Customer Vehicle: This article is about a 2006 Audi A4 with the 1.8L Turbocharged engine.
Customer complaint: The vehicle had the check engine light on. Diagnosis: We verified the complaint, test drove the vehicle and there was a noticeable lack of power. After much testing and diagnosis we decided to check how much crank case vacuum we had. See the video of us testing the crank case pressure -
0 Comments
My Vehicle: 2000 Saturn SL2
Complaint: Leaking coolant from... Somewhere... Diagnosis: Pressure tested the system and preformed a visual inspection while the system was under pressure. The vehicle we were working on is a 99 Subaru Legacy Wagon 2.2 motor and 5 speed manual trans. The code present was P1507 for the idle air control solenoid. The symptom was intermittent stalling when coming up to a stop light or intermittent hard starting. I had this DTC and wanted to know if or how I could test the IAC before I replaced it. I googled it and after much reading of people who did not have a diagnostic process to their approach and just started throwing parts at it hoping to fix it, I found that it could either be the IAC or a neutral switch causing the problem. Seeing as the IAC is about $180 or more and the switch is $20-30 I decided to do some testing to figure out which it is before I go spending too much money unnecessarily.
I decided to do a thorough write up and explain why sometimes a gear position sensor sets a code for the idle air control in this particular model year Subaru. This is a road test where we monitored Lambda values on a Honda Accord. A/F Lambda reading on the scan tool above 1.0 is lean, rich mix is below 1.0. The computer tries to keep the mixture at 1.0 which is equivalent to 14.7:1 Air fuel ratio. This is a customer vehicle my lab partner and I worked on recently while going to school at BYU-Idaho.
2003 Chevrolet Trailblazer 4wd 4.2L The customer complained of low power and running rough. We attempted to test drive the vehicle and found it would not go over 10mph. The engine would rev high but there was a lack of power. We checked for codes and found several codes: P0495, P0172, P0420, P0756, P1484 |
AuthorWalker Crystal Archives
May 2019
Categories |