Try read the following
ATS Automotive Ezine January 2003 Issue Vol.I No.21
Mailed to you because you asked ATS for assistance with your vehicle problems, you
subscribed to the ATS mailing list OR you are an ATS member. If you want to unsubscribe,
instructions are given below.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
In this issue:
ATS January 2003 Updates
How to test your MAP sensor.
This month's sponsors.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
ATS January 2003 updates
First of all, I want to welcome our new ATS members of 2003! Compared to last year,
more and more are joining ATS, to take advantage of our membership which can
help you fix almost any car problem! It is a LIFETIME membership for 2 vehicles that
you own and you have 90 days to try it.
Also, I would like to thank those members who sent me their fixes after I gave
them the proper tips in fixing their vehicles. Let me give you some
features that I have added to ATS:
Gps supported laptop, which allows us to be in contact with you 7 days a week
More ADDITIONAL common fixes from North American garages PLUS these below:
Engine fault codes meanings and fixes
Email assistance 7 days a week for all your vehicle problems
Pictures, wiring diagrams, engine computer repair info
Service bulletins, manufacturer's recalls
All your sensors checks and fixes
And much much more!
NO Tools and mechanical experience to do repairs?
Share the other membership to a friend who does!
(remember, membership is for 2 vehicles!)
What is a Map sensor?
Sometimes, I get a lot of email complaining about engine hesitation when
accelerating. It is especially noticeable when at stop signs and when trying to take
off after the green light comes on. This MAP sensor plays a major part when your
car is accelerating because it senses the engine load. Monitoring your engine
vacuum does it. As you will know, your vacuum is high when on idle and low when
you rev your engine up. This sensor, through the vacuum hose connected to it,
captures this vacuum state. Here are examples of Map sensors for domestic vehicles:
A typical map sensor on a GM engine. This is usually located on top of your intake or by
the engine firewall.
Here is an actual picture from the Saturn Engine below:
How to test a MAP sensor:
You can easily test this sensor by checking for presence of the vacuum in the hose.
It should suck your finger when you remove the hose if the engine is on idle.
You should feel a decrease in the vacuum when you start to rev up the engine. If
there are no vacuums at idle at all, check the vacuum source and repair if necessary.
You can remove the electrical connection to it and take the vehicle for a road test.
If the problem disappears, replace it but make sure there is a map sensor code
before you unplug the map sensor.
ATS can give you instructions on how to get the code yourself or by using a scanner
without spending a dime! Click Here!
Take a voltage reading of the signal supply wire of the map sensor with your key on
and engine off. (The signal wire wiring diagram will be given to you when you request
for it.) You should get 5 volts. Apply a 10-inch vacuum to the map sensor
and it should drop 1-2 volts. If it does not move, replace the sensor. You can
also observe the voltage reading when the engine is running. All you do is
compare voltage readings during idle and high idle. Again, if there’s no change,
replace the map sensor.
Notes:
Map sensor along with tps sensor are usually called “power” sensors. It’s
because, every time you need acceleration (or power), these sensors are
directly involved. Lots of times, they have the same reference and ground
voltage supply. Thus, if you see a map sensor code, it is wise to check
also the tps sensor and it’s wiring. For example: assuming you have a map sensor
code, it is a good practice to check the tps sensor voltage, the reference
voltage and ground voltage drop. In the past, I have seen problem arising
from a bad reference voltage, which is normally around 5 volts. Upon
checking, I found the reference voltage was 12 volts, which indicates a bad ecu (computer).
On some engines, there are no map sensors. When this happened, manufacturers
use another power sensor called mass sensor. Instead of using a vacuum to measure
your engine load, they use the “mass” of air going thru your air filter ducting.
(this topic was discussed extensively in the past ATS articles).
This month's sponsor:
---------------------------------------------------------------------------------
Our tool supplier Lee Johnson is STILL offering a 10% discount on parts this month.
And the best things is:
Tools delivered anywhere in continental USA!
If interested, please click below:
http://www.wholesale-hand-power-tools.com
---------------------------------------------------------------------------------
Have you checked how much is the garage's rate nowadays? On the average, it is about
$70-$80 an hour. How about the dealer? Roughly about $100! To help you save, ATS
is still at $39.95 and this is for the LIFETIME of 2 of your vehicles!
And if you join ATS today, you can get this
personal guaranty from me:
If you have an engine fault code (after you got it from any Auto Zone), I will fix
it in 5 emails or less or...
If there's no code and problem is intermittent, I will fix it in one week or ATS
membership is FREE! (provided you give all the vehicle info).
To join please click below:
http://www.clickbank.net/sell.cgi?butch0592/1/automotive_troubleshooting_secrets
(you can pay either with credit card or cheque using our secure Merchant Account)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
If there are any questions regarding the above article, please email me at:
jesrtrent@sprint.ca
Happy Troubleshooting,
Rich
