HI NEWBIE HERE!! NEED SOME HELP

[BAJACALIZ]

HI GUYS,JUST BOUGHT A 91 INFINIT"I" Q45, I HAVE BEEN A NISSAN FAN SINCE MY FIRST 300ZX TURBO (STILL HAVE IT SINCE 8 YEARS AGO NOW WITH 15PSI,). IAM 22 YEAR OLD BUT HAVE ALOT OF EXPERIENCE IN MECHANICAL WORK, I LIVE IN ROSARITO MEXICO (ENGLISH IS NOT TOO GOOD) ABOUT 15 MIN FRON SAN DIEGO AND FOUND THE CAR HERE, PAID 500 DLS FOR IT. HAS "SOME" SERVICE DONE TO IT BUT I HAVENT HAD THE TIME TO GO TO HIS HOUSE TO PICK UP RECORDS, CAR HAS 164,000 MILES .GOT THE CAR HOME AND FIXED ONE FUEL INJECTOR (GREAT SITE YOU GUYS HAVE HERE) HAD TO TAKE OFF THE PLENUM WISH TOOK ME ABOUT 3-4 HOURS FOR THE JOB, I HAD TO DO IT TWICE DO TO A PINCHED O-RING BUT THE ENGINE NOW RUNS GREAT, SO MUCH POWER, NOW THE PROBLEM, EXPERTS PITCH IN, WHEN I BOUGHT THE CAR THE OWNER SAYD THAT THE transmission WAS TAKING A COUPLE OF SECONDS TO ENGAGE TO DRIVE, AFTER A COUPLE OF TIMES 3 DAYS AGO IT STARTED TO TAKE LONGER TILL D WOULD NOT ENGAGE, 321 WOULD WORK BUT IT WOULD SLIP BADLY, NOW WHAT IS WEIRD THAT AFTER I PARKED THE CAR FOR THE DAY IT WOULD WORK JUST FINE WHEN COLD, AND THEN IT WOULD START AGAIN WHEN I WOULD DRIVE IT WARM, NOW I DONT THINK ITS AN INTERNAL MECHANICAL PROBLEM, BECAUSE IT WORKS FINE WHEN COLD IT TAKES ABOUT 4-5 SECONDS TO ENGAGE TO D, I CHANGED THE transmission OIL TODAY AND NOTHING CHANGED, I DISCONECTED THE TCU AND GOT IT INTO SAFE MODE, IF IN SAFE MODE DRIVE WOULD ENGAGE RIGHT AWAY IN 3RD (321 ALSO IN 3) WITH NO DELAY.... WHAT COULD BE THE CAUSES OF THIS? I WAS GOING TO DROP THE transmission BUT I WANT TO DO SOME REASERCHING WITH THE EXPERTS.COULD IT BE INTERNAL DAMAGE? OR A TCU OR TPS PROBLEMS, I KNOW THE transmission HAS A OIL TEMP SENSOR BUT WHAT ITS THE FUNCION OF IT?

SOME PIXS:

MY Z'S

Modified by BAJACALIZ at 10:47 PM 6/25/2008
Modified by BAJACALIZ at 9:57 PM 6/26/2008

[elwesso]

the slipping is what has me concerned. I would consider going to an external cooler, it sounds like a fluid pressure related issue to me!

Its a pretty common problem on Qs as their trans age for drive not to engage immediately when 3-2-1 is fine. I dont know if anyone has actually figured out the problem for sure, but generally people can live with it for a while!

[Q45tech]

Pull pan, clean , replace filter then make sure in rad heat exchanger is not blocked restricted from clutch material then exchange 95% of ATF.

Early transmissions [90-92] were lucky to last 70k most failed and were replaced early, still it was not until 94 that normal life was achieved.

Even with extra cooling and frequent cleaning and ATF replacement 180-200k is extreme long life on these 90-92 units. The 94 redesign bumped this up to 250k if rigorous cleaning standards were followed.

