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2.7 severely under powered... Anyone have this problem?

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Old 12-25-2014, 04:11 AM   #1
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2.7 severely under powered... Anyone have this problem?

I'm trying to help my dad out with his 03 tacoma 2.7. He recently had the egr line blow off so he fixed that but now the truck seems like it's only running on 2 cylinders. With your pedal to the floorboards it can barely get passed 30mph. Im going to check spark this weekend but is there anything else you guys recommend looking at? Not getting any cels either. Im puzzled.


Thanks in advance
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Old 12-25-2014, 06:59 AM   #2
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Does the truck have a rough idel or fluctuate rpms when ur ideling. If it does you can not be getting the right mixture. Air fuel wise.
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Old 12-25-2014, 07:00 AM   #3
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That can be a cause loss of power.
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Old 12-25-2014, 11:57 AM   #4
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High mileage? Venturing a guess here.
Did the EGR blow off the exhaust manifold? If so it could be a clogged catalytic converter. Backpressure would've caused the EGR line to blow off. It was able to evacuate exhaust with the egr line off. Now that it's fixed it can't push out exhaust gases.
Although I think a clogged cat might have thrown a code before completely clogging up.
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Old 12-25-2014, 12:00 PM   #5
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Hey.... I was also thinking that it could be a clogged Catalytic converter.
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Old 12-25-2014, 12:11 PM   #6
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Disconnect the cat. It will be loud but then you can road test it.
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Old 12-25-2014, 12:19 PM   #7
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Would it be worthwhile to conduct an exhaust backpressure test?

http://www.aa1car.com/library/exhaust_backpressure.htm
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Old 12-25-2014, 12:33 PM   #8
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Vacuum gauge will tell you all you need to know.
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Old 12-26-2014, 10:21 AM   #9
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Quote:
Originally Posted by bobbyhill View Post
Does the truck have a rough idel or fluctuate rpms when ur ideling. If it does you can not be getting the right mixture. Air fuel wise.
It idles just fine
Quote:
Originally Posted by Fordless View Post
High mileage? Venturing a guess here.
Did the EGR blow off the exhaust manifold? If so it could be a clogged catalytic converter. Backpressure would've caused the EGR line to blow off. It was able to evacuate exhaust with the egr line off. Now that it's fixed it can't push out exhaust gases.
Although I think a clogged cat might have thrown a code before completely clogging up.
It has about 110k on it. I was also thinking a clogged cat. It did blow off the manifold. Would it hurt to disco the egr line again and run it for a bit to see if that was the cause? He said it started acting like this after he fixed the hose. It also smells like gas after you get done driving it which also makes me think its the cat. You are right though... I would think it would throw a code as well.
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Old 12-26-2014, 10:32 AM   #10
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Quote:
Originally Posted by sawed off View Post
Disconnect the cat. It will be loud but then you can road test it.
Agreed, but for clarity, disconnect at the front side, not the back.

IE create the exhaust leak before the cat.

If you can tap the cat with a hammer or such, and you hear rattling, that's another indicator of failure.
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Old 12-26-2014, 10:45 AM   #11
First I derp.. then I herp
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Quote:
Originally Posted by Clearwater Bill View Post
Agreed, but for clarity, disconnect at the front side, not the back.

IE create the exhaust leak before the cat.

If you can tap the cat with a hammer or such, and you hear rattling, that's another indicator of failure.
thanks. I will give this a try.
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