Very rough Running
1991 BMW 7 Series 730ise

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
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
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.
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.

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