blink977 Posted June 29, 2018 Report Share Posted June 29, 2018 Hi everyone, I'm currently trying to fire up LS engine with G4 Storm, engine turns, but backfires. Here's engine setup: LQ4 cast iron engine block with Wiseco domed forged pistons, LS3 CNC ported cylinder head. Compression ratio is somewhere 10.5:1, Link G4 Storm engine management, running 8 injectors and 8 ignition outputs, injection mode is set to Sequenital, and Ignition mode is set to Direct spark. injector number 1 is connected to link output 1, injector number 2 connected to 2, etc. Same for ignition. Firing order set to 1-8-7-2-6-5-4-3. Trigger setup is set to Chevy 5-10 Now about problems: 1. engine backfires. I know it is definitely timing or crankshaft sensor issue, but I have rpm fluctuation due cranking, it goes to 670-700 rpm and falls to 0, then again. Is it normal due cranking? 2. I don't have any readings in Trigger scope. 3. I have few errors at Analog Volt and Analog temp, but MAP sensor works, and readings are fine, also all temperature sensors readings are fine I also afraid about fuel quantity, so does anyone can advice safe start-up fuel map? All I need is to fire it up, to car reach the tuner Thanks Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 30, 2018 Report Share Posted June 30, 2018 8 hours ago, blink977 said: I know it is definitely timing or crankshaft sensor issue, but I have rpm fluctuation due cranking, it goes to 670-700 rpm and falls to 0, then again. Is it normal due cranking? 2. I don't have any readings in Trigger scope. I suspect you might just be using the triggerscope wrong. Below is a quick video showing how to do it. Please have another go, the trigger is the most important part to get right. https://1drv.ms/v/s!AiYbYlZQuRHPmieMTkwQDCXEb2LY Quote Link to comment Share on other sites More sharing options...
blink977 Posted June 30, 2018 Author Report Share Posted June 30, 2018 thank you for the answer. I'm suspecting bad crank sensor, I removed all spark plugs today, disabled fuel and ignition and cranked engine for a while. I still don't have any kind of reading in Trigger Scope. Only thing I have is jumping rpm's reading, 800-0-800 and so on. I removed crankshaft sensor and tested it with multimeter, it pulls up to positive voltage when I putting wrench close to it, but when I'm taking wrench away from it, it stays pulled up. Is that symptom of bad sensor? Sensor is wired to Storm's ground out green wire, and +12 ignition voltage from relay. Maybe it needs +8 volts? Quote Link to comment Share on other sites More sharing options...
motomattx Posted June 30, 2018 Report Share Posted June 30, 2018 Some crank triggers are 5 volt input. Quote Link to comment Share on other sites More sharing options...
blink977 Posted June 30, 2018 Author Report Share Posted June 30, 2018 1 minute ago, motomattx said: Some crank triggers are 5 volt input. crankshaft sensor came from Hummer H2 LQ4 engine Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 30, 2018 Report Share Posted June 30, 2018 2 hours ago, blink977 said: I removed crankshaft sensor and tested it with multimeter, it pulls up to positive voltage when I putting wrench close to it, but when I'm taking wrench away from it, it stays pulled up. If your crank sensor is the black “24X” type then that test is invalid, they are a dual track sensor to read two separate/sandwiched trigger wheels. They only output something logical when the two sensing elements are at different levels. 2 hours ago, blink977 said: I still don't have any kind of reading in Trigger Scope. Did you click capture while it was cranking? The fact that it displays erratic rpm suggests there is a signal there at least some of the time. Quote Link to comment Share on other sites More sharing options...
blink977 Posted June 30, 2018 Author Report Share Posted June 30, 2018 8 minutes ago, Adamw said: If your crank sensor is the black “24X” type then that test is invalid, they are a dual track sensor to read two separate/sandwiched trigger wheels. They only output something logical when the two sensing elements are at different levels. Did you click capture while it was cranking? The fact that it displays erratic rpm suggests there is a signal there at least some of the time. Yes I clicked Capture how to tell difference between sensors? And which sensor should I use? What Trigger parameters should be set? Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 2, 2018 Report Share Posted July 2, 2018 On 7/1/2018 at 9:55 AM, blink977 said: how to tell difference between sensors? The 24X sensor is black, the 58X sensor is grey. On 7/1/2018 at 9:55 AM, blink977 said: And which sensor should I use? The sensor must match the wheel that is fitted to the crank. Do you know if your crank wheel and sensor is a "matched pair? 24X wheel looks like below (notice it is 2 wheels sandwiched together) 58X looks like this: Quote Link to comment Share on other sites More sharing options...
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