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  #1  
Old 09-03-2014, 11:58 AM
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No power

My girlfriend has a 2007 grand cherokee Laredo 3.7.It is going through gas like crazy and has no umph on take off.I was going to clean the sensors but then i realized it is all encased.If i got a new throttle body and put new plugs in it,could that improve performance?
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  #2  
Old 09-03-2014, 12:25 PM
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Re: No power

Have you checked for any DTC's? It could be lots of things, but if it's guzzling gas real bad, I'd look at the O2 Sensors. But first make sure all the other maintenance is up to date. If the vehicle has more than about 75000 miles on it, the O2's could be suspect.
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Old 09-03-2014, 12:33 PM
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Re: No power

Ok,I will check the O2 sensors.What are signs of a bad throttle body?
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Old 09-03-2014, 12:56 PM
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Re: No power

Not too likely it's the throttle body. Check for oil contamination behind the butterfly. If you have poor idle quality and/or stalling, there could be a problem with the idle air controller, again usually contamination
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Old 09-03-2014, 01:03 PM
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Re: No power

Quote:
Originally Posted by jeepgcoman View Post
Not too likely it's the throttle body. Check for oil contamination behind the butterfly. If you have poor idle quality and/or stalling, there could be a problem with the idle air controller, again usually contamination
In addition to the O2 sensors, check for plugged or deteriorating cat.

Any scrunched exhaust pipes?

How long since been smogged, and are you in a state where they will give you the numbers?

What fuel are you using and has it changed recently?

Also check to see if there is a Prius stuck in the undercarriage...
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Old 09-04-2014, 01:04 AM
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Re: No power

Thank you for all of the information.I forgot to mention that when the engine is revved it takes longer than it should to come back down.I figured dirty TPS.Cant clean it because its an encased TB.
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Old 09-04-2014, 02:38 AM
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Re: No power

id start with the o2 sensors and move to the spark plugs and map senor if new o2's don't solve it
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Old 09-04-2014, 05:05 AM
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No power

Take your vehicle to a mechanic that you trust, and explain the problem to them. They should have the tools and expertise to help you out.

Thank you strongjeff for pointing out that this forum has no room for attempts at juvenile humor. I will never go that route again.
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Old 09-04-2014, 05:19 AM
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http://www.tornadoair.com/

No, seriously... Don't ever buy that for any reason
This posts isnt relavent to the op's problem
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Old 09-04-2014, 12:10 PM
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Re: No power

I looked under the Jeep and only found 3 oxygen sensors,2 of which i cant see how to get to the electrical clips.They seem to be way up behind the engine.Shouldnt there be 4 sensors?
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Old 09-04-2014, 12:29 PM
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Re: No power

Not sure about your jeep, but the ones you have to check are the upstream sensors (before cat). The after cat sensor(s) is(are) for catalist effectivity monitoring.
Do you have a scanner, so that you can see what the O2 sensors are doing now? The O2 sensor voltage should go up and down from 0.2V to 0.8V. The more rapid this goes, the better. A steady or slowly switching 1-1 and 2-1 sensor means that they must be changed.
I would also check the fuel pressure at the rail. A too low pressure will give power problems and increased fuel consumption.
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Old 09-04-2014, 03:27 PM
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Quote:
Originally Posted by newlife8981 View Post
I looked under the Jeep and only found 3 oxygen sensors,2 of which i cant see how to get to the electrical clips.They seem to be way up behind the engine.Shouldnt there be 4 sensors?
Yup 1 on each side just after the manifolds and one on each side just after the cats
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