Question about 2003 Chevrolet TrailBlazer

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I have a small 90deg rubber boot on the top of my engine on my 2003 trailblazer that has dry rotted and is causing my engine to have a rough low idol. I went to our local auto parts store and they did not know what this part was. Can you help?

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  • Chevrolet Master
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Possible it's attached to your throttle body? Clean your throttle body while you're there, will get rid of rough idle.

Posted on Nov 17, 2010

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Posted on Jan 02, 2017

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1 Answer

What is causing my unintended acceleration in my 03 trailblazer


The brake booster can do this. It is the big black circular thing on the drivers side, at the fire wall. A small hole in the diaphragm. Hard to find and diagnose. These aren\'t cheap. Get one at a junk yard... New ones are $200 to $500. Small vacuum leaks will always cause an acceleration. big ones cause a misfire or really rough idle.

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Is the check engine light on? If so have you checked for codes? Do you have a P0171 and P0174 codes?

If so, and your symptom supports this, you may have a vacuum leak. This could be anything from bad plenum gaskets to a rotted out rubber elbow. Normally I would suggest using carb spray to find the vacuum leak but carb spray is flammable and since the coils are on the top side of the engine you need to be really careful not to get it near the coils as the engine could catch fire.

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How do you change the low beam light on 2006 chevy trailblazer?


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These hoses are starting to dry rot which is causing the small "holes". They're easy enough to replace so go ahead and swap them out.

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Oil coming from the area where rubber hose goes


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Ford f-150 2003 4.6 liter


I had a similar problem, check engine light would come on and all pointed to the mass air flow sensors and oxygen sensors. I was searching the internet to locate those little suckers when I ran across someone that said to check the little L-shaped rubber boot at the top of the engine near the firewall. I said what the heck, I went out and finally found it, I put my thumb on the hose and it was caved in. I put some pressure on the hose and it snapped in two. I drove my other vehicle to Autozone and they had a L-Shaped rubber hose with the same fit but bigger, so I cut it to size and I have not had one problem. I did replace another hose that looked dry rotted and checked all my vacuum lines to ensure that they were attached. This was over 3 months ago, I am not burning oil like I was and I am getting better gas mileage and the ride is superb. $7 for the hose. To replace all of those sensors would have cost me over $400. This may not be your problem but it would not hurt to check. Good Luck!

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