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Infiniti Q45 Maintenance and Repair

248 messages,  Last post on Nov 30, 2009 at 8:54 AM

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#238 of 248 97 Q45 misfire by tarkar Oct 04, 2009 (5:34 pm)
I have a 97 infiniti Q45 that I may have to get rid of due to excessive repair costs. I have recently replaced all 8 fuel injectors and 2 knock sensors. The problem is that the car more often than not runs with a lack of power, but no other conditions. It occasionally misfires when idling. When driving the car and removing foot from gas pedal and then trying to accelerate, the engine will shake violently. It then is almost impossible to get the car to increase speed regardless of how much you push the accelerator. Once you pull off to the side of the road, the SLIP, TCS and CHECK ENGINE lights come one before the car stalls. My mechanic says the fault code is the air mass meter. Tried replacing it, but problem got worse. When you restart the car, it may run alright (still lack of power) or it may stall again. You may have to turn the car on and off several times before it will run acceptably. The problem seems to be worse when the fuel tank is low, or after a long downhill section of the road. Also, the car may run for a week between the violent "misfires". Any help would be greatly appreciated. By the way, before I replaced the fuel injectors, I had the local dealership diagnose my problem, and they recommended the injector replacement. Replies to this message: walis (Oct 05, 2009 3:51 am) sidwell (Oct 06, 2009 7:23 am)
#239 of 248 Re: 97 Q45 misfire [tarkar] by walis Oct 05, 2009 (3:51 am)
Replying to: tarkar (Oct 04, 2009 5:34 pm) I had the same problem for a while. I did everything from changing all 8 spark plugs, all injectors, air flow meter, egr valve, etc...none fixed the issue. So one day I decided to re-visit the spark plugs but this time I pulled apart the boots and the coil packs one at a time...VOILA...THERE...one of the coil packs had a tiny amount of oil right where the contact is...so that was oreventing it from sparking. I spray cleaned it and all other seven (just to be certain), let them dry and re-installed all. The car has been running like a wild horse on cocaine since then...I LOVE MY Q! One note...to maintain a Q, it helps to be handy or else you'll spend a lot of money. Replies to this message: sidwell (Oct 06, 2009 7:23 am)
#240 of 248 Re: 97 Q45 misfire [walis] by sidwell Oct 06, 2009 (7:23 am)
Replying to: walis (Oct 05, 2009 3:51 am) I had a terrible problem with my 2001 Q45, with symptoms very much like those above. It even shifted gears poorly, if at all. A friend at a gas station hooked up his OBD Reader and got back Oxygen sensor problems and 3rd gear problems. I bought some catalyst cleaner from JC Whitney and put it in the gas. It stopped most of the problems immediately! The remaining problem is that when it starts it kinda lopes idling until I step on the gas and then it quits. It doesn't lope at traffic lights or other stops, just when I first start it it. Even if I drive a few miles and park it, it will still lope when first restarted.   Any ideas? (I swear that cat cleaner worked wonders!) Bil
#241 of 248 98 Q45 brake and check engine light by aircalgal Oct 10, 2009 (5:30 pm)
My brake light has been going off and on for some time. Now the check engine light is coming on. The car has been serviced, so there is nothing wrong. Do I need a new sensor or could it be the alternator. If it is a sensor, how much does that cost. Replies to this message: sidwell (Oct 11, 2009 7:08 am)
#242 of 248 Re: 98 Q45 brake and check engine light [aircalgal] by sidwell Oct 11, 2009 (7:08 am)
Replying to: aircalgal (Oct 10, 2009 5:30 pm) My experience with Japanese cars is that when the alternator starts going bad, it first affects the sensors, causing the warning lights to come on. I've owned Japanese cars since my first 280ZX (first of four ZXs). Only problems were with alternators failing, like on my current car, a '01 Q45 Anniversary Sports model. Good luck, Bil
#243 of 248 2 questions 1999 Q45 by norwesterner Nov 10, 2009 (8:58 pm)
Question 1. Low beam headlight. How do I change it? From the front or back? From the back there is a wire that pops off but can't seem to remove the light, not sure it is the correct light anyway, it is next to a 2 inch round plastic unit with fins on it.    Question 2. When I am sitting a red light the engine starts missing and then when I start moving it misses for about the first 100 feet or so.    Any suggestions? Thanks Replies to this message: sidwell (Nov 16, 2009 10:46 am)
#244 of 248 Re: 2 questions 1999 Q45 [norwesterner] by sidwell Nov 16, 2009 (10:46 am)
Replying to: norwesterner (Nov 10, 2009 8:58 pm) Question 1: I dunno Question 2: My 2001 Q45 "lopes" at idle, some of the time. A reading of the trouble code shows low fuel pressure. I'm waiting on delivery of the fuel pressure part now. Sure hope thats it.... If yours is a true "miss" it could be one of the plug wires. I had one go bad and they short out against the tube they sit in. Unfortunately, even though the wire is replaceable, it is not offered as a part. Had to buy the whole part. Bil
#245 of 248 03 Q45 Navigation and Info screen went dark. by cobrapc Nov 24, 2009 (10:32 am)
My 03 Q45 navigation and information screen went dark. The stereo and blower were still working at the settings they were at when it went dark, but no control buttons function. I couldn't find any blown fuses, nor could I find any listed as navigation or info center. Any ideas?
#246 of 248 spark plugs and unleaded gas by egypt25 Nov 24, 2009 (11:15 am)
i just found out that the previous owner was using unleaded full in my 96 q45 infiniti. i also used it(twice). will it be fine for me to drive my car until the end of december, because i wont have the money to have the spark plugs changed until then. oh and i will use premium gas unil i have it repaired
#247 of 248 Catalyst Question by qinquirer Nov 30, 2009 (7:21 am)
Considering purchasing an 02 Q45. History shows "CATS are deteriorating" and "Needs catalyst." What does the catalyst do? Is this repair expensive? I would like to factor possible repair costs in as I negotiate the price on the car. Thanks. Replies to this message: sidwell (Nov 30, 2009 8:54 am)

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