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7 Series - E23 / E32 (1977 - 1994)

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  #1  
Old 07-19-2014, 03:25 PM
cessnaman cessnaman is offline
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1994 740il - no tach and fuel flow

1994 740il hi there , just bought the car , i put in new battery things all seem to work and operate properly mileage is good ,,how ever no tach and fuel flow ,,what should i look into for this issue?
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  #2  
Old 07-21-2014, 12:45 PM
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tim330i tim330i is offline
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Welcome to Bimmerfest! I've moved your question to the E23 7 series forum, you'll get more help in here.

Good luck,
Tim
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  #3  
Old 07-30-2014, 09:20 AM
bmw-mania bmw-mania is offline
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Welcome

If you just got it, its time to give it a once over.
clean everything, check fuses & amperage, relays, replace as necessary, and lube electrical contacts.

Does the car run? I am assuming "no" from the lack of fuel delivery.
(try starting the car while someone hits/strikes on the bottom of the gas tank)

No tach? check if there a signal being sent?, cluster, etc..

No fuel delivery? check fuel pump relay, check fuel pump, etc..

Cheers!
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  #4  
Old 08-01-2014, 06:29 PM
cessnaman cessnaman is offline
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cessnaman

hi there , thanks ,,, the car runs great thats just it,,,, no tach response or fuel flow,,,, however there is an electrical issue , the cannon plug on the dr side below the powersteering an suspensionlevel res.below fuse box was re wired and the previous guy may have missed a wire ? doesnt make sense though ,given bmw wiring and everything shifting and running properly ,,,,so i think, the car sat for a year , i put in a new battery with a 30amp 2x15 solar power charge control so when the car sits for extended periods it has full juice, tach and fuel flow was a problem the previous owner couldnt afford to fix i guess,
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  #5  
Old 08-04-2014, 10:40 AM
bmw-mania bmw-mania is offline
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Quote:
Originally Posted by cessnaman View Post
hi there , thanks ,,, the car runs great thats just it,,,, no tach response or fuel flow,,,,

not possible.
How does it run without fuel delivery?

Quote:
Originally Posted by cessnaman View Post
however there is an electrical issue , the cannon plug on the dr side below the powersteering an suspensionlevel res.below fuse box was re wired and the previous guy may have missed a wire ? doesnt make sense though ,given bmw wiring and everything shifting and running properly ,,,,so i think, the car sat for a year , i put in a new battery with a 30amp 2x15 solar power charge control so when the car sits for extended periods it has full juice, tach and fuel flow was a problem the previous owner couldnt afford to fix i guess,
The wiring you are mentioning.. was it to bypass anti-theft?

If the wiring is not easily identifiable, and correctable;
I suggest acquiring a FSM or bently manual for wiring schematics.
Im actually certain there is a massive PDF online with all the wiring diagrams.

HOW is it running, driving, and shifting without fuel delivery?

The car sat for a year.. did you try charging your battery before replacing it?
30AMP?
PV cells are a great option.. but, if you're storing it; have you considered a battery cut-off switch install?

Have you checked the fuel pump, relay, pressure regulator, and filer?

Cheers!
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  #6  
Old 08-04-2014, 02:11 PM
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BMWFatherFigure BMWFatherFigure is offline
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Guess he means the instant mpg / l/100k readout in the tach. I would check the wires to the cluster as well as the buggered PO's plug fix. Then do a FULL SERVICE.
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  #7  
Old 08-05-2014, 10:11 AM
cessnaman cessnaman is offline
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you are the most correct, i am thinking when the previous owner had a wiring issue they have shorted the tach head and fuelburn readout , out so the car respondes properly just the tachs side is dead if thats possible, i know in other hi perf app every thing can work just a dead tach head and usually we assume they always work,and being so reliable we tend to ignore it ,,any and all help much appreciated
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