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Re: No Ported Vacuum
On some vehicles, ported vacuum only works above a certain rpm, some
distributors use ported vacuum, which only opens at certain point, like an EGR valve. Don't know about yours, but you might try raising the engine speed and see. Spdloader "steve" <None@nothing.com> wrote in message news:TZzcf.15003$q%.4699@newssvr12.news.prodigy.co m... > Hi All, > > So I changed every inch of vacuum hose in the Jeep this weekend and > connected everything to factory specs and guess what - still no ported > vacuum. I did find the other port referred to in this discussion and > checked it too - also no vacuum. I tried blowing into the port and it is > not blocked and I can hear the air entering the carb somewhere down below > the chock plate. Anybody have any ideas. I have not gone for the smog > test yet since the EGR obviously has no vacuum and don't want to risk > failing another test. > > - Steve > "steve" <None@nothing.com> wrote in message > news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... >> Hi All, >> >> I am not getting any ported vacuum going to my EGR valve. I checked the >> vac at the connection that is on the top of the Carter BBD - the one on >> the engine side of the carb and there is no vacuum at any RPM. Anyone >> have any ideas why? >> >> Thanks in advance, >> Steve >> >> > > |
Re: No Ported Vacuum
On some vehicles, ported vacuum only works above a certain rpm, some
distributors use ported vacuum, which only opens at certain point, like an EGR valve. Don't know about yours, but you might try raising the engine speed and see. Spdloader "steve" <None@nothing.com> wrote in message news:TZzcf.15003$q%.4699@newssvr12.news.prodigy.co m... > Hi All, > > So I changed every inch of vacuum hose in the Jeep this weekend and > connected everything to factory specs and guess what - still no ported > vacuum. I did find the other port referred to in this discussion and > checked it too - also no vacuum. I tried blowing into the port and it is > not blocked and I can hear the air entering the carb somewhere down below > the chock plate. Anybody have any ideas. I have not gone for the smog > test yet since the EGR obviously has no vacuum and don't want to risk > failing another test. > > - Steve > "steve" <None@nothing.com> wrote in message > news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... >> Hi All, >> >> I am not getting any ported vacuum going to my EGR valve. I checked the >> vac at the connection that is on the top of the Carter BBD - the one on >> the engine side of the carb and there is no vacuum at any RPM. Anyone >> have any ideas why? >> >> Thanks in advance, >> Steve >> >> > > |
Re: No Ported Vacuum
Here are some more answers/clues: The idle is very good and smooth even
down to 600rmp. I do have manifold vacuum. I did have oil puking into the air cleaner but I took care of that a long time ago by venting the crankcase out the back of the Jeep via a long hose...and yes, a lot of blow by does come out. I also went for the smog test today and failed. The hydrocarbons were good, CO was 0 at both 15 and 25 mph but the NO was 1100 at 15mph (max is 750) and was 690 at 25mph. I also failed because the timing was 0 btdc. The guy told me that the timing might be causing the high NO but I am woried that it is the EGR not getting any ported vac. I know the egr is not strong at 15 but I am sure a bit of egr would help. It seems to work at higher speed. Any thoughts? Also, anybody have the link to that trick to adjust timing without a timing light? Thanks again for all the help...glad you guts are sticking with me here! "steve" <None@nothing.com> wrote in message news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... > Hi All, > > I am not getting any ported vacuum going to my EGR valve. I checked the > vac at the connection that is on the top of the Carter BBD - the one on > the engine side of the carb and there is no vacuum at any RPM. Anyone > have any ideas why? > > Thanks in advance, > Steve > > |
Re: No Ported Vacuum
Here are some more answers/clues: The idle is very good and smooth even
down to 600rmp. I do have manifold vacuum. I did have oil puking into the air cleaner but I took care of that a long time ago by venting the crankcase out the back of the Jeep via a long hose...and yes, a lot of blow by does come out. I also went for the smog test today and failed. The hydrocarbons were good, CO was 0 at both 15 and 25 mph but the NO was 1100 at 15mph (max is 750) and was 690 at 25mph. I also failed because the timing was 0 btdc. The guy told me that the timing might be causing the high NO but I am woried that it is the EGR not getting any ported vac. I know the egr is not strong at 15 but I am sure a bit of egr would help. It seems to work at higher speed. Any thoughts? Also, anybody have the link to that trick to adjust timing without a timing light? Thanks again for all the help...glad you guts are sticking with me here! "steve" <None@nothing.com> wrote in message news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... > Hi All, > > I am not getting any ported vacuum going to my EGR valve. I checked the > vac at the connection that is on the top of the Carter BBD - the one on > the engine side of the carb and there is no vacuum at any RPM. Anyone > have any ideas why? > > Thanks in advance, > Steve > > |
Re: No Ported Vacuum
Here are some more answers/clues: The idle is very good and smooth even
