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  #1  
Old 07-05-2016, 03:28 PM
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Join Date: Jan 2012
Posts: 7,534
Don't randomly throw parts at this car.

Did you jumper the relay, have pump running and try to start the car? If still no start, the relay isn't the problem since it is out of the circuit.

The ECM runs the pump for a few seconds when the key is first turned on to prime the system. If it does not see a tach pulse or cranking signal it shuts off.

The injectors see battery feed through a relay or ignition switch then the ECM grounds each one to fire it, make sure you have power at the injectors.
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Old 07-06-2016, 10:43 PM
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Join Date: Oct 2013
Location: Delaware
Posts: 7
Quote:
Originally Posted by 97 SL320 View Post
The injectors see battery feed through a relay or ignition switch then the ECM grounds each one to fire it, make sure you have power at the injectors.
Car has 12.5 volts going to the injectors when ignition is on and it drops to 8 volts when cranking is this normal? Gonna see if I can get the proper fitting to check the fuel pressure at the rail.

And mpolli my car does have the OVP relay which is another thing I was thinking could be the culprit but from what I have gathered from the forums the car should still be able to start intermittently. My car will not start at all and its been 4 days and I have tried everyday.

Could all my issues be something as simple as a crank sensor. It just seems odd to me that the car shut off and wont start at all with nothing to indicate there was a problem before it happened.
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