no power after warm up...I'm out of ideas...VG
 

as soon as the car warms up I'm done...injectors are in perfect working order and AI just changed the water temp sensor...what else?

if you got a VG30 check the distrubutor. if you got a VE30 check crank angle sensor

I got the same problem with my 92 VG...

It runs just fine when its cold...but after about 10 min of city driving I run out of power. It feels like when the car gets warm the timing gets retarded big time... It's quite a pain.

I cleaned out the white crap that builds up on the dributor cap points and didn't make a difference.

Is there an easy way to check the coolant temp sensor to make sure it's working correctly?

Try O2 sensor.

when cold it runs fine since the ECU is in open loop.
once the engine warms up (O2 warms up) it goes into close loop and tried to pick up a signal from the O2. If your O2 is lazy or bad then you'll have these problems.

Hmmm....

And if your exhaust manifolds are leaking like mine are im sure that the O2 sensor isn't going to get the correct reading is it? Or would that small amount not affect the sensor?

my rear exhaust manifold just started leaking but I had the problem before...I'll try and swap distributers and I'll see what happens although I checked under the cap and everything seems to be fine and clean...

I took the 02 sensor from my 89 se and the connectors are different. I thought they'd be the same...

if the sensor is bad then u're gonna get bad/no data regardless of leak or no leak

if the sensor is good...and the engine is running correctly, the leak will just drop ur backpressure which also results in power loss but not as dramatic as a bad sensor

have you checked for codes in the computer?

id say get a new knock sensor.. but they are a little over $100 for one

Yeah, and a weekend to install.

I've never heard of a knock sensor going bad on a VG but who knows...what I know though is that I'm done with 3rd gens-they were wonderful cars back in the day but age is killing them. As soon as I fix my problem the car will be gone. The next nissan that I'll drive will have the vq35 in it.Thanks for all your input...

Well this 92 is just my winter car so I only got about a month or so left of driving it....My 02 SE sure doesn't have any power loss when it warms up :cool:

I think im gonna try finding a cheap O2 sensor as well as replace the coolant temp sensor. Along with the million other things I need to do to it...

do the same MY pathy and max take the same sensors?

well?

just replacing parts when they "might" be the problem is a waste of money but if you like wasting it fine

tonight I'll perform the self diag. and see what I'll pull...I'll do this by finding the screw on the ecu by the left passenger leg, right? I know how to read the leds but the last time I tried looking for the screw I found nothing...

the screw can be covered by a piece of tape its clear so just break the tape and the screws right next to the led

update...
 

I should've seen this one coming.....NO STORED CODES(55)...at the time I posted this topic I was about ready to set the car on fire. A week later I bought a 98 altima se to flip, and after driving it for about two weeks I had to sit in the maxima again......i am in love again :) I'll start by checking my timing since I had to pull the distributer when doing the valve cover gaskets...still though, the car was running like this when I got it so I have the feling this is not the problem...may be a tps but no code?well, shiiiiiiiiit

I have no codes stored in the ECU either...55 is the only thing that flashes.

The thought of setting my car on fire has also crossed my mind as well :banghead:

what's bugging me is that code 55 is normal operation-wtmf...aaaah,maximas....

Try testing your knock sensor with a 470k resistor in it's place for a few hours....hopefully this test will help you confirm or eliminate the knock sensor as the culprit...:)

Run some 93 octane during the test to curb detonation....

My car had an exaust leak
right of turbo, before exaust sensor, ran fine for a while, just made extra noise's

as the hole got bigger, the car would slightly overfuel, and make turbo poping noise, untill i fixed the gaskets, then it went back to normal.

Point being, i had a (not so small) exaust leak b4 the sensor and my car still had most/full power...

so a bad o2 sensor can mess up timing a little? cause my car does the same thing. runs smooth cold but warms up and bumps a little with gears.