down to 600rmp. I do have manifold vacuum. I did have oil puking into the air cleaner but I took care of that a long time ago by venting the crankcase out the back of the Jeep via a long hose...and yes, a lot of blow by does come out. I also went for the smog test today and failed. The hydrocarbons were good, CO was 0 at both 15 and 25 mph but the NO was 1100 at 15mph (max is 750) and was 690 at 25mph. I also failed because the timing was 0 btdc. The guy told me that the timing might be causing the high NO but I am woried that it is the EGR not getting any ported vac. I know the egr is not strong at 15 but I am sure a bit of egr would help. It seems to work at higher speed. Any thoughts? Also, anybody have the link to that trick to adjust timing without a timing light? Thanks again for all the help...glad you guts are sticking with me here! "steve" <None@nothing.com> wrote in message news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... > Hi All, > > I am not getting any ported vacuum going to my EGR valve. I checked the > vac at the connection that is on the top of the Carter BBD - the one on > the engine side of the carb and there is no vacuum at any RPM. Anyone > have any ideas why? > > Thanks in advance, > Steve > > |
Re: No Ported Vacuum
What grade of gasoline are you using for the test? The lower the octane the
faster it will burn, might be enough to get you a passing grade. "steve" <None@nothing.com> wrote in message news:b9xdf.26151$6e1.3342@newssvr14.news.prodigy.c om... > Here are some more answers/clues: The idle is very good and smooth even > down to 600rmp. I do have manifold vacuum. I did have oil puking into > the air cleaner but I took care of that a long time ago by venting the > crankcase out the back of the Jeep via a long hose...and yes, a lot of > blow by does come out. I also went for the smog test today and failed. > The hydrocarbons were good, CO was 0 at both 15 and 25 mph but the NO was > 1100 at 15mph (max is 750) and was 690 at 25mph. I also failed because > the timing was 0 btdc. The guy told me that the timing might be causing > the high NO but I am woried that it is the EGR not getting any ported vac. > I know the egr is not strong at 15 but I am sure a bit of egr would help. > It seems to work at higher speed. Any thoughts? Also, anybody have the > link to that trick to adjust timing without a timing light? > > Thanks again for all the help...glad you guts are sticking with me here! > > "steve" <None@nothing.com> wrote in message > news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... >> Hi All, >> >> I am not getting any ported vacuum going to my EGR valve. I checked the >> vac at the connection that is on the top of the Carter BBD - the one on >> the engine side of the carb and there is no vacuum at any RPM. Anyone >> have any ideas why? >> >> Thanks in advance, >> Steve >> >> > > |
Re: No Ported Vacuum
What grade of gasoline are you using for the test? The lower the octane the
faster it will burn, might be enough to get you a passing grade. "steve" <None@nothing.com> wrote in message news:b9xdf.26151$6e1.3342@newssvr14.news.prodigy.c om... > Here are some more answers/clues: The idle is very good and smooth even > down to 600rmp. I do have manifold vacuum. I did have oil puking into > the air cleaner but I took care of that a long time ago by venting the > crankcase out the back of the Jeep via a long hose...and yes, a lot of > blow by does come out. I also went for the smog test today and failed. > The hydrocarbons were good, CO was 0 at both 15 and 25 mph but the NO was > 1100 at 15mph (max is 750) and was 690 at 25mph. I also failed because > the timing was 0 btdc. The guy told me that the timing might be causing > the high NO but I am woried that it is the EGR not getting any ported vac. > I know the egr is not strong at 15 but I am sure a bit of egr would help. > It seems to work at higher speed. Any thoughts? Also, anybody have the > link to that trick to adjust timing without a timing light? > > Thanks again for all the help...glad you guts are sticking with me here! > > "steve" <None@nothing.com> wrote in message > news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... >> Hi All, >> >> I am not getting any ported vacuum going to my EGR valve. I checked the >> vac at the connection that is on the top of the Carter BBD - the one on >> the engine side of the carb and there is no vacuum at any RPM. Anyone >> have any ideas why? >> >> Thanks in advance, >> Steve >> >> > > |
Re: No Ported Vacuum
What grade of gasoline are you using for the test? The lower the octane the
faster it will burn, might be enough to get you a passing grade. "steve" <None@nothing.com> wrote in message news:b9xdf.26151$6e1.3342@newssvr14.news.prodigy.c om... > Here are some more answers/clues: The idle is very good and smooth even > down to 600rmp. I do have manifold vacuum. I did have oil puking into > the air cleaner but I took care of that a long time ago by venting the > crankcase out the back of the Jeep via a long hose...and yes, a lot of > blow by does come out. I also went for the smog test today and failed. > The hydrocarbons were good, CO was 0 at both 15 and 25 mph but the NO was > 1100 at 15mph (max is 750) and was 690 at 25mph. I also failed because > the timing was 0 btdc. The guy told me that the timing might be causing > the high NO but I am woried that it is the EGR not getting any ported vac. > I know the egr is not strong at 15 but I am sure a bit of egr would help. > It seems to work at higher speed. Any thoughts? Also, anybody have the > link to that trick to adjust timing without a timing light? > > Thanks again for all the help...glad you guts are sticking with me here! > > "steve" <None@nothing.com> wrote in message > news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... >> Hi All, >> >> I am not getting any ported vacuum going to my EGR valve. I checked the >> vac at the connection that is on the top of the Carter BBD - the one on >> the engine side of the carb and there is no vacuum at any RPM. Anyone >> have any ideas why? >> >> Thanks in advance, >> Steve >> >> > > |
