'88 735i transmission problem - BMW Forum - BimmerWerkz.com
1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 02-21-2009, 12:05 AM
n00b
 
jlfulton51's Avatar
 
Join Date: Aug 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jlfulton51 is on a distinguished road
(Thread Starter)
'88 735i transmission problem

I am looking at a 1988 735i that is immaculate and seems to have had exceptional care (garaged, etc.) but the transmission jumps our of overdrive occasionally. If you shut the car off for 10 sec., it is fine again. Is this the ECU, throttle position sensor, or internal?
jlfulton51 is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 02-21-2009, 12:13 AM
OMFG another one!?
 
witeshark's Avatar
 
Join Date: Aug 2004
Location: Miami FL
Posts: 14,697
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
witeshark is just really nice witeshark is just really nice witeshark is just really nice witeshark is just really nice witeshark is just really nice
After the 10 second shut off, how long is it good for? What kind of driving? Do you have access to the service records, and how many miles on the tranny?

BMW

Sig by zeaq
witeshark is offline  
#3 (permalink) Old 02-21-2009, 12:18 AM
n00b
 
jlfulton51's Avatar
 
Join Date: Aug 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jlfulton51 is on a distinguished road
(Thread Starter)
I haven't been able to drive it myself yet. The owner just says "occasionally". The transmission has 143,000 miles on it.
jlfulton51 is offline  
#4 (permalink) Old 02-21-2009, 08:28 AM
n00b
 
jlfulton51's Avatar
 
Join Date: Aug 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jlfulton51 is on a distinguished road
(Thread Starter)
Here's a little more info on the '88 transmission problem. It only shifts out of overdrive when you first are getting up to speed. After you shut if off for 10 seconds your good. It doesn't do it again. The car has only been driven about 1,000 miles in the last 5 years.
jlfulton51 is offline  
#5 (permalink) Old 02-26-2009, 09:15 AM
n00b
 
jlfulton51's Avatar
 
Join Date: Aug 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jlfulton51 is on a distinguished road
(Thread Starter)
'88 735i transmission problem

Thanks for the previous response.
Now that I have this car, I can be a little more specific. The car has 152K miles on it. From the records, it has been serviced well with not previous transmission problems. There are not leaks under the car. I drove it a 1000 miles home. At first it would correct the problem of shifting back into drive by shutting it off for 10 seconds. Then no more problem until you stop again. Later in the trip it would shift back and forth from overdrive to drive a few times, then settle into drive and stay there. After The last time I stopped for gas, it acted like it stayed in drive when I started out rather than starting in 1st. Ocassionally, going down the interstate it would shift into OD, then back into drive and a few times shifted into passing gear for a second. Eventually, it stayed in drive even when I got into town. I hope this helps. Can you please discern anything from this?
jlfulton51 is offline  
#6 (permalink) Old 02-26-2009, 09:40 AM
OMFG another one!?
 
witeshark's Avatar
 
Join Date: Aug 2004
Location: Miami FL
Posts: 14,697
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
witeshark is just really nice witeshark is just really nice witeshark is just really nice witeshark is just really nice witeshark is just really nice
I think one thing I'd have a look at is the throttle position sensor.

BMW

Sig by zeaq
witeshark is offline  
#7 (permalink) Old 02-26-2009, 11:23 AM
n00b
 
jlfulton51's Avatar
 
Join Date: Aug 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jlfulton51 is on a distinguished road
(Thread Starter)
88 735i transmission

Thanks so much for your help. That verifies other recommendations. I'll do that first, and let you know the outcome.
jlfulton51 is offline  
#8 (permalink) Old 03-02-2009, 01:27 PM
n00b
 
jlfulton51's Avatar
 
Join Date: Aug 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jlfulton51 is on a distinguished road
(Thread Starter)
88 735i transmission

I replaced the TPS and the transmission worked well about 20 miles of interstate and around town the next day. However, the idle was around 1,000 rpms. We took another 30 mile drive the next evening. When we stopped and I got out for about 15 minutes, my wife said that there was some sparking or static sounds under the passenger side of the dash. About the third time we stopped at a light it stayed in drive instead of shifting down. I just check the TPS again for resistance when the throttle is operated and the resistance doesn't change.
jlfulton51 is offline  
#9 (permalink) Old 03-03-2009, 09:30 AM
2nd Gear Member
 
Join Date: Jul 2008
Posts: 374
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
FCPGroton is on a distinguished road
We recently hired a certified technician to answer calls all day in regards to pinpointing problems for your BMW. If you ever need assistance feel free to call 1-877-634-0063 and hit button for tech help. We also have some very affordable parts for the 7 series, check out the catalog:

FCP Groton – Discount Car Parts & Auto Parts- Low Prices | Free Shipping

Best of Luck!
-FCP

FCP Groton
877-634-0063 | info@fcpgroton.com

FCP Euro - European Car Parts Specialists
FCP Import - Import Replacement Car Parts
FCPGroton is offline  
#10 (permalink) Old 03-22-2009, 11:01 PM
n00b
 
jlfulton51's Avatar
 
Join Date: Aug 2008
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
jlfulton51 is on a distinguished road
(Thread Starter)
Here is where I stand with the 88 735i transmission. I have changed the ECU with a used one, and nothing has changed. When I start out in the morning it is always fine. After it is driven awhile it will start shifting from drive into third. Eventually, it will not shift out of 3rd. When it first starts acting up it seems to help by shutting the car off for 10 to 15 seconds. When I start out again, it will be fine for awhile, but as the day goes on, even after leaving it parked for a couple of hours, it gradually gets worse. The transmission warning "ding" becomes constant, and it will not shift out of 3rd. After sitting over night, it will be fine for awhile the next morning. Could this be the valve body? or an internal solenoid? If so, is it possible to fix it without rebuilding the transmission?
jlfulton51 is offline  
#11 (permalink) Old 11-05-2011, 12:55 PM
n00b
 
Join Date: Nov 2011
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
taze is on a distinguished road
What resolved the 735 transmission problem

I am in an identical situation with the same problem you describe in your thread of several years ago. I did not see the resolution to the problem. Can you help?
taze is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 1,6,7,8 - Series and Mini Cooper


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
1990 735i shifting problem jrockstangs 1,6,7,8 - Series and Mini Cooper 6 12-26-2008 04:14 PM
Problem With 735i Brake Light Pro-Hunter 1,6,7,8 - Series and Mini Cooper 6 05-20-2006 10:59 AM
735i Transmission Slipping Bigmarc 1,6,7,8 - Series and Mini Cooper 0 02-20-2005 06:33 PM
735i For Sale W/ New Transmission BMHBMW Classifieds Sell & Buy 0 11-12-2004 11:44 AM
Weird Problem on my 88 735i George5er 1,6,7,8 - Series and Mini Cooper 1 02-21-2004 09:14 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome