Very rough Running
1991 BMW 7 Series 730ise

Avatar
madzzz35
Driver
2 points

Problem added: Jan 12, 2008 (13 years ago)
The car is Really hard to start, when she does start if you press on the accelerator she tries to cut out. if you press really slowly on the accelerator it can be driven. There is a really strong smel of fuel coming from exhausts. The only way i can describe what she does is as if its not getting enough fuel. Ive been told it could be several things, Lambda sensor, air flow meter of fuel filter. As this happened to anyone else or as anyone got any ideas.

Car details
Car: BMW 7 Series
Variant: 730ise
Model Year: 1991
Category: Running Rough, Starting & Power Loss
Replies and Fixes
Avatar
madzzz35
Driver
2 points

Jan 12, 2008 (13 years ago)
Sorry but I aso meant to add that when she as warmed up and been driven very carefully for a while evertyhing seems fine, tur the car off and it doesnt start. Leave for an hour and she starts. Also press the accelerator before warm and she backfires. I apologies for my rambling post. Much appreciate any advice
Avatar
Phil67
Top Fixer
376 points

Jan 12, 2008 (13 years ago)
When I had an old escort i got this when the engine was cold. It turned out to be a cracked engine block. It may be an ignition problem, the smell of fuel would mean at least one of the spark plugs isn't firing.
Avatar
mrfixit
Top Fixer
323 points

Feb 10, 2008 (13 years ago)
I would be temted at this point to draw your attention to the coolant temperature sensor. Also with the problem you have had it would be advisable to replace the spark plugs.
The coolant temp sensor is of the two wire type and will have a 5V supply and cold should have around 3.5V coming back out slowly decreasing to around 1.0V when warm. This should be checked at the plug on the sensor and back to the ecu connector to ensure the ecu is receiving the correct info.

This problem is archived

If you're having a similar problem please click below to re-post this problem, you can then customise it to suit your situation.


Options for fixing the problem

Fix the problem yourself

If you need parts to do the job head over to Euro Car Parts to find the parts you need.

  • Free UK Delivery
  • 365 Day Returns
  • Free Click and Collect
Find a Local Mechanic

Use our AutoInsider Find A Specialist search, find garages and mobile mechanics near you.

Simply enter your postcode, select the required specialist areas and view your results.


AutoInsider AI Robot picture

You might find these links to parts and similar problems helpful in solving this problem.
AIBot

Helpful & Related Links
Recalls
Click to see a list of BMW 7 Series Recalls
Parts mentioned on this page

More Problems
See more BMW 7 Series Problems
Having a problem with your BMW 7 Series?

Tell us about your 7 Series problem