vacuum lines coming off
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From: Atascadero, CA
vacuum lines coming off
99 Ranger 4.0 auto trans
The 2 vacuum lines from the pipe to the EGR valve are popping off after driving about a quarter mile. The lines go up to a box on the side of the intake manifold. There is no cel coming on when this happens but it results in a sever vacuum leak. Any ideas?
The 2 vacuum lines from the pipe to the EGR valve are popping off after driving about a quarter mile. The lines go up to a box on the side of the intake manifold. There is no cel coming on when this happens but it results in a sever vacuum leak. Any ideas?
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From: SW Va
99 Ranger 4.0 auto trans
The 2 vacuum lines from the pipe to the EGR valve are popping off after driving about a quarter mile. The lines go up to a box on the side of the intake manifold. There is no cel coming on when this happens but it results in a sever vacuum leak. Any ideas?
The 2 vacuum lines from the pipe to the EGR valve are popping off after driving about a quarter mile. The lines go up to a box on the side of the intake manifold. There is no cel coming on when this happens but it results in a sever vacuum leak. Any ideas?
Disconnect the vacuum lines to the EGR valve & apply vacuum to the diaphragm with a mighty vac, or the like & the diaphragm should hold a vacuum.
Does the CEL light up for its self check at KOEO, before you crank the engine???? If not, its burned out, or someone has removed it.
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Joined: Jan 2002
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From: suburban atlanta
Had a 4.0 in an A* that popped vacuum hoses off the manifold. Access would have been great if I were a giraffe with hands.. Way at the back, inaccessible from the front, rear or bottom. I should have replaced the hoses as they had been weakened by age and oil, but access was a bear. Tried clamps and that seemed to work, though I was not really happy with that solution. It was always "I need it now... ", so it couldn't be left long enough to do properly.
Pawpaw's idea of the EGR diaphragm sounds good. I had a '74 lima 2.3 that would pop a relief valve irregularly, and the valve would sometimes not spring back closed. Idled terribly until I re-seated the popoff. I think it was caused by backfires in the intake manifold. If you took your foot off the gas 'just right' you could make it pop. Same type of thing could be happening here, but aged and oiled vacuum lines make the slightest change in pressure enough to pop the lines from the fitting.
tom
Pawpaw's idea of the EGR diaphragm sounds good. I had a '74 lima 2.3 that would pop a relief valve irregularly, and the valve would sometimes not spring back closed. Idled terribly until I re-seated the popoff. I think it was caused by backfires in the intake manifold. If you took your foot off the gas 'just right' you could make it pop. Same type of thing could be happening here, but aged and oiled vacuum lines make the slightest change in pressure enough to pop the lines from the fitting.
tom
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From: Atascadero, CA
Actually what happened is that cat #3 came apart and plugged up #4. So new cats ordered and will be installed on Monday. Was thinking along the ideas mentioned when it completely plugged and made it easy to find. Thanks for the help.
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From: SW Va
More thoughts for consideration, let us know how it goes.
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Joined: Jan 2004
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From: SW Va
However if you've been driving it with the CEL lit & haven't pulled the codes to get a clue about whats been going on, or how the fuel trim looks, beware!!!!
With this mileage a good deal of scheduled maintenance is due, like O2 sensor replacement, plugs, wires, PCV valve, clean the MAF sensor, filters, fluids, ect, so if your of a mind to put it back on the road after replacing the cat converter, consider making sure All past & present due scheduled maintenance is up to date & all stored trouble code problems have been put right.
On the small engine E-10 troubles, most engines in the past 10-15 years have been engineered to operate on E-10 without problems & I have some moldy-oldy ones, including an 88 Mercury Marine engine thats used E-10 without problems for the past 10 years.
If you have small engines that are sensitive to E-10, consider treating your small engine fuel with the Marine Sta-Bil recipe & see how it goes.
More thoughts for consideration, let us know how it goes.
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From: Atascadero, CA
all scheduled maintenance is kept up on the truck. The best thing I have found on the small engines is to keep fresh gas in them and run them at least 15 minutes every 2 weeks at minimum.
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