Thread: V8 - Load stalling driving me crazy

Hi guys,

Cockie55, thanks for your input. I will try to measure the TPS at idle, and see how the voltage behaves at idle and on the return of the throttle plate...

Philip, I confirm the problem only occurs when engine is hot, with thermostat opened. When cold and during warm up, everything is fine.
Changed the plugs and plug leads say 100 km ago. The plugs were all "perfectly" brown.

Scouse, thanks for the feedback, even if out of thread, you are the first one I met that has ever seen a late D1 with the C suffix engine :-) Do you have further details you could please PM me about the recall A156 (fuel tank leak check) ?

Pibby, thanks for the idea, I will double check the voltages at the ECU plug.

Cheers

Erik.

Hi guys,

I was a bit short on time today, so I did everything in one operation... so the shame (read stupid) part of it, is I do not know which operation seems to have improved things...

Here is all things done :
-> engine fully warmed, plugged both sides of hose, stepper to plenum, and checked base idle (only dash tacho, even if not accurate, it is all I have) : just in the middle between 500 and 750. So quite close to 600, which seems great.

-> removed the stepper : the plunger was shining clean !!! damn'it. Never mind, soaked in WD40 and a little cleaning with tooth brush.
The plenum housing side where plunger rest was like covered with a black powder (like gun powder), but not sticky... Cleaned with carb cleaner and rag. Refit.

-> removed rocker cover breather vapor trap, and cleaned it
-> removed all the breather hoses, including the little Tee, up to the plenum and cleaned everything with carb cleaner. The little side of the TEE was quite filled of sooth

-> tried to clean the area were the butterfly close on the plenum

-> checked the gap between butterfly and plenum with a piece of paper. On the bottom, no gap at all, but on the 9 to 12 o'clock part of the disk, I can feel the strip of paper moving ok.

-> cleaned the MAF with carb cleaner

-> refit everything, and checked TPS voltage, ignition on and also engine idling : voltage rock stable and always returning to the same value +/- 0,03 V, but at about 0,29 V
=> ovalate holes and made it to 0,34 V, rechecked idling and on the return to idle after a little gaz : ok to 0,34 +/- 0,02 V

Went for a test drive after that, and really seems to have improved :-))

Time will tell... I will repost in a while to tell how it is going...

If it is the cleaning that has done wonders, I am a bit worried because the engine has only done barely 2000 km after having been completely overhauled and cleaned... so that is not much before re clogging up !!

Anyway, thank you all for the ideas, and I am sorry not to have taken the time to do the tests one after the other to know exactly which one was THE ONE !

Cheers

Erik.