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Re: Throttle position sensor on 1998 2.5 v6 Auto Petrol
Posted: Tue Jun 10, 2025 2:14 pm
by tomatoto
I did check mine today, and this little valve is actually the idle screw.
Mine was also filled with soot, so I cleaned it. I didn't have the opportunity to check if my problem was gone, I'll do it ASAP. I hope it will, though, I really don't know how it could, as it's just an idle valve
so if I still have the problem, I'll clean the Throttle Body too
Re: Throttle position sensor on 1998 2.5 v6 Auto Petrol
Posted: Tue Jun 10, 2025 2:24 pm
by g8dhe
The TPS is a potentiometer which feeds back to the ECU the the throttle position see 18-9101;
https://www.lushprojects.com/bongoparts ... no=.html#5
There is a separate Air Adjusting Screw but accessed from the drivers side as I recall at the back of the engine.
Re: Throttle position sensor on 1998 2.5 v6 Auto Petrol
Posted: Tue Jun 10, 2025 2:26 pm
by tomatoto
Yes, thanks, I know them, but I don't understand why you're posting this now.
As I'm experiencing EXACTLY the same problem as sp2cpss , I expect the solution will be the same too
Re: Throttle position sensor on 1998 2.5 v6 Auto Petrol
Posted: Tue Jun 10, 2025 2:30 pm
by g8dhe
Ah its come up on a new page, I didn't read back just read the title and saw you referring to a valve!
Re: Throttle position sensor on 1998 2.5 v6 Auto Petrol
Posted: Tue Jun 10, 2025 2:32 pm
by tomatoto
ahah, I get it, my bad, I posted a second message so you missed the first one
Re: Throttle position sensor on 1998 2.5 v6 Auto Petrol
Posted: Mon Jun 16, 2025 11:01 am
by tomatoto
So, I cleaned this valve, which is an idle adjustment screw,
I cleaned the Throttle Body, even if it wasn't any dirty.
I also replaced the 6 sparking plugs.
And there's no change at all. Exactly as before. Same problems and same fault codes.
I will, as I planned in the first place, replace the MAF sensor, as I think it may be a good culprit.
I would replace or at least remove check and clean the TPS too.
And I'll see what happen next.
When I replaced the sparking plugs, there was one that was noticeably darker than the 5 others. So I suspect this too for the lack of power, but I don't see how it could affect the high fuel consumption. The wire looks ok. But I may check the distributor too and see what's inside.
Re: Throttle position sensor on 1998 2.5 v6 Auto Petrol
Posted: Sun Jul 27, 2025 10:44 pm
by gaffer1011
Hi,
Did you manage to solve your issue? Im having the same symptoms on my 2litre petrol.
Any advice is much appreciated!
I have done a ATF change, checked cleaned contacts on TPS sensor but no joy. Seems ok for the first couple of mins but then the over revving between 2nd/3rd starts and it feels like its using more juice than normal.