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2004 GP 3800 Series III will stall upon starting unless throttle given?



I couldn't beleive how dirty mine was either. It seems to run better now and have better throttle response. It still stutters or stumbles a bit when I quickly snap the throttle open though for some reason. It would be nice to get that one solved as well.
 
WhiteGT said:
I couldn't beleive how dirty mine was either. It seems to run better now and have better throttle response. It still stutters or stumbles a bit when I quickly snap the throttle open though for some reason. It would be nice to get that one solved as well.
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Did you use a toothbrush to scrub all around? If not you may still have a hangup, also spray the area around the pivot shaft good as well.;)
 
Randy_W said:
Did you use a toothbrush to scrub all around? If not you may still have a hangup, also spray the area around the pivot shaft good as well.;)
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Yep, I scrubbed it out good with an old toothbrush, looked almost like new in there when I was done. Still, when I snap the throttle quickly it stumbles before it revs up for some reason.
 
I notice a little stutter on my '00 GT if I mash the puddle down. It's like the entire engne cuts off for about a 1/4 second. I figure my tb has to be downright nasty. :D
 


Deezul_AwT said:
I notice a little stutter on my '00 GT if I mash the puddle down. It's like the entire engne cuts off for about a 1/4 second. I figure my tb has to be downright nasty. :D
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Mine is still doing doing the brief stutter, exactlly as you described even after cleaning the very dirty throttle body. I am wondering if it is a sensor causing the problem. I have scanned the car a few times already but nothing ever shows up.
 
WhiteGT said:
Mine is still doing doing the brief stutter, exactlly as you described even after cleaning the very dirty throttle body. I am wondering if it is a sensor causing the problem. I have scanned the car a few times already but nothing ever shows up.
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I'll have to try the same thing in my Impala and listen for it. Might not be able to hear it over the exhaust, though. :th_laugh-lol2:
 
Stupid question, but can anyone do a quick 1. 2. 3. writeup for me on how to do this?

Is it as simple as taking off the airbox, and tubing and the TB is right there then I just scrub her down?

Any info would be greatly appreciated.

Steve
 
skubasteve! said:
Stupid question, but can anyone do a quick 1. 2. 3. writeup for me on how to do this?

Is it as simple as taking off the airbox, and tubing and the TB is right there then I just scrub her down?

Any info would be greatly appreciated.

Steve
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Your best bet would be to disconnect everything from the throttlebody and remove it completelly before cleaning it. If you just take off the airbox and tubing, there is a screen over the opening of the throttlebody. If you have some basic knowledge of working on engines you should be able to manage it fairly easily.
 
WhiteGT said:
Your best bet would be to disconnect everything from the throttlebody and remove it completelly before cleaning it. If you just take off the airbox and tubing, there is a screen over the opening of the throttlebody. If you have some basic knowledge of working on engines you should be able to manage it fairly easily.
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The MAF screen for the Series III engines isn't in the throttle body (since the MAF isn't in the throttle body). Taking off the tubing leaves the throttle body wide open.
 


I just cleaned out my TB this past weekend. God it was basically completely black inside. I can't believe how ditry it was. I used Chemtool B-12 to clean it out. Jesus, I didnt even need a toothbrush to help with the cleaning, the inside of the tb was sparklingafter about 15 total seconds of spraying. I'm going to be using the crap for the rest of my life.
 
Cleaning the throttle body on my son's 2004 GP GT2 solved his start/stall problem also. Thanks for the help from this forum! Prior to cleaning, using my Autoenginuity ODBII scan tool I could see that the throttle plate was open 7 percent at idle. After cleaning it was at 1 percent. My conclusion is that the plate could not close completely due to the carbon build up. Also, while cleaning, I noticed that with the engine off, that the throttle plate rests at about 15 percent open, apparently with springs or something inside the throttle plate motor (not sure how it's done). If I moved the throttle plate closed with my finger, it would "stick' closed and not return to it's rest postion of about 15 percent. After cleaning, the sticking closed did not happen. I'd guess that during the start process the throttle motor closes the throttle plate and it sticks, inhibiting the throttle motor from opening the throttle plate at the rate needed to get the AFR mixture (i.e. air past throttle plate) correct for startup and idle. Even if my speculation here is wrong, I am sure that cleaning the plate fixed this problem. Thanks for the information on this forum folks! :th_thumb-up:
 
04CompG said:
God it was basically completely black inside. I can't believe how ditry it was.
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I know what you mean:

http://img.photobucket.com/albums/v317/sabrewings/random stuff 2/DSC02405.jpg

I was able to get it this clean prior to returning it to ZZP for a core (didn't want my core charge to get dinged for being too dirty):

http://img.photobucket.com/albums/v317/sabrewings/random stuff 2/DSC02440.jpg

That was with careful use of carb cleaner. I didn't try too hard since it's just a core, but I felt it could've been better. What Chemtool B-12 did you use? Air Intake Cleaner?
 
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