Question about 2004 Chevrolet TrailBlazer

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I had a cracked exhaust manifold after i replaced it i have a major loss in power and the code 0172 is coming up what does this mean

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Look for a vaccum leaks, check 02 sensors, check Map Sensor, make sure the pcv hose to the resonator is hooked back up. These are the simple things to check that would cause this code (running rich).

Posted on Mar 21, 2011

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Posted on Jan 02, 2017

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Code 0172, what am I looking 4 on 4.2 in 05 Chevy Trailblazer EXT?


code P 0172 ( if you are using an OBD-11 scanner ) refers to system too rich bank 1====causes --intake blocked --EVAP canister purge valve ---fuel pressure excessive ---EGR valve ---injector/s-- HO2S ( heated oxygen sensor in the exhaust manifold or pipe before the cay converter)
if the engine is performing well, the the first unit to replace is the HO2S as it controls the air/fuel mixture

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Code 0172 pop up on 1998 Volvo s70 and the maf code didn't or the o2 code didn't what could it be?


code p 0172 refers to system too rich, bank 1===causes ---intake blocked --EVAP canister purge valve ,---fuel pressure ---EGR system---injector/s---heated oxygen sensor (HO2S -the one in the exhaust manifold before the cat converter)

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Why does my manifold turn red when I already changed the catalytic converter on my 2000 Toyota Avalon


Usually, a red manifold means that you have a lot of unburned fuel going into the exhaust stream. Most likely cause of this would be a cracked or warped exhaust valve or valve seat. A compression check of the engine cylinders can confirm a leaky valve quickly. Another possibility would be a blockage in the exhaust stream. Converters can break up and their parts can move through the exhaust and clog up the muffler. In theses cases, however, there is usually a significant loss of power on acceleration and often both the converter and exhaust manifold will get red hot.

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1 Answer

Engine power problem


Yes, the open circuit can indeed cause your loss of power and the appearance of running rich.

Likely caused by replacing the exhaust manifold. Check wires to injectors.

May 22, 2015 | 1996 Jeep Grand Cherokee

1 Answer

Loss of engine power, loud whistling noise


Exhaust manifold leak? That's not common. You talking about the VVT near the manifold at the top of engine above the power steering pump? Yes indeed, AC Delco is the only one our engines love. 41-103. Obviously you have P0304, what other codes?

Mar 16, 2017 | 2002 Chevrolet TrailBlazer

1 Answer

Had exhaust manifold replaced since then my 2001 caravan bucks and blows black smoke little to no power


if you replaced the manifold because it was cracked the look for a plugged cat convertor..the cracked manifold was probably letting the exhaust escape..now it builds too much back pressure

Jul 24, 2012 | 2001 Dodge Caravan

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Blowing anitfreeze out the tailpipe. I know this means a head gasket. When the engine runs, it blows antifreeze out the passenger side of the engine at the exhaust manifold by the middle cylinder. Does...


could be just head gasket and bad exhaust manifold gasket (coolant leaks past head gasket into exhaust port then leaks out of exhaust manifold gasket)
or it possible that head is cracked too
Only way to know for sure is to remove head and inspect it

Jan 06, 2011 | 1986 Ford Bronco II

1 Answer

LOSS OF POWER EXHAUST LEAK WHERE MANIFOLD PIE CONNECTS TO EXHAUST


if the exhaust is just cracked i wouldnt worrie about the engine because you still have a lot of backpressure and it should not burn a valve. but replacing the header is a good idea if the header itself is cracked. and to tell you the truth your mechanic should be responsible for the cost of the repair since he broke it in the first place. In the shop i own if one of my mechanics breaks something it comes out of my pocket to replace. its all part of the job sometimes things just happen and you have to take the responsibility for it

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Exhaust leak/problem


I recommend replacing the exhaust manifold gaskets and the donut gasket as well. I would also inspect the cat for leaks and breaches on the sides as well to be safe.

May 26, 2009 | 2000 Mitsubishi Montero Sport

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