I failed, HELP PLEASE!
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Am I confused? Isn't that what I just said?
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
Nope. You said the fumes go to the breather. They aren't supposed to go that direction. The breather hose is the intake air for the PCV. The valve should have full manifold vacuum pulling on it, to evacuate the fumes. This cannot take place without a supply of clean filtered air, therefore the hose to the breather and extra filter element attached to the end.
The OP says the valve popped out when he capped off the breather hose. I'd say that means either A) the hose/pipe from the PCV valve to the carb or intake manifold is plugged up inside, or almost totally plugged, or B) the engine has major blowby issues. The PCV line can be solved fairly easy. Blowby not so easy.
The OP says the valve popped out when he capped off the breather hose. I'd say that means either A) the hose/pipe from the PCV valve to the carb or intake manifold is plugged up inside, or almost totally plugged, or B) the engine has major blowby issues. The PCV line can be solved fairly easy. Blowby not so easy.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
True, it is illegal to put a catalytic converter on a truck that never came with one from the factory.
The emissions decal will say if it was meant to have one or not. On your truck the emission decal on the radiator support should say. NON-CATALYST.
Which is too bad as a catalytic converter would probably clean that trucks emissions right up too.
Make sure the PCV valve is the proper one for your engine. If the truck isn't california smog equipped and the parts people gave you a PCV valve for a california emissions equipped truck, that could cause problems with the PCV system. Also make sure the evaporative emissions system (If Equipped) is working properly, because the canister purge system uses part of the PCV valve to purge the canister of fumes. If the canister is full of raw gas etc..., that could/would cause high emissions.
A Defective fuel pump seal can cause raw gas to enter the oil chambers of the engine, diluting the oil, which in turn would cause oil/fuel to leak through the rings. However your oil would smell of gasoline....
I don't think you are going to have a easy fix though, it sounds like you have excessive blow by. A Compression and leak down test is the best step forward.
The emissions decal will say if it was meant to have one or not. On your truck the emission decal on the radiator support should say. NON-CATALYST.
Which is too bad as a catalytic converter would probably clean that trucks emissions right up too.
Make sure the PCV valve is the proper one for your engine. If the truck isn't california smog equipped and the parts people gave you a PCV valve for a california emissions equipped truck, that could cause problems with the PCV system. Also make sure the evaporative emissions system (If Equipped) is working properly, because the canister purge system uses part of the PCV valve to purge the canister of fumes. If the canister is full of raw gas etc..., that could/would cause high emissions.
A Defective fuel pump seal can cause raw gas to enter the oil chambers of the engine, diluting the oil, which in turn would cause oil/fuel to leak through the rings. However your oil would smell of gasoline....
I don't think you are going to have a easy fix though, it sounds like you have excessive blow by. A Compression and leak down test is the best step forward.
Elder User
Joined: Apr 2009
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From: San Diego
Nothing truer has ever been said. Best lawyer out there is a pistol to take care of those who would do others wrong.
Modular motor junkie
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From: Texas
That is so true! I tried to rep you but it would not let me.
Post Fiend
Joined: Dec 2007
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From: Lost
I can't take credit for originating that saying, but I firmly believe in it....
I just figgered out how to do the rep thingy a day or 2 back........ Last forum I bothered with the rep stuff on, I edited the profiles, giving anywhere from 5-5000 reps at a time (plus or minus). Having admin privis were fun....
I just figgered out how to do the rep thingy a day or 2 back........ Last forum I bothered with the rep stuff on, I edited the profiles, giving anywhere from 5-5000 reps at a time (plus or minus). Having admin privis were fun....
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Junior User
Joined: Sep 2009
Posts: 96
Likes: 0
From: Laramie Wyoming
What are the chances you can get the rest of the numbers (CO, CO2, O2, and NOx)? High HCs could indicate EITHER a rich OR a lean condition (not enough fuel to efficiantly light off in the cylinder). The rest of the numbers, can help pinpoint whats really happening down in there.
And I dont know about california, but in most states, if you get a waiver from an ASE certified technician, you can legally install a cat converter, provided it is an approved unit. In Cali, I would research it, because a cat is a good thing to have.
