Buy Now | Log In | ALLDATA Corporate Site | AutoZone.com
Back To Home Page
Log In To Your Subscription
Go To ALLDATA Back Home
Buy A Subscription! Back Home About ALLDATA Information View Sample Vehicles Read Testimonials View Factory Service Bulletins and Recall Titles Contact Us
Dowload Our Navigation Chart
February 2015: New vehicles added including 2014 GM.
• View New Vehicles
October 2014: Release of 2013 along with initial 2014 Vehicles
• View Vehicles
View All News and Updates:
• Go To News
Tech Tips
  Read All Tech Tips

ALLDATA Tech Articles Are Updated Weekly
• View All Tech Articles

  Dodge Durango: Brake Pulsation Problems In Paul's Durango
• Read Dodge Article
 
Fixing A Smelly Audi Audi Tech Tip: A4 begins to Smell caused by a Faulty Hose Composition
• Read Audi Article
Why Do You Need To Change Your Timing Belt? Why Replace Your Timing Belt
• Read Belt Article
Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
Home >> Featured Tech Articles >> Go Back
   
  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

Miscellaneous
Acura
Audi
Buick
Cadillac
Chevy
Chrysler

Dodge/Plymouth
Ford
GMC
Geo
Hyundai
Honda
Isuzu

Jeep
Lexus
Lincoln - Mercury
Mazda
Mercedes
Mitsubishi
Nissan
Oldsmobile
Pontiac
Saturn
Subaru
Toyota
Volkswagen
 
   
  Jim Grant's Tech Tips

92 Honda Accord EX, Embarrassing Rattle and Idle problems
Q: I have a ‘92 4 door Honda Accord EX with 116k miles on it. It has been a good car except for a few things and I think they might be related. When Idling the car vibrates like crazy! It makes a very embarrassing rattling noise and sometimes while idling the cooling fans will come on and turn off, repeatedly which makes a lot of noise. The RPMS will rise and fall constantly.. anywhere from 400 to 1100 RPMS. I want it very badly to idle constantly at around 800 and not rattle. If you can help me I would be so thankful! I've tried everything and paid everyone to get it fixed but nothing seems to work.......Bobby Byrd

A: More often than not the rattle you’re describing is due to a loose exhaust shield. The vehicle should go up on a lift and the exhaust should be inspected for loose shields or brackets. Usually a little welding or stainless clamps will fix the offending clatter. As for the unstable idle, there may be underlying factors. When the computer in your vehicle senses additional load, something that slows the idle speed, it will compensate by increasing the engine’s idle speed. Additional loads come in different forms, like the electrical load of the cooling fans, rear window de-icer or the A/C system. Most of these components have a direct communication link to the computer to let it know that a decision has been made to activate. The computer knows that additional load is going to be added so, in response, it will elevate the idle speed of the engine. Pretty smart, huh? Well here’s where it gets dumb. All the computer understands is it’s either time to up the idle speed or drop the idle speed. It has no clue that there may be a bad switch causing the system to cycle on and off. A perfect example is a failing cooling fan switch or an A/C system that is low in refrigerant, (note that many A/C systems are activated when the defrost mode is selected at the heater control). It is probable that if you have the cycling cooling fan problem diagnosed you’ll like be on the right track for correcting your unstable idle speed.

 
     
Have any Questions About ALLDATAdiy.com? Please Email Us
Buy Now | Log In | About | Sample Vehicles | Testimonials | Join Affiliate Program