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Carb (TPS) question...

HammerDown

Well-known member
Joined
Jan 23, 2003
Messages
474
Location
Glenolden Pa
Corvette
1981 White/ Red int.
A (tps) code came up for my check engine light along with a sometimes stumble from a dead stop.
I know 4150 holley's like the back of my hand...But never ventured into the Computer controled Q-Jet.
Any "Drama" involved changing out the TPS ? The cars a 81.
Thanks for any suggestions/tips.
 
Not a whole lot of drama involved, just takes some patience. You will need to take the top of the carb off first. To do that you need to remove all of the cover screws, don't forget the two underneath the top choke butterfly. You will need to remove the little tab on the end of the choke butterfly to get the choke linkage rod disconnected. You will also need to remove the little canister that holds the secondaries closed until vacuum drops off so that you can get that linkage rod off. Then take a tiny punch and drive the roll pin that holds the accerlerator pump rod on towards the center of the carb, but don't drive it tight up against the center where the air cleaner sits. If you leave a little gap in there it makes it easy to get a thin scraper in there to put the pin back in later. Just drive it out until you can get the pump arm off. Then disconnect the M/C selenoid wire and the top should be ready to lift off. You have to go slow so that you get the choke linkage out of it's slot and watch the gasket so you don't tear it. Once the top is off the TPS just drops right in there. That part is pretty self explanatory. Once it's in there be careful putting the top back on since the TPS plunger sticks out at an angle and it is pretty easy to break the TPS putting the top back on. Oh yeah, when the top is off don't play with the rich or lean stop screws for you M/C selenoid, that'll save you having to redo that setup. Once it's back together you will need to make a jumper wire that allows you to get in between the TPS connector and the TPS plug from the harness. You need to be able to connect to the TPS with the factory plug, but still measure voltage between B and C on the connector. Take the adjustment plug out that is in the back of the accerlerator pump mounting area and with your multimeter connected and the engine and ignition off and throttle closed adjust the screw until your meter reads .48 volts. Your new TPS will have an instruction sheet with it that says this too, as well as detailed instructions on the easy way to get the plug out. Feel free to email me or post here and I'll check back if you have any more questions.


-Justin
 
Perfect:cool just what I was looking for. I'll be at this very soon.

Thanks...Ray
 
Of course, adjusting the TPS position (and subsequent voltage) will be a lot easier (i.e., "possible") if you have the proper adjustment tool. I like the OTC set, P/N 7667, about $20.
 
That's a good point. You can also get all of the weatherpack connectors and pins and seals to make up a harness that will plug right in between the TPS and the harness connector from a John Deere farm equipment dealer. They have a whole assortment in the back so that you can pick out what you need. Make sure you carefully look at both the connector and the pins inside of it.


-Justin
 
Just wanted to say I finally got around to changing my TPS...thanks for the help. And no more "check engine light";)
PS. hooked up my friends Snap-On scanner and I dialed that puppy right in to I belive it was .54
 

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