Have spark, compression and fuel press. View Profile View Forum Posts View Blog Entries View Articles Veteran Member Four Rings. How did you check for spark? 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. 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. 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. Let’s walk through the steps we took to get his car running. If it has those things, first verify that you have proper compression. I fix a lot of weedwackers, but am new to lawnmower repair. No start. Does it fire at all and try to start? No codes even when testing compression. 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 … First, make sure the gas in the tank is fresh; older gas can form gummy deposits that interfere with starting. 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. Show Printable Version; 01-13-2012 10:34 PM #1. ilyafil. SPARK: I tested spark with an inline spark tester and it confirmed that there is spark. 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. Have spark, compression and fuel press. WIth a lack of information, I will start with the most common problems. Gummy deposits clog the carburetor so clean or … If so, then your issue is one of timing. 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. I have an MTD Yard Machines 22" push mower with a B&S 500 series (10T502 0500 E1) 5.0hp motor. The four main elements needed for a running engine are: spark, air, fuel, and compression. I have spent hours on it trying to figure out the fault, but still wont run. I have - compressed the air out of the jets, cleaned everything on the carb - changed the spark plug (D8ea) - checked the wiring etc. I can't get my DR125 to run. Hi! The snowblower engine needs gas, compression and spark to start, so if your snowblower isn't starting, focus on those. Got it out this winter, rebuilt carb, new spark plug, and fresh air filter. It no longer runs, I checked the plugs, they all spark, I have good compression in all cylinders, I have fuel, no codes. Results 1 to 22 of 22 Thread: No start. For the engine to work properly and your vehicle to start it requires fuel, a spark, and compression. So I have an 01 polaris sportsman 500ho and a few years ago it randomly quit running. It's very frustrating. 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. 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. And as we have learned throughout this journey, where there is no fuel there is no starting car. There are three things that make an engine run: spark, fuel, and compression. Thread Tools. The motor has spark, compression and fuel, but will not start. I am getting a nice blue spark, lots of fuel, and good compression

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