The 1987 560 SL is experiencing an unusual situation where it does not start.

norwaj

Greetings, everyone.

Recently, I successfully resolved the fuel-related problems with my 1988 560 SL. I made the decision to assist my buddy with his 87 560SL. The issue seems to be distinct from my own. Despite having all the necessary components such as crank, spark, and gasoline, the engine stubbornly refuses to start. The spark plugs in question are W9DC R6 plugs, which may have a 6K ohm resistor. Given that my 88 has a R0, it is reasonable to assume that there may be a potential issue there. Furthermore, while inspecting the automobile, it seems that a significant number of components have been haphazardly installed on this vehicle. The components that need to be checked or replaced are plugs, cap, rotor, wires, fuel pressure regulator located next to the FD, both fuel pumps, fuel filter, and fuel pressure accumulator.
I attempted to initiate the vehicle's engine, and while using starting fluid spray, it did ignite momentarily but failed to sustain operation. I am somewhat perplexed. I also verified the provision of gasoline. Fuel is sent to the fuel distributor (FD), and while the engine is being cranked, fuel is there even when one of the injectors is unplugged. I reestablished the connection and relaxed all the other injector lines at the fuel distributor, confirming the presence of fuel. Additionally, I removed the plugs and saw that they are moist. According to this information, I am receiving gasoline but there is no ignition, which is perplexing because all the necessary components are there for the engine to function. I conducted a compression test and obtained a reading of 150 pounds per square inch (psi) for each cylinder. I am uncertain about the current situation.
I am submitting this to you experts for aid.

Thank you.

sandra

Attempt to exchange the EZL unit from your vehicle with his.

norwaj

Could you provide some details on the potential involvement of the EZL in this matter? I am seeking to enhance my comprehension of this subject. Thank you.

sandra

The EZL module regulates the ignition timing.

norwaj

Will the engine still start even if I get a strong spark during the cranking process?

sandra

In order for the engine to operate continuously, it is crucial that the ignition spark occurs at the precise moment. If you are unwilling to exchange your EZL, you have the option of using a timing light to do a diagnostic check. It should be noted that there is no option to manually alter the time on the 560. The timing adjustments are automatically controlled by the EZL.

BlueiCE

What about the CPS, sometimes known as the notorious "green wire," which is responsible for connecting to the EZL?

norwaj

I managed to solve this problem rather rapidly. I disconnected the main gasoline supply from the fuel distributor and measured the amount of fuel present. The volume was satisfactory, but, the gasoline had an unusual yellow hue. Upon conducting an olfactory examination, I detected a very feeble aroma. Conducted a burn test, and the substance burnt similarly like an aged candle. Therefore, I had a suspicion that the fuel was of poor quality. I completely emptied the tank, which had a total of 10 gallons, and then refilled it with 10 gallons of new 93 octane fuel. Ignited smoothly and operated well. Performed calibration on the carbon monoxide (CO) and thereafter conducted a trial run. I am now running with great joy, similar to the way a cat would run.

sandra

I'm pleased that you were able to make it work.
It is difficult to identify poor quality gasoline online.

BlueiCE

Fortunately, the gasoline Injector System was not contaminated by the poor quality gasoline.
I want to get Tektron Fuel Injector Cleaner and administer a "Italian Tuneup" to my vehicle.

By the way, I must clarify that I made an error about the identification of the "Green Wire" for the sake of precision. The CPS does not connect to the rear of the Engine, but rather to the EZL and the ECU situated under the passenger floor board.

sandra

That is the whole of it.