umpqua123 07-25-2009, 03:54 PM A while ago, I took apart the throttle body and IAC on my 1997 3.4L T-100 4wd as was suggested for high idle that dropped only when revving the engine. It's been frustrating trying to get the idle to idle instead of staying at 15K when coasting in neutral or at a stop. I cleaned the MAF, throttle body and IAC, put on a new gasket at the throttle body and a new rubber gasket where the IAC joins the throttle body. I started the truck cold and it took 5 min to come to idle (800rpm). However, once I take it for a drive, the idle sticks at 13-15K when coming to a stop. I rev it and it drops to 800. Still no idle relief. Prior to putting everything back together, I hooked up the IAC to a 12v battery and got the roller to open some and close when disconnecting power. How much is it supposed to open with power applied...in other words when do I know if it's time to replace it? or can anyone think of another reason for the high idle?
BamZipPow 07-26-2009, 01:14 AM Try taking the motor off and rotating the IAC valve shaft with yer fingers. You shouldn't have to take the throttle body off to do this test. The electric motor is held on with 2 philips screws. :D
knj27 07-26-2009, 03:27 AM instead of staying at 15K...
Formula 1 motor in that thing? ;)
fourwd1 07-26-2009, 05:42 PM And now for a more helpful comment. have you looked at the TPS ?
umpqua123 07-27-2009, 09:32 AM Sorry about the typo....I meant idle sticks at 1500+ rpm
How will I know if the TPS is bad?
narksuwan 07-27-2009, 09:43 PM Sorry about the typo....I meant idle sticks at 1500+ rpm
How will I know if the TPS is bad?
I'm with ya. Seem like TPS is defective. IAC wouldn't behave like that after it's warmed up. Get a book and it'll tell you how to test it. You'll need test meter around $40 will do.
knj27 07-28-2009, 12:47 AM TPS is tested with a multi-meter, you'll need a service manual for the numbers of what it should spec out at.
umpqua123 07-28-2009, 02:05 AM I'll try to find a service book (library maybe?) or is there anybody out there with a book that is able to tell me the multimeter test specs for the leads on the TPS....?
knj27 07-28-2009, 02:29 AM You can often find shop manuals at the library, not sure if TPS specs would be in there or if you need a FSM.
fourwd1 07-28-2009, 10:58 AM Throttle fully closed - VTA to E2 = 0.2 - 5.7K ohms
Throttle fully open - VTA to E2 = 2.0 - 10.2K ohms
----------------------- VC to E2 = 2.5 - 5.9K ohms
E2 is the top termainal of the TPS connector
VC is the middle terminal
VTA is the bottom terminal
narksuwan 07-28-2009, 11:47 AM Gee wheeze, it only cost $20. You'll spend more than that on gas and beside it has more important info in there like "how to change motor oil".:lol:
BamZipPow 07-28-2009, 01:31 PM I would still pull the electrical motor on the IAC and physically rotate that valve shaft while spraying some cleaner through the port. It's highly unlikely the electrical motor has gone bad...it's yer call... :D
TPS...
http://www.toyodiy.com/parts/p_U_1998_TOYOTA_T100_VCK11L-CRSSKA_8404.html?hl=89452
From ToyotaPartSales.com...
Item Number MSRP Core Price Price
8945235020 $59.56 $0.00 $46.55
Electrical - Powertrain control - Throttle position sensor
Throttle position sensor, t100, 6 cylinder 1997 - 1998
IAC...
http://www.toyodiy.com/parts/p_U_1998_TOYOTA_T100_VCK11L-CRSSKA_2211.5.html?hl=22270
From ToyotaPartSales.com
Item Number MSRP Core Price Price
2227062050 $248.47 $0.00 $194.19
Fuel system - Fuel induction - Fuel injection - Idle speed control
Idle speed control, t100, 6 cylinder 1997 - 1998
Factory service manual on eBay...fer about $105 shipped...
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=310111059987
...or about $90 shipped...
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=390050524944
Electrical wiring diagram...fer about $30 shipped...
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=390048399744
narksuwan 07-28-2009, 05:27 PM I would still pull the electrical motor on the IAC and physically rotate that valve shaft while spraying some cleaner through the port. It's highly unlikely the electrical motor has gone bad...it's yer call... :D
TPS...
http://www.toyodiy.com/parts/p_U_1998_TOYOTA_T100_VCK11L-CRSSKA_8404.html?hl=89452
From ToyotaPartSales.com...
