T series Throttle Body clean

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Paul_1978_yorks
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Joined: Mon Jan 22, 2007 11:11 pm
Car Ownership: Rover 216 Hatchback
Location: Wakefield, West Yorks

T series Throttle Body clean

#1 Post by Paul_1978_yorks » Wed Nov 01, 2017 8:18 pm

Has anyone got any guidance for cleaning the throttle body on the T-series?

Do I have to remove it from the car? It looks like there's a lot to disconnect, but maybe I only have to remove certain bits?

And as for cleaning it, what would you use? I've seen everything from using a toothbrush, to an old rag, to a spray can of carb and throttle body cleaner. I'm sure I've even read somewhere that someone washed it out with water and left it on the radiator all night :S .

Any help appreciated!
Current:
1996-N Nightfire 420 GSi Tourer
2005 Volvo V50 1.8 Sport
Former:
1994-M BRG 214 SEi
1995-N Silver 214 SEi
1995-N Nightfire Red 214 SEi
1995-M Silver 216 SLi
1993-K Caribbean Blue 216 Cabriolet
1990-G White 416 GSi
+ a 25, 45 & 75

Cromp85
Getting Settled In
Posts: 18
Joined: Fri Oct 02, 2015 11:24 am
Car Ownership: Rover 220 Nasp Hatchback
Location: Dudley

Re: T series Throttle Body clean

#2 Post by Cromp85 » Wed Nov 01, 2017 10:27 pm

Heres a quick guide from when i did mine:

Disconnect battery
Remove upper airbox and air feed to throttle
Disconnect all electrical plugs & vacum hoses from TB
Remove thottle cable and undo the 4 nuts that secure the TB to the rubber mounting on the back.

For the cleaning it i used petrol and a tooth brush.
You might want to remove the thottle pot and shift motor prior to cleaning as a precaution.

Hope this helps :)
My Rovers to date:
1994 Rover 220GSI in Tahiti blue (On the road)
2002 MG ZR 105 in Solar red (On loan)
1995 214i (On SORN)

Paul_1978_yorks
Club Member
Posts: 1427
Joined: Mon Jan 22, 2007 11:11 pm
Car Ownership: Rover 216 Hatchback
Location: Wakefield, West Yorks

Re: T series Throttle Body clean

#3 Post by Paul_1978_yorks » Thu Nov 02, 2017 7:54 am

That's great, many thanks. Is removing the battery to creat space or for another reason?

I'm slightly reluctant to disconnect the battery due to potentially activating the immobiliser as the documentation didn't include the key sequence :closedeyes

Finally, what's the throttle pot and shift motor? Many thanks!
Current:
1996-N Nightfire 420 GSi Tourer
2005 Volvo V50 1.8 Sport
Former:
1994-M BRG 214 SEi
1995-N Silver 214 SEi
1995-N Nightfire Red 214 SEi
1995-M Silver 216 SLi
1993-K Caribbean Blue 216 Cabriolet
1990-G White 416 GSi
+ a 25, 45 & 75

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Johnny 216GSi
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Posts: 1731
Joined: Wed Nov 19, 2014 10:17 pm
Car Ownership: Rover 216 Hatchback
Location: Birmingham - the home of Rover!

Re: T series Throttle Body clean

#4 Post by Johnny 216GSi » Thu Nov 02, 2017 11:25 pm

Paul_1978_yorks wrote:That's great, many thanks. Is removing the battery to creat space or for another reason?

I'm slightly reluctant to disconnect the battery due to potentially activating the immobiliser as the documentation didn't include the key sequence :closedeyes

Finally, what's the throttle pot and shift motor? Many thanks!
Throttle pot is the Throttle Position Potentiometer. It's a variable resistor energise by voltage - the return voltage tells the ECU how open the throttle is (where your foot is on the accelerator peddle).

It's used by the ECU to switch into "panic mode" when you request (with your right foot) that the car should go faster. The ECU creates ad-hoc fuel enrichment pulses to the injectors to make sure the air to fuel ratio at the intake valves on the cylinders remains in the ratio 14.7:1, the stoichiometric value.

No idea what the shift motor is for, sorry :sad
Rover 216GSi K reg. Flame Red over Tempest Grey

Paul_1978_yorks
Club Member
Posts: 1427
Joined: Mon Jan 22, 2007 11:11 pm
Car Ownership: Rover 216 Hatchback
Location: Wakefield, West Yorks

Re: T series Throttle Body clean

#5 Post by Paul_1978_yorks » Fri Nov 03, 2017 7:29 am

Good stuff Johnny. How do I identify it? What does it look like?
Current:
1996-N Nightfire 420 GSi Tourer
2005 Volvo V50 1.8 Sport
Former:
1994-M BRG 214 SEi
1995-N Silver 214 SEi
1995-N Nightfire Red 214 SEi
1995-M Silver 216 SLi
1993-K Caribbean Blue 216 Cabriolet
1990-G White 416 GSi
+ a 25, 45 & 75

Cromp85
Getting Settled In
Posts: 18
Joined: Fri Oct 02, 2015 11:24 am
Car Ownership: Rover 220 Nasp Hatchback
Location: Dudley

Re: T series Throttle Body clean

#6 Post by Cromp85 » Fri Nov 03, 2017 3:07 pm

Paul_1978_yorks wrote:That's great, many thanks. Is removing the battery to creat space or for another reason?

I'm slightly reluctant to disconnect the battery due to potentially activating the immobiliser as the documentation didn't include the key sequence :closedeyes

Finally, what's the throttle pot and shift motor? Many thanks!
Throttle pot is the plastic block on the left of the assembly with a 3 pin plug.
Shift motor is what sets the engine idle speed, and is located on the right side.

I only suggest removing the battery so there is no risk of shorting anything electrical. Do you have a working fob? If so you can just re-sync it by repeatedly pressing unlock after reconnecting the battery.
My Rovers to date:
1994 Rover 220GSI in Tahiti blue (On the road)
2002 MG ZR 105 in Solar red (On loan)
1995 214i (On SORN)

Paul_1978_yorks
Club Member
Posts: 1427
Joined: Mon Jan 22, 2007 11:11 pm
Car Ownership: Rover 216 Hatchback
Location: Wakefield, West Yorks

Re: T series Throttle Body clean

#7 Post by Paul_1978_yorks » Sun Nov 12, 2017 7:13 pm

Hi all, just an update....

I cleaned the throttle body today using some carb/throttle body cleaner.

It actually seemed reasonably gunk free which is must be a good sign. I also cleaned out the thin black tube with the carb cleaner and a couple of vacuum hoses.

Car seems to idle a bit better now, but I still occasionally get a momentary loss of revs on pressing the accelerator.
Current:
1996-N Nightfire 420 GSi Tourer
2005 Volvo V50 1.8 Sport
Former:
1994-M BRG 214 SEi
1995-N Silver 214 SEi
1995-N Nightfire Red 214 SEi
1995-M Silver 216 SLi
1993-K Caribbean Blue 216 Cabriolet
1990-G White 416 GSi
+ a 25, 45 & 75

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