. If this is loose or corroded then the Air Regulator wont work properly. An improperly working Air Regulator will give you the spit and sputter while the engine is cold that smooths out to normal as the temps rise. The fact that the car responds to hot/cold condition of your engine tells me it's most likely not the cylinder head temp sensor (still a possibility though). If cleaning/checking the connector to the Air Regulator doesnt help then the unit itself may be bad. With the engine still cold, like before you start it in the morning remove the hoses to the air regulator and have a look inside the regulator. You should be able to see clear on through to the other side. If the passage is closed, or you can only see a crack of light, then the unit is bad. It should be open in that state. A bad air regulator will cause you to run too rich when the engine is cold because the ECU is dumping in way too much fuel and the air regulator isn't allowing the extra air in to compensate. Its a VERY common failure on the Z's and definitely worth investigating as a likely cause.

EDIT: And take blacks advice and invest in some dielectric grease to seal all those connectors. It's good insurance against future problems.

rgus30

welp i monkeyed with the connections and I dised the battery and after 15 min I pulged it all back in and wallaa it works.
NOW for how long I dont know..

I am going to but the grease on tuesday and go threw all connection

hummm any more sugestions

thanks