88 735iL - Won't start, fuel delivery problem? - Bimmerfest - BMW Forums

Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series & 8 Series > 7 Series - E23 / E32 (1977 - 1994)

7 Series - E23 / E32 (1977 - 1994)

Thread Tools Display Modes
Old 10-10-2011, 07:26 PM
samifarhat samifarhat is offline
Registered User
Location: Michigan
Join Date: Oct 2011
Posts: 2
Mein Auto: BMW 735il
88 735iL - Won't start, fuel delivery problem?

So randomly my 88' 735il wouldn't start. It would crank and crank (the cranking was strong and sounded normal), but it just wouldn't start. Finally after turning the key to the "on" position and leaving it for awhile and pumping the accelerator a bit, it would turn on. Once this was accomplished, it would run perfectly as if nothing were wrong with it.
I replaced the fuel pump and the fuel filter, and for about a day it was working normally, however later on, the problem came back. I can usually get it to turn on (after multiple attempts and some hair pulling) about 95% of the time, in which it will run perfectly. The pump and filter were replaced about 4 days ago. I've heard of new pumps being filled with air, and that it may just need some time, but I also am suspecting the fuel pump relay. I checked the fuses and they all seem to be in working order. I was about to buy a new fuel pump relay, but then I was told by a mechanic that if the relay were bad, the car would simply NOT start. Period. Is this true?
I'm worried that it could be a vacuum problem, or worse, electrical; not giving any power to the actual relay (but then again, wouldn't the entire ebox not receive power?).
I'm kind of running out of ideas, and it's incredibly inconvenient. I feel like most mechanics either aren't knowledgable enough about BMW's, or are just flat out crooks (I would really like to NOT have to take it the dealer).
Any suggestions on what I should do? I'm assuming it's not a spark plug problem, for it will fire, and the car will run perfectly (although there is a slight loss of power I think).
Anything you can tell me will be GREATLY appreciated!!
Reply With Quote
Old 10-10-2011, 07:47 PM
downhiller's Avatar
downhiller downhiller is offline
livin large
Location: des moines
Join Date: Oct 2007
Posts: 7,560
Mein Auto: 2012 hypermotard 796
the first thing to do is see if theres fuel getting to the rail when its not starting. then check for spark.
I know a lot about cars. I can look at a car's headlights and tell you exactly which way it's coming
Reply With Quote

See More Related BMW Stories

Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series & 8 Series > 7 Series - E23 / E32 (1977 - 1994)
Today's Posts Search
Thread Tools
Display Modes

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 On

Forum Jump

All times are GMT -7. The time now is 02:33 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001- VerticalScope Inc. All rights reserved.