How To: Change Spark Plugs & Clean The Throttle Body - Chevrolet Colorado & GMC Canyon Forum
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Old 04-03-2007, 12:21 PM   #1
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Lightbulb How To: Change Spark Plugs & Clean The Throttle Body

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A 355nation (CCP) presented by
MC

Project Name
How-To: Change Spark Plugs & Clean The Throttle Body

Project Description
Improving performance, idle and fuel economy

Skill Level
Easy to Moderate

Project Vehicle
Make: Chevrolet
Model: Colorado Z85
Year: 2006
Engine: 2.8L
Power windows: No
Sun Roof: No

Tool Needed
10mm socket
10mm end wrench
Flat Blade Screw Driver
7/32 socket - 5 or 5.5 mm depending on socket brand
5/8 spark plug socket
Intake cleaner


Project Time
2 hour’s or less

Project Cost
$45.00



Removing The Intake.

Remove the two bolts from the M.A.F. (Mass Airflow Sensor) and set it aside.



Remove the retaining band from the K&N fliter by loosening the flat head screw, and set the K&N aside.





Remove the 2nd retaining band from the K&N intake tube by loosening the flat head screw closest to the throttle body, set the intake tube aside.

Removing the Throttle Body.



Remove the 4 10 mm bolts from the throttle body. I used a socket on the top two, but didn't have a small enough socket for the bottom two, so I went with the 10 mm end wrench for those.

After you've taken out the 4 bolts, set them in your bolt tray and pull the throttle body towards you. You'll notice two things preventing you from removing it from the truck; a hose on one side and a plug just above that.



First the hose. Push the lever on the clip up, and pull the hose off of the fitment on the side of the throttle body. Next, for the plug, push the grey part of the purple/black clip in and slide it back towards you, it will slide right out. Where the grey piece was, there should now be a black push tab. Push this in and the plug will pull right off the throttle body. Don't be afraid to use a little force.



At this point, you can clean the throttle body with a can of TPI/Throttle body cleaner. Make sure to get both sides of the valve, and wipe down everything with a non-fibrous rag; you don't need anything getting into your fuel system. I also used this opportunity to clean my t.b. spacer. If you have one, make sure to clean in all those little grooves, alot of crap can accumulate in there.





Changing the Plugs.



The plugs on our truck are overly simple to remove. Take your 10 mm socket wrench and loosen the bolt at the bottom of the tear drop. After you've loosened it to the point of "free turning," pull up on the tear drop shaped plug (spark plug boot), using a rocking motion.



This will expose the spark plug.



Use the 5/8" spark plug socket and remove the plug, turning the wrench counter clock wise.



Firmly place the new plug into the socket and put anti-seize on the threads. Place the new plug into the hole and screw it in using a clock wise motion.



After putting in the new plug, align the bottom of the boot with the top of the plug and push the boot back into place. Tighten the 10 mm bolt and move repeat the process for each plug.

The only problem I had was with the front most plug as the 10 mm bolt resides halfway under a plastic wiring harness box.



This box, however, is only held on by two small push pins. You can easily loosen this box on one side, like I did, or remove the entire thing by using a little bit of effort and pulling up firmly on either side of the box. Pulling up one side gave me enough room to remove the 10 mm bolt and replace the plug.



After you're done with the plugs, reverse the directions and put everything back together. If you're using this as a guide to install your T.B. spacer, I've included pictures of installing that and aligning it to the throttle body below. I put on bolt in the bottom corner to help keep the apparatus aligned while I reinstalled it, once the whole thing was on, I used the same method you use when tightening anything with more than one bolt; tighten one corner a little bit, then the opposite corner. Then, do the same in a cross pattern for the remaining bolts, making sure all of them are snug before torquing any of them:





EDIT: Make sure to reverse the throttle body spacer from what's shown.