[bullittandy]

How bout some props for the new guy who read before asking and seems to be quite talented.

This one is a keeper!

Sounds like your transmission is on its way out-maybe its slipping when warm after the transmission fluid gets thinner? Regardless, you paid $500 for a pretty clean car and if you were able to pull the plenum then a transmission swap should be easy.

Good luck!

[BAJACALIZ]

THANKS FOR THE FAST RESPONCE AND COMMENTS, IF IAM NOT MISTAKEN THE transmission HAS BEEN CHANGE DUE TO THE DRAIN PLUG IN THE OIL PAN, ALSO IS THE OIL CAPACITY 10Q? CAUSE IN THE transmission OIL CHANGE ONLY ABOU 5Q CAME OUT.

I WILL BE USING THE FSM TO TEST OUT SOME SENSOR, IF NOT I WILL BE REBUIDING IT MYSELF... I ALREADY DID A DODGE CARAVAN transmission BUT ITS NOT AS COMPLEX A A Q45 transmission, THANKS FOR THE HELP AND I WILL HANG OUT HERE FOR A WHILE,

[Q45tech]

Usual short pan drain is ~ 3-4 quarts, the rest is in torue convertor, pump lines and accumulator and line to rad and heat exchanger.

[maxnix]

One thing BAJACALIZ, we are not terminally blind, so PLEASE DON"T SHOUT! Thank you.

One other thing you may want to do is read up on transmission flushes (as they are carelessly called) but are inded mechanical fluid exchanges.

You also might check the lettering on your trunk for the letter "y."

[NightRiderQ45]

Welcome, nice cd/dvd player. Did you put that in yourself? How is the screen resolution for the Boss???

[Q451990]

I suspect the transmission is toast, but I would absolutely drop the pan and change the filter and o-ring, since a clogged filter screen could cause these issues.

You are correct about the drain plug indicating that the transmission was probably replaced at least once.

The double-din DVD radio has a street price of about $300, so your $500 purchase doesn't sound bad at all if it came with the car!

Welcome to NICO!

Heath

[elwesso]

I'm impressed, not that well known that a replaced trans has the drain pan!

Definitely props for doing your homework!

Tech, do you know what design changes they made on the really early transmissions that make them last longer?

Adding an external cooler and changing the fluid again might be worth the money...

[Q45tech]

I SUSPECT that that the PARALLEL DUAL heat exchangers and external fine filter were the bulk of it along with 1st gear start and lower stress from the lower 1st and 2nd gear ratios. Maybe some software/hardware changes in valve body and TCU used to drive it.

Some are easy to implement.

[BAJACALIZ]

Okay, I had to drive the z to work today, i dont like driving it due to the fact that i get in trouble too easy! jejeje

stopped by a transmission shop and was quoted 800dls for a transmission rebuild, guess its a good idea to have a couple grand to have if anything happens, i still need to check the chain guide issue and did a transmission flush btw and didn't change anything, installed a new filter and o ring also and the one use bolts (whats up with that? guess is just to charge more)

i am thinking of selling the q because i saw one for 1800 dls great condition.. even has a new nissan battery replacement its a 94 model and has TCS, it looks very well mantained, but i dont think i can get too much for a non running "q".

The double din unit is a boss dvd player i installed after buying the car, paid 260dls new (wholesale price) it has touch screen,mp3, dvd, remote, reverse cam, front aux input, and usb also installed some top of the line hifonics 6x9 in the back and a pair of 5" in the doors i had to resize the opening for the new speakers to use the original plastic enclosure. the screen resolution is really good i will try to post a pix asap.

I have done alot of reading on this site elwesso, you has some great informative posts.

also i took off the cats because in mexico theres no emission testing... took them to a crap yard and got 160dls each (not bad) now if i could get the transmission working!!!!

