Master 77c385ec3dad981443cd9a5b509db22a5a3fa078fc8c154e2bda5f4630ddae75Master
1468 points
I've been a professional mechanic/technican since the late '70s and now I own my shop and specialize in electronics and computer control diagnostics on American and most Asian vehicles. I supplement my own training and even my shop by traveling around the country as a continuing educational instructor. My image is a compression test on a Volvo S40 using a pressure transducer and it shows the exhaust camshaft incorrectly over advanced. Check out my blog, "Autotechtitude" at In my blog I'll take you inside the world of today's diagnostic technician and you will see the tools, strategies, triumphs, and of course some of the lessons that are learned the hard way that every technician experiences.
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Question Answered: How to fix a no crank no start?
April 04, 2015, 06:20 PM
A grocery list of the possibilities isn't what you need. You could guess a thousand dollars worth of parts without fixing this. Shops don't just say that there is nothing wrong, they know there has to be a problem with the car otherwise you wouldn't have brought it in. When a problem is random in nature there can be some clues that can help narrow the focus but even then it isn't a good idea to shoot from the hip, problems like this take a good game plan performed by a patient, trained specialist. One routine is labor intensive and that means connecting all of the required testing equipment and being ready to attack the problem when it occurs having pre-planned the testing routine. Another is to make themselves available to have someone drop what they are doing and come to you as long as you are close enough to them when the problem occurs so that they have a chance to start the diagnostics and begin to narrow the focus on the issue before the vehicle manages to start.
Question Answered: I have Error code p2271
April 02, 2015, 07:42 PM
The code description is O2 sensor stuck (biased ) rich, which would be a high voltage bank #1 sensor 2 as you correctly identified. It's noteworthy however that this code isn't listed for your vehicle in service information. Bank#1 is the passengers side (right hand) and the down stream sensor is after the catalyst near the transmission on the passengers side.
Question Answered: My airbag light came on will GM replace this at no cost to me?
March 16, 2015, 10:34 AM
The airbag light coming on means the computer see's something wrong with the system and it needs to be diagnosed. The first step is to retrieve the trouble code that the control module has set and then the tech has to test the circuit that the code was generated for the same way that the module tested the circuit. It is unlikely that this is going to be for free and it is up to you to have the system repaired ASAP because it is a safety system.
Question Answered: After recall for excessive key weight car still stalls while driving.
March 12, 2015, 10:07 AM
The recall dealt with the mechanical aspects of the lock cylinder being able to be turned easily under certain circumstances and essentially allowing the car to be turned off, not "stalling". The symptom you are describing has to be analyzed during an event and it often happens that it may take a number of events during which a technician makes strategic measurements in order to prove what part of the engine control system is causing the problem. It can be very tedious work and it requires that the technician have a very patient, disciplined approach. This kind of problem can be the most difficult to solve that a technician ever deals with, and oddly enough they are rarely paid for the time that they spend doing so and that's why they have stopped investigating it. Nobody can reliably just guess what is happening, it must be proven.
Question Answered: downstream o2 senser wiring rubed off male end need a color diagram to reconnect
March 12, 2015, 09:54 AM
An O2 sensor gets its reference Oxygen by absorbing it through its wiring insulation. If that is damaged it can have an impact on the sensors accuracy so they should not be repaired, it needs to be replaced.
Question Answered: engine malfunction light still on
March 11, 2015, 09:48 PM
What code is setting? Does the light come on right away or after you drive for a while, or does it take more than one trip?
Question Answered: I lost one key and need another onE. I have AN AUTOMATIC STARTER. How much
March 04, 2015, 05:26 AM
That's not just the price of one key, the vehicle must be trained to accept the security identification code that the key sends out.
Question Answered: Does the ignition recall cause my car not to start?
March 04, 2015, 05:24 AM
No the recall would not have anything to do with a no-start like this.
Question Answered: 1u411 and abs,esp,traction control lights
March 04, 2015, 05:23 AM
Maybe that is supposed to be U1411? If you are using a remote start the instrument cluster might not be turning on and you end up with the engine running while the computer thinks there is no fuel in the tank. Therefore "fuel level implausible" which is what the code means results. There are of course other issues that can happen such as data-bus communications failures or loss of the fuel level signal. More diagnostics with a professional level scan tool may be required.
Question Answered: My engine light came on but after I filled tires it went out still did diagnostic check P0316 and P0302 showed what are they and how much should it cost?
March 04, 2015, 05:15 AM
P0316 is misfires detected in the first 1000 crank revolutions after start-up, so that means the computer was detecting misfires in the first 30 seconds or so after a cold start. The P0302 is a misfire detected in cylinder #2 and that would have to be diagnosed.
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Comment: Right to Repair
November 15, 2013, 04:00 PM
Its been over a year, what changes have occurred since the legislation passed?
Comment: How Does GPS Work?
November 15, 2013, 03:51 PM
I've often fancied the idea of having someone like George Carlin (rip) as the voice and talent for providing directions and the inevitable recalculation. I doubt he'd be able to hide his disdain for failing to follow his directions......
Comment: Cars That Drive Themselves
October 25, 2013, 06:57 AM
Cars that can drive themselves and other amazing gadgetry come with an often ignored downside and that pertains to the cost of fixing some of this stuff when the car is now in the hands of the second or third owner. Combine that thought with several other articles about the diminishing numbers of qualified technicians, and what the scan tools and software to support these systems cost the independent repair shops and all I see is a real nightmare in the future.
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