Quote:
Originally Posted by 47silver
Since the injectors dont add fuel when the car is starting the designers added a cold start valve and the cold start valve only operates when you energize the starter.
|
I don't believe this is correct, the fuel injectors will supply fuel once air is sucked into the engine. As pointed out by boyt911, the cold start valve is only for temporary enrichment when the engine is cold.
Quote:
Originally Posted by T77911S
sorry, ALWAYS, start with looking for air leaks. if you jump into it with gages, you are likely to end up compensating for an air leak even if the pressures are off. someone will adjust their CP's, reset the mixture and not even think about air leaks. you do want to check pressures before adjusting or replacing anything.
|
I might agree if his car was running lean, from his description of the issues I am not sure it is/was (although point #2 could be a lean issue). If he has gages
and knows his previous settings, then he can diagnose the issue better knowing the fuel pressures have not changed. If he doesn't know his previous settings he should still confirm they are within spec before moving on. It is easy to do, a lot easier than getting a smoke test done.
I admit you are correct in general, ask Paulporsche, he had a long thread on a CIS issue he couldn't solve. I eventually diagnosed (and fixed) his vacuum leaks. But the
vacuum leaks were deduced when the car wouldn't run with proper fuel pressures. Same outcome, just worked from a different direction. I don't advocate changing CIS pressure settings to just get the car to run better, but the three basic pressures are the diagnostic starting point in my mind.