Getting frustrated, tried to check TPS and broke a vacume line.

Well, first I don't even think I have found the TPS, I found a black module facing the firewall on the back of the throttle body and I even found a wire with a green strip, but it says the voltage is 1.9mV and changes to 2.0 at WOT. I didn't find the two adjusting screws, the only two screws that I found hold the module to the throttle body.

And in the process I broke a vacume line!!!!
This car is starting to become a PITA!!!

Does anyone have a detailed picture of the TPS??? and the IAC.

sorry for venting,
david

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Looking for the 5.0, airplane, SVO, and GIRL of my dreams!!!
Wings are for planes!!! (I would know I fly them!)

Here is a shot of the backside of the throttle body with the TPS mounted under the idle air control valve (IAC) (the cylinder like thing) There is also a TPS laying loose below the TB, in the relative position that it would mount on the TB. The TPS is held on by two phillips screws. With a short screw driver you can get to both screws from the driver's side. It may be easier to take the idle air valve off. It's held on by two bolts, one of which is visible in the photo. The other one is directly above it on top, just doesn't show in the picture. It's a touch feely job as you can't see the TPS unleass you take the IAC off.

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NATO Member. it's not a vice, it's an obsession
"The nice thing about each new day is nobody ever used it before" Barnaby Jones
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm

Ok, well that was what I tested and it said like 1.9mV, does this mean that my TPS is bad, note that I checked the TPS with the engine off.

So how do I adjust the TPS, where are the screws to adjust the TPS at??

later,
david

David:

There are two screws...one on each side of the TPS (One Driver's side One Pass side).

Loosen them and then twist the TPS until the voltage is around .96V to .98V when throttle is closed. Then tighten them. Voltage should rise smmothly to around 4.0V at Wide Open Throttle.

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Dan Eaves
88TC 5spd, Crower 5.5" Sportsman Rods, Short Wiseco Pistons bored .030" Over, Ported Head with Polished Combustion Chambers, Gutted & Polished Upper, Ported & Polished Lower, Polished T/B, Ported E6, SVO T3 .63AR Turbo, Bosch Bypass Valve, 3" DP w/No Cat, 2 1/2" DynoMax single cat back w/DynoMax Super Turbo Muffler, RR Cam, K&N in Fenderwell, Gillis Boost Valve, Centerforce I Clutch, Removed A/C, Polished Wheels, Polished Valve Cover, Polished Crank and W/P Pulleys, Walbro 255LPH HP Pump, Kirban Adj FPR, and the DAMN Heater Core is new too !

http://www.geocities.com/wot_turbo/WOT.html

NATO MEMBER (Vice Chairman...if it's a vice...I deal with it)

The two phillips screws you see in the picture are what get loosened - just SLIGHTLY. The screw holes are really curved slots. This will allow the TPS to be rotated

I'm assuming you have read the article on "Idle/TPS Adjustment" in the Technical Articles. Disconnect the harness to the IAC Once you have the idle set to about 750, then you want the TPS voltage to be 0.9+ volts (not mV) I shoot for 0.93-0.94V.

You check the voltage by back probing the green and black wires. Back probing means sticking pins into the connector until they contact metal inside the connectors. Don't stick through the insulation into the wires.

Connect the pins to your meter using leads and alligator clips. It can take a few tries to get the pis into the connector so they make contact and pick up voltage

Get the initial voltage set by rotating the TPS, then tightening one of the screws enough to hold it. (see the article) Now check/reset the idle back to the speed in the article. When you get the base TPS voltage and th erpms both at the desired settings at the same time then tighten both screws to the TPS. The above you do with the engine running.

Now shut the engine off, turn the key on and check the voltage as you slowly open the throttle. The article will direct you from here.

Ok, I checked the TPS and it's right around .98 at idle, which seems fine to me. I still can't figure out why the car wants to cut off when it's cold. I'm going to clean the IAC and see if that helps.

thanks,
david