i have a 95 honda accord with a v tec engine and i have a problem. the car has a loud rumble at low speeds and runs like crap when the c/a is on and often stalls when i come to a stop with it on. alwo the brake depressurises itself after i come to a stop, often leaving my car moving again. then when i do press the brake pedal to the ground it will either give me a louder rumble or smothe out for a few seconds depending on if the car is running more smothly or choppy that day, respectivly to the problems. i was wondering if this could be a vaccum leak somewhere causing all of this. if some one could help me out with some ideas i would realy apreciate it.

 

Not too sure about your rumble but your brake problem sounds like the brake master cylinder. I take it you're not losing any brake fluid or anything like that? Yeah brake master cylinder, mine did the same thing.

 

I'd agree that it sounds like a master cylinder problem for your brake issue (providing your brake fluid is full), as for the stalling issue does your car idle up when you turn on the a/c? Does it run fine with the a/c off?

 

yea it idles up, but it runs batter with it off, but it still runs badly and is very choppy

 

I would do a search on here for 'cleaning TBI'. I have not had to do it myself but from what others have said it sometimes can cure a crappy idle. Check it out and let us know if it helps. Also, what does your car idle at?

 

If you are at idle in neutral and step on the brakes, the idle dips way low or stalls; you need to start looking for a vacum leak.
The reason is the brake booster uses a large volume of vacum and then if there is a vacum leak the engine suffers.
Might be a problem at the A/C idle boost, does the RPM increase when you turn on the A/C ??

 

good idea on the neutral test... I was of the same opinion as you though... sounds like a low idle issue and a bad master cylinder.... but diagnose before you start replacing crap...

 

how do i look for a vaccum leak? and also could it be the IACV?