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Harsh shifting on Toyota RAV automatic transmission and problem repair

Posted by Richard 26 July, 2010 (1) Comment
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If you own a 2001, 2002 or 2003 Toyota RAV4 vehicle and you are having problems with the automatic transmission, which symptoms are harsh shifting, loss of power, launching on second or third gear and/or hard engagement when it is put in reverse, then you should know that those problems are caused by a defective engine computer, which also controls the automatic transmission.

These problems are erratic and may only show at intermittent intervals or when the vehicle is warm or have been driven for a specific time. Sometimes it happens one day and the next morning it does not show.

When the computer (ecm or ecu) is defective, it will Read the rest of this entry

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My car engine hesitates when I accelerate!

Posted by Richard 9 July, 2010 (0) Comment
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Quick and easy solution for curing the annoying hesitation, jittering, lag back feeling, stalling or whatever you wish to call it, which happens when you are accelerating your car.

(Note: While this article is dedicated to the Toyota Corolla late models, this will apply to most cars equipped with a MAF or flow meter sensor, either from Toyota or any other brand, like Nissan, Mitsubishi, etc.)

If you own a 2004, 2005, 2006 or 2007 Toyota Corolla and your car hesitates when you accelerate or it hesitates when driving, you should try the solution described here. Below is a list of the behavior your car may show that tells that you should try this procedure before going to a mechanic or repair shop.

  • The accelerator is slightly pressed while the car is running and it slightly jitters or hesitates
  • After completely stopping the car (a red light for example), it hesitates when you accelerate to continue driving
  • Engine power is below the usual level
  • Sometimes check engine light turns on

You should know that while those problems can be Read the rest of this entry

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Simple Resistor Color Code Calculator

Posted by Richard 3 June, 2010 (2) Comment
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Having hard times with the resistors color code? Then, while you learn it, you might find useful this simple calculator, which will either find the colors representing a given value of resistance or the resistance value in ohms for a given color set.

This is for 4-color rings resistors, either rated at 5% or 10% tolerance. It will not calculate the precision 5-color bands resistors having a tolerance of 1%.

The color ring for tolerance, which is the fourth one, either gold or silver colored, is ignored here since it is not critical on most applications. It basically tells that the represented value in colors, may vary for a range of a 10% (from -5% to +5%) from the actual value if this ring is gold colored, and 20% (-10% to +10%) if it is silver colored. Most modern regular resistors are marked as 5% tolerance (gold), which is fairly acceptable.

(NOTE: Will not work with Internet Explorer version 6 or earlier)

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1992 – 1995 JDM Honda Computers Performance Chip Installation

Posted by Richard 6 February, 2010 (14) Comment
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This covers the Honda JDM “P72“, “P30” and “P08“.

Installing a performance chip on 1992-1995 Honda JDM computers uses the same method as described on other posts on this website. You may use the search function above for those other publications. What differentiate the installation on JDM ecus from USDM, Canadian, European, Australian and some others, is the need of installing Surface-Mount-Devices (SMD’s). The same installation kit of the P28 and other OBD-I Civic / Integra ecus is needed, but the parts are smaller. These parts are; the 74HC373 chip, the “J1″ jumper and the two bypass capacitors, which instead of being a through-hole mounting devices, these are soldered on the surface of the circuit board. They are smaller and a little bit more difficult than their counter parts, but still, it is a simple job. The resistor “R54″ is not needed on this installation and the two capacitors are optional, so the jumper and 74HC373 latch chip will be depicted only.

Here is a picture of the 74HC373 SMD Chip

SMD 74HC373 IC Chip

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1988 – 1991 Honda Civic / CRX Performance chip Installation

Posted by Richard 6 February, 2010 (0) Comment
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This is the following Honda ecu computers: PM6, PW0, PR3 (OBD-0) and PR4 (OBD-0).

Installing a performance chip on 1988 -1991 Honda Civic / CRX is a single procedure that consists of removing the stock chip, soldering a socket in place and inserting the performance chip on the socket. This instructions are similar to the instructions for installing a performance chip on OBD-I Accord and Prelude elsewhere on this website.

Different from the OBD-I Civic and Integra ecus, which you must add Read the rest of this entry

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