Question about 2006 Chevrolet Trailblazer

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I am having trouble locating the vacuum hose, and the check engine light goes on and off every other couple of days. Plus I noticed the rpm guage keeps going up and down while at a light

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Next time that light comes on, check the code that's popping up. The light is indicating a code, which in turn directs you in the direction of the problem. If you don't have code reader, bring your vehicle to a place like autozone that will check the code for free. Let me know what the code is. Without this, we're just shooting in the dark, with the many different problems that would cause this.

I was code chasing for a long time with mine, (light was intermitent) until I finally bought a code reader myself. Light popped on, I plugged it in and grabbed the code instantly.

Posted on May 24, 2011

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Posted on Jan 02, 2017

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My '04 blazer has been revving erratically when I start it. Goes back to normal after a couple minutes of warming up, but when I drove without the warmup it was revving up on its own even when I h


I had an 04 blazer. There is an undocumented problem with leaks in the intake manifold. The original gasked was low quality. I would expect that you have a vacuum leak in the intake manafold. My problem was a coolant leak. Replacing the manifold gasked fixed it.
If not this, make sure you do not have any creaks or opening in the air hoses that fed the throttle body.

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I need a vacuum line diagram fo a 1996 Chevy Lumina, 3.1. One line that is not connected to anything, is located at the top of the engine.


Sorry I don't have the diagram, but I do have a diagram of the engine and component locations. Your vacuum system is fairly simple. You have a MAP sensor attached to the air cleaner. I have pasted a picture below. It has one electrical connector and one vacuum hose that goes to the intake manifold or the throttle body.
Behind the right headlight is your evap canister. This will have a hose or line running to the fuel tank. Then it will have another hose going to the purge valve. The purge valve should be close by and it has a connector plus another hose that goes to the intake manifold.
Then you have the PCV hose that goes from the PCV valve in the valve cover to the air cleaner or intake manifold. I think yours just has a hose from the air cleaner and the rest is internal.
There is one more vacuum hose, and that is the bog one that goes from the intake manifold (or throttle body--looks to me like there are a couple of vacuum ports on the back side of the throttle body, and there may be a "T" on one of the hoses) to the brake booster. It this one was off, the engine would not run, as the vacuum draw is large. Please let me know if you cannot figure it out from these instructions and provide a picture, if you can.

MAP sensor:
jturcotte_653.jpg

purge valve:
jturcotte_654.jpg

jturcotte_2455.gif
jturcotte_2456.gif

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My 1995 subaru legacy lsi cuts out when I rev the engine around 1 rpm. Plus the check engine light is on. I took it to the dealership and they couldn't fix it, but they got a code from the check engine...


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Hi there i have a 1987 turbo ll ,cars only have 22,000 miles original miles everything is stock,every time i start the car the rpm goes up to 2500-3000 rpm and its stay like that all day even if i shut off...


Hi,

Check the vacuum hoses and valves in your engine.

Sounds like the EGR valve, but but check the vacuum hoses, it is connected to all the valves in the intake system.

Then tell us afterwards if there are changes in the rpm!


Hope that helps you out!

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91 S10 rough idle, stalling ALDL problems


Make sure there is no vacuum leaks.


Vacuum leak at intake manifold and vacuum hose.

Bad Idle Air Control Motor (IAC)

Low compression (170 psi + is OK)

Start cleaning and repair these trouble spots and see is there any improvement.

====

For more advance DIY'er then you may try this.

Use a can of Berryman carburetor clean to locate the vacuum leak.


SEE SAMPLE PICTURE HERE


This is a 20-30 minutes job.

Vacuum leaks can occur in following locations.


Intake manifold AND/OR vacuum lines.


Intake manifold is not accessible unless the engine head if off.

You can still check the potential leak by spraying some Berryman near the intake manifold.

Listen for rpm increase after you introduce the Berryman (FUEL) at idle.


Do the same starting from the brake booster unit (the round unit) on the drive side fire all.

Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.

Get a friend to HEAR the RPM increase or monitor for RPM on the tech.

DO NOT AIM the Berryman into any heat source.


PLEASE RATE my answer if it is useful to you.

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1 Answer

There is a green tube coming off the side of my egr valve and it seems to be cut will replacing this tube solve my check engine problems


Hello Malcolm.
The vacuum line to the EGR will certainly cause your check engine light to come on.
The vacuum hoses on these cars become brittle with age, I generally replace broken lines with a quality rubber hose available at your local auto supply.
The check engine light may take a while to turn off without clearing service codes.
If the light is still on after a couple days of driving you may have other issues turning on the check engine light.
Hope your repair goes well for you.

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you probly have a vaccum leak they are hard to find but make a very noticable difference when you find them. touch all small hoses untill you find something that changes

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Your loose hose from the EGR might plug into the back side of the throttle body...I'm not sure of the 3.4 liter setup.

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Is it in park or neutral? I noticed the same thing on mine and realized that there is a rev limiter on the 02 3.8v6 that will not allow it to go over 4000rpm.

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