Thread: Possible TPS fault?

Yes good point. Truebritbiker has not stated 3.5 or 3.9 but the 3.9 came with 89 model year so I assumed 3.9.

Although there seems to be some confusion in Australia because some I believe 88 UK model year cars were sole in Australia as 89s.
So come on trubritbiker tell us.
I never had a stalling problem on the "Federal" injection that I fitted to my 77 and that is very similar to the Flapper on the 88.
Regards Philip A

Sorry, it's a 3.5V8. It does not have a bypass air valve at the rear of the plenum. It does appear as though there are still some parts on it from when they were carburated, my heater hose's are from the carb model. I guess it was possibly a transition year, or "send it to Australia they won't know any different". Could you elaborate as to what the "flapper" is. I bought the Rangie at the end of November and had to do a few things to it to get a RWC, nothing major (undersize disc's, windscreen). According to the handbook it was supposed to have been last serviced Jan 2010, judging from all the crud that I removed from inside the throttle body and the general internal condition (that is visible) Neglect is the order of the day. The breather hose from the flame trap was almost blocked solid with carbon deposits, I dread to think what the inside is like.

The Flapper is the Air flow meter (AFM) which has a flap inside which reacts to the volume of air passing through it. They have a temperature sensor inside so that mass can be calculated.
You do not have an IAC, so the only idle control is the idle screw.
They have a secondary air valve for fast idle when cold, and a cold start injector.
However the reasons for stalling are similar to the 14CUX except for the IAC which doesn't exist. Check that the idle speed is high enough.

The flappers are pretty well worn by now and it may be worthwhile checking the idle mixture. If it is lean then they can be adjusted by someone who knows them , by altering the spring tension inside. An OLD as in elderly European car specialist in Mercs or BMWs may be able to help as the flapper are Bosch and were fitted to all old European injected cars.
Regards Philip A

Originally Posted by trubritbiker

Sorry, it's a 3.5V8. It does not have a bypass air valve at the rear of the plenum. It does appear as though there are still some parts on it from when they were carburated, my heater hose's are from the carb model. I guess it was possibly a transition year, or "send it to Australia they won't know any different". Could you elaborate as to what the "flapper" is. I bought the Rangie at the end of November and had to do a few things to it to get a RWC, nothing major (undersize disc's, windscreen). According to the handbook it was supposed to have been last serviced Jan 2010, judging from all the crud that I removed from inside the throttle body and the general internal condition (that is visible) Neglect is the order of the day. The breather hose from the flame trap was almost blocked solid with carbon deposits, I dread to think what the inside is like.

G`day , don`t be sorry as it`s not warranted and i chose my wording .

You`re new here , it should have been suggested initially that the more and precise information you can share the easier it can be .

Just mentioning the carbon build up tells alot , the crankcase vent system generally needs to be in good nick and these ones will block things including passages in the inlet manifold .

The flapper thing comes from the airflow meter , there is a mechanical vane inside that moves as a flap .
The flapper system have more parts to it that the hotwire system .

The tps on yours is made for adjustment , the hotwire tps can be adjusted . (325+-35Mv)
They not only tell the ecu throttle position but also tell ecu that the throttle is not open .

Your problem could be related to many things ,
cold start system - thermotime switch . If it`s working right is has no effect when the engine is at running temp , if it`s not it can have .

Solenoid air valve although for ac , no effect if working right but has if not .

Tps no effect if right has if not .

Vaccum switch no effect if right has if not .

Just to be clear when i put no effect i mean to your problem and there are other things but this is just to give an idea .

The probem now of not starting hot may or may not be the same thing .

If you happy with your idle as it is .

I`d suggest you check your CTS coolant temp sensor this is the one that talks to the ecu it has a plug like an injector plug and is on top of and frt of the inlet manifold left i think . The sender for the temp gauge is at the frt and low on the manifold . OHM meter

0- deg C , 5.7k-5.9k

80 deg C , 0.3k-0.4k

And also the ATS air temp sensor this is a part of the airflow meter . ecu/airflow meter pins 6 and 27 . U/R and R/B
measure pins at afm disconnected and temp front pipe off afm at left top orifice .

-10 deg C , 8.26-10.56
+50 deg C , 0.75-0.91

Just in case = Right hand drive vehicle passenger side is left , i do it this way so`s not to confuse myself anymore than usual .

peter