Re: No Ported Vacuum
Steve, put the timing where it should be and it will help the NOx readings
some. The CO might go up a little, but obviously you're ok there now. The EGR more than likely does not function at 15 and 25 MPH even when things are working properly. The main design function of the EGR was to reduce HC emissions, but it might also help NOx somewhat. Like I said though, at the vehicle speed they are testing, I'm pretty sure the EGR is not doing anything. They are designed to open at higher speeds. If your EGR opens at low speed, your drivability will suffer dramatically. The other thing that causes many people to fail emissions testing is a catalytic converter that is too cold. If you can, take the vehicle for a good highway run right before you get to the test station and I would venture a guess that you will pass your test even with a non-functioning EGR. Chris "steve" <None@nothing.com> wrote in message news:b9xdf.26151$6e1.3342@newssvr14.news.prodigy.c om... > Here are some more answers/clues: The idle is very good and smooth even > down to 600rmp. I do have manifold vacuum. I did have oil puking into the > air cleaner but I took care of that a long time ago by venting the crankcase > out the back of the Jeep via a long hose...and yes, a lot of blow by does > come out. I also went for the smog test today and failed. The hydrocarbons > were good, CO was 0 at both 15 and 25 mph but the NO was 1100 at 15mph (max > is 750) and was 690 at 25mph. I also failed because the timing was 0 btdc. > The guy told me that the timing might be causing the high NO but I am woried > that it is the EGR not getting any ported vac. I know the egr is not strong > at 15 but I am sure a bit of egr would help. It seems to work at higher > speed. Any thoughts? Also, anybody have the link to that trick to adjust > timing without a timing light? > > Thanks again for all the help...glad you guts are sticking with me here! > > "steve" <None@nothing.com> wrote in message > news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... > > Hi All, > > > > I am not getting any ported vacuum going to my EGR valve. I checked the > > vac at the connection that is on the top of the Carter BBD - the one on > > the engine side of the carb and there is no vacuum at any RPM. Anyone > > have any ideas why? > > > > Thanks in advance, > > Steve > > > > > > |
Re: No Ported Vacuum
Steve, put the timing where it should be and it will help the NOx readings
some. The CO might go up a little, but obviously you're ok there now. The EGR more than likely does not function at 15 and 25 MPH even when things are working properly. The main design function of the EGR was to reduce HC emissions, but it might also help NOx somewhat. Like I said though, at the vehicle speed they are testing, I'm pretty sure the EGR is not doing anything. They are designed to open at higher speeds. If your EGR opens at low speed, your drivability will suffer dramatically. The other thing that causes many people to fail emissions testing is a catalytic converter that is too cold. If you can, take the vehicle for a good highway run right before you get to the test station and I would venture a guess that you will pass your test even with a non-functioning EGR. Chris "steve" <None@nothing.com> wrote in message news:b9xdf.26151$6e1.3342@newssvr14.news.prodigy.c om... > Here are some more answers/clues: The idle is very good and smooth even > down to 600rmp. I do have manifold vacuum. I did have oil puking into the > air cleaner but I took care of that a long time ago by venting the crankcase > out the back of the Jeep via a long hose...and yes, a lot of blow by does > come out. I also went for the smog test today and failed. The hydrocarbons > were good, CO was 0 at both 15 and 25 mph but the NO was 1100 at 15mph (max > is 750) and was 690 at 25mph. I also failed because the timing was 0 btdc. > The guy told me that the timing might be causing the high NO but I am woried > that it is the EGR not getting any ported vac. I know the egr is not strong > at 15 but I am sure a bit of egr would help. It seems to work at higher > speed. Any thoughts? Also, anybody have the link to that trick to adjust > timing without a timing light? > > Thanks again for all the help...glad you guts are sticking with me here! > > "steve" <None@nothing.com> wrote in message > news:41i9f.6192$D13.468@newssvr11.news.prodigy.com ... > > Hi All, > > > > I am not getting any ported vacuum going to my EGR valve. I checked the > > vac at the connection that is on the top of the Carter BBD - the one on > > the engine side of the carb and there is no vacuum at any RPM. Anyone > > have any ideas why? > > > > Thanks in advance, > > Steve > > > > > > |
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