Didn't want to post in the all motor forum for this one (mods move the thread if you think its better off in there please). So for a while now I've noticed that my throttle has been acting up.

Symptoms:
- hesitation on the low end
- when i release the throttle my rpms drop dramatically back down to 1.5 or so. When I open the throttle it seems to open back up but not pull at all till 2.5-3 rpms.

I do have an 00vi but it has never acted like this before, but that is info that needs to be taken into consideration because of the difference in tb's and all.

Possibilities:
- low tranny fluid. Had a leak, fixed leak, may not be enough fluid in still after adding some
- blown maf? I know a blown maf can cause rpm fluctuations but not sure
- bad tb setting?
- tps needs readjustment?

I have a CEL which I will diagnose tomorrow but I believe it to be the EVAP system anyways. I'm thinking it may just be little adjustments but I wanted to see if people thought it could be a maf issue. Also read through stuff on here and in my manual hoping to find the issue but nothing explaining my symptoms. Will continue to search and test but in the mean time I wanted to post to get opinions on the issue. If you don't know about this stuff don't post please. I've seen too many posts lately from guys that don't know what they are talking about. Thanks for the help.

 

TPS gets my vote, scan codes, and grab a multimeter and check the settings on that biotch.

 

You know what to do, check for codes, MAF and TPS.

 

yeah i'm going to adjust everything. No time to get the codes done today. See what happens.

 

vac leak?

 

yea just worked on the car and adjusted some stuff. Noticed that there is a leak but I can not seem to find it. Tranny fluid was low too so we'll see if that helps. I'll check some more stuff later.

 

Also, clean the TB. You wouldn't believe how much that helped. I think with the 00VI the TB gets more dirty than the USIM. My car would stall every time I brake. After I cleaned it the rpms wouldn't drop excessively causing the car to stall.

 

A vac leak would not cause those symptoms.

I vote TPS. Coincidentally, Ive got one if you need it.

I doubt its MAF.

 

ok well I adjusted some stuff and the car is running better now. Not as much as a drop on the rpms. Never been able to get the tps perfectly set tho which has caused part of the problems. But the car is running better. Fine for now. When I add the 5th gen intake assembly I'll be redoing the hoses and hopefully fix vac leaks. We'll see how things go from here. Thanks for the thoughts.

 

When setting the TPS, did you look through the groove at the sensor plate and the throttle pin?

 

what? I've set the tps numerous times but it just never is set perfect.

 

You are running 4th or 5th gen TB? And TPS?

Not sure if there is a difference, but what I am trying to say is this:

There is a circular pit where the TPS goes in. In that pit is the throttle plate rod, the thing that the springs are on, the thing that the throttle plate is screwed into, and the thing in our case for the TPS, it has a small pin in a perpendicular to the rod. Now, when positioning the TPS, on it you will see a small metal piece with a small L shaped bend on one end. This L shaped bend is what, when set, should just touch, but not be moved, by the small pin on the TB. When putting the TPS on, there is a small slit for viewing your work, to see when the TB pin and TPS plate match up.

Hope that helps.

 

yes i know how to set a tps. I have a PF tb on my car which makes the setting of the tps a little different but yeah even set at the correct setting things need adjustment. When set correctly my tranny doesn't shift right and the idle is very high on my car. It's good where it is now anyway.

 

Alright, just trying to help. If you want to try a new TPS Ive got one.

Have you checked for vac leaks?

 

yea i appreciate the thoughts. Well I had two different tps's before and I don't think it made a difference. Not sure tho. Vac leaks will be checked soon. There is one I knew, another I can't seem to find. We'll see haha

 

I once had a shop use a smoke machine to test for leaks. Its great, shows you exactly where it is and how big.

 

nice idea. Maybe I'll pull an idea like that. Where did you get that done? Any shop?

 

Where is your IAT? If it;'s just dangling down near the tranny/wheel well, that may be the problem. I know, I'm an FSM guru myself, but every time I have experienced those same symptoms, I found my IAT was not where it should have been (near filter). I always finding that it was dangling down near the tranny area.

And once I move it back to it’s home, it runs just fine. This has happened more than once, so

 

You bring up a good point. Something I need to check.

 

IAT is still in the same spot. Connected to that spot of tubbing connected to the bottom of the airbox. I never took out that part of the airbox, just have my filter on top of it so the air from the hood scoop still kinda came through up to the filter. Still think thats an issue?

 

Nope, probably not. I say that just because it hasn't moved, yet the symptoms appeared regardless of its location.

 

ok. well i might put the IAT into the 5th gen box setup when I do that. Maybe that will help.

 

Ok this is old but I'm bumping it since my symptoms have not changed. Car still feels awkward. Any time when I let off the gas the car wants to drop back to 1-1.5 rpms. I also forget to point out before that the car sorta pops when I step back on the gas. It'll drop to 1.5 or so then when I step back on the gas the tranny seems to jerk into gear. Is it because of a bad tps setting? Would that be the cause? Also what are symptoms of a dying maf? I can't find any decent info searching for this. Not sure why.

 

it pop's? it sounds like a vac leak after the MAF, it will cause similar driveability issues, and what exactly is your TPS issue? not getting WOT etc... ? like the earlier post said sai, use smoke, i did it on my own though. rolled up a shop towel really tight dip the tip in whatever flamable solution, let it flame up for a minute then blow it out and hold then end around the intake, it will smoke for about a minute, long enough to find your leak, make sure your fans arent either...lol

 

yeah pops. Just feels as tho the gears are recatching when I step on the gas. Like a distinctive jerk. I believe there is a leak behind my tb/iacv block. I don't have the ability to seal it now since I use the car everyday constantly. I will seal that very soon and maybe it will fix the problem. I don't really want to smoke my engine tho.

 

what did the CEL code show?