The truck initially starts with starting fluid, but stalls shortly after. I disconnected the fuel line near the rail and verified that the pump is functioning properly. Although I am unsure of the exact pressure needed, there is a consistent flow. I attempted to scan the OBD, however, there was a point where I lost communication with the PCM. Despite scanning the system, I did not receive much information. This message was sent from my iPhone.
It seems like my 1958 Corvette, equipped with twin 4-barrel carburetors, was experiencing issues due to a gummed-up float valve in one of the carburetors. Despite replacing all fuel filters and flushing out the fuel lines, the problem persisted, which was incredibly frustrating. --------------------------------- Victor E Rioli --------------------------------- Original Message Original Message: Date: 05-30-2023 Time: 08:31 Subject: Engine Troubles The truck is having trouble starting as it only runs briefly after using starting fluid. I checked the fuel line by the rail and confirmed that the pump is operating and delivering a good flow of fuel. I ran a diagnostic scan with an OBD scanner, but at one point, lost communication with the PCM. The scan provided limited information. Sent from my iPhone
It sounds like your truck might have an issue with the fuel pressure regulator or possibly the injectors based on what you've described. Insufficient fuel pressure would indeed cause the engine to stall after starting with fluid. If your OBD isn't communicating with the PCM, there might also be an electrical issue or a failure within the PCM itself. For a more definitive diagnosis, I'd recommend getting a fuel pressure tester to make sure the pressure's within the manufacturer's recommended range, and you might also want to consider having a professional check your PCM if the connection issues persist.
Sounds like it might not be the fuel pump, but a possible fuel delivery or ignition issue. When you noticed the loss of communication with the PCM, it could be indicative of an electrical issue, potentially with the ECU. I'd suggest performing a compression test to rule out any engine mechanical issues and then check the condition of your spark plugs and injectors. If your injectors are clogged or your spark plugs aren't functioning properly, that could be the reason why the engine isn't staying ignited, despite the starting fluid. A more comprehensive OBD scan might give you a more accurate picture of what's going on—I'd try a different scanner if you're not getting much information from the one you're currently using.
You've done a good bit of troubleshooting already. It's possible the issue could be with the fuel injectors or fuel pressure regulator if your pump is working alright. Also, losing communication with the PCM can be a sign of either a wiring issue or a failing PCM itself. I'd recommend checking the wirings first. Don't forget to verify that your OBD scanner is compatible with your truck's system as it could also be a reason for its failure to communicate.
It sounds like you're on the right track by checking the fuel pump and flow, but if you're losing communication with the PCM, it might be worth looking into wiring issues or a faulty connector. Sometimes corroded connections can cause erratic behavior, which might explain getting the truck running momentarily and then stalling. Have you tried checking ground connections too? It could be a simple fix that’s causing a bigger headache!
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Answer: Answer: Starting with starting fluid indicates a potential fuel delivery issue, which could be related to the fuel pump or fuel system components.
Answer: Answer: You can disconnect the fuel line near the rail to verify if the pump is functioning properly and check for a consistent flow to ensure proper fuel delivery.
Answer: Answer: Losing communication with the PCM could be due to connection issues, faulty OBD scanner, or potential problems with the PCM itself.
Answer: Answer: To address the lack of information, ensure proper connection between the OBD scanner and the vehicle, and consider checking for any error codes or diagnostic trouble codes (DTCs) that may provide more insight into the issue.
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