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post #21 of 21 (permalink) Old 05-05-2010, 08:21 AM
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Date registered: Jan 2006
Vehicle: 73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
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OK then. New fuel pump means you can assume good fuel delivery. New main relay means you can assume power to the ECU and such. New solenoid isn't necessary if the starter engages and the engine cranks. A couple more things - when you turn the key on (but not cranking the starter), you should hear the fuel pump come on for a few seconds (I think this was mentioned in a previous post, yes?). If not, you have a problem with the pump or the electrical circuit to it. Look to the fuel pump relay as a starting point.

If fuel, plus power, plus pump are all good, look to the ECU. There should be power going to it at all times (also part of a previous post, if memory serves). Take a look at some of the articles I've posted to the forum - there are directions on how to test for all this.

If good fuel delivery, and good power to the ECU, but no signal to the injectors, your ECU is the problem.

Have you unplugged and plugged the harness leading to the ECU? And have you looked for the areas where the wiring harness grounds to the chassis? Try cleaning the grounds too - that's bitten me in the ass before.

Last edited by Grubeguy; 05-05-2010 at 08:24 AM.
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