Testing relay boards...., Can you bench test a 914 relay board....??? |
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Testing relay boards...., Can you bench test a 914 relay board....??? |
second wind |
Feb 24 2022, 02:05 AM
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#1
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Senior Member Group: Members Posts: 857 Joined: 30-December 10 From: Los Angeles, California Member No.: 12,543 Region Association: Southern California |
Hello out there....my car has been dying after getting a good warm up but starts the next morning. The tell tale symptom is that the fuel pump does not run when the stall occurs and even after hours of cooling off it still does not start...but it does in the morning....???
So talk on the street is the relay board is too old to work properly.....the description of 914 LTD's improved and rebuilt relay boards matches the symptoms of my car perfectly so as soon as I scrap up the money I will buy one.....meanwhile I have two spare relay boards and one looks really good. Is there a way to bench test the relay board before I swap the boards ?? These cars sure keep you on your toes and a relay board with fresh soldered connections sure sounds appealing so Brad is holding one for me. So back to the swap out....I hate to go to the effort just to install another faulty board. Look forward and appreciate any and all comments and help....thank you very much!!!! gg |
Superhawk996 |
Feb 26 2022, 01:06 PM
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#2
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914 Guru Group: Members Posts: 5,903 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Let's go back one more step, to the basics.
Before we even start assuming that there are electrical problems, with the fuel pump (only) when it's hot and not running, and you can't hear the fuel pump, have you pulled a spark plug and verified that it is sparking when hot? Engine needs three things to run fuel, compression, spark. (Let's assume for the moment that we can ignore hot compression) If you just assume that it won't run when hot due to no fuel pump noise, and haven't verified that it will spark, you're potentially missing an important clue on how we might start troubleshooting this. That is to say, we need to know for sure, when it's hot and not running, can we ignore the ignition circuit and focus only on the fuel pump? If we can ignore ignition side, that makes the troubleshooting work even easier. What's being done here is to half split the system to the fuel side (Part A), and the ignition side (Part B). If by chance both fuel pressure is missing (no pump noise - Part A is bad) and we have no spark (Part B is bad), then we start looking for what is the common denominator between BOTH A & B. This is a very important starting point. Hopefully, this is making sense. Logical, and methodical. |
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