1985 BMW 735 still wont start

85BIMMER735

MEMBER
1985 BMW 735
6 CYL
2WD
AUTOMATIC
320,000 MILES

I have tried everything that you guys have helped me with I have replaced the plugs, wires, cap, rotor, igntion coil, battery, fuel preasure regulator, I am getting fuel and im getting spark and the timeing is set right but my car just wont start it cranks and cranks but never ignites it floods itself before anything I have only got it started once after it broke down and I did that by jumping the cold start valve right to the battery but now that doesnt even work sorry for asking about my car so much but im thinking about taking it to the junkyard this is my third post about this

2 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

Then I takeit you have been working with Doc Hag. I will forward this to him, thx for your patience

Was this

answer

helpful?

Yes

No

Thursday, February 18th, 2010 AT 10:28 PM

DOCHAGERTY

MECHANIC
9,601 POSTS

Three things needed for an internal combustion engine, fuel, spark and compression. Is the fuel contaminated? Are the injectors being driven correctly, or are they "on" all the time? A wiring issue can be to blame. The injectors are powered all the time and pulsed by the DME, if the wiring harness is shorted internally, the fuel wont stop flowing through the injector. If the CTS is faulty it will tell the DME to run full rich. If there is spark, is it getting to the cylinders? What is the mechanical condition of the engine? Does it need a valve adjustment or perhaps a bit of valve work? Unfortunately, I cannot see what you are seeing at the car and my involvement is somewhat after the fact. I resist giving advice regarding replacement of parts due to the fact that that may not solve the problem and that methodical testing, if followed, will inevitably uncover the root cause, then replacement of parts can easily be justified. I recommend that a check list be generated to state what is so, start with the basics as referenced above and in the past threads, and let me know what you come up with.