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Exhaust causing truck to shake?/Clogged exhaust?
The Gwagen is throwing us another head scratcher.
Ever since we got the truck running we noticed that it would shake quite badly at idle. This shaking could be made worse if you lowered the RPMs all the way down. The shaking would always go away under throttle. I assumed that the engine mounts were bad until earlier this week. We pulled the useless EGR off the truck and (Surprisingly) the shaking at idle stopped. We plugged the intake manifold and the exhaust manifold. Here is where things get odd. Today my father took it out and while driving down a hill in a lower gear (3rd I believe) it expelled the exhaust manifold plug. (Copper pressure fitting but it was in tight) My question is this- Exhaust, like any other gas or fluid, takes the path of least resistance. So why would the plug be shot out as opposed to the exhaust just making it's way through the pipes? Clogged muffler perhaps? (Engine is a 617 naturally aspirated)
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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out 1990 300SEL Smoke Silver (Parting out) 1991 350SDL Blackberry Metallic (481) "The thing is Bob, its not that I'm lazy...its that I just don't care." |
#2
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The muffler could be clogged. Is there an easy spot to disconnect the exhaust up front? If so you can do the shop vac test... unhook the exhaust from the engine, and attach a shop vac to the tailpipe. The tone of the shop vac shouldn't go up much... if it does there's a restriction.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#3
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Quote:
haha damn, we already put another replacement plug in a few hours ago. (Sure was fun driving it when it was that loud ) I'll have to double check but I think there is a connection at the bottom of the down-pipe.
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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out 1990 300SEL Smoke Silver (Parting out) 1991 350SDL Blackberry Metallic (481) "The thing is Bob, its not that I'm lazy...its that I just don't care." |
#4
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been there done that - and yes your exhaust is clogged - my car's cat convertor was completely blocked to the point that it would not even rev past 2000 rpm and shutdown due to excess crankcase pressure.
a simple check is that the EGR should not be blowing smoke if its forced open at idle speed. If you remove the front pipe and check you will find that the engine will behave perfect.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#5
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Quote:
Well too late to check the EGR as it's gone but I seem to remember seeing a bit of smoke coming out of the intake side...... Great something else to deal with now . Please tell me there is a simpler (Read cheaper) fix then having to replace the entire exhaust......
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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out 1990 300SEL Smoke Silver (Parting out) 1991 350SDL Blackberry Metallic (481) "The thing is Bob, its not that I'm lazy...its that I just don't care." |
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