Last post on Dec 04, 2012 at 1:35 PM
You are in the Infiniti Q45
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Infiniti Q45, Sedan
#1 of 318 Do you have a question about Q45s? I can help you!
Sep 12, 2006 (12:36 pm)
I am a nationwide expert on Infiniti's of all generations. Most of my experience deals with the 90-96 models, but I am aware of most common issues and other problems with later models as well...
I have seen there is no real guidance on this forum as far as answering of technical data, so I figured I would offer my help to assist others....
If anyone has any questions, please post in this thead and I will do my best to answer them. you may also send me an email, my email address is in my profile.
Replies to this message:
- miketheeditor (Sep 21, 2006 8:00 am)
- dondre (Oct 02, 2006 5:19 pm)
- pmoonchild (Nov 17, 2006 12:19 pm)
- mythirdq (Jun 19, 2007 1:38 pm)
- kenzel (Jun 21, 2007 11:11 am)
- jimt4 (Jul 01, 2007 3:16 pm)
- mfajardo (Jul 27, 2007 7:30 am)
- mmorgan1 (Jul 28, 2007 8:09 am)
- steveriney (Aug 11, 2007 10:10 am)
- willowork (Aug 19, 2007 2:21 pm)
- cavan004 (Nov 01, 2007 3:26 pm)
- psi4757 (Mar 02, 2008 6:14 pm)
- arisk (Dec 20, 2010 5:46 pm)
#2 of 318 A/C problem
Sep 15, 2006 (2:58 pm)
There are times when no power is received by the A/C unit when initially starting the car. I have to turn off the ignition and restart the car. The restart alwalys seems to work bringing power to the A/C unit. The A/C unit is part of the navigation and radio console. The car is a 2005 Q45.
Once the A/C unit is on there is no problem. Hope you have an answer.
#3 of 318 Re: A/C problem [mlevine]
Sep 18, 2006 (11:56 am)
My guess is a relay is a little funky. Sometimes relays will work occasionally...
#4 of 318 Tachometer Problem
Sep 18, 2006 (8:43 pm)
Hi Elwesso, I have a 95 Q45a. A few months ago the tachometer ceased functioning properly. When the engine starts the tach goes to 1000 rpm and then as I drive it will very slowly keep going until its over 8000 rpm.
Is this a simply repair like a sending unit under the hood, or does it require changing out the dash panel gauges? Thanks!
Sep 19, 2006 (1:09 pm)
So if i understand correctly, the engine RPM is being reported incorrectly.... Meaning that it doesnt rev that high and drives normally, but the tach slowly increases to 8000 RPM (in a fairly linear pattern) after a certain time period of driving....
Does it ever start working normally??
#6 of 318 Re: Tach [elwesso]
Sep 20, 2006 (8:16 pm)
Yes, you are understanding it correctly. The actual engine rpm's don't ever go to 8000 and the car drives normally. Twice the tach very briefly returned to normal operation for a few minutes. When I first start the engine the tach will go to about 1000, then it moves at about the speed of a minute hand on a clock and continues until a physical stop point past 8000.
Obviously with an automatic the tach is not terribly useful, but it bugs me that it is not functioning properly.
#7 of 318 Know nothing except how to drive them
Sep 21, 2006 (8:00 am)
After reviewing other messages, I'm fairly sure the engine mounts on my '90 Q45 need to be replaced (major vibration through teh steering column and floorboards at idle, around 50 mph and again around 70 mph), but let me pose this question:
I recently had a lot of work done on the car (all the hoses and belts, holes in the A/C repaired, etc etc etc), including replacing the oil pan gasket. Would any of that have involved loosening or removing the engine mounts so that maybe the mechanic didn't tighten or replace them properly?
Is there anything that I, a complete neophyte, would be able to spot on visual inspection?
#8 of 318 Re: Tach [knowspinzone]
Sep 21, 2006 (9:29 am)
Alright... ive never heard of that problem before, but I do know the instrument clusters go bad on occasion.
The thing is you can swap each gauge out of your cluster. So if your odometer and speedo still works fine, you can just get a used cluster off ebay (94-96 ONLY) and swap in the tach assy... If that doesnt fix it you have other problems, but its not a hard swap to pull it out.
If you need more step by step procedures and diagrams, please email me since I cant post pictures and diagrams here.... I am more than willing to help.
#9 of 318 Re: Know nothing except how to drive them [miketheeditor]
Sep 21, 2006 (9:42 am)
Technically, there is no oil pan gasket, but that is just semantics... It uses RTV (liquid gasket)... you CAN reseal the oilpan without dropping the Xmember, and you do have to undo the mounts in order to do so....
However, I dont think the mounts are what is causing your vibration... If mounts were a problem, you should be able to recreate it sitting still... What im saying is if it shows up at 50 and 70MPH, rev your motor to those RPMs IN PARK OR NEUTRAL (about 1750 RPM and 2400 RPM, respectively)... if the vibration does not reappear at those RPMs under a no load condition, then its not a mount related thing. 90% of the time mount related problems (for the engine, trans and exhaust) can be replicated under no load condition, but their magnitude may be different... Not always the case when replacing trans mounts which definitely go bad... If your car has over 60k miles, replace the trans mount as preventative maintenance....
Another test for motor mounts is to rev the motor in park... You can actuate the throttle from under the hood... Youll see where the accelerator cable hooks onto the throttle plate on the drivers side... Anyway, rev the motor pretty good (past 4000 PRM or so) a few times in park and the motor should only move an inch or 2... Basically the motor will move a little but not much... If it moves a lot then you have a mount related problem... It would not be a real bad idea to R/R the mounts anyway but i still dont think its related to your vibration... Youll know at that point if your mounts are tight enough...
What hoses did you have replaced. You have more hoses under the hood than you think!!!!!!!!!!!!! If you had truely ALL hoses replaced (about $3000 worth of hoses at wholesale prices) I will be impressed, as its something that should be done....
Anyway, i feel like im really babbling at this point so ill try and wrap this up... Did the car act normally before you had all this junk done?? Unless your "mechanic" is a complete moron, i dont see how you could mess up reinstalling the motor mounts... its held in by 2 nuts on the Xmember...
If you need any other help with this, post up or email me!!
#10 of 318 Re: Tach [elwesso]
Sep 21, 2006 (10:55 am)
You can post pictures and diagrams on your CarSpace page. That way they'll be available if people need them in the future.
We really would rather have the exchanges occur in the discussions instead of off-line. That way all interested parties will benefit.