EGR help please

[roger longman]

Hi all, having solved my running problems by plugging the EGR line, I see that it is supposed to cause other symptoms.Can anyone tell me what those are, I can find none ? Also how do I get to the EGR, in order to check it out ? Seems like quite a job. Thanks. Roger.

 

[vetteoz]

The plenum has to come off the access the EGR valve.
If the valve is faulty ( not sealing say ) you can bypass it without removal by plugging the EGR supply port on the intake. Might get a code 32 but nothing else

 

[Schrade]

Hi all, having solved my running problems by plugging the EGR line, I see that it is supposed to cause other symptoms.Can anyone tell me what those are, I can find none ? Also how do I get to the EGR, in order to check it out ? Seems like quite a job. Thanks. Roger.

What other problems does it cause?

To test it on a PROPERLY TUNED car, reach under the plenum, and press the diaphragm between the brackets. It resembles a speaker frame, with the voice coil element resembling the diaphragm.

Doing this creates a vacuum leak, and the car will stumble.

Are you getting a loping idle already when the car is warm?

 

[roger longman]

Hi Oz, I've already plugged the vacuum line but without it attached I don't think it will pass the smog test in S.California. I could just reattach it for the test I suppose. Does having it attached/nonattached make any difference at all to how it runs ? Thanks. Roger.

 

[roger longman]

Hi Schrade, It's now disconnected and she runs much better. I will do as you suggest when I get the chance. No, doesn't and didn't lope in idle. Idle does seem a little rough but not enough to show on the tach. I see from the other thread that you say it will allow vapour to build up, how dangerous is that. How's the weather where you are ? Oh forget that, "off topic". Thanks Roger.

 

[John Robinson]

New idea

You might try checking all the vacuum hose connections. Over time they will become loose were they connect to the fittings or develope small cracks that will cause leaks. The simpliest thing I have found to do to track down bad vacuum is to buy several pieces of(I get about 3 foot pieces) vacuum hoses that are the size of the connectors. With the engine running take the new hose and do a bypass of the old hose and see if the engine changes how it idles. If it changes you have found a vacuum leak in that line replace it and go onto the next vacuum line. Of course you can use a vacuum gauge if you have one but if not then it is cheaper to buy some hose than it is to buy a gauge.

 

[tdr1919]

you can do what I just did to find my vac. leak. at idle spray throttle body cleaner around the plenum area. move all around from the left side, front and right side, if there is a leak, you will notice your rpms go up.
you can use, other things like propane (not lit!) starter fluid.

By plugging your vacuum line isnt testing the egr, like schrade said you can get your fingers in and push up on the diaphram, but you should also connect a hand vacuum pump, and draw a vacuum, you should watch the diapram move up on the egr, if you cant draw a vacuum or it bleeds right away, the egr is no good. not a hard job to remove the plenum. You will fail for hydrocarbons without the egr.
Tom

 

[roger longman]

Thank you Gentlemen, I'm still worried about this vapour build up. Roger.