1995 nissan altima....

[1995altima]

hi, my name is mike. me and my wife just recently bought a 95 nissan gxeit is a late 94 (dont know if that will help in my question) onto the problemit stalls when comming to a stop and has unstable idle. it seems to get worse when hot. has check engine light codes say 1. ignition coil 2.knock sensor 3. 2nd gear shift incorrect 4. 3rd gear shift incorrect . ive replace the coil , spark plugs and wires, cap and rotor temp sensor fuel filter ,fuel.

after replacing the temp sensor the car ran good for about 10 min then ran even worse.

any suggestions please help, thanks in advance.

[1995altima]

update.... i replace the coolant temp sensor. it only seems to do it after car warms up ???????

[Cyclemut]

Sounds like a failing IACV (Idle Air Control Valve). Or possibly even a bad MAF (Mass Air Flow) sensor.

How do the plugs look? What brand, and are they black (rich)? Can you save the idle by giving it a little gas? Are there any other symptoms? Does it drive normally, other than that issue?

[3Q Jay]

Mike- what is the maintenance history of the car?

here's my photo essay on how to keep your U13 intake nice and clean......

zerothread/228516

the knock sensor is clearly visible in the last picture.

i'm in cocoa beach for a few days if you wanna bring it by for a quick look over.

[3Q Jay]

also, what did the inside of your distibuter cap look like when you pulled it? did you pull the rotor, 'weather seal donut' and look for oil tracking?

these are famous for leaking distributors that wreak havoc with idle.

[1995altima]

sorry guys ive been working alot so havent got a chance to get on here or work on the car untill today . so far ive replace the KS and the coolant sensor. still no luck.

GQ - the car would not make it down to cocoa , but thanks.

as far as maint. goes i just bought the car so i dont know the history.

ill look at the dist. here in a sec. and check that seal.

the car still dies out and idle is reving up trying to save its self. it seems to do it hot and cold.

[Cyclemut]

See if it straightens out by pulling the connecter off of the mass air flow sensor (MAFS).

Stop the engine, unplug the sensor and restart it. See what it does then. The computer will go into a limp mode, causing it to not go above 2500rpm. But if it idles smoothly, then you're dealing with either a bad MAFS or a dirty MAFS.

Still look under the cap of the distributor for oil. But typically, that would cause a non-running issue vs. a hunting idle.

Either a failing IACV or something else I would think would cause this issue.