I have a MAF tpi set up with an egr problem. The motor tends to idle a little high when it is put in park sometimes. I also get a code 44 when i sit in traffic sometimes. So, i thought i would check the egr valve. I pulled the vacuum hose off the egr valve and connected a vacuum hose to the valve. The car was idling and continued to idle just fine when vacuum was applied to the valve. So, I thought the egr valve was bad. I paid 70 dollars for a new valve and I still have to same problem with the new valve. The motor does not idle rough when vacuum is applied to the valve. Are my egr passages clogged? Any ideas?

 

Anybody, anybody at all???

 

So, when I apply vacuum to my new egr valve, when the car is idling, nothing happens. No stumbling, nothing. Whats wrong here? Is the valve bad, or are my egr passeges clogged. Also, when I apply vacuum with a hand held vacuum tool, the gauge drops immediately. The egr valve holds no vacuum when the motor is running. Whats wrong? Can somebody please help me out??

 

If nothing changes when you apply vacuum to the egr valve, that is a good indication that the passages are plugged.

 

But shouldnt the valve still hold vacuum. Its got to be one of two things. Either the valve is bad and is not holding vacuum, or the passeges are clogged. Will the valve not hold vacuum if the passeges are clogged?

 

no.either new valve dafram is bad or vacuum pump is bad.push valve open w fingers and see if engine reacts this will answer you question if valve passages are blocked.in any case will not cause code 44 or high idle.i think you should be looking for a vacuum leak as your cause for 44 and high idle.

 

Have you ever tried to get your fingers to the diaphragm on the egr valve on a tpi motor. Its impossible.

 

come to think of it not all valves will hold a vacuum.put your finger on diaphram and see if it moves while pumping.usually only takes about 5 inches of vacuum for valve to react on gm products.but again i definitly dont think this is causing your problem.

 

Have you ever tried to put your finders on the diaphram of a tpi. Its impossible

 

yeah it sucks esp w my fat fingers but you gotta be creative rig something up lol

 

Im so lost now. When i applied vacuum to the valve, nothing happened. It should hold vacuum, but it doesnt. Its a brand new valve

 

is you pump generating vacuum?hold finger over port and watch gauge.does it peg and hold while pumping?

 

Yes, the pump works just fine. When i put my finger on it, the gauge shows that it holds vacuum. It does not do the same when hooked up to the egr valve. It drops immediatly after pumping it.

 

Not necessarily. If I remember right, the valve has a bleed hole, so, it will naturally bleed off vacuum.

I think.

 

your symptoms for egr system error would be pinging and nox emmisions failure for valve not opening and rough or no idle for valve sticking open

 

i think your right these valves do bleed off

 

No it does not have a bleed hole. If you take a valve off the manifold and push the diaphram in with your fingers, and then put your finger over the small hole on top the valve. The diaphram will stay in place. It should hold vacuum.

 

weel then i guess you need to pump that pump alot faster or use use manifold vacuum source fromm the engine itself while running and see if that opens it?

 

Let me just post this one more time so everbody understands. The new egr valve holds no vacuum. When a vacuum pump is applied to the valve, the gauge immediatly drops back to 0 after pumping the tool. To me, that sounds like a bad egr valve. But, the damn thing is brand new?

 

is this engine modified? possibly w heads wo egr ports?are valve covers cenrt or perimeter bolt?

 

dont get huffy were trying to help.whether bad or good its not causing your issue.

 

The heads are original 305 heads with center bolt covers.

I guess i will pull the new valve off and see if it actually holds vacuum. If it does, then I will re clean the egr ports again.

 

Throttle up to around 2000RPM and then apply vacuum to the EGR valve.

I suspect you're running a positive back pressure valve. It takes exhaust back pressure for these valves to hold vacuum.

 

Hello gill9228!!

Use a small mechanics inspection mirror to observe the EGR valve diaphram's movement, no fat finger problems, and no big hand problems!!

When I use a hand vaccum pump, I get vaccum that holds on my EGR valve, and I have the same engine set up as you!!

This is the big one here, why are you checking the EGR valve when you have a code 44??? Code 44 would be a lean exhaust condition, and would warrant a look at the oxygen sensor circuit!!

A code 44 could be set from water in the fuel, faulty O2 sensor, O2 sensor wire contacting the exhaust manifold, bad MAF sensor, low fuel pressure, vaccum leaks, exhaust leaks, or AIR system giving air to the exhaust ports when in closed loop!!

I don't see any EGR in this picture!!

I would suggest that you bark up the right tree!!

 

Code 32 is for the EGR system. The EGR valve that you have is a Negative backpressure valve. It will not stay open with vacuum alone. It has a bleed valve on the bottom that works with exhaust back pressure.

 

Hello profootbrake2!!

One of the diagnostic tests for code 32 is to apply vaccum to the EGR valve, and it should hold that vaccum for at least 20 seconds, if it doesn't the valve is to be replaced!!

The negative backpressure comes into play once you apply that vaccum, and then start the car, the EGR valve should move to the closed position due to the negative backpressure!!



Anyways, gill9228 is still barking up the wrong tree, it's not a code 32, it's a code 44, he said so himself!!

Code 44 has nothing to do with the EGR, as I explained above!!

 

hey guys...
I GOT NO VACUM to my egr and it test out fine,, my car runs hot ,time keeps advancing with predestination and valve rattle... i get no CODES AT ALL... now i have no smog on this car...got any ideas....