Thread: 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.

Originally Posted by WhiteGT

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.

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.

Originally Posted by Randy_W

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.

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.

my 04 gt does the same thing. i thought mine was the only one.

Originally Posted by Deezul_AwT

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.

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.

Originally Posted by skubasteve!

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

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.

got mine cleaned up. WOW what a diff. thx guys!

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!