Last post on Mar 06, 2012 at 12:09 PM
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Exhaust, Diesel, Fuel Efficiency (MPG), Car Warranties, Coupe, Convertible, Hatchback, Truck, Sedan, Wagon, SUV, Van
#1 of 142 All About Exhaust Systems
by MrShift@Edmunds HOST
May 10, 2005 (8:25 am)
This forum is specifically for exhaust system questions about any car. This includes catalytic converters, mufflers, tailpipes, hangers, bad smells, 02 sensors, smoke and possible drivability issues related to bad catalytics.
The forum is NOT for modifications (See our new "Speed Shop" Board!!)or for engine problems....just from the exhaust manifold on back, folks!
#2 of 142 1994 Mercury Villager Nautica
Aug 04, 2005 (2:47 am)
It sounds like a chopper, has no acceleration, & is killing us with carbon monoxide in the car when our family is going somewhere. A leak in the exhaust near the engine would explain the carbon monoxide coming into the vehicle. The chopper sound, too, is under the front end. What I can't explain, is the lack of power & how that correlates with an exhaust system. Am I on the right track? Should I let a pro tackle this one? I can do a few things, maybe.
#3 of 142 Re: 1994 Mercury Villager Nautica [magilln]
Aug 04, 2005 (4:54 am)
Would a cracked exhaust manifold cause these symptoms?
#4 of 142 Re: 1994 Mercury Villager Nautica [1racefan]
by MrShift@Edmunds HOST
Aug 04, 2005 (7:39 am)
Yes indeed, or a bad exhaust manifold gasket or bad exhaust manifold "doughnut" or connector (where the exhaust header connects to the exhaust system before the catalytic).
#5 of 142 Re: 1994 Mercury Villager Nautica [Mr_Shiftright]
Aug 04, 2005 (7:53 am)
In terms of his other question of how it would correlate to the lack of power - would that be because of the engine not getting the back pressure it needs from the exhaust system due to a leak?
If it were my van, and it were otherwise mechanically sound, I would just spring for a whole new exhaust system (from manifold to tailpipe). Again, this is assuming the van is in otherwise good shape, and you think it can provide several more years of reliable service.
#6 of 142 Re: 1994 Mercury Villager Nautica [1racefan]
by MrShift@Edmunds HOST
Aug 04, 2005 (8:18 am)
Yeah, lack of back pressure would be one explanation---that really depends on the engine, but sure...many a junior hot-rodder has put on too large a diameter exhaust system, only to find a noticeable DROP in horsepower.
But the loss of power could also be co-incidental. You could have other engine driveability issues going on. So you can't really count on the fixed exhaust system curing the engine issues.
#7 of 142 Re: 1994 Mercury Villager Nautica [magilln]
Aug 04, 2005 (8:36 am)
Mercury Villager and it's twin the Nissan Quest are chronic for broken exhaust manifold studs. The manifolds warp, which puts excessive strain on the studs and eventually snaps them. A major PITA to fix, requires manifold removal, drilling out the broken studs in the heads, and usually requires the manifolds to be replaced or planed flat again.
#8 of 142 Re: 1994 Mercury Villager Nautica [1racefan]
Aug 05, 2005 (5:43 am)
He doesn't need a whole new exhaust system, just a new header. Why spend the extra money on parts that aren't broken?
The symptoms (exhaust in the engine bay, loss of power, sounds like a chopper) are classic cracked header issues. I know because I just replaced the very badly cracked one on my Jeep's straight-six (these engines are notorious for this problem). I knew it had a tear near the collector but it had another worse one higher up:
Look around the header as best you can with a flashlight, especially where it attaches to the engine block. This is not a cheap repair, though, but it's the labor and not the technical part that makes it so expensive, it's all grunt work. I was quoted $800-$1000, equally split between parts and labor, from the stealership and two different shops. I went aftermarket instead and picked up one from 1A Auto Parts for $160 or so, including a lifetime warranty on the part, and had a local boy-racer type install it (he did have ASE certification) in his garage for another $160 cash. Got it back yesterday and all problems are solved, I've got at least 20 more HP back and it's so very quiet now.
#9 of 142 Re: 1994 Mercury Villager Nautica [goducks1]
Aug 05, 2005 (5:55 am)
I was just saying that if it were mine, I would replace the whole system. Again, that is based on a few assumptions - that the van is in otherwise good shape and that he has never had any exhaust work done previously - and that I was going to keep it for several more years. I just figure on an 11 year old vehicle, I would rather go ahead and replace the exhaust system and be done with it. Plus, I guess I sometimes take for granted the fact that there are several smaller repair shops in my area that are VERY reasonable, and do good work. But I agree with your comment about the dealerships - if it isn't warranty related, I try to stay away from those guys.
#10 of 142 Re: 1994 Mercury Villager Nautica [goducks1]
Aug 05, 2005 (6:04 am)
The manifolds usually don't crack on 3.0L Villagers, they warp and snap the studs which hold them onto the cylinder heads.