93 Q45 reving over 1k rpm

A Q45 forum / Cima forum for the President of Infiniti's lineup. Brought to you by Infiniti Parts USA, your OEM source for Q45 parts!
User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

When in park it usually does go high then slide itself down.When ran real hard it would rev 1500-2000rpm then drop at some point or it'd start the car back up and it would disappear.Now te car just wont rev under 1k at all.Any ideas?oil maybe?Or something else?Let me know asap because I will be doing my pulleys some time soon too.Thanks.


User avatar
Infinitiguy19
Posts: 7787
Joined: Sat Dec 22, 2007 4:58 pm
Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles

Post

Has the little bolt on the throttle body ever been touched?

Was the MAF ever cleaned?

How is the MAF connector?

If you wiggle the connector does anything change?

When was the last time the spark plugs were changes?

What brand and kind are the current spark plugs?

What do all Injectors OHM at?

While your there test the knock sensors too.

Is that the idle RPM when the car is fully warmed up?

Has the IAC screw ever been touched?

User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

ppastos wrote:Has the little bolt on the throttle body ever been touched?

1.Was the MAF ever cleaned?

2.How is the MAF connector?

3.If you wiggle the connector does anything change?

4.When was the last time the spark plugs were changes?

5.What brand and kind are the current spark plugs?

6.What do all Injectors OHM at?

7.While your there test the knock sensors too.

8.Is that the idle RPM when the car is fully warmed up?

9.Has the IAC screw ever been touched?
To answer 1-7 I'll be doing all of these,meaning checking them, on thursday.

The idle is for fully warmed up.

Since I will inspect my belts and pulleys anything else i should check other than these things you say?

TBrack
Posts: 1217
Joined: Sat Oct 22, 2005 9:08 am
Car: none
Location: Knoxville, TN

Post

unknown007 wrote:When in park it usually does go high then slide itself down.When ran real hard it would rev 1500-2000rpm then drop at some point or it'd start the car back up and it would disappear.Now te car just wont rev under 1k at all.Any ideas?oil maybe?Or something else?Let me know asap because I will be doing my pulleys some time soon too.Thanks.
Ditch that thing and get a Versa

Fuel economy ftw, that's why I walk or bum a ride from my woman every day now

User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

lasoyafan wrote:
Ditch that thing and get a Versa

Fuel economy ftw, that's why I walk or bum a ride from my woman every day now
Versa huh?Dunno what that is hahaha but gas is dope price well last time i check $2.91 premium.

TBrack
Posts: 1217
Joined: Sat Oct 22, 2005 9:08 am
Car: none
Location: Knoxville, TN

Post

I pay about 2.29 here for ethanol free 93

User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

This morning when i got to my school it was reving above 1k now t revs nice and quite what might it be?

I just noticed when i turn left the right i hear a click seems or sounds like something hitting the steering column?

User avatar
Infinitiguy19
Posts: 7787
Joined: Sat Dec 22, 2007 4:58 pm
Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles

Post

I suspect a MAF issue for the idle.

Also have a MAF for sale if interested.

Check the Rack and the fluid for it.

Look for ripped, dry rotting dust boots for the Rack.

Look and smell of PS fluid.

When does it make the sound EX: at idle, when driving...


User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

ppastos wrote:I suspect a MAF issue for the idle.

Also have a MAF for sale if interested.

Check the Rack and the fluid for it.

Look for ripped, dry rotting dust boots for the Rack.

Look and smell of PS fluid.

When does it make the sound EX: at idle, when driving...
Park idle,drive idle and thats it.I remember looking somewhere on how to clean the MAF sensor maybe that would be it?

Where's the boots for the rack or what's it called?Thanks.

User avatar
Infinitiguy19
Posts: 7787
Joined: Sat Dec 22, 2007 4:58 pm
Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles

Post

Here is how to clean the MAF: http://q45.org/maf.html

Also on the MAF look at the connector and pins and see if there "straight like a square" Never thought I would say that, And its an Oxymoron.

