throttle pot collywobbles??
Discussion
Help! Have I got the dreaded throttle pot collywobbles? Are these the symptoms? Driving to London in my S2 from Stoke yesterday morning after 11/2 hours steady running the engine started missing, stuttering, picking up, sounding flat like a wet blanket being thumped, more throttle brought no response then in with a bang. Made the Oxford services and called the AA. Change of plugs and all seemed fairly well. Again after about 1 1/2 hours steady running reached the A3 turn off from the M25, off the throttle and the missing begins. Reach the A3 to Kingston and the car is missing and kangerooing. Called the AA again, but scratched heads. By now the car has cooled and I make it to my daughter at Wimbledon. Later set off home with fingers crossed. Again 1 1/2-2 hours in of steady running, decelerate and woops no pick up, just missing, gasping, no throttle response, runs just sounding flat and dead. It's late and I keep going wanting to be home. Ease the throttle a bit and it begins to run better. Decelerate through the M6 roadworks north of B'Ham and it misses and stutters. So it runs better at 80 than at 50! Drive on, feels like the engine mixture is over rich (like a car on full choke when hot), accelerate hard to see if it clears. It does sort of. Enough to get me home. The thing is every time I decelerated the symptoms returned.
Does any of this sound familiar to you? Can you tell where I should begin looking for solutions please? Thanks.
Does any of this sound familiar to you? Can you tell where I should begin looking for solutions please? Thanks.
Rodger,does sound very similar to my Pot woes.I also found that it ran better in revs than lower in the rev range.Also if you try to start it from cold,it would not run at all and was so rich out the exhaust.It takes 5 mins to change and only £25.If its not then take it back to the Ford garage.I also bought the connector for my S3,but it didnt need it.Don't know what your S2 loom is like.Does sound rather probable tho.
Had this problem with my S2. Seriously if you unplug the throttle pot, which is on the side of the plenum attached to the butterfly spindle, the ECU will default to a "get you home mode".
You will lose some functions of the ECU like reduced fuelling on overrun and no provision for mixture enrichment at wide open throttle but the problem should go away. If it does go away then you need a new pot.
I ran for a while like this until I could afford a new pot (I was a student....)
Hope this helps
You will lose some functions of the ECU like reduced fuelling on overrun and no provision for mixture enrichment at wide open throttle but the problem should go away. If it does go away then you need a new pot.
I ran for a while like this until I could afford a new pot (I was a student....)
Hope this helps
HAd a similiar problem on my S3 but after a long journey, 60+miles it would start hunting.
Anyhow change the Pot to no avail and in the end after checking Fuel lines/filter got a Mobile Auto tuner to come around and have a look.
He found the problem and it was something that plugged into the EMU that was faulty and sending the wrong signals(will look for the part no), but might be worth a shot, to memory i think it cost me about £80 for the part an engine tune and labour.
BB
Anyhow change the Pot to no avail and in the end after checking Fuel lines/filter got a Mobile Auto tuner to come around and have a look.
He found the problem and it was something that plugged into the EMU that was faulty and sending the wrong signals(will look for the part no), but might be worth a shot, to memory i think it cost me about £80 for the part an engine tune and labour.
BB
roger brown said: HT leads? Umm, dunno. They're black, fitted with supressors and look pretty ancient. I don't suppose there is a way of checking them on the car is there?
If they're of uncertain vintage you're better off replacing them.
I use the (red) Motorcraft leads set p/n 5030306 (£25-ish).
The 7 "Adapters" that sit on top of the dist cap are p/n 6081467 (£2.95 each).
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