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Author Topic: Emmisions  (Read 14273 times)

Offline VileZambonie

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Re: Emmisions
« Reply #15 on: November 27, 2008, 05:11:47 pm »
That's EGR solenoid and you shouldn't have vacuum to the EGR valve only to the solenoid.
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Offline frogman68

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Re: Emmisions
« Reply #16 on: November 27, 2008, 05:45:33 pm »
Quote from: VileZambonie on November 27, 2008, 05:11:47 pm
That's EGR solenoid and you shouldn't have vacuum to the EGR valve only to the solenoid.

Thanks but how does the EGR valve open then ? I brought it up to 2500 Rpm and the EGR valve doesnt move no vacuum on the line that is suppose to go to it

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Offline VileZambonie

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Re: Emmisions
« Reply #17 on: November 27, 2008, 05:54:54 pm »
When the ECM energizes it. In closed loop operation.

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Offline frogman68

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Re: Emmisions
« Reply #18 on: November 27, 2008, 06:34:19 pm »
Quote from: VileZambonie on November 27, 2008, 05:54:54 pm
When the ECM energizes it. In closed loop operation.



When is the ECM suppose to energize the solenoid? Can I just bypass the solenoid and run vacuum to the EGR??
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Offline VileZambonie

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Re: Emmisions
« Reply #19 on: November 28, 2008, 11:06:37 am »
Why would you want to do that? And no you can't. EGR should only come on when the engine is hot and when engine load is low. What are you trying to do?
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Offline frogman68

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Re: Emmisions
« Reply #20 on: November 28, 2008, 01:56:50 pm »
Quote from: VileZambonie on November 28, 2008, 11:06:37 am
Why would you want to do that? And no you can't. EGR should only come on when the engine is hot and when engine load is low. What are you trying to do?

I was "troubleshooting" the emissions. The Egr valve would not open (putting hand on diaphragm) when warm and bringing engine up to 2500. I just replaced the Egr vacuum solenoid (16 bucks) now I get like 15 pounds of vacuum at 2500. I havent checked to see if the diaphragm is going up no one is home but could run the vacuum test.

Thanks Ville, trying to understand these computer trucks is driving me nuts
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Offline frogman68

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Re: Emmisions
« Reply #21 on: December 05, 2008, 09:11:10 am »
Tuesday 12/9 is the "Big Day" the truck is going to Emissions Testing .

This time if it fails I will be registering it Historic.

If (hopefully I am getting ahead of myself) it fails I am thinking of doing one of two things.

one rip off all the emissions and put a carb set up on it

two put  a 84 305/350 in it . with headers

Not sure if I should start a new thread if it comes down to it.

Questions are besides having to drop the tank and remove the fuel pump and running new line to the "older style" fuel pump what other issue might I run into ?

Pass or fail I am still thinking of pulling the engine over Xmas Break. Son wants this to be a stick and thinking it might be easier to pull the engine to do all the work putting the "Z" Bar and stuff in
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Offline VileZambonie

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Re: Emmisions
« Reply #22 on: December 05, 2008, 10:05:11 am »
Don't do it! Keep it TBI and I would also keep it automatic personally.
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Offline frogman68

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Re: Emmisions
« Reply #23 on: December 05, 2008, 12:45:30 pm »
Quote from: VileZambonie on December 05, 2008, 10:05:11 am
Don't do it! Keep it TBI and I would also keep it automatic personally.

But a truck to me is a stick, and not the fancy smancy hydraulic ones :) I like having to but some umph behind getting the clutch pedal to go in :)

If  I register it Historic I know more about the Non TBI / Computer controlled engines so I wont be pulling my hair out .
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Offline VileZambonie

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Re: Emmisions
« Reply #24 on: December 05, 2008, 04:54:35 pm »
well send me up all the TBI stuff then cuz I could use an extra setup  :P

Seriously though, sometimes you need to learn new things. TBI is so much better and you can always get help here.
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Offline frogman68

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Re: Emmisions
« Reply #25 on: December 05, 2008, 05:17:19 pm »
Quote from: VileZambonie on December 05, 2008, 04:54:35 pm
well send me up all the TBI stuff then cuz I could use an extra setup  :P

Seriously though, sometimes you need to learn new things. TBI is so much better and you can always get help here.

Ville

I try and learn this Tbi setup and this site has taught me much but I don't want to be grey haired anytime soon :) . I am hoping it will pass on Tuesday and ripping the Tbi off will be a moot point .

Thanks Again
Brian
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Offline frogman68

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Re: Emmisions
« Reply #26 on: December 09, 2008, 07:01:35 am »
FAILED AGAIN  :(

It got better but still did not pass

Test Results

1st HC 7.0335 CO 9.5826 NO 4.3030
2nd HC 11.4070 CO 18.1414 NO 3.4058
3rd HC 5.4978 CO 156316 NO 1.5439

Allowed HC 2.4 CO 80.00 NO 4.20

Between 2nd and 3rd test complete tune up and timing replaced the Cat, Egr Solenoid and MAP sensor (tests failed for both Egr Solenoid and Map sensor) no more codes
Between 1st and second test Oxygen sensor replaced.

Anything else ? I am going to the shop to look at a non computer controlled 350 to see what its got and build a "nice" motor for this beast
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Offline VileZambonie

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Re: Emmisions
« Reply #27 on: December 09, 2008, 07:59:48 am »
You could have brought it to a shop and had it diagnosed and fixed cheaper than the parts you are throwing at it. Without datastream and all of your gas #'s we really can't give you a difinitive answer on what's causing the problem.

Hi CO indicates rich

Hi HC indicates unburned fuel

Without O2 and CO2 we can't tell what's going on.

High Nox = high combustion temps

Make sure it isn't running lean. Check your engine coolant temp sensor, check your fuel pressure.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
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