What is a Coldwire Sensor?

1 minuteread

Coldwire Sensor:

The GM LS engine series (as well as others) use a coldwire MAF system (produced by AC Delco) that works similarly to the hot-wire MAF system; however, it uses a further “cold” resistor to live the ambient air and supply a reference for the “hot” resistor element accustomed to measure the airflow.

The mesh on the MAF is employed to smooth airflow to make sure the sensors have the most effective chance of steady reading. It’s not used for measuring the airflow as such. In situations where owners use oiled-gauze air filters, it’s possible for excess oil to coat the MAF sensor and skew its readings. Indeed, General Motors has issued a Technical Service Bulletin, indicating problems from rough idle all way to possible transmission damage resulting from the contaminated sensors.

To clean the fragile MAF sensor components, a selected MAF sensor cleaner or electronics cleaner should be used, not carburetor or brake cleaners, which may be too aggressive chemically. Instead, the liquid phase of MAF sensor cleaners and electronics cleaners is usually supported by hexanes or heptanes with little to no alcohol content and use either dioxide or HFC-152a as aerosol propellants.

The sensors should be gently sprayed from a careful distance to avoid physically damaging them and so allowed to thoroughly dry before reinstalling. Manufacturers claim that an easy but extremely reliable test to confirm correct functionality is to tap the unit with the rear of a screwdriver while the car is running, and if this causes any changes within the output frequency then the unit should be discarded and an aftermarket replacement installed.

A to Z All Answers About Japan Used Cars

Technical FAQ's

Read and learn about car Technical FAQ and get in-depth details of the car features.


Japan Auto Auction

Check out the details and procedure to buy used cars from Japan auto auction.


Japan Used Car Inspection

Read and get instant knowledge about the procedures of Japan used car Inspection.


Overseas Freight

Check out Overseas Freight Rates and Charges Details to import Japan used cars in your country.


Import Documentation

Read about the procedure & documents required while importing used vehicles from Japan.



Check out and read how is shipping done and how a car is being shipped from one country to another country.



Avoid fraud & scams and make a secure payment to import used cars from Japan to anywhere across the globe.


General FAQ's

Read and get the basic knowledge about car maintenance, and in-depth details of cars.


Import Regulations

Check out the rules & regulations in all countries to import Japan used cars.


Japan Used Cars

Check out the details of the best Japan used cars and how to buy them.



Default section for articles.


Previous Post
Next Post

Related Knowledge Base Posts

Leave a Reply

Your email address will not be published. Required fields are marked *

Want to Buy Used Cars from Japan?

More than 70,000 Japanese Used Cars available on sale from trusted Japan Car Exporters

What Is Jct Images


JapaneseCarTrade.com (JCT) the most trusted & free Japan used vehicle portal that connects overseas buyers to Japan used vehicle exporters since 2005.
JCT does not charge any commission, transaction fee or any hidden cost from buyer or exporter. All deals are directly between buyers & exporters that is saves your hard earned money from 10% ~ 50% of car cost.

JCT is associated with JUMVEA (Japan Used Motor Vehicles Exporters Association), SAFE TRADE (JUMVEA Safe Trade for 100% Money Back Guarantee), SLAAJ (Sri Lanka Automobile Exporters Association in Japan) & SLBCJ (Sri Lanka Business Council of Japan) to connect established, trusted & reliable exporters for safe & secured business from Japan.

Welcome to Our Website