2005 Envoy 4.2 in line 6 cyl, rough idleing,

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bobmcelyea
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2005 Envoy 4.2 in line 6 cyl, rough idleing,

Unread post by bobmcelyea » Sun Sep 28, 2014 3:26 pm

Rough idling engine, accelerats fairly good but does lack power, have replaced spark plugs, boots, air filter and air temp sensor. Can not locate the MAF sensor. Cleaned the MAR sensor to no avail.
have pulled plugs twice and checl boot springs.
Code shows 0300 mutli/randon cylinders misfires but trk runs out fairly good. Help??

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carriedi
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Re: 2005 Envoy 4.2 in line 6 cyl, rough idleing,

Unread post by carriedi » Sun Sep 28, 2014 5:41 pm

if you have a tool to look at codes does it look at the data stream too? look at your fuel trims to see if the engine is getting enough fuel. If the computer is adding fuel to make up for a problem, check your fuel pressure or try cleaning the injectors.
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butchkaz
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Re: 2005 Envoy 4.2 in line 6 cyl, rough idleing,

Unread post by butchkaz » Thu Oct 02, 2014 11:01 pm

bobmcelyea wrote:Rough idling engine, accelerats fairly good but does lack power, have replaced spark plugs, boots, air filter and air temp sensor. Can not locate the MAF sensor. Cleaned the MAR sensor to no avail.
have pulled plugs twice and checl boot springs.
Code shows 0300 mutli/randon cylinders misfires but trk runs out fairly good. Help??
This link has info on Trailblazer rough idle
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kelly321
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Re: 2005 Envoy 4.2 in line 6 cyl, rough idleing,

Unread post by kelly321 » Thu Apr 23, 2015 8:26 pm

When I am stopped at a stop sign or stop light and press the break there is a loud noisy vibration when i press the break. this happens only in drive, not in other gears. can anyone please help. I do have high millage on this truck.
Kelly

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carriedi
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Location: Oregon

Re: 2005 Envoy 4.2 in line 6 cyl, rough idleing,

Unread post by carriedi » Fri Apr 24, 2015 10:28 am

tough to say without hearing of feeling the noise/vibration. It could be some part of your engine or exhaust is touching the body when the engine is torqued over from being in drive. You should have some listen for the noise when you hold the vehicle in gear and it's making the noise, to see where the sound is coming from.
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