View Full Version : Stressed + More engine problems *roll eyes*

04-24-2008, 09:06 PM
89 240sx w/ Red top sr20 S15 t28 turbo FMIC.

i was driving down the street doing 40 or whatever then while cruising I'd be still giving it gas but my rpms would drop, usually down shifting and then shifting back will let me drive again. When I'm shifting and in the time i let go of the gas and hit the clutch etc etc the rpms seem to drop faster than normal. and when im idling at a light or a stop I'll be idling fine for afew seconds then my rpms will drop under 1k and start to try to keep itself alive and the idle will bounce all over the place.

People told me its teh TPS, i ECU checked and it was a 43. I checked the voltage
Closed: 0.0 Volts
Barely pushing on throttle: 2.20 Volts
Holding same position after 5 seconds its springs up to 5.3volts

Everytime the TPS was adjusted it will go back .45 volts it would go back to being off again.

i got the TPS replaced, the TPS was straight from Nissan brand new and it works fine. and it was adjust to .45v and everything was fine. i drove it to portland thought it was all chill but when i got to my second stop light my idle dropped again and i didnt think much when i was in portland i got stuck! My car would try to idle back to normal but instead of bouncing it would just straight die on me. when i tried to start it, the RPMs would go up to 1.5-2k and then drop down and die again. I'd have to give ti gas when starting it so it owuldnt die.

I run and check the TPS everything is good, so i use another one of my multimeters same thing its good. so then not trusting myself i took it to a shop to get a second or third look at it. They same it was perfect and TPS was put it correctly and everything.

Of course everytime my idle would fly around I'd be smoking out the tailpipe and i'd give it gas to keep it from dying and i'd idle between 2-3k , thus causing a GIANT smoke cloud behind me to the unforunately commutors behind me waitting for the light.

Also if im mashing on my car there will be alot of black smoking coming out of my exhaust.

What could be the problem, I was thinking Temp sensor but i didnt know if the sensor would make me loss power while driving. And sometimes before it's warmed up I'd lose power and i'd get the same sypomtoms but not as bad.

This has been going on for awhile now. Afew days ago i installed a oil catch can and made sure the lines were tight, gave a oil cahnge with 10w30 amsoil high performance oil like always w/ OEM filter. and added a ground.

But i feel more lack of power or loss of power and more resistances than usual. I've mounted the catch can between the radiator and the clutch fan. But they do not hit and if they did hit the clutch fan would sit still jsut allowing my engine to over heat.

Any ideas? I've ran ECU check every days and i still get a 55 (normal engine). I tried cleaning my MAFS and it still runs the same

04-24-2008, 09:24 PM
cts? it may be bad, and the ecu is making go into limp home mode and just dumping excessively rich. That kind of explains an unsteady idle, loss of power and smoke, unless its oil smoke.

04-24-2008, 09:30 PM
i dont think its oil smoke when i changed my oil i was still approximately 3.5 qts still.

I also have been getting bad MPG i usually get mpg 25 city now i get like 13-16mpg. probably from the bad idling.

i did my spark plugs last oil change.

04-24-2008, 09:35 PM
try searching cleaning iacv

04-24-2008, 09:40 PM
try searching cleaning iacv

Tried it i cleaned my MAFS and IACV w/ MAFS/TB/Carb Cleaner....Don't help, if anything just delays the inevitable(s/p)

unbolted MAFs w/ phillips and sprayed the sensor and sprayed the hole.

put little straight plastic hose on can of cleaner.

Used pliers to remove teh IVAC adjusting screw (messed up). unloaded all around for roughly 15 seconds.

PS: I've been searching for the last 4 months. I came up with everything i have today. and i've asked other forums to get the same answer or what i';ve already done

04-25-2008, 11:50 AM
coolant temp sensor yo. to the ecu, not the gauge

04-27-2008, 06:05 PM
so i place a order with nissan and the coolant temp sensor will be here tomorrow when i get off work. i understand it just screws in and unplug and a kid can do it with his eye closed.

But i ran through the FSM and looked at my sr and i couldnt find the dang sensor. Since i last posted it has gotten worse and sometimes when warm i can turn my car on and in 2 seconds w.o gasing it, it will low idle till it finally dies.

I search through everything one pointed to the back of the manifold and one pointed to the throttle body. i looked both place and cant find what im looking for.

Can someone else this blind guy with a picture or osmething

04-28-2008, 12:27 AM
it is a little above and to the right of the throttle body. there are 2 sensors. the one of the far right is for the gauge cluster, the one on the left next to it is for the ecu.

04-28-2008, 06:46 AM
check near your tps. there are two sensors. the cts has two wires and the other is for dash temp gauge. that one has one wire.

04-28-2008, 12:15 PM
pull your coldpipe off of the throttle body, the sensor is tough to see with it attached. remove clip, pull old sensor out, install new sensor and see what you get.


04-28-2008, 12:28 PM
just for future references, i believe (correct me if im wrong) that the cts for a ka is the same for an sr. So, you could have gotten it at a parts store instead of going to the stealership.

04-28-2008, 07:48 PM
just for future references, i believe (correct me if im wrong) that the cts for a ka is the same for an sr. So, you could have gotten it at a parts store instead of going to the stealership.

Actually i got my sensor for about 20 bucks shipped. Auto Zone after tax would be 22 bucks here and then + gas etc. so i went OEm and got it for cheaper and dont have to even leave my house only to get the mail

04-28-2008, 08:39 PM
call me stupid and blind but gosh dang it i still cant find it i stuck my hand udner there and cannot feel any wires.

I check under the manifold and felt around. i took a quick pic with my camera phone. if this doenst help someone could you please take a pic of yours and draw a little red circle so my blind ass can see

04-29-2008, 07:50 PM
help Please?

04-29-2008, 08:32 PM
nevermind i think i found it, its on the thermostat housing right?

What are ways that would easiest to get into there?

-under the car and through the buttom across the motor mount?

-From the side and under the manifold?

-Through the front between the housing adn the TPS sensor (which is in my way by the way)

04-30-2008, 06:21 PM
figure out the problem?

05-01-2008, 12:02 AM
yeah thanks man.