1992 Infiniti Q45 car starts but dies and fluxuates in RPMs

  • 1992 INFINITI Q45
Engine Performance problem
1992 Infiniti Q45 V8 Two Wheel Drive Automatic 250k miles

I am trying to figure out why my infinity will start every time but will not hold an idle RPM and when I rev the engine it harmonizes at about 3 rpms and runs terrible. If I press the gas harder it will break through and reach higher rpms. If I hold at 5 rpms it will fluxate from about 4.5-5 and just when I think the engine is holding strong during the rev I slowely bring it back down to idle rpms. It may or may not hold for a few seconds and then the rpms drop and it just dies. The car will drive but I have to keep putting it in nuetral and reving the engine to keep it running other wise it will die even when in motion. Please help. I will donate but cant spend alot as I know Im looking at possibly $700 dollars just for parts
Do you
have the same problem?
Thursday, July 29th, 2010 AT 10:36 AM

1 Reply

Hi up-scales,

Thank you for the donation.

When you are not able to hold idle, possible causes are :
1. Clogged idle control air passages. It can be the throttle body and IAC.

2. Bad compression or vast difference between cylinders. Get a compression test done to get the compression readings.

3. Faulty MAF.

Is the Check Engine Light indicating and have you tried to retrieve for trouble codes?
Was this
Thursday, July 29th, 2010 AT 2:22 PM

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