Member
Today I took her for an hour ride and while on the highway doing 80, i try to go in to overdrive and the car stalls, not completely but losses power and check engine light starts to flicker until I step off the gas. Car pulls hard otherwise and redlines through every gear. It seams to be only when I get around the 70mph range and up.
Has anyone heard of this...?
I've replaced plugs, caps, rotors, coils recently with correct parts.
Stomp code shows 1234 but speedo works fine.
I don't have a reader so I'll likely take it to a local specialist but hoping for some golden nuggets from the usual experts???
Thanks,
Nick
Sent from my SM-G965U using Tapatalk
shade tree mechanic
Moderator
Member
Yes, ABS light is on frequently but not constantly. I saw this post however the "cause" does not properly describe the symptoms. Typically happens over 60mph and car Boggs down...kinda like Limp mode, check engine light flashes until I ease up on the gas. Coasts fine all the way past 100mph. Seems to happen on hard acceleration when past 70 or 80.Originally Posted by shogun
Sent from my SM-G965U using Tapatalk
meeknet.co.uk
If you have the ASC light come on make sure the rolling diameter of the front axle is the same as the rear - over 3% disparity and you will have problems you describe - that includes different inflation pressures.
Sent from my SM-G935F using Tapatalk
Last edited by Timm; 08-25-2018 at 12:43 PM.
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
Member
Ya, ASC light is on often but the front and rear axle diam are the same.
Oh, the joy.
Sent from my SM-G965U using Tapatalk
BMW CCA Member
Many people have had the same problem from what I've gathered reading lots of older threads.
My car did the same thing when I first put it on the road but, I used some aftermarket spark plug wires. And it turns out the CIS sensors or donuts for spark plug 6 and 12 did not work correctly on the new aftermarket wires.
As soon as I replaced those two new wires and sensors with the old OEM wires and sensors the engine ran fine.
- - - Updated - - -
The manufacturer had no idea why their sensors did not work correctly. I measured the resistance and they were within specs. Maybe the insulation on the new wires was too thick for the weak Bosch coils to produce a strong enough signal.
Mad Scientist
You sure about that? post the front/ back tire sizes
'91 Dinan 860 Stage III (new 6L engine)
'91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
'91 850i 6sp (mint) (sold)
'90 Dinan 750iL TT stage III (Guido - The Beast)
'94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
'96 850Ci, The George Carlin car
''73 3.0 csi, '08 535i, '03 X5 4.6is
...and a few other non BMW cars
Member
Front- 245/40/18
Rear- 275/35/18
Sent from my SM-G965U using Tapatalk
Mad Scientist
yup, that's not it.
You did mention the check light comes on though... what are the stored codes?
also.. .what plugs did you use exactly?
Last edited by cartoonz; 08-26-2018 at 12:02 AM.
'91 Dinan 860 Stage III (new 6L engine)
'91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
'91 850i 6sp (mint) (sold)
'90 Dinan 750iL TT stage III (Guido - The Beast)
'94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
'96 850Ci, The George Carlin car
''73 3.0 csi, '08 535i, '03 X5 4.6is
...and a few other non BMW cars
BMW CCA Member
I am running the same size tires.
Member
Don't have a reader. I'll have to take it in but stomp code is 1234
Sent from my SM-G965U using Tapatalk
Mad Scientist
does your speedometer jump too?
'91 Dinan 860 Stage III (new 6L engine)
'91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
'91 850i 6sp (mint) (sold)
'90 Dinan 750iL TT stage III (Guido - The Beast)
'94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
'96 850Ci, The George Carlin car
''73 3.0 csi, '08 535i, '03 X5 4.6is
...and a few other non BMW cars
Member
Not at all.
Sent from my SM-G965U using Tapatalk
Mad Scientist
speed sensor code, weird stumbling at speed... hmm...
could be the sensor, but more likely a connector or wire somewhere.
I've not had to trace back that circuit before, I'm sure someone else here has.
Last edited by cartoonz; 08-26-2018 at 03:38 PM.
'91 Dinan 860 Stage III (new 6L engine)
'91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
'91 850i 6sp (mint) (sold)
'90 Dinan 750iL TT stage III (Guido - The Beast)
'94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
'96 850Ci, The George Carlin car
''73 3.0 csi, '08 535i, '03 X5 4.6is
...and a few other non BMW cars
Ultimate Machine Driver
Fuel filters check out? Plugs tight??
Last edited by 8eights; 08-26-2018 at 06:22 PM.
Member
Check, check aaand check.
I'll add that my trans is on its it's way out and slipping a bit but no trans fail error. Any chance when going into overdrive at 80mph could cause that? Doesn't happen below 70-80mph.
Sent from my SM-G965U using Tapatalk
Ultimate Machine Driver
How are your fuel filters?
Member
New. Maybe 1,000 miles.Sent from my SM-G965U using Tapatalk
Posting Permissions
Reply With Quote
Bookmarks