I will be instaling a transmission cooler and a 1start TCU as soon as i get it fixed and sell it to get the 94 model (no injector issues i believe)

[BAJACALIZ]

FOUND MY PROBLEM... I WAS TOLD I NEEDED A NEW transmission!!! BUT:

problem: tps sensor!!!

if i disconect the gray conector the transmicion works great but idles high, what now?

[RAP]

Quote from Bajacaliz;

also i took off the cats because in mexico theres no emission testing... took them to a crap yard and got 160dls each (not bad) now if i could get the transmission working!!!!

If anyone wishes to know what the converters (old Q's) are worth: Here is your answer. Crack heads will make their days fix stealing those?

However, I do believe the guy went to a "SCRAP" yard? Then again, things may be different in Mexico?

[mcrews]

One thing BAJACALIZ, we are not terminally blind, so PLEASE DON"T SHOUT! Thank you.

One other thing you may want to do is read up on transmission flushes (as they are carelessly called) but are inded mechanical fluid exchanges.

You also might check the lettering on your trunk for the letter "y."

Welcome to the site!you have learned a few things and you posted a great thought - out problem

You will learn to ignore Maxnix....He'll ***** like an old lady about spelling Infiniti wrong (to all the newbies.....) but then he can't spell the word "INDEED"

indeed.

ps. if you want to type in all CAPS, don't worry. we don't think you are really shouting.

[BAJACALIZ]

jeje i know, i just wrote the whole thing in caps and didn't want to rewrite everything ...i changed tps sensor but transmicion is leaking oil from the bellhousing maybe its the converter or a seal, i will be removing the trans. tomorrow to fix it.

and RAP i meant "scrap yard" its actualy a recycling plant here in TJ mexico,

THANKS ALL FOR THE WELCOME, THIS IS A GREAT FORUM, i hope i learn enough to help others like i do in z31performance.com, i just want to fix my Q i never new about these cars but after coming to nico and buying one iam in love with them, its such a fast car for its size and weight and they feel so solid, here in Baja Califonia they are really cheap due to the fact that they are not allowed to be imported to mexico (dont know why, but some cars just are not allowed)

[RAP]

, its such a fast car for its size and weight and they feel so solid, here in Baja Califonia they are really cheap due to the fact that they are not allowed to be imported to mexico (dont know why, but some cars just are not allowed)

Why can't you import your old car into Mexico? Well I think that Mexico does not want to become a big auto scrap yard with our discards, is why. Mexico does have a rather substantial auto manufacturing industry also.

You can import up to date cars into Mexico though. I think that a less then 10 year old car imported into Mexico by a Mexican citizen must have certain taxes paid: Import tax, value added tax, and probably other taxes also. You can probably obtain all this information from the local TJ office of "la duana, a la frontera or by doing a search on the internet, maybe? Why don't you go there and let us know. Who knows, there may well be a big American exodus of citizens making the move to Mexico because of cheap GAZ ? ? ? ME, well I would like to live in Mexico not for the gas but for the Negra Modelo? ? ? and nice senoritas ? ? ?

I work with Mexicans, H2B visa workers, and they buy cars and trucks here to bring back home and they know which year models are tax free or minimum taxes. Some guys make good deals here and re-sell in Mexico. They like small pick-ups, Rangers, Nissans, Chevvy S10's and small vans US made. They don't go much for anything Japanese except Nissan and nothing from Europe. They like Fords and Chevvys! ! ! and Fords and Chevvys ! ! ! or GM products. Also Jeeps cherokee but not overly so.

You will have to buy a less then 10 year old Infinity Q45, and, they are cheap and getting cheaper. So when your un-importable Infinity Q45"craps" out for good just go buy a nice low mileage 2000 or so then you can drive around TJ in style and really score with the chicas? ? ?hmmm

Have fun

Jack

[mcrews]

Bajacali

What size are the tires on the grey turbo z??the rears really fill the wheel well nicely!

[BAJACALIZ]

iam running some 295/50-15 they are "really wide" but i still dont get any grip, only using slicks.