Item Number MSRP Core Price Price
8945235020 $59.56 $0.00 $46.55
Electrical - Powertrain control - Throttle position sensor
Throttle position sensor, t100, 6 cylinder 1997 - 1998
IAC...
http://www.toyodiy.com/parts/p_U_1998_TOYOTA_T100_VCK11L-CRSSKA_2211.5.html?hl=22270
From ToyotaPartSales.com
Item Number MSRP Core Price Price
2227062050 $248.47 $0.00 $194.19
Fuel system - Fuel induction - Fuel injection - Idle speed control
Idle speed control, t100, 6 cylinder 1997 - 1998
Factory service manual on eBay...fer about $105 shipped...
http://rover.ebay.com/ar/1/711-53200-19255-0/1?mpt=291795644&adtype=1&size=1x1&type=3&campid=5336116672&toolid=10001 http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=310111059987 (http://rover.ebay.com/rover/1/711-53200-19255-0/1?type=3&campid=5336116672&toolid=10001&mpre=http%3A%2F%2Fcgi.ebay.com%2Febaymotors%2Fws%2 FeBayISAPI.dll%3FViewItem%26item%3D310111059987)
...or about $90 shipped...
http://rover.ebay.com/ar/1/711-53200-19255-0/1?mpt=1801571120&adtype=1&size=1x1&type=3&campid=5336116672&toolid=10001 http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=390050524944 (http://rover.ebay.com/rover/1/711-53200-19255-0/1?type=3&campid=5336116672&toolid=10001&mpre=http%3A%2F%2Fcgi.ebay.com%2Febaymotors%2Fws%2 FeBayISAPI.dll%3FViewItem%26item%3D390050524944)
Electrical wiring diagram...fer about $30 shipped...
http://rover.ebay.com/ar/1/711-53200-19255-0/1?mpt=454986173&adtype=1&size=1x1&type=3&campid=5336116672&toolid=10001 http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=390048399744 (http://rover.ebay.com/rover/1/711-53200-19255-0/1?type=3&campid=5336116672&toolid=10001&mpre=http%3A%2F%2Fcgi.ebay.com%2Febaymotors%2Fws%2 FeBayISAPI.dll%3FViewItem%26item%3D390048399744)
Autozone has the knock-off service manual for $20
knj27 07-29-2009, 01:25 AM Throttle fully closed - VTA to E2 = 0.2 - 5.7K ohms
Throttle fully open - VTA to E2 = 2.0 - 10.2K ohms
----------------------- VC to E2 = 2.5 - 5.9K ohms
E2 is the top termainal of the TPS connector
VC is the middle terminal
VTA is the bottom terminal
You knew that off the top of your head for a 5vze or what?
umpqua123 07-29-2009, 08:45 AM Great info folks, thanks a lot for all the input.
Forgive me if this seems like a dumb question...
Throttle open- I take that to mean manually opening the throttle where the cable connects to the throttle body with the engine off?
knj27 07-29-2009, 05:26 PM ^yep...
fourwd1 07-29-2009, 08:20 PM You knew that off the top of your head for a 5vze or what?
I'm like the TV ad for Avanced Business Systems.
knj27 07-29-2009, 09:36 PM nice
umpqua123 08-22-2009, 11:50 PM Ok, long hiatus...back home again.
Finally checked the TPS and got no ohm readings on any of the leads. Hopefully I did it right. Disconnected the wire harness and tested the exposed leads on the TPS. Nothing. Went to Carquest and paid $47 for a new TPS, installed it and started engine. It settled to a nice 800 idle. Took it for a spin and the idle kept sticking at 1300-1500 when coasting or in between gears when shifting. Do I need to disconnect battery to reset computer? Any ideas/suggestions?
BamZipPow 08-23-2009, 04:03 PM Maybe yer TB is worn out? I remember someone having a problem where the throttle plate shaft was worn and allowing extra air to seep in causing a high idle...you'll probably have to do a search here or at www.4x4wire.com on their forums... ;)
How many miles?
umpqua123 08-24-2009, 12:42 AM This T100 has 185K miles on it. Someone else said it might be the sleeve that the throttle pin is housed within might need to be rebuilt/replaced as the pin might be sticking. I thought not and kept looking for other solutions.
How does tapping the accelerator get the idle to drop when in neutral (at a stop or while between gears shifting)?
BamZipPow 08-24-2009, 01:57 AM I'd say take the TB back off and give it another go at cleaning...you could even cycle the TB and see if it feels like it's sticking... ;)
umpqua123 08-24-2009, 02:46 AM This will be the 4th time I'll be taking the TB off and cleaning it. I have used a toothbrush and TB cleaner spray. Had some black crud flow out 1st time. Plate seems to slam shut tight with the spring tension. I've taken off the IAC and sprayed and brushed that too. Disconnected the solenoid under it and cleaned it out too. Ran 12v to it and saw that it still turned the shaft open and closed.
I'm pretty frustrated at my lack of success finding the culprit. Am I cleaning these parts improperly? Not looking forward to buying a new IAC or TB...
BamZipPow 08-24-2009, 03:41 AM Hmm...are you sure the throttle cable isn't sticking? Just a thought... ;)
BamZipPow 08-24-2009, 03:50 AM Just in case it is the throttle cable... ;)
ToyoDIY (http://www.toyodiy.com/parts/p_U_1998_TOYOTA_T100_VCK11L-CRSSKA_3513.4.html?hl=35520) diagram fer the throttle cable...part number 35520-35190
From ToyotaPartSales.com
Item Number MSRP Core Price Price
3552035190 $86.68 $0.00 $67.74
CABLE ASSY, THROTTLE
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