Bimmerfest BMW banner

1 - 7 of 7 Posts

·
Registered
Joined
·
20 Posts
Discussion Starter #1
Greetings,

I hope this is the right forum for this:

Problem:
When driving my 1988 325iS, (at any speed) it will occasionally stall, then catch itself and resume as in nothing happenend.

Its like this: I'm driving along, then the power suddenly cuts off, (and I can feel the car lurch a bit when the power is cut off) but then (and I'm only assuming this part) the car, which is still rolling, will jump-start itself and then I have power again. All this happens in about one second.

This may happen on the average of 2-3 times every 60 miles or so.
Anyone have any ideas why my car loses power suddenly. Its not like running out of gas, which is more of a gradual loss of power. This is suddenly, and always unexpected, and at any rev.

My thoughts: Faulty Inginition coil? Test or replace it?
Primary ignition circuit shorted or open intermitedly? Its not a timing issue becasue the car runs strong generally, when its not cutting power. Vacuume?

I want to have a little bit of knowledge before I take this car to my mechanic. I hate being at his mercy regarding diagnosis. I don't trust him. BTW, any body know of a trustworthy mechanic in Long Beach, California?

Thanks,

Hairfarmer
 

·
Registered
Joined
·
78 Posts
Pelican Technical Article:
BMW On Board Diagnostics
Jared Fenton


Did you know that your BMW 3 Series has an internal diagnostic program built into the computer? Not many people know about this. On the BMW 3 Series, there is a way that you can diagnose common engine problems without having to purchase a code tool or take it to the dealer to have it scanned. This is one of those neat little features of the Service Indicator Computer; the series of lights directly under the tachometer and speedometer that remind you to change the oil and perform service. In this tech article, I will provide you with the procedure for checking the fault codes and what the codes mean. This guide will help you to diagnose any possible problems with your car.

This article is written for both the BMW E30 and E36 3 Series cars (up to 95) and should work on both models where a Service Indicator Computer is used. I will go over the small differences between the early and late cars, as they differ slightly. Keep in mind that this procedure will not work on early cars with Motronic 1.1.

Now on the E30 models, get in the car and put the key in the ignition and turn it to the second turn or ***8220;ON***8221; position, but do not start the car. Now, press the accelerator pedal all the way to the floor, then let it release all the way back. Now repeat the depress/release cycle 4 more times fairly quickly, but not too fast. It may take some time to get this timing down correct. It should only take you a few seconds to do this. What this does is activate the wide-open throttle switch and the idle switch 5 times. This then sends a signal to the Motronic ECU to send fault codes to the Service Indicator Light.

On the E36 models, the procedure works the same way, but the timing at which you press/release the gas pedal is faster than on the E30. Just keep at it, and you will eventually get the correct speed.

Watch the ***8220;Check Engine***8221; light. It should blink once, and then start blinking a series of four numbers. For instance, say this is a sequence you see***8230; the light blinks once, then twice, then four times and lastly four times. If you read it correctly this means that the SI light is reading out the code 1244 (faulty camshaft sensor) The codes appear as a series of flashes for each digit. The flashes indicating one digit are about one second apart, the next digit will appear after a couple seconds interval. If there are no faults in the car, the computer will flash out the number 1444.

Here is the list of codes and what they indicate.

1211 DME Control Unit
1215 Air Mass Sensor
1216 Throttle Potentiometer
1218 Output Stage, Group 1
1219 Output Stage, Group 2
1221 Oxygen Sensor 1
1212 Oxygen Sensor 2
1222 Lambda Control 1
1213 Lambda Control 2
1223 Coolant Temperature Sensor
1224 Intake Air Temperature Sensor
1225 Knock Sensor 1
1226 Knock Sensor 2
1227 Knock Sensor 3
1228 Knock Sensor 4
1231 Battery Voltage/DME Main Relay
1232 Throttle Idle Switch
1233 Throttle Wide Open Throttle Switch
1234 Speedometer A Signal
1237 A/C Compressor Cut Off
1242 A/C Compressor
1243 Crankshaft Pulse Sensor
1244 Camshaft Sensor
1245 Intervention AEGS
1247 Ignition Secondary Monitor
1251 Fuel Injector 1 (or group 1)
1252 Fuel Injector 2 (or group 2)
1253 Fuel Injector 3
1254 Fuel Injector 4
1255 Fuel Injector 5
1256 Fuel Injector 6
1257 Fuel Injector 7
1258 Fuel Injector 8
1261 Fuel Pump Relay Control
1262 Idle Speed Actuator
1263 Purge Valve
1264 EGO Heater
1265 Fault Lamp (check engine light)
1266 VANOS
1267 Air Pump Relay Control
1271 Ignition Coil 1
1272 Ignition Coil 2
1273 Ignition Coil 3
1274 Ignition Coil 4
1275 Ignition Coil 5
1276 Ignition Coil 6
1277 Ignition Coil 7
1278 Ignition Coil 8
1281 Control Unit Memory Supply
1282 Fault Code Memory
1283 Fuel Injector Output Stage
1286 Knock Control Test Pulse
1444 No Fault Codes
 

