94 BMW M50 loping problem
#1
YANKYMATE!
Thread Starter
94 BMW M50 loping problem
Here's the issue:
Car is a 92 BMW 5 series with a 94 M50 motor swap.
Aftermarket cams (unknown), Bavarian Auto Works Chip
The car starts and runs fine, but as it warms up it begins to lope. We've run through tons of possibilities and eliminated vacuum leaks, fuel problems, and electrical issues.
We've pretty much done all that we can do, what we need now is to hook it up to a computer to find the issue.
I've researched local businesses, but they can charge upwards of $200 just to hook it up.
Anyone know anybody with the ability to tune this car or to let me use their diagnostic system?
Any questions, just ask
Thanks
Car is a 92 BMW 5 series with a 94 M50 motor swap.
Aftermarket cams (unknown), Bavarian Auto Works Chip
The car starts and runs fine, but as it warms up it begins to lope. We've run through tons of possibilities and eliminated vacuum leaks, fuel problems, and electrical issues.
We've pretty much done all that we can do, what we need now is to hook it up to a computer to find the issue.
I've researched local businesses, but they can charge upwards of $200 just to hook it up.
Anyone know anybody with the ability to tune this car or to let me use their diagnostic system?
Any questions, just ask
Thanks
#2
Vatican Assassin
Join Date: Oct 2009
Location: Glen Allen
Posts: 302
Likes: 0
Received 0 Likes
on
0 Posts
Re: 94 BMW M50 loping problem
do you have VANOS? if so the seals? check bimmerforums or e46fanatics, i'm sure somebody is nearby and can pull codes if it's throwing any...
Last edited by MissmyE30; 11-02-2009 at 08:15 AM.
#4
Vatican Assassin
Join Date: Oct 2009
Location: Glen Allen
Posts: 302
Likes: 0
Received 0 Likes
on
0 Posts
Re: 94 BMW M50 loping problem
i think so. i'm new to all the bmw computer controlled crap. my last engine was an M20 which was an absolute delight to work on. i think vanos seals might cause some idling/driveability issues but i'm not totally sure. you could search on bf.c or e46fanatics and there's probably a DIY on vanos seal replacement. they might shed some light on the symptoms they were having..good luck!
#5
YANKYMATE!
Thread Starter
Re: 94 BMW M50 loping problem
yeah i'll get on bimmerforums or something and take a look around.
i found this site: http://www.beisansystems.com/procedu..._procedure.htm
thanks for all your help man
i found this site: http://www.beisansystems.com/procedu..._procedure.htm
thanks for all your help man
#7
YANKYMATE!
Thread Starter
Re: 94 BMW M50 loping problem
the car runs fine without any codes, but when the loping starts, the 'check engine' light comes on
i have an obd2 code reader, but not an obd1, thats why i was asking if someone had a computer to hook up, so i don't know the exact code
i'm taking a look at the vanos seals tonight though, more updates as they come.
i have an obd2 code reader, but not an obd1, thats why i was asking if someone had a computer to hook up, so i don't know the exact code
i'm taking a look at the vanos seals tonight though, more updates as they come.
#8
Re: 94 BMW M50 loping problem
the regular m50 didnt have vanos. the m50tu had a single vanos. sometimes i have seen failing vanos units do what u describe and wont set a light. as the oil heats up it will leak by the vanos seals. I will look in a few to see if my scanner will go back that far.
#9
Racetracks
Join Date: Nov 2002
Location: How long is a piece of string?
Posts: 15,668
Likes: 0
Received 0 Likes
on
0 Posts
Re: 94 BMW M50 loping problem
Is there a service check connector that can be jumped to flash the codes out on the check engine light? Many/most OBD1 cars have that feature, I'm not that familiar with BMW troubleshooting though.
#10
Vatican Assassin
Join Date: Oct 2009
Location: Glen Allen
Posts: 302
Likes: 0
Received 0 Likes
on
0 Posts
Re: 94 BMW M50 loping problem
Hmmm. You say it only shows up when the engine is warm. Shot in the dark here but what about your O2 sensors? I ask bc the ecu ignores the O2 sensor signal until the engine is warm so if they're bad they'd be sending a bad signal to the ecu for the fuel mixture and it would only happen when the engine has warmed up. Worth a quick check if you're handy w a multimeter. Unfortunately I have no idea what the proper values would be for your engine. You would need to look online or have a bentley manual handy. Hth.