Thanks for the forum... new owner here...

[bookemdano]

I just wanted to say thanks for all the invaluable info I've found here... I had been debating on buying a '94 Q45 that was for sale locally, and after reading a TON of stuff here over the past week, pulled the trigger today.

She only has 99,000 miles, is in incredibly good shape, and even pulled a "disabled parking" placard out of the glove box. She has a rough idle, but thanks to the info I found here, I'm pretty sure I can nail that down with some fuel additive and a new fuel filter.

Anyway, I just wanted to say "hi!" I've never owned an Infiniti before, but dang... what a sweet car! And for $2,800? You gotta be kidding me!

[bookemdano]

Well, I replaced the fuel filter first thing, and topped off the tank with 91 octane, and it sounds better, but I still have that rough idle. Spark plugs are the next thing to get replaced, and I have seen a lot of different opinions here, but which plugs should I be putting in?

I have a gut feeling that the previous owner used 85 octane... just a hunch. Is that something that is pretty common when you come into a used Q45?

[elwesso]

welcome to NICO... more than likely youre going to be looking at injector issues... My first course of action would be to take it out and run it real hard...

[goody90q45]

Let me be the 2nd person to welcome you to NICO. We kept you waiting a while for a response since our long-time self-appoined greeter is on Exile Island for a few days.

Like Wes said you're probably looking at injector issues and now that you've got the additive in use it up quickly and run her hard. A popular fuel additive is 2 bottles of Redline S-1 Fuel System Cleaner in a full tank (or 1 bottle in half a tank). Try it with your next fill up.

It's real easy to ohm test the injectors (and KS while you're there). Start a log and test them every few months keeping an eye out for any injectors that climb above the 10-14 ohms range.



Wes was remiss in not pointing you towards his website Q45.org. It's a great intro into understanding your Q and the tech help section has good articles written by Wes and Jesda as well as many links back to NICO articles and threads.

http://q45.org/

There's many other things to check but ohm testing injectors and KS will tell you a lot.

[paranoidjack]

We kept you waiting a while for a response since our long-time self-appoined greeter is on Exile Island for a few days.

Perhaps the only time I've ever laughed out loud on this forum.

As much guff as people give Brian, he is a useful member to this forum. He's helped me with my car via email on several occasions (but perhaps should be a bit more understanding of what these cars are NOW, and what 99% of them WILL be).

Welcome to NICO! You'll get all the help you ever need here...but before you ask a question, be sure to thoroughly research the FSM as most answers are in there. I'm not referring to this post.

[bookemdano]

This weekend, I have a 600 mile run. I guess I'll know a lot more after that.

Thanks for the welcome, and I am genuinely thankful for the tips. I haven't learned my way around the forum yet, but I DID school a snotty BMW this morning at a stoplight. I guess my problems can't be THAT bad.

PS: always shift to "3" at a stoplight. lol

[bookemdano]

One last introductory question, if I may? How noisy is "too noisy" for a fuel pump? The sound from the back of my car is very noticeable. Time to get a new one?

[Infinitiguy19]

Any time other than when the key is in ACC for 5 seconds or in winter till coolant reaches more than 32*F (a few minutes). You should not hear the pump. I doubt you would even hear it when at WOT (Wide Open Throttle) Because of all the noise the engine makes.

So yes you need a new fuel pump and O-ring.

Welcome to NICO.

[bookemdano]

OK... a new fuel pump. Makes sense...

The last head-scratcher for me is a consistent miss. It seems as if it is only one cylinder. Sparks plug or injector?

Thanks in advance...

[bookemdano]

Yay! Four days- and 500 miles later- after dumping a crudload of Techron additive into the tank and making sure the fuel was 91 octane, tonight, the miss just disappeared, and my Check Engine light went off!

Now I only have that whiny fuel pump and an odd sound down by the alternator to worry about. sigh...