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#1 | ||
Starter Motor
Join Date: Aug 2007
Posts: 8
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Hi just wondering if anyone can help me. My AUII is missing at idle in gear and out. When I slow at the lights and it changes back to first it gives a shudder and the idles drop to about 400rpm. It doesnt do so every time but 60 percent of the time. Someone suggested it was the idle step up motor which I have had replaced( the car idles in gear at 500 to 600rpms) it has made no difference at all except idling in gear is a bit higher. We have done plugs, leads (just had the fuel regulator replaced cos it was overfueling).The longer you sit waiting at lights etc the worse the miss gets but normal driving the car is fine. Fords have said they cant find anything wrong. I dont know what else to do!
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#2 | ||
FF.Com.Au Hardcore
Join Date: Aug 2006
Location: Salamander Bay
Posts: 5,427
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have the mechanics pluged in the diagnostic scanner?
there should be a fault code showing up. might be the map sensor but at $150 + you don't want to change it unless you know |
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#3 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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A vacuum leak will normally only show up at idle, check your inlet manifold gasket for leaks or even just vacuum lines fallen off/broken
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#4 | ||
Regular Member
Join Date: Aug 2007
Location: Parramatta, SYD
Posts: 378
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have u gave throttle body and ISC a very good clean?
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#5 | ||
Starter Motor
Join Date: Aug 2007
Posts: 8
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Thanx everyone for the info I will have hubby onto it this weekend. And yes Ford have plugged it in and says theres nothing wrong and everything is within specifications.
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#6 | ||
Adapt or perish...
Join Date: Jan 2005
Location: Dip!@#$
Posts: 7,954
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Would the O2 sensor cause any of these problems? I would think especially with a previous overfueling issue that the sensor could be shagged.
Which reminds me... I must get that replaced.
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Carless
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#7 | |||
FF.Com.Au Hardcore
Join Date: Aug 2006
Location: Salamander Bay
Posts: 5,427
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Quote:
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#8 | ||
Walking with God
Join Date: Mar 2005
Location: Melbourne
Posts: 7,321
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What about cleaning the throttle body?
Cleaning Throttle Body http://www.fordforums.com.au/showpos...2&postcount=48 GK
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2009 Mondeo Zetec TDCi - Moondust Silver 2015 Kia Sorento Platinum - Snow White Pearl 2001 Ducati Monster 900Sie - Red Now gone! 1999 AU1 Futura Wagon - Sparkling Burgundy On LPG Want a Full Life? John 10:10 |
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#9 | ||
Audi S3
Join Date: May 2005
Location: Sydney.
Posts: 8,307
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mine is teh same.
ive done leads, plugs, ISC, throttle body, reset ecu and base idle, but still idles sh/t. drives good though.
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#10 | |||
Banned
Join Date: Feb 2006
Location: Castlemaine, Central Vic
Posts: 264
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#11 | |||
Sly like a G6
Join Date: Jun 2006
Location: Hunter Valley Whine Country
Posts: 1,808
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Quote:
Would someone mind disconnecting their O2 sensor long enough to run their car up to operating temp and post back what happens? TIA, Tony.
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The Frankenfalcon... AU1.5 Wagon, BA brakes, AU2 booster, BA2 XR6T engine, stock from airbox to turbo, 8psi/98 octane tune 240RWKW, BF XR6T cat, quiet 3" zorst, Pex BSO660 & BSO439 mufflers, 84 db, built BTR box, 3.08 LSD, Emer SVI LPG, AU1 XR8 alloys, Momo wheel, JVC KDR746BT head unit, Aerpro steering wheel control wiring. Sleeper, anyone? |
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#12 | |||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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Quote:
If the o2 was left unplugged it will cause the light to come on, but maybe not immediatley, as the ECU does testing of all it's sensors by doing a test cycle called a trip. Different manufacturers have different trips and different sensors have different trips. Basically a trip is a test cycle the ECU looks for, ie the car may have to run at operating temp for 5 minutes and in thet time perform x amount off accelration cyles and do a road speed of x amount (purely speclative cycle) for the ECU to determine whether the sensor is working correctly.
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#13 | ||
Sly like a G6
Join Date: Jun 2006
Location: Hunter Valley Whine Country
Posts: 1,808
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Hmmmmm. Just took the car around the block twice (20 minutes / 26 km) with the O2 sensor disconnected. No red light, no LHM, just drove exactly as it has for ages. It was prewarmed too, I had it idling for 1/2 hr with the sensor unplugged before reading ratter's post, hoping to get it into closed loop and throw an error.
Not sure whether I drove it long enough to self-test, but surely going into closed loop and getting no O2 reading would cause a problem? Have had issues of spontaneous stalling / immobilisation over the last 6-8 mths or so with no DTC's to give any clue. The bloke I get to scan it thinks there may be some dodgy wiring (he hates afermarket LPG installs, J3 chips etc). Sounds like the PCM may be getting a voltage on the O2 input that's coming from somewhere else via a dodgy joint or worn insulation? This might give a sparky a starting point. I'd hate to take it to a sparky and have to say "check the entire engine bay and dashboard looms and all the sensors". Would cost a bit unless