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Topic: Idle problem. (Read 2266 times) |
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Simmo
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Idle problem.
« on: Jul 20th, 2006, 2:33pm » |
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Have recently experienced problems with the idle on my 2.0lt 16v. On dipping the clutch,for example ,at a junction,the revs will fall to about 500 or lower and occasionally will stall. Stall is much more likely if Air con is running. Have cleaned and swopped the IACV but no change. Injector cleaner has been added and the fuel filter renewed. All wiring seems sound. No sign of air leaks,MAF cleaned and all connections checked for security. Any ideas where I go from here please?.
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Dave
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Tourmallard 24v (ex-owner)
Posts: 1984
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Re: Idle problem.
« Reply #1 on: Jul 20th, 2006, 2:52pm » |
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It may be worth checking that the throttle body and butterfly valve(s?) are clean, along with any throttle cable return springs etc.
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Simmo
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Re: Idle problem.
« Reply #2 on: Jul 20th, 2006, 3:16pm » |
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Thanks Dave, they've previously been well dosed with carb cleaner and externally the linkage has been cleaned and lubricated.
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Dave
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Tourmallard 24v (ex-owner)
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Re: Idle problem.
« Reply #3 on: Jul 20th, 2006, 3:17pm » |
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Not familiar with the 2.0 but could it be something in the tps area, similar to this:
http://www.fordscorpio.co.uk/obd2scan9.htm
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sector-9
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No scorpio anymore
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Re: Idle problem.
« Reply #4 on: Jul 20th, 2006, 9:36pm » |
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You could try pulling off the vacuum hose from the EGR valve diaphragm - don't forget to plug the hose though otherwise it will weaken the mixture!
Also check all the vac hoses for splits or leaks for the same reason.
Darren
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Simmo
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Re: Idle problem.
« Reply #5 on: Jul 21st, 2006, 8:52am » |
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Dave/Darren. Thanks for that. I have followed your tips and having read your thread Dave I disconnected the battery for a couple of minutes,as stated, and having just taken the car for a quick run there does seem to be an improvement. Reading that link I wonder if the TPS has been confused as a result of opening the throttle wide in order to clean the carb and the butterflys?. Anyone got any views or experience of that?. Mike.
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Dave
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Tourmallard 24v (ex-owner)
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Re: Idle problem.
« Reply #6 on: Jul 21st, 2006, 9:23am » |
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In the page about the tps it says that it could have gone out of synch with the ECU if the throttle were pressed while turning the ignition on.
I would think that exactly the same thing applies to cleaning the butterfly valves. Perhaps if the valves did not quite return to their natural position until the accelerator had been pressed once or twice then it would log an incorrect tps value.
Not got any personal experience of that to draw upon though, just my thoughts 
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Simmo
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Re: Idle problem.
« Reply #7 on: Jul 23rd, 2006, 6:38am » |
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A recent similar post (Idle problem 12v) mentions the 'adjustment' of the IACV by turning a screw in the end of the unit. I can see the screw mentioned but before tampering with it I wondered if anyone else had done so or had any views on the subject. I have never seen this referred to previously or is it just another quirk of the Scorpio that has remained un-discovered!!?
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Tompion
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1997 2.3 Ultima estate.
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Re: Idle problem.
« Reply #8 on: Jul 23rd, 2006, 1:19pm » |
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I suspect it's factory set - not intended for adjustment.
Having said that try a quarter turn or so either way and see if it helps (let it settle for a while between adjustment). As long as you keep a check on how far you turn it you can set it back as it was.
Don't screw it in too tight, it's a plastic screw & the head breaks easily.
Dave
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Simmo
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Re: Idle problem.
« Reply #9 on: Sep 7th, 2006, 4:04pm » |
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Gentlemen. I have had a scan. nothing found, I have today swopped the IACV with one from Shaun which was known to be ok, and the problem still exists, No sign of air leaks and all hoses sound with no signs of deterioration.Air filter, MAF,trunking ,all secure and clean ,throttle linkage free and butterflys' not sticking. Any more ideas please. Apart from this niggle the car runs well and returns 29mpg. (2ltr 16V).
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Simmo
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Re: Idle problem.
« Reply #10 on: Sep 9th, 2006, 12:52pm » |
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Help!!. Had a scan this morning at my friendly garage. Fault P0113 came up, Inlet Air tempSensor, High Input. Replaced sensor, £28 !!. No b.....y difference to idle problem. On reading the scan the Pre cat Sensor was reading between 60 and 900. The Post cat sensor was reading between 100 and 137. The EGR was showing a reading of 0.14v. Can anybody please make any sense of these figures?. By the way the quote for a new Pre cat sensor was £115 +vat!!.
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Jonnycab
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Former owner of 2.3 Ultima Facelift saloon
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Re: Idle problem.
« Reply #11 on: Sep 9th, 2006, 1:23pm » |
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Have you checked the wiring under the engine cover. Also the 2 plug leads, coil packs for damage & spark plugs.
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Simmo
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Re: Idle problem.
« Reply #12 on: Sep 9th, 2006, 3:01pm » |
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J/C. Yes have replaced the wiring through the head,all soldered etc, plugs,coil packs etc. checked and appear sound. Driving me nuts!!. Disconnected battery at lunchtime thus forcing a re-set but no significant change. Have since done 20+ miles of urban and fast main road but again no change.  .
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scorpio_man
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Ford Kuga awd
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Re: Idle problem.
« Reply #13 on: Sep 10th, 2006, 9:46pm » |
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hi mike
i take it the reading from the lambda is from 0 to 1 volt, so your reading seems fine. were you able to tell how fast it was switching? a replacement one (needs soldered in) costs about £30 (ford only sell rear ones now, afaik. different plug), from here
not sure about egr reading. 
how's your a/c? when was it regassed? still think it's the idle valve, but hard to tell from a distance.
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tommy1340millar
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Re: Idle problem.
« Reply #14 on: Sep 11th, 2006, 12:30am » |
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also, check for cracked exhaust manifold - my 2.0 16v was doing the stall thing & surging, I needed a cat for mot, and the exhaust manifold was cracked. got it welded up. It was ok for a couple of months, but now I can hear either an exhaust blow or the manifold crack has reappeared, and the potential stalling has reappeared.
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Simmo
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Re: Idle problem.
« Reply #15 on: Sep 11th, 2006, 6:52am » |
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Andrew/Tommy, I have changed the IACV with one from Shaun that was known to be working. When the scan was running the Pre cat sensor reading was changing rapidly between a reading of 60 and 900 whilst the post cat one was cycling between 100 and 137. Whatever those figures mean!!.The EGR showed a reading of 0.14v. I checked the exhaust manifold, which is a fairly new one, whilst checking the connections to the Egr etc. and that is sound. This site sells direct replacement sensors apparently.
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Simmo
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Re: Idle problem.
« Reply #17 on: Sep 11th, 2006, 7:11am » |
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Thanks Dave, Thats the firm that Andrew put up the link for. Still hoping to hear from Eric who has the scans that Paul did. Mike.
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Simmo
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Re: Idle problem.
« Reply #19 on: Sep 12th, 2006, 6:56am » |
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Dave, Thanks for that. The link you put up will be of interest to all those 'experts' and 'engine builders' we have out there I am sure. Gendan of course indicate that it is a direct replacement for the ones on our cars and that is no doubt why. Mike.
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