1993 Mazda B2600 whistling noise and running rough

FLAMINSKULZ

MEMBER
1993 MAZDA B2600
2.6L
4 CYL
4WD
MANUAL
300,000 MILES

I have recently replaced a hose on the underside of my intake manifold from a water jet to the carby doing this I had to remove my entire intake manifold I have put it all back together and it is not running as smooth as it should and it has developed a whistling noise I was wondering if I have to bleed the injectors and if so how do I do so I have checked everything and it is all put back together correct and there are no air or water leaks to be found to make this whistling noise

Thursday, February 20th, 2014 AT 2:24 PM

1 Reply

CARADIODOC

MECHANIC
34,330 POSTS

No one knows how to read that huge sentence when there's no punctuation in it. I don't know what a water jet is or what a "carby" is or what it's doing. I did figure out you have a whistle and you want to bleed the injectors.

A whistle is due to a vacuum leak. If you can't locate it by spraying water over the engine while it's still cold, you may have to resort to using a smoke machine. That will allow you to inject a white, non-toxic smoke at 2 psi into a vacuum hose, then you watch for where it sneaks out. If any air is getting into the engine that doesn't go through the mass air flow sensor, there won't be any gas to go with it. There also can't be any leaks in that tube between the mass air flow sensor and the throttle body.

You don't have to bleed injectors on gas engines. The fuel is constantly circulating through the pressure regulator and back to the tank. Any air in the fuel system will go back to the tank within a few seconds of starting the engine.

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Thursday, February 20th, 2014 AT 4:44 PM