If it is, make sure there is power to it. Ok, I need to go buy myself a guage then. You can find out what your truck uses by looking in the repair manual. I do think you have a fuel pump problem. 5.7 Vortec No Spark From Coil: Causes And Solutions. 7 Vortec, has spark, has fuel pressure, no start. If I can get a wiring diagram, he says to check this signal for integrity back to the ECM (he thinks its the yellow wire... anybody know for sure?? Refilled the gas tank a day before. Replaced, because the mechanic said it was bad. Apparently it had to have been acting up some because he had just had the the dist, replaced, with a full tune-up.
While engine is cranking over, see if the noid light is flashing. Aside from that, the only supplies you'll need are the hand tools for removing the ignition coil from the vehicle. 1998 K1500 Vortec starts but won't run -- help! He had another "ASE CERTIFIED GM " mechanic look at it. How To Check For Spark At The Coil? Pulled #1 plug and checked spark, had nice spark. I would change the crank sensor and try it after I have confirmed that the pump is keeping up. 7l vortec engine 2wd CRANK NO START ISSUE. 99 Yukon 5.7..... No start. Have spark and fuel. But what could it hurt? I am under the weather with a stomach virus now (fun), but when I get better, I will first beat on the tank (what could it hurt), then try running a voltage test to the fuel pump while the engine is cranking to determine whether it is getting juice. Last edit: 27 Aug 2019 21:05 by John Curtis. I got the wiring right it's the base timing I got to set. Was created by simperfi84.
In the meantime Ill see about that fuel pressure gauge... are these supposed to be 40psi? Lots of you ever actually diagnose the original problem? Check Engine Trouble Codes. Let me know if that takes care of the problem. 5.7 vortec no start has fuel and spark notes. If the coil is very old, it may be best to replace it, but usually, when a spark is seen, the coil is good. I've had to walk away from this project. Out it would still provide a backfires which would indicate fuel and spark. One test I do with that no start is disconnect MAF electric connection and try to start it, sometimes bad info is worse than no info. Location: Huffman, TX. The one thing I haven't seen you mention that you've tested is for injector pulse. The easiest way to test the ignition coil is with a digital multimeter. TIP: Try unplugging the injectors; one at a time and crank the engine to see if it will start.
Had the timing chain slipped? Transmission: 700R4. That's correct, ICM is good, coil is good, distributor is good, new plug wires and spark is good through plug wires and plugs. I am open to any advice.
The first place you should start if you have a no spark condition is the ignition coil. This thing is unreal. 5.7 vortec no start has fuel and sparkling. First let me clear something up, one of the first things I did was to try starting fluid, and engine would not start. I'm basically down intermittent fuel pump failure or sensor malfunctions. No codes are stored, because the battery has been disconnected at some point. The problem could be: - Blown injector circuit fuse. If the dist is good, you can check the plugs to see if they have fuel on them to see if you are getting the injectors to fire.
So the next day I got in it and it won't start. Well after, alot more tinkering. Have the same problem? If they are all arcing, that's the issue. It turned out spark was dead under compression. My car has 264000 miles. General Information: Customer's truck was towed in because it would not start. Has fuel, has spark, cranks, won't start. New fuel pump, new dist, new Mpfi injectors, new crank and cam sensors, IC sensor, TPS, etc. Today its back to not starting and misfiring in the same manner it was before.
Time to create page: 0. And if the replacement he had put in it a year ago was an aftermarket one, the signs point even closer to that explanation. Connect the noid light. After working on the above I've discovered the wiring job was not good on the engine swap, so i could potentially have an electrical issue. Ground the plug btw. 5.7 vortec no start has fuel and spark. Turns out I've had a faulty ground strap. Also, the (PCM) driver circuit, provides the ground connection, to energize the injectors. Do you loose spark or fuel? I was pretty sure the opti was the problem.
I don't know if the posative side or the negative side pulses. Quick update... Changed out the cap, rotor and Coil wire, it now fires but runs rough... with a smell of gas. When the system is working properly, the charge from the ignition coil flows to the distributor cap before going to the spark plugs. Gibson Stainless Cat Back Swept Side. If the engine starts when a particular injector has been unplugged; that's the shorted injector that needs to be replaced. I checked for spark, good. Received 3 Likes on 3 Posts. This is not an ignition issue. Checked all the fuses there good. 28 Aug 2019 18:13 #33233 by John Curtis.
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