My neighbor owns a 1992 Mack CH truck equipped with an E7 engine. The engine consistently stalls after running for about half an hour, despite replacing all fuel hoses. Even after installing a new injection pump with an electronic governor, the issue persists. The engine now runs for an hour before stalling for the first time after a cold start. We are perplexed by this ongoing problem and seeking advice on potential causes. Any suggestions would be greatly appreciated.
When the vehicle dies, does the lightning bolt symbol (check engine light) illuminate on the dashboard?
Does a 92 model come with lightning bolt light? My 91 model does not have it. I am considering inspecting the entire fuel system from the tanks forward as it seems like there may be a fuel starvation issue causing the problem.
If your engine is overheating, it may be worth checking the fuel cut off solenoid on the fuel pump for any signs of a short circuit. Excessive heat can cause components to expand and potentially cause a short. This could be a possible explanation for your issue.
The new fuel shutoff solenoid that came with the IP has ensured that the fuel supply is optimal. Despite not seeing any warning lights, the owner tried two different ECMs before I installed the new IP. The previous IP was advanced by 9 degrees, causing the truck to feel underpowered. The newly timed IP has improved the engine performance, although the initial issue still persists.
When my R model started having issues, I found that the solenoid under the dash was the culprit. It's worth checking for power in the right places when your vehicle suddenly stops working.
Answer: Answer: Several factors could contribute to this issue, such as fuel delivery problems, electrical issues, sensor malfunctions, or even problems with the engine itself.
Answer: Answer: Even after these replacements, the stalling issue could persist due to other underlying issues like air intake restrictions, faulty sensors, or fuel system problems that need to be thoroughly diagnosed.
Answer: Answer: The extended runtime before stalling could indicate that the initial issue was partially addressed by the new injection pump and governor; however, there may still be unresolved issues causing the engine to eventually stall. Further diagnostics are needed to pinpoint the exact cause.
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.