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#1
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Throttle body
My advice to anyone with an SVX is to "Clean the throttle body!" what a difference, no surging, great idle,it actually seems to shift cleaner. I did not have the high Idle problem either. It actually appears to have dropped the idle a couple of hundred RPMs. The biggest difference is the low RPM range under load. much smoother. Took all of an hour and a half. There was an actual ridge of gunk behind the butterfly, all gone now. All I need is a fanbelt for the TR-8... it'll be 80 degrees here Tuesday
Collins 92 pearlie 80 TR-8 |
#2
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Re: Throttle body
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L
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Lwin M. Maung (Member # 147) Current SVX: • NONE Previous SVXes: •1994 LE Barcelona Red 107k • 1992 LS-L Pearl White 143k • 1994 LSi Bordeaux Pearl 220k • 1992 LS-L Ebony Pearl 184k • 1992 LS-L Liquid Silver 145k • 1992 LS-L Liquid Silver 102k • 1992 LS-L Ebony Pearl 123k Other current cars:•2001 Jeep Grand Cherokee Black If at first you don't succeed, CHEAT!
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#3
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My advice, for whatever thirty-three years of experience as a pro-wrench are worth, are to not only clean the throttle body but to also replace the PCV valve - it suffers from clogging also. First word of caution: do not undo anything that looks like an adjustment. The throttle blades have what some may consider to be an idle stop. The idle is controlled by the computer and IAC (idle air controller), not by the throttle stop. The stop is precisely adjusted at the factory to allow full closure without allowing the blades to contact the throttle bores.
The TPS (throttle position sensor) can be cleaned - kinda. It is not made to be disassembled and nobody should try to do so. However a squirt or two of carb cleaner followed by some air blowing or ample drying time can help remove some of the worn carbon inside and make its operation less electrically 'noisy'. To re-adjust it will require a volt-ohmmeter. Do a search here and you'll find several ways to accomplish the task. The crud that builds up inside the t-body occurs over a period of time. While the crud is building the throttle blades and IAC are being forced into different positions. The computer 'learns' how to make allowances for these new positions. As a result of cleaning the computer will need to relearn the new positions. Sometimes this can take a few days until everything falls back into place. Cleaning the t-body and MAF and replacing the PCV valve are common maladies to all modern port-injected engines. Some days it seems to be all I that I do. Customers come in with their MIL lamps glowing, I pull the codes - usually P03xx (misfires) and/or P040x (EGR malfunction of some sort) or P017x (O2 sensor malfunctions). A great deal of the time the misfires and O2 problems are caused or are related to crudded t-bodies and MAFs. BTW - pouring stuff in the gas tank absolutely won't help reduce these deposits. Don't waste your money if this is what you're trying to accomplish.
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) |
#4
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Cleaned the throttle body today with some synthetic valvoline stuff in a gray can. Used about half the can in there and tried to get it in as deep as I could to clean the intake runners too. Started the car and it was coughing and gargling like a big block cigarette boat with above water exhaust. It sounded so cool I took video of it. I think it was just burning off all the crud and spray in there and sounded like it was misfiring a little. Maybe I used too much. Ran it for a little while to clear up all the gunk and then it idled smooth. Time to go for a drive and see how she does. I love weekends with sunny skies and nothing to do.
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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. |
#5
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Quote:
- Rob |
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