V8 TB on VN V6 no go.

[Bz Kn33z]

Hello i have a V6 S1 VN and i put a V8 TB on it and the engine like comes on i checked the codes and it gave me code 22 or 23 the TPS i tryied adjusting it at the base still nothing changed computers nothing put it onto different VNs and changed sensors on the TB its self and got a new TPS STILL NO GO.....

The Throttle body came off a VP V8 and its a S2 VP could there be something different from the S1 to S2 VPs or something cause i thought it was an easy swap any info would be great thanx.

[greenfoam]

Maybe you are putting the TPS sensors in wrong, I think you can line them up wrong if you try hard enough, you would have to say that one of them is working

[Bz Kn33z]

Dont think i am putting it on wrong cause it only wants to go on 1 way and i change it over the the V6 1 and its fine. i'm stumped.

[immortality]

it should have been a direct swap. buggered TPS i'd say. i have a V8 TB on a S1 V6 and i didn't have any problems fitting it

[Cheap6]

We've been through this before:

TB TPS Problems HELP!

What are the voltages you are getting out of the TPS with the throttle closed and wide open. If you are unclear as to how to check the voltage, post back and one of us will explain further.

(I hope you realised that you don't have to bolt on the TB's to check the sensor voltage, only plug in the connector. In fact, it doesn't even have to be on the TB; you can turn it with a screwdriver).

[Bz Kn33z]

Thanx sorry didnt know people wrote in the old tread, had alot of stuffing around with it getting sick of playing with the thing nothing seems to work need some1 to look at it or something cause whatever i do doesnt seem to work

[Cheap6]

It will be solveable, if you want to try.

Where are you up to atm ie. what have you tried so far?

[Bz Kn33z]

Tried to position the TPS check voltage on wires checked codes it coughs and carrys on like a sick granny put a brand new TPS in but it doesnt carry on with the V6 one.

[Cheap6]

So, is this correct?

With the (original) V6 TB and TPS it's OK.

With the V8 TB and TPS it's not OK.

With the V8 TB and new TPS it's not OK?

[greenfoam]

That's what it sounds like?! broken wire near the plug? plug? theres a plug he says? hehe

[Bz Kn33z]

Tried the V8 TB on 2 cars both VN S1, yes it is correct and what is the odds of it happening in 2 different cars?

[immortality]

so why not try the V6 TPS on the V8 TB

[Just_a_stocker]

The TPS is dicky, I got one from the wreckers and it was just as bad as the one I had.
worked ok when I got a new one.

[Bz Kn33z]

The TPS is brand new and it was on the V6 i have 2 and they are both finebut both dont work on the V8 TB.

[greenfoam]

I still dont think you are putting them in right

[Bz Kn33z]

can you tell me how to then lol.

[immortality]

their is a difference between early and later model TB's, the early ones have a thicker shaft and just turn in a bush inside the TB body, somewhere along the line they fitted needle roller bearings instead and had to run a thinner shaft. so that they can still use the original TPS (which was suited to the thicker shaft) they made a little adaptor that fits between the shaft and TPS. maybe this piece is missing from the V8 TB.

something to check anyway.

[Cheap6]

their is a difference between early and later model TB's, the early ones have a thicker shaft and just turn in a bush inside the TB body, somewhere along the line they fitted needle roller bearings instead and had to run a thinner shaft. so that they can still use the original TPS (which was suited to the thicker shaft) they made a little adaptor that fits between the shaft and TPS. maybe this piece is missing from the V8 TB.

something to check anyway.

That is the piece to which I was referring, and posted the part # for, in my last post in the earlier thread.

The give away would be a TPS signal voltage or resistance across the signal and earth terminals that doesn't change when the throttle is opened.

To check off the car:

Set a multimeter to Ohms = upside down 'U' (Greek Omega) 20K (=20 000 Ohms). Black lead to common, red lead to volts/ohms.

Looking at the TPS (not car) terminals, with the TB as it is in the car ie. TPS down, cable attachment up, the terminals are arranged in an 'A' layout.

Check the resistance between the top most and right most terminals.

With the TPS off the throttle body (the TPS may be rotated when it's fitted to the TB and read a bit less) it will read ~6.7K ohms (6700 ohms). If the throttle plate is opened (TPS on TB) or the centre of the TPS rotated using a screwdriver, the resistance reading will reduce gradually, to ~1.3K ohms at full rotation. If it doesn't do so with the TPS installed on the V8 TB, the drive piece is probably missing.