Anyways, good luck with your issue, and please let us know the exact numbers, so we may better help pinpoint the cause.
And I dont know about california, but in most states, if you get a waiver from an ASE certified technician, you can legally install a cat converter, provided it is an approved unit. In Cali, I would research it, because a cat is a good thing to have.
Anyways, good luck with your issue, and please let us know the exact numbers, so we may better help pinpoint the cause.
Thread Starter
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Fleet Mechanic
Joined: May 2009
Posts: 1,460
Likes: 6
From: Bay Area, Unfortunately
Hi guys,
Thank you for all the input so far, I am still working on this thing. I am going to do a leak down test in the next few days, I am a little concerned because of the blow by, but I am also relieved that the compression numbers are okey. I can deal with replacing the heads, but I am not sure if I should replace the engine (if needed) on a $300 truck.
I will get the other numbers. If I remember correctly, they showed some high oxygen, and the plugs were tan (maybe I am lean). I will also go through and test again for vacuum leaks. I have a pretty good vacuum at the PCV valve, but I am also going to check the EGR system more in depth. I have sprayed starting fluid nead the vacuum lines at idle, but I am wondering if there is a ported vacuum issue. I will check that soon too.
I guess I will do the leak down test first right after checking out the EGR. I am also going to pick a lot of local heads for solutions too.
Thank you,
Nick
Thank you for all the input so far, I am still working on this thing. I am going to do a leak down test in the next few days, I am a little concerned because of the blow by, but I am also relieved that the compression numbers are okey. I can deal with replacing the heads, but I am not sure if I should replace the engine (if needed) on a $300 truck.
I will get the other numbers. If I remember correctly, they showed some high oxygen, and the plugs were tan (maybe I am lean). I will also go through and test again for vacuum leaks. I have a pretty good vacuum at the PCV valve, but I am also going to check the EGR system more in depth. I have sprayed starting fluid nead the vacuum lines at idle, but I am wondering if there is a ported vacuum issue. I will check that soon too.
I guess I will do the leak down test first right after checking out the EGR. I am also going to pick a lot of local heads for solutions too.
Thank you,
Nick
Thread Starter
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Fleet Mechanic
Joined: May 2009
Posts: 1,460
Likes: 6
From: Bay Area, Unfortunately
So the numbers are as follows:
Time 1
CO2 11.3 @15mph 11.2 @25mph
02 4.8 " 4.9 "
HC 217 PPM (max 181) @ 15mph 213 PPM @ 25mph (max is 116)
CO was 0.39@15 mph and 0.43 @25mph
NO was 1607 and 1425 respectively.
The second test was relatively the same with HC 210 at 15 and 195 at 25. The other numbers were only slightly changed.
Time 1
CO2 11.3 @15mph 11.2 @25mph
02 4.8 " 4.9 "
HC 217 PPM (max 181) @ 15mph 213 PPM @ 25mph (max is 116)
CO was 0.39@15 mph and 0.43 @25mph
NO was 1607 and 1425 respectively.
The second test was relatively the same with HC 210 at 15 and 195 at 25. The other numbers were only slightly changed.
Junior User
Joined: Sep 2009
Posts: 96
Likes: 0
From: Laramie Wyoming
Hmm, the elevated NOx, (generally, pre or no cat should be under 1000 at WOT and under 100 ppm at idle) combined with the high O2 readings and pretty low CO readings are all telling me that you are actualy running extremely lean, but not quite lean enough to cause a miss.
Hope that helps some. Let us know what happpens.
Hope that helps some. Let us know what happpens.
Thread Starter
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Fleet Mechanic
Joined: May 2009
Posts: 1,460
Likes: 6
From: Bay Area, Unfortunately
It sure does, thank you, I found a full manifold vacuum hose todaythat was disconnected, creating a leak. I also have a leaking intake manifold gasket. I found it today with starting fluid. I will replace the gaskets tomorrow.
I will keep you posted, thank you,
Nick
I will keep you posted, thank you,
Nick