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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 04-19-2017, 02:28 PM
iamthejmsnyder iamthejmsnyder is offline
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Need help getting e30 started.

I've got an e30 that's been sitting for 10 years. The car was parked when a brake line blew. I changed the fuel pump and rubber lines and luckily all the old gas must of leaked out of the rotted lines so I've got fresh gas as well. I've got good fuel pressure. I'm getting good voltage to the coil positive terminal but the coil ground is not good. I jumped the coil negative terminal to the valve cover ground strap and was getting good spark. So I've got fuel pressure and spark, next was injectors. The DME was getting good power/ground and when I jumped the fuel injector signal pins to ground, I could hear the injectors clicking. That said, when I tried to read the voltage at one of the injectors while the engine was cranking I got nothing. I understand I would't see a constant voltage, but I saw nothing at all. Just for the heck of it I tried several known working DMEs from other ETA cars I had laying around, all yielded the same results. The engine just cranks with no sputter or anything.

I need some advice on the following:
What would be the cause of the coil negative wire not being grounded?
Why would the injectors not fire when the DME is functional and has power?

I did find a Pin-out for the ETA DME and it says that pin 35 is "Injector ground" however when the key is on, I'm getting full battery voltage at that pin. Is this correct? Here's the website I found the Pin-out: http://www.rtsauto.com/ecu-pinout-an...cal-tests-e30/

Any ides are appreciated! Thanks.
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  #2  
Old 04-19-2017, 09:12 PM
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hornhospital hornhospital is offline
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If you heard the injectors clicking, they're working. Undoubtedly they are full of varnish and gum from the old fuel. You can try to clean them with carb cleaner after you get them out, but it's better to just send them to a pro injector cleaning outfit, like witchhunter.com.
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Old 04-19-2017, 10:21 PM
iamthejmsnyder iamthejmsnyder is offline
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Location: Bethel Park, Pennsylvania
 
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Quote:
Originally Posted by hornhospital View Post
Undoubtedly they are full of varnish and gum from the old fuel. You can try to clean them with carb cleaner
Good call I did't think of that. I'll try the carb cleaner. This car is rusty and hardly worth saving anyways so I don't think I'll be sending parts out anytime soon.
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