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2003 Mazda 6 cranks but no spark Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting aggitated New User Jul 14, 2014, 5:09 PM Post #1 of 3 (4092 views) 2003 Mazda 6 cranks but no spark Sign In replaced the coil pack due to scan saying it was bad now it has no spark put old coil pack back and still no spark Hammer Time Ultimate Carjunky / Moderator Jul 14, 2014, 10:37 PM Post #2 of 3 (4062 views) Re: 2003 Mazda 6 cranks but no spark Sign In First, understand that the computer doesn't identify defective parts. It merely identifies a specific situation in a circuit. The actual cause has to be determined. All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment. If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money. Every engine requires spark, fuel and compression to run. That's what we have to look for. These are the basics that need to be tested and will give us the info required to isolate a cause. 1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on. 2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on. 3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off. 4) If all of these things check good, then you would need to do a complete compression test. Once you have determined which of these functions has dropped out, you will know which system is having the problem. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Discretesignals Ultimate Carjunky / Moderator Jul 15, 2014, 12:27 AM Post #3 of 3 (4057 views) Re: 2003 Mazda 6 cranks but no spark Sign In Quote replaced the coil pack due to scan saying it was bad now I'd like to know which scanner you have tells you which part is bad on your car. Seeing how it was wrong in its diagnosis, I guess us techs can sleep a little easier. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved. (This post was edited by Discretesignals on Jul 15, 2014, 12:28 AM)   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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