strange throttle problem?
Discussion
Just been to a friends, as his E30 325 is playing up, and this is what happened.
When you start it, the motor turns, it catches ignition, sparks up, then the revs fall to about 600, then they bounce up and drop again and again, even cutting out. I thought it was the idle screw, but that doesnt explain what happens when you drive it and try to rev it.
We crept up to a nearby road (at about 1500 rpm, and it ran, but it wasnt smooth revs, coughing now and again). When I put my foot down, the engine cut out (didnt stall), sounded like bogging in a 2 stroke when its too rich. To get any power/revs out of it, you had to tease the throttle pedal down no faster than the rate the revs can increase, otherwise it does this cutting out thing again.
Returned back to his, and again it sounded unhappy at idle, and difficult to drive at slow speeds due to being jerky and me being unable to apply power..
To me (no expert), it sounds like its not getting enough of something, fuel maybe... Fuel line split? pump? could it be the airbox (which is standard)?
Any tips would be welcome
ps, it is very sudden, as the car was used about an hour before for a quick trip, and all was well..
It does have a habit of trying to idle low when cold, revs do tend to drop a bit, the car shudders then the revs pick up again before it stalls.. but never as bad as this..
When you start it, the motor turns, it catches ignition, sparks up, then the revs fall to about 600, then they bounce up and drop again and again, even cutting out. I thought it was the idle screw, but that doesnt explain what happens when you drive it and try to rev it.
We crept up to a nearby road (at about 1500 rpm, and it ran, but it wasnt smooth revs, coughing now and again). When I put my foot down, the engine cut out (didnt stall), sounded like bogging in a 2 stroke when its too rich. To get any power/revs out of it, you had to tease the throttle pedal down no faster than the rate the revs can increase, otherwise it does this cutting out thing again.
Returned back to his, and again it sounded unhappy at idle, and difficult to drive at slow speeds due to being jerky and me being unable to apply power..
To me (no expert), it sounds like its not getting enough of something, fuel maybe... Fuel line split? pump? could it be the airbox (which is standard)?
Any tips would be welcome
ps, it is very sudden, as the car was used about an hour before for a quick trip, and all was well..
It does have a habit of trying to idle low when cold, revs do tend to drop a bit, the car shudders then the revs pick up again before it stalls.. but never as bad as this..
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