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Old 12-18-2013, 03:54 PM   #1
JavaBot
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99rs Slvr City Buggy
'14 swp 5dr sport

Default TB Woes

So I swapped motors from a bad fuel pump that did some nice damage... had two vendors working on it, but now the car runs but idles like crap. It was heaving slightly and bouncy but not jumpy. At open loop we get full compression and motor fires strong but runs a little wacky. Idle heaves so I replaced stock intake, front o2 sensor, and brand new maf sensor. It was dipping too low and almost stalling so we raised the idle from .5 to .75.

Main issue is now after warming up it is hesitant to drop back down to idle after prolonged open loop or heavy clutching. I have replaced maf sensor, the full stock intake, upstream 02 sensor, IAT sensor, and fuel pump/filter.

I think the throttle body is getting stuck open after highway driving... I know it's hard to diag online, but if I replace TB does this sound like it will get rid of the problem or do you think there is a clog in the system somewhere else.

Any info helps!! Thx
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Old 12-24-2013, 03:43 PM   #2
scarney1988
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Hmm Why not perform a thorough throttle body cleaning service. 3M, Seafoam, etc... branded throttle body cleaners both clean and LUBRICATE. I would recommend getting a can cleaner and a tooth brush and some rags. Go to town. If you pull the TB than get a new TB gasket.

Just an idea.
Good luck.
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Old 12-25-2013, 03:54 PM   #3
JavaBot
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Thanks yea I made it down to dc from Philly yesterday but each toll and stoplight around here was idling extremely high. If I stopped around 1.5k it would raise up to around 3k and then drop to about 2k if I don't engage the motor/trans.

Engine temps are normal fires fine but it's like the throttle gets stuck open after warming up. Does this seem like somethig that can happen or am I anticipating a more ecu driven problem?

Instead of cleaning tb like we did with iac, I was thinking of replacing the whole thing since its around $80 on amazon.

Thx for the suggestion it's an odd problem for sure.
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Old 12-25-2013, 06:07 PM   #4
maxima99matt
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Default tb

My throttle body has stuck wide open had to run over and turn off key. Could this be from dirt wedging plate open?
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Old 12-26-2013, 03:47 PM   #5
JavaBot
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YES thank god that's good insight I will check the dw plate asap, where is it located on the tb and did you clean it to reset to normal? Or should I just purchase a new tb, at this point when something fails I try to replace with new so car gets to where it's supposed to be. I'm not even sure which throttle body is on there since there was a carrousel of motors we were picking and choosing from with some 'vendors' on here.

We cleaned the iac but not tb when motor was out one of those times...
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Old 12-26-2013, 06:53 PM   #6
scarney1988
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Where in philadelphia are you located? I work in both Delco and Montgo at different automtive shops. Maybe a second set of eyes would help.
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Old 12-26-2013, 09:42 PM   #7
JavaBot
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South philly and I'd love a second set of eyes. I can't even explain what I've been through to get to this point so any help is much appreciated. Are you in sj? I'm back to philly on sun and off the rest of the week till the thurs the 2nd. I think early in the week I will finally be finishing the suspension I started before the "motor" took a ****.
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Old 12-26-2013, 09:47 PM   #8
JavaBot
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I have personally narrowed it down to tb from my thoughts/experiences and I'd love for someone who's done it before to clean the tb if you think that will help, otherwise I am looking to replace with new if I can. If it isn't tb i may have a clog in the lines or maybe its an ecu thing.

iirc we swapped mani's so I may have a bunch of old parts on the newer motor but it's far from 'reliable' with literally zero power mods other than uel headers and borla exhaust
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Old 12-27-2013, 10:15 PM   #9
fastnoypi
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2 ways to clean the tb, on the car..just requires you to pull you inlet pipe off, pull back on your throttle cable and stuff a small towel under the throttle plate( to catch dirt and puddling cleaner), and spray around the outer edges with carb cleaner/throttle body cleaner. Actuate the throttle plate by hand back and forth to make sure you dont have any little sludge hanging up the plate.

Or off the car, get a new tb gasket ready.. pull off all the sensors, and unbolt the tb. reinstall in reverse order.

before you do anything, relieve any tension on the tb caused the a cruise control cable if you have cruise control. Also make sure your tb cable isnt kinked or routed under anything that would cause it to have extra tension... it might be the cause for your tb to hang open. If the cable housing has been bent/frayed, just get a new cable.

if it was ecu related, id check out the tb position sensor on a multimeter to read incrementally smooth between 0-5v and clean the connector if it reads good.

if you run out of resources, you're welcome to come down
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Old 12-27-2013, 11:35 PM   #10
scarney1988
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Im currently working in montgomeryville,pa but I go down to eddystone,pa every thursday. PM me if you would like to arrange something.
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Old 12-28-2013, 08:55 PM   #11
JavaBot
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'14 swp 5dr sport

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Awesome thank you gents.

Fast where are you located? I know I could do it I just fear borking before trip or getting stuck halfway. Also unfortunately have no tools w me or gaskets handy.

scarney I'll pm you, how far is eddystone pa from phila?
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Old 12-30-2013, 04:29 AM   #12
LoLoHax
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This sounds silly, but do you have cruise control? And if so, how tight is the cable?

I have personally had this issue in the past (exactly as you have described - high idle after hard driving) to the point where I had to physically remove the cruise control cable from its slot on the TB or risk overheating. I narrowed it down to the mount flexing ever so slightly as the hot engine caused expansion.

To solve the problem, I simply loosened the cable attached to the throttle body and it completely fixed my idle issue. This was after cleaning everything with seafoam, new air filter, ECU reset, grounding checks, etc. Just food for thought. Good luck.
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Old 12-30-2013, 10:40 AM   #13
JavaBot
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99rs Slvr City Buggy
'14 swp 5dr sport

Default

Awesome, no cc though, slot is empty.

We did adjust the idle to have the heaving not near cutout... raised it from .5 to about .75, so maybe it is too tight although I almost feel a little slack. Got a hot date with Andrewtech in MD right now actually so I'll ask them if loosening the cable might help. I'd be more in tune to say the tb actuator needs a good lube due to heat expansion as you mentioned. I'm going to give your thoughts to them too though so thank you! Will know more in a few hours after a fresh tb clense.

crazy thing is compression is good and temps are normal just having a winding idle worries me esp in traffic situations.
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