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1995 BMW 525I, check eng. light NOT illum. but still gave a…

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1995 BMW 525I, check...

1995 BMW 525I, check eng. light NOT illum. but still gave a code of 2311,OBD 1, starts up and runs smooth for a few minutes then runs as if coil or injector not right. Exteme cold lately. Has drygas. I hear BMW electrics aren't far behind Lucas(ha ha) Thanks

Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about?

OBD 1 code put out

Mechanic's Assistant: What is the model of your '95 BMW?

525I

Mechanic's Assistant: Are you fixing your 525i yourself? What have you tried so far?

Not much given the outdoor temps, right now I'm considering eng/body grounds and coil(s)

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Will a fuel injector start up good and then run crappy?

Submitted: 6 months ago.Category: BMW
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Answered in 5 hours by:
1/4/2018
BMW Mechanic: Pete, Mechanic replied 6 months ago
Pete
Pete, Mechanic
Category: BMW
Satisfied Customers: 139
Experience: Ase Master Tech
Verified

I dont thing it is an injector problem. I think one of the coils are bad. I have seen them start up ok and then start to missfire after a few minutes. The driver in the coil is weak and when it heats up a bit it fails. Once it starts to miss you can isolate the bad one by disconnecting the coils one at a time. The coil that is bad will not affect the running of the engine because it is not working anyway. I forgot to ask are you going to fix it yourself or bring it to a shop?

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Customer reply replied 6 months ago
I guess the next time I should follow my own instincts, but thanks, I'm still a bit curious about the 2311 code it kicked without the check eng. light on but as I well know extreme cold does things. I put the engine in with the original coils so I have 6 xtras, I also know how to check them with the meter. I'd really like an explanation of the 2311 code.
BMW Mechanic: Pete, Mechanic replied 6 months ago

Since it is an obd 1 car how are you getting this code? I have some older spec sheets at work and will be able to check them toworrow. I have found a B2311 code on the net it is for a brake light switch. I still have an older scanner at work and it has the BMW adapter for the older cars, so I will check that spec sheet also.

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BMW Mechanic: Pete, Mechanic replied 6 months ago

Are you using the gas pedal method of code retrieval? All the codes I have for the engine are 1211 to 1286 codes.

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Customer reply replied 6 months ago
thanks Pete I did figure it to a coil but instead of disconnecting the coil when running (dangerous) I just touched the exhaust manifold for each cylinder since I didn't have a non contact thermometer. I'm all set.
BMW Mechanic: Pete, Mechanic replied 6 months ago

Glad to hear that you found the problem.

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