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#1
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So I did the TPS adjustment the other week...
and I think the TPS may be bad. Had ben reading the thread by Chike and Tom on adjusting the TPS to read 0.50 volts at idle with all the accessories turned off. I had been having a problem with my SVX, ever since I've had it, with high idle speeds. It always idled between 1300 and 2500 rpm. I removed the TPS and cleaned it with carb cleaner, working it back and forth to clean the contacts and innerds, and reinstalled it. It made some improvement in response but none in idle speed. I then connected my digital voltmeter as instructed by Tom (svxfiles) and adjusted the TPS to read 0.50 volts at idle. Checked my RPMs and the thing is idling at 1800rpm. I drove it a bit to see if it would settle but it didn't. It did run great though. Finally fed up with the high idle, I simply turned down the TPS untill it idled as low as I can get it to idle which is only 1100 rpm. Now it has a nasty hesitation just off idle and the engine seems to have no power until the revs hit a point then it jumps like a race horse out of it's gate. Makes it real tough to drive it smoothly. I hate the thought of adjusting it back to .50 volts because I just can't take the damed racing of the engine at every stop loght or traffic jam. Any helpful suggestions out there?
The TPS on this SVX is different than on my original SVX. It is a tan color and much thicker and clunkier looking. Almost as if it came from an Impreza or Legacy. Can any Subaru model TPS sensor be used on the SVX or must it be a specific part#? As I understand it there is no way to adjust the idle since it is controlled by the ECU and data from the TPS sensor mainly. Johnny
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape. |
#2
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Try cleaning it with electrical contact cleaner (available at Radio Shack)- use the straw that comes with it so you can spray it right in the small hole on the underside of the TPS. The carb cleaner isn't going to do the job. I'm not sure if the TPSes are interchangeable - you might want to see about getting a TPS off of a junk yard motor and seeing what happens - .5VDC is the magical number!
-Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#3
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Have you checked the IAC, etc? I would hate for you to buy a new TPS (expensive little buggers) just to find it didn't fix the problem. If it can be adjusted to 0.5V - AND - it's idling high, then it's not likely to be the TPS. As I understand it, TPS errors occur as you move through the throttle range and encounter bad resistive sections, thus fooling the ECU into thinking the throttle position is somewhere it isn't.
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#4
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You could try grounding the "neutral" position pin on the ECU. I had occasionally problems with high idle before I grounded the neutral pin. No problems now.
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads. |
#6
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I have a spare TPS from the motor I bought from Todd. PM me your mailing address and it's yours. I have never tested it or anything but have no reason to think that it would be bad. The motor had around 100k on it.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#7
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Quote:
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape. |
#8
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Quote:
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape. |
#9
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IAC= idle air control valve. not sure of its location...but someone else can tell you.
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Matt 15 OBW premium w/eyesight A picture of an SVX in the garage |
#10
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There's a thread on here where someone cleaned the IAC. I'll see if I can dig it up.
http://www.subaru-svx.net/forum/show...ight=IAC+clean
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#11
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Quote:
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape. |
#12
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Quote:
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape. |
#13
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Quote:
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape. |
#14
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Hi Johnny,
It can take a while for the idle to settle after TPS replacement, and if you need, I have another. Maybe I can install it for you at Hagerstown on the 25th? IU'll bring the Subaru Select Moniter!!!
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#15
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Tom creates a new word....
Quote:
-Bill
__________________
Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
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