·
Registered
Joined
·
20 Posts
Discussion Starter #4
I got an error code using your technique...

I followed your advice about checking error codes. Wow, I never knew this tecnique existed in my 88 325iS.

After trying your advice, the error that I recieved is:

* - ** - *** - ***

"1233 Throttle Wide Open Throttle Switch"

Where do I find this, and how should it be replaced? There is no mention of it in my terrible Chilton manual.

Thanks so much for your help.

DO you think it could still be my DME unit. I found some other info that I thought was helpful:

http://member.rivernet.com.au/btayl...ittStopE28.html

http://member.rivernet.com.au/btayl...antMissE28.html

http://member.rivernet.com.au/btayl...ntermitE30.html

It might also be main relay.

These are the areas that I will start with. Of course, I'll go the cheapest route first, and try swapping the main relay.

Here's some useful information too:

http://member.rivernet.com.au/btaylor/technical.html

BTW, whats the best cway to pinpoint an oil leak. My 88 325iS drinks about a quart every 400-500 miles.



Thanks,

Hairfarmer
 

·
Registered
Joined
·
20 Posts
Discussion Starter #5
Thanks for the input.

Thought I would add more info


It is alot like a neck-snapping jerk when the power cuts off, and yes, my dash/warning lights DO come on for an instant during the power outage. Most of the time the car will resume, but just once I had to pull over to the side of the road and it restarted easily, and I was on my way again. This problem is always unpredictable, but always happens when the car is up to temperature.

One more interesting thing to note. I live in an area with bad roads, and this problem seems to happen more frequently when I'm driving on these bad roads. So maybe my relay or DME is cutting out when I hit a bump or pothole. I know there is an issue with the solder coming loose sometimes around the DME chip and ECU. Maybe the jolting is affecting the Main relay too.

Just not sure. But parts are relatively cheap for my car (88 325iS) on ebay.

It just doesn't seem like a fuel issue, which would be much more gradual and "sputtery".

My course of action will be to replace Main relay first (because its cheaper), then the DME chip, then the entire DME/ECU unit w/chip if all else fails.
 

·
Registered
Joined
·
20 Posts
Discussion Starter #6
Thanks for the input. I wanted to add more info.

It sounds like this is a problem that has affected more than just me. Yes, it is alot like a neck-snapping jerk when the power cuts off, and yes, my dash/warning lights DO come on for an instant during the power outage. Most of the time the car will resume, but just once I had to pull over to the side of the road and it restarted easily, and I was on my way again. This problem is always unpredictable, but always happens when the car is up to temperature.

One more interesting thing to note. I live in an area with bad roads, and this problem seems to happen more frequently when I'm driving on these bad roads. So maybe my relay or DME is cutting out when I hit a bump or pothole. I know there is an issue with the solder coming loose sometimes around the DME chip and ECU. Maybe the jolting is affecting the Main relay too.

Just not sure. But parts are relatively cheap for my car (88 325iS) on ebay.

It just doesn't seem like a fuel issue, which would be much more gradual and "sputtery".

My course of action will be to replace Main relay first (because its cheaper), then the DME chip, then the entire DME/ECU unit w/chip if all else fails.
 

·
Registered
Joined
·
7 Posts
My car has been stalling every once in awhile.Right after starting it will die and then you must let it sit for a long time (usually at least 15 minutes).Then it starts up as normal.This only happens very rarely but it is very annoying to say the least when it does happen!I did the code check and came up with the following:

1251 Fuel injector 1 (or group 1)

My car is a 1990 325I convertible.Anybody have any ideas of what might be wrong?Do i need a new injector?

Jim:thumbup:
 
1 - 7 of 7 Posts
Top