It appears I have a broken vac line for this piece. What is it?

 

that looks like the EGR diaphram, i would think the car would through a code if that was getitng no vacume.

 

No code. Noticed it about 2 weeks ago had to drive it for one of them. Would this cause me to run rich?

 

are you sure you just didnt break it when your working on it??? Those lines become so brittle after time that they can break from you looking at them.

 

that is so true... and i really like the way you put that. LOL

 

yeah I'm sure. I noticed that the line was broken before I pulled the TBI unit. I couldn't get as good of a look but I noticed it. I gathered some date with Winaldl and it said that my car was rich. Really rich. Could this be the cause?

While I have the unit off I plan to make the fuel pressure regulator adjustable. That and the Ultimate TBI stuff.

Thanks for the info guys.

 

You better stick some rag's in those holes on your intake before you get some of the dust of dirt in there

 

since you obviouse have broken vacume lines . . . maybe the real problem is a vacume leak

 

Yeah I got that covered. Took the TBI off then took some pics. Can a vac leak there cause a rich reading is my main question.

 

The circled part is both the diaphragm (the saucer segment) and the pintle valve, both part of the so-called EGR valve assembly.

The hard line (hard rubber, or plastic) that connects the intake manifold -to- the EGR diaphragm has a solenoid-controlled valve in between. The ECM "tells" the solenoid when to allow vacuum to be applied to the EGR, hence opening the EGR pintle (valve) and allowing exh gas to go into the intake manifold.

If the hard line were cracked between the solenoid and the EGR, then (1) the EGR wouldn't function and (2) you would have a vacuum leak at cruise (the only time when EGR is supposed to be applied).

OTOH, if the hard line were broken between the intake manifold and the solenoid, then (1) the EGR wouldn't never function and (2) you would have a vacuum leak all the time.

Now to your question: would this cause the engine to run rich? Perhaps, and for two reasons.

First, the vacuum leak is an air leak, so it means you have air entering the intake manifold but where the air is not subject to good mixing under the injectors. So that means you wouldn't have as-good a fuel-air mixture, and that could lead to irregular running, and rich in some cylinders. This is probably a smaller effect than the next one.

Second, and assuming your have a speed-density engine (TBI), then the fuel delivered by the injectors is mostly detemined by the MAP sensor (which will feel less vacuum, or more air pressure) together with the throttle position sensor (TPS). The MAP will feel more atmosphere, and hence "think" there's more load on the engine that there really is -- so it will supply more fuel. I don't know how the TPS will affect this, other than to say that you'll be getting more air into the engine than the throttle and IAC are meant to supply.

So for both of these reasons, probably more for the second reason than the first, you probably will have an engine that runs rich. HTH.

 

Thankyou. That answered my second question. Now for one more. Can I replace that broken (not cracked ) line with standard vacuum line?

Thanks for the info guys. :hail:

 

i don't see why not.