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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 12-08-2013, 12:51 PM
silver97Z3 silver97Z3 is offline
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Location: Culver City, CA
 
Join Date: Mar 2010
Posts: 7
Mein Auto: 1997 BMW Z3 2.8
Replaced air control valve now car won't start!

Hi All, My 1997 Z3 2.8 is having a mid-life crisis , my check engine light is on, I have 3 codes, it is also running very rich and barely passed (by 1 point) the CA smog test a few months ago. One of the codes is P1423 so I decided to tackle that first and searched the forum. I found that 4 of the SAP rivets were broken off at the bottom (but looked okay from the top) so I replaced those with bolts and nuts. Based on forum posts I suspected the air control check valve was stuck shut so I replaced it. Before reattaching to the manifold I felt the air coming out of the valve from the SAP for the first 2 minutes at cold start and then shutting off, so it all seems good. I also replaced the brittle vacuum line. Then I reattached the check valve to the manifold with a new gasket and now the car won't start! Help! It's cranking but not starting, so not a battery problem. I looked at all the fuses in the fuse box and they all seem good. I can't figure out what happened, nothing I did should have affected the engine starting. I hooked up my Scanmaster ELM and there are no new codes, just the old 3. It was actually driving strong and smooth with the 3 codes, just rich and smelly. What should I check to get the car running? My other codes are P0420 and P0740 but like I said it was running strong with those codes although I still want to get it all straightened out.

The car has 65k miles, and it wasn't flooded. This happened last evening and I let it sit over night and tried it again this morning and same thing.

Thanks for any ideas!

Last edited by silver97Z3; 12-08-2013 at 01:18 PM.
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  #2  
Old 12-08-2013, 02:55 PM
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drivinfaster drivinfaster is offline
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Location: in the sticks you piney
 
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Mein Auto: rescued bmw's
i'd check to see what is missing. spark or fuel would be the most likely.




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Old 12-08-2013, 05:10 PM
silver97Z3 silver97Z3 is offline
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Location: Culver City, CA
 
Join Date: Mar 2010
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Mein Auto: 1997 BMW Z3 2.8
Okay, good idea, but I'm new to all this, but willing to try stuff. What's the best way to check on spark and fuel without disassembling things? I know there's gas in the tank! And it was running fine yesterday!
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Old 12-09-2013, 11:12 AM
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ryder23 ryder23 is offline
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Location: San Diego
 
Join Date: Oct 2005
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Mein Auto: 1998 328i Manual
From what you say, the starting issue should be related to what you have touched.
Hopefully, you have it firing again by the time your read this.
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Old 12-09-2013, 07:10 PM
silver97Z3 silver97Z3 is offline
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Location: Culver City, CA
 
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Mein Auto: 1997 BMW Z3 2.8
Unfortunately not. I'm going to have to have it towed to my indy I guess. Of course it seemed like it should be something I touched and I even looked around to see if I bumped something in the vicinity but there's nothing. The car ran absolutely fine when I had the SAP completely out of the car to repair the bolts, so it doesn't even need it (if you don't mind the code) and how can replacing the air check valve stop the sparking? Completely different system. I only touched the stuff related to the secondary air system. I don't get it, and am completely frustrated.
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Old 12-15-2013, 02:00 PM
JayMac JayMac is offline
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Location: Virignia
 
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Mein Auto: what ever starts
Check the fuel pump fuse and relay. Keep in mind that you could be solving a totally separate issue the just happened near the same time. Your front o2 sensor and maf would have an affect on your mixture. You are running rich? Then too much fuel or not enough air. Lean is the other way. You can pull a plug and short it against the block to see if you have spark.
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