Welcome to MBStarTool.com Sign In or Register
Home - Products - Download & Technical Support - What to do when lack of power on a CDI

Search

You can search Download & Technical Support by keyword.

What to do when lack of power on a CDI

Description

It is very often to see that diesels are complained lack of power, or we can regard it as the kick down not working. Today, some tips about this will be shared with you all.

Tools needed:
Star Diagnosis MB SD Connect C4 +DELL D630 Laptop
MB SD C4 + Dell D630
Steps for lack of power on a CDI:
Firstly, do some basic checks like oil levels, fuses etc.

Listen for any escaping air under pressure when you are driving at full load. If this is the case you will probably have a boost pressure leak from somewhere. The common areas are: Intercooler, rubber boost pipes and the inlet manifold itself. If you suspect a boost leak then listen at the front of the engine and see if you can hear where it is coming from while a friend gives the engine some RPM.

The next step is to get it plugged into a Star and get the codes read by Star diagnosis SDconnect c4 bundle. This is the most important thing to do before buying ANY parts. So many people read the forums and assume there car has the same problem as what they have read and replace the same parts and wonder why it hasn't fixed it. Get it plugged in. It will save you ££ in the long run I promise you.

The most common item to fail and nearly always brings up a code is the infamous Air Mass Sensor or MAF (mass air flow). It is always worth doing a manual check with the live data just to be sure that is the cause.

A common fault code from star diagnostic tool is a fault with the boost pressure sensor. It will say either under boosting (lack of turbo pressure) or over boosting (too much turbo pressure). So many people will replace this sensor for this fault when the sensor will be working perfectly. Checking the sensor values with a Star helps determine this. Under boost: Check boost pipes for leakage. Over boost: has it been mapped badly? Is the turbo actuator or vanes sticking?

We see quite a few inlet port shut off motors failing too. The V6 diesel, 220CDI and the 270CDI all suffer. This will give you lack of power when they fail and an engine light will come on in the case of a V6 CDI. A check by sd c4 on a Star will bring up codes for this.

Hope this helps.

Write a Review
* Rating:
    Please select rating stars.
* Your First & Last Name:
* Your E-Mail Address:
* Review Detail:
*Verification Code:
      7586    No right? Get a new Verification Code
 
Tell us what you think about this item and share your opinions with other people. Please make sure your review focuses only on this item. All reviews are moderated and will be reviewed within two business days. Inappropriate reviews will not be posted.
After-sales questions and issues: Contact our Customer Service Department. (A customer representative will get back to you).
Please Sign In first if you want to later edit or manage reviews uploaded by yourself.
Bookmark It