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Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Oldsmobile
Satisfied Customers: 48654
Experience:  16 years of experience
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Driving engine will miss and the tach will to 8,000 on gauge

Customer Question

Driving engine will miss and the tach will to 8,000 on gauge only not rpm
JA: How many miles are on the car? Is it an automatic or a manual transmission?
Customer: 120,300
JA: What year is your 300?
Customer: 123,000 is the mileage
JA: What is the make/model/year of your car?
Customer: It is a 2002 olds aurora
JA: Are you fixing your Aurora yourself? What have you tried so far?
Customer: Just started so I haven't done anything yet.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I don't think so.
Submitted: 11 months ago.
Category: Oldsmobile
Expert:  Chris (aka-Moose) replied 11 months ago.

Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.

  • Sorry no one has helped yet for the question fees you have already paid.
  • This Sunday I will be online later than normal due to travelling.
  • I can help with this question.
  • Reply and let me know when your able to work on this concern.
Customer: replied 11 months ago.
On the way to Church now, will be home 11:30 centeral time. KC Mo.
Expert:  Chris (aka-Moose) replied 11 months ago.

Are you saying the tachometer shows the engine has reved up to 8000 rpms?

Is this misfire felt at idle?

Any trouble codes stored?

Customer: replied 11 months ago.
I have felt the misfire only when diving and driving RPM, it goes to 8,000. Then it will go down to about 4.000 at idle.
Seems like the idle RPM goes lower and sometimes dies at a stop light. Don't know if it makes a difference, but it is a V-6.
I haven't had it in to hook up to read the codes. Let me know if you have any more questions let me know.
Will be taking it in to a shop Friday.
Expert:  Chris (aka-Moose) replied 11 months ago.

I think your reading the tachometer incorrect. Normal idle is 750. Nascars run at full speed about 8000. I believe you mean, its dropping down to 400 rpms at idle when its misfiring. Low idle issues alone are related to a dirty air fuel sensor, dirty throttle body or faulty idle air control. Sometimes a misfire is as simple as the vehicle just needing a tuneup.


Thanks for letting me help you & for leaving me a ~5 STAR EXCELLENT~rating when ready. Rating results in the website paying me from the question fee you have already paid. Although I appreciate customers saying "Thank You" that alone does not result in me being compensated if you were pleased.

Thanks Chris

Customer: replied 11 months ago.
Wrong. At least about read the tachometer reading. I didn't say the motor was running a 8,000 RPM"s. Tha tach shows about 2,000 at highway speed. I can feel the misfire or hesitation, seem more in city driving, then the needle of the tach
goes to the peg at 8,000. Just the techometer, not the motor's RPM's. As I slow down the tach will go back to about 4,000.
If I stop and turn of the engine and restart, it go back to normal.
Expert:  Chris (aka-Moose) replied 11 months ago.

Okay I understand now.

A scan tool is needed to see if the PCM shows this high rpm reading. If it shows accurate but the tachometer in the instrument cluster does not then the instrument cluster is faulty for the tachometer reading incorrect.

Expert:  Chris (aka-Moose) replied 11 months ago.

Hello again Chris here,

  • Sorry you were not pleased with my help.
  • What would you like to do regarding your question now.
  • This post is coming up on the 7 day mark where it times out. When a post times out, that means it's no longer on my active list (you reply and I may never know it.)

Thanks Chris

Customer: replied 11 months ago.
I can't see that you have answered my question, maybe is a hard question to answer.
Anyway I would like for you to remove any charges you have put on my credit card.
Bruce Lunsford
Expert:  Chris (aka-Moose) replied 11 months ago.

I have nothing to do with the fees. Use the contact us link at the bottom of the page to discuss that with the website.