The problem: My daughter's 84 325e has a severe intermittent miss. It becomes noticeable at about 1800-2000rpm. It usually doesn't reveal it's self until the engine has run for 3+ minutes, thus causing one to think that the problem is resolved, only to have their hope of success crushed once they start to rev the engine and it begins stuttering and sputtering. Return it to an idle and it seems to go away or is no longer noticeable. I believe this rules out any vacuum leak.
What I've done: Replaced spark plugs, plug wires, cap and rotor, fuel filter. fresh gas, injector cleaner. The miss isn't on any one cylinder or constant.
Rule outs???
Throttle switch should only affect at idle or full throttle.
DME, fuel pressure regulator, crank position sensor,air flow meter; if it's one of these why doesn't it do it at start up or all the time??
When driving, it cause the car to surge, accelerating only makes it worse (no powering through the thing). The BMW dealer in Canton, Ohio; said that they don't have anyone qualified to work on it and it predates any of their diagnostics???
My daughter no longer smiles and has lost all hope, I'm desperate to return her faith in the little bimmer and myself.
Please, if anyone has an idea of what the problem might be or what to try next it would be greatly appreciated.
