Q: Washed Engine Now Car Won't Start

asked by on January 25, 2017

Was offered an engine wash as part of a package at the carwash and I obliged. Driving back home (about a mile later) The car started to jerk and it went into limp mode. Flashing Engine light. It crawled to the house. (A quarter mile more) and it hasn't worked since. (3 Months ago) It rolls but doesn't start. Sometimes it starts and then it goes right off. I am in West Africa and these cars aren't common here, so mechanics are a little baffled. They ran codes and it showed misfire in all cylinders. They suggest I change the ECU, which I did and nothing changed. The mechanic says there too much fuel being disbursed into the injector/nozzles. My main question is, what exactly is responsible for the amount of fuel distribution? Maybe water burned something out?! The car was in perfect condition until the engine wash. Please help!

Thank you so much.

My car has 150000 miles.
My car has an automatic transmission.

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Washing an engine is a risky business. If you’re going to have it done, it’s best performed by a technician who will know where NOT to direct the spray. Now that it has been done, you could have a failure in one or in multiple components. First, you might need to get your old ECU back. Most of those ECU’s are coded so that they will only work in the car in which they were originally installed. They can only be unlocked and reprogrammed using the Jaguar proprietary diagnostic equipment. From there I would check t see that all the ignition coils are dry and be sure there is no water in the spark plug wells. Then look at all the electrical harness connectors to see if any of them are full of water or even if they were knocked off by the water jet. As for the car possibly running overrich: the injection time is controlled by the ECU, depending on signals from the Mass Air Flow Meter, the Accelerator Sensor, and the Temperature Sensors. faults in any of those can give you an overrich condition. I can’t recommend running out and buying those parts, they are expensive and may not solve your problem. This car needs to be diagnosed by a qualified technician. contact Your Mechanic to see if there is a technician in your area. If so they can come to your home and diagnose your No Start Condition and let you know what can be done about it.

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