Last edited by brewer15650; 10-30-2008 at 11:25 AM.
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Old 05-21-2007, 10:48 AM   #2
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Re: How To: Change Spark Plugs & Clean The Throttle Body

Good work.... what plugs do you recommend!
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Old 05-22-2007, 12:42 PM   #3
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Re: How To: Change Spark Plugs & Clean The Throttle Body

These dude:

http://www.spark-plugs.co.uk/pages/t...park_plugs.htm

I did the bosch platinum 2's because they were out of the iridiums for some stupid reason.
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Old 05-22-2007, 01:07 PM   #4
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Re: How To: Change Spark Plugs & Clean The Throttle Body

While you're in there you will want to clean the MAF also. I believe it's two 4.5mm bolts and a can of CRC MAF cleaner - let the MAF dry completely before you reinstall.
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Old 07-25-2007, 09:40 PM   #5
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Re: How To: Change Spark Plugs & Clean The Throttle Body

i saw the bosch platinum 2's the other day and they said they didnt need any gaping, and i wasent shure about them. how have they preformed so far for you?
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Old 07-27-2007, 06:48 AM   #6
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Re: How To: Change Spark Plugs & Clean The Throttle Body

good write up doode

i must say you got balls b/c there is no way im taking pics of under the hood and posting em. just way too dirty under there.
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Old 01-25-2008, 06:41 AM   #7
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Re: How-To: Change Spark Plugs & Clean The Throttle Body

I had a GMC jimmy that was sputtering like that a stops and when I gave it gas it would stall worse, found out it was the EGR valve sticking Very common In GM vehicles so said the technician. but thats an old story now, I havent had any problems with the Colorado.
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Old 01-25-2008, 06:45 AM   #8
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Re: How-To: Change Spark Plugs & Clean The Throttle Body

By the way I do remember good advice from the tec, Hit the EGR valve on the side with a hammer hard enough to show it whos boss but not hard enough to damage it. make sure your truck is on, and if you hear that the idle changes then your EGR valve is stuck in place and its time for a new one.
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Old 01-25-2008, 12:16 PM   #9
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Re: How-To: Change Spark Plugs & Clean The Throttle Body

Great write up cuz i was lookin the other day and was lost for a sec. This cleared it up perfectly!
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Old 01-25-2008, 09:19 PM   #10
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Re: How-To: Change Spark Plugs & Clean The Throttle Body

OMG..wtf is up with reopening dead posts....arrgg...
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Old 01-26-2008, 12:09 AM   #11
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Re: How-To: Change Spark Plugs & Clean The Throttle Body

HOORAY! something to do tomorrow! lol, good writeup
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Old 11-13-2008, 03:05 PM   #12
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Re: How-To: Change Spark Plugs & Clean The Throttle Body

what does the hose do tahts connected to the throttle body? I broke the clip on it.
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Old 11-13-2008, 03:14 PM   #13
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Re: How-To: Change Spark Plugs & Clean The Throttle Body

Quote:
Originally Posted by Mxman38 View Post
what does the hose do tahts connected to the throttle body? I broke the clip on it.
That is part of the EVAP system that allows vapors from the fuel tank to be burnt up in combustion.
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Old 11-13-2008, 03:35 PM   #14
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Re: How-To: Change Spark Plugs & Clean The Throttle Body

I have 3 left over plugs. Special order so I had to get 8. They are the autolite ones if anyone is interested...
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Old 01-22-2010, 05:57 PM   #15
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Re: How To: Change Spark Plugs & Clean The Throttle Body

i bought bosch platinum 2
i dont need to gap them at all?
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Old 01-24-2010, 06:40 PM   #16
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Re: How To: Change Spark Plugs & Clean The Throttle Body

I did this the other day and I forgot to pug my maf back in .
here are some pics of my f'ed up old plugs and my girlfriend cleaning my throttle body.


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Old 01-24-2010, 08:00 PM   #17
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Re: How To: Change Spark Plugs & Clean The Throttle Body

I just cleaned my TB yesterday. I cant believe how nasty it was after 45K miles. And dont let the outside of the butterfly fool you when you take the intake off. The inside of mine was super nasty behind the flap but you cant realy tell until you take it off.
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Old 01-27-2010, 11:18 PM   #18
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Re: How To: Change Spark Plugs & Clean The Throttle Body

so after driving a while WITH the maf i have come to the conclusion that everybody that looks at this and thinks about doing this should absolutely do it.
it makes a huge difference in the way the truck pulls... i havent noticed a differende from a stop but going uphill and accelerating at high speeds there is a huge difference
my friend thinks it is a placebo affect but he is an idiot this shit really helps.
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Old 02-06-2010, 12:16 AM   #19
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Re: How To: Change Spark Plugs & Clean The Throttle Body

do I need to remove PCMB fuse before I remove TB?
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Old 02-06-2010, 12:19 AM   #20
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Re: How To: Change Spark Plugs & Clean The Throttle Body

Had mine of 4 times without removing the fuse, no issues ever.
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