Just look under your car at the front wheels, have them straight

Have them turned to the left and look at the right boot

Then turn to the right and look at the left boot.

Then touch the boot and look to see if its cracked or broken.

If so repair immediately, then flush PS fluid to get all the crap that been sucked in to the system from not protection.

User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

ppastos wrote:Here is how to clean the MAF: http://q45.org/maf.html

Also on the MAF look at the connector and pins and see if there "straight like a square" Never thought I would say that, And its an Oxymoron.

Just look under your car at the front wheels, have them straight

Have them turned to the left and look at the right boot

Then turn to the right and look at the left boot.

Then touch the boot and look to see if its cracked or broken.

If so repair immediately, then flush PS fluid to get all the crap that been sucked in to the system from not protection.
You know what i deserve to be called the most irresponsible person right now.Awhile back i hit a curb and my boot tore up.This was in June or something.I forgot about it ever since.I'll repair ASAP. Im so mad now F**K!!!!

Thanks very much for reminding me.Im sure that's it.The PS fluid would be power steering fluid?

User avatar
Infinitiguy19
Posts: 7787
Joined: Sat Dec 22, 2007 4:58 pm
Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles

Post

Yea PS fluid means power steering fluid.

I don't judge people or try not to some times.

But that sucks big time how do you know that you just tore up the boot and didn't bend anything?

Should have it looked at it ASAP.

I have a 1991 Q45 rack that I took of the other 1991 Q45 But I am saving it for my Q to put in some day, But if you need Baaad then I might give it up.

User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

ppastos wrote:Yea PS fluid means power steering fluid.

I don't judge people or try not to some times.

But that sucks big time how do you know that you just tore up the boot and didn't bend anything?

Should have it looked at it ASAP.

I have a 1991 Q45 rack that I took of the other 1991 Q45 But I am saving it for my Q to put in some day, But if you need Baaad then I might give it up.
We had a legit mechanic look at it.He been fixing my dads cars for years and done engine swaps for him etc.So thats about it how much are the boots any idea?Might as well replace both?

maxnix
Posts: 22627
Joined: Mon Jul 22, 2002 8:11 pm
Car: 1995 Infiniti Q45
1995 Infiniti Q45t
2000 Infiniti Q45

Post

http://www.infintipartsusa.com

Grab some filters also and get an alignment.

User avatar
Infinitiguy19
Posts: 7787
Joined: Sat Dec 22, 2007 4:58 pm
Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles

Post

Boots are $20 each from IOS, you need 2 so $40

[email protected]
Posts: 1
Joined: Thu Nov 13, 2008 10:52 am
Car: 1994 Infinity Q45/2004 Nissan Titan

Post

My '94 was doing the same thing. Could not figure it out, but it finally got bad enough the engine would barely run. This went on for about a year. It was a bad injector. The car would not idle under 1K, and finally the injector jammed open and was flooding the engine so bad that I could barely get it to the shop. To replace the injector was around $850 total---most of it labor because the intake manifold has to be pulled to get to the injectors.

User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

[email protected] wrote:My '94 was doing the same thing. Could not figure it out, but it finally got bad enough the engine would barely run. This went on for about a year. It was a bad injector. The car would not idle under 1K, and finally the injector jammed open and was flooding the engine so bad that I could barely get it to the shop. To replace the injector was around $850 total---most of it labor because the intake manifold has to be pulled to get to the injectors.
Dont scare me. Well I'll be tlaking to my teacher to see if we can do all this to get to my injectors. What should all injectors Ohm at?

User avatar
Infinitiguy19
Posts: 7787
Joined: Sat Dec 22, 2007 4:58 pm
Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles

Post


User avatar
unknown007
Posts: 1907
Joined: Sun Nov 04, 2007 10:07 pm
Car: White 1993 Q45 (G50)

Post

I knew that.


Return to “Q45 Forum / Cima Forum”