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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

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 12-10-2010, 04:00 PM
ragtopE30 ragtopE30 is offline
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Location: Weaverville
 
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Mein Auto: 1988 325i Convertible
Yet another Chip question

I have an '88 325ic and I have installed 19# injectors. The engine is strong and runs smooth but it idles rough when cold and very rich when cold. I am wondering if a chip is the answer or simply adjusting the AFM? If it is a chip, is the Mark D chip the only one that is specific to the 19lb injectors or is there a ebay solution (in my price range)?
Oh and how do I add a pic of my car to my sig?

Last edited by ragtopE30; 12-10-2010 at 04:02 PM. Reason: adding content
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  #2  
Old 12-11-2010, 10:50 AM
markseven markseven is offline
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Mein Auto: BMW M Power
Quote:
Originally Posted by ragtopE30 View Post
I have an '88 325ic and I have installed 19# injectors. The engine is strong and runs smooth but it idles rough when cold and very rich when cold. I am wondering if a chip is the answer or simply adjusting the AFM? If it is a chip, is the Mark D chip the only one that is specific to the 19lb injectors or is there a ebay solution (in my price range)?
Oh and how do I add a pic of my car to my sig?
Miller makes sells a matched chip/MAF set, and the chip can be programmed for 19lb injectors. I don't know if that will cure the rough idle, but I'm pretty sure it will cure the richness and improve performance across the board.
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  #3  
Old 12-11-2010, 05:43 PM
ragtopE30 ragtopE30 is offline
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Thanks, I will check them out.
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  #4  
Old 12-12-2010, 08:27 PM
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ForcedFirebird ForcedFirebird is offline
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Location: Coral Springs
 
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Mein Auto: 1986 327is
You can adjust AFM, but don't recommend it. I currently am running 22.4# injectors in my 2.7i, adjusted the fuel trims by using the Moates Ostrich 2.0 emulator. You can get them for $175 right now and the software is free. My eta mileage is better with the late model inj than it was before the i head swap. Once you have a tune settled, anyone with a chip burner can make you a hard copy.

What did you get the injectors from? Mustang? They still have the single pintle design, and with the car not warmed up, the fuel is being sprayed too heavily during open loop - the fuel isn't being atomized on the of the cold valves. Later model inj have more of a mist design than a direct squirt.

I feel that BMW should have put at least 17# injectors on them stock, you are moving in the right direction After looking at the Motronic code, they ran on the edge of lean with the 14.5's with a stock motor!

EDIT: m50 injectors are the mist design and are 17#-ish, they might have been a better choice to help with cold starts and NOT adjusting the AFM or buying a chip.

Last edited by ForcedFirebird; 12-12-2010 at 08:31 PM.
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Old 12-12-2010, 09:02 PM
ragtopE30 ragtopE30 is offline
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these injectors have four hole on the tip instead of the one hole in the original injectors. I have never used an emulator. Are they pretty user friendly? Do I need any thing special to use it?
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Old 12-12-2010, 09:49 PM
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ForcedFirebird ForcedFirebird is offline
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Just a laptop and wide band o2 guage. Software is free.

The four hole are good, two are best for the m20 since it mists right around the valve stem, right on the back of the valve, but that's a great upgrade from stock or 19# Mustang 5.0 inj.

The emulator is pretty neat, even though it's old school OBD1 stuff, you can actually see when there's a malfunction in some things. I was able to diagnose a bad TPS since the maps during the data tracing were never going to the idle TPS map.
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