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06-28-2012, 09:55 PM
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#1 |
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Registered User
Join Date: Mar 2011
Location: Cincinnati Ohio
Posts: 55
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454 Tbi sensor???
Ok so I had a crazy high idle when I got the truck. Found out a plug on the back of the throttle body was unplugged. Plugged it in idle dropped back down to normal. But it would kinda stumble every now and again at idle. It runs great otherwise Which sensor could be causing this?
Which sensors are which on the throttle body? Where's the map sensor? And what's the thing between the radiator and throttle body that has a little cilinder shaped filter in it? This is an 89 v3500 with 454 tbi and 4 speed Posted via Mobile Device |
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06-29-2012, 12:31 AM
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#2 |
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In the Forgotten far North.
 
Join Date: Jul 2007
Location: Anchorage, Alaska
Posts: 2,627
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Re: 454 Tbi sensor???
T.P.S. (THROTTLE POSITION SENSOR)
I.A.S.C. MOTOR (IDLE AIR SPEED CONTROL) And on toip at the back is the Fuel Pressure Regulator
__________________
1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade |
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06-29-2012, 01:45 AM
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#3 |
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Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: 454 Tbi sensor???
and do not forget MAP sensor and EGR solenoid mounted on the bracket
//RF
__________________
"The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29)  New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17) |
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06-29-2012, 06:48 AM
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#4 |
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Registered User
Join Date: Mar 2011
Location: Cincinnati Ohio
Posts: 55
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Re: 454 Tbi sensor???
Does anyone have a picture where they can point out each one. My factory service manual I got off eBay isnt here yet and I wanna get a jump start on this and see if I can fix the stumbling idle.
Also yesterday at startup it didn't like the fact it was a 100 degrees outside. It kept acting like a carb motor on a cold morning. I would assume this would be the map sensor after reading descriptions and symptoms of sensors online. Posted via Mobile Device |
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06-29-2012, 07:54 AM
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#5 |
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Registered User
Join Date: Mar 2011
Location: Cincinnati Ohio
Posts: 55
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Re: 454 Tbi sensor???
Ok I found the map sensor. It's plugged in but while searching for it I found another thing unplugged. Bare with me on the description. There is a 1 in diameter hose running from the air cleaner into it on the passenger side of the engine. The sensor is at the front of the engine on the passenger side near the belts of the truck. It has a second hose coming out of it I didn't trace where it goes. I did take a picture but can't upload them from my phone.
Also on the passenger side of the engine on the firewall was a sensor or some sort. Has plugs from the harness in the bottom of it and right next to it I found an empty spot and 3 plugs just dangling there. There is only enough length in those plugs to reach that empty spot and non of them would plug into each other as their all different shapes. I have a pic of it too but can't upload from my phone. Thanks again Larry Posted via Mobile Device |
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06-29-2012, 07:29 PM
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#6 |
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Registered User
Join Date: Mar 2011
Location: Cincinnati Ohio
Posts: 55
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Re: 454 Tbi sensor???
Anyone?
Posted via Mobile Device |
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06-29-2012, 08:01 PM
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#7 |
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Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: 454 Tbi sensor???
Post some photographs - it would easier.
//RF
__________________
"The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17) |
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