I have an MTD Yard Machines 22" push mower with a B&S 500 series (10T502 0500 E1) 5.0hp motor. Does it fire at all and try to start? I can't get my DR125 to run. Have spark, compression and fuel press. SPARK: I tested spark with an inline spark tester and it confirmed that there is spark. I have 46psi at the fuel rail, I have 12v at all injectors and plenty of spark, I'm pulling my hair out over this one, I … No start. The trucks battery terminals were corroded causing tick to not start some times, replaced battery and cleaned terminals, now engine cranks every time but no start. Thread Tools. WIth a lack of information, I will start with the most common problems. I have spent hours on it trying to figure out the fault, but still wont run. The four main elements needed for a running engine are: spark, air, fuel, and compression. The machine is getting spark, and i checked the fuel pump and that seems to be working as it should because there is fuel in the carb bowl, but it will not start. Hi! I fix a lot of weedwackers, but am new to lawnmower repair. Got it out this winter, rebuilt carb, new spark plug, and fresh air filter. This lead me to the ecu, which was damaged from when I opened it to tune it, a capacitor was damaged and I bought a new ecu and will be flashing it tomorrow. Have spark, compression and fuel press. First, make sure the gas in the tank is fresh; older gas can form gummy deposits that interfere with starting. The snowblower engine needs gas, compression and spark to start, so if your snowblower isn't starting, focus on those. And as we have learned throughout this journey, where there is no fuel there is no starting car. It no longer runs, I checked the plugs, they all spark, I have good compression in all cylinders, I have fuel, no codes. If so, then your issue is one of timing. An engine must have compression, spark (at the right time), the right fuel mix provided at the right time in the proper air/fuel ratio, proper lubrication. The motor has spark, compression and fuel, but will not start. Re: Spark, fuel & compression but won't start Right, if you say for a fact that it's sparking and there's fuel in the chamber then it should run. Show Printable Version; 01-13-2012 10:34 PM #1. ilyafil. It's very frustrating. I have - compressed the air out of the jets, cleaned everything on the carb - changed the spark plug (D8ea) - checked the wiring etc. I am working on a 2001 Dodge Caravan Sport 3.3L Flex Fuel that will crank, has spark, has fuel at the rail, has compression on at least the front 3 cylinders (cannot easily reach the back three to test), but will not start or even attempt to fire. Results 1 to 22 of 22 Thread: No start. I am getting a nice blue spark, lots of fuel, and good compression For the engine to work properly and your vehicle to start it requires fuel, a spark, and compression. Let’s walk through the steps we took to get his car running. I would take the plug out, use some kind of clamp to ground the plug body, and turn the motor over for a couple seconds. So I have an 01 polaris sportsman 500ho and a few years ago it randomly quit running. No codes even when testing compression. If it has those things, first verify that you have proper compression. View Profile View Forum Posts View Blog Entries View Articles Veteran Member Four Rings. Gummy deposits clog the carburetor so clean or … How did you check for spark? There are three things that make an engine run: spark, fuel, and compression. If the fuel pump is melted, corroded, or just weak it may have difficulty bringing the fuel to the vehicle’s engine in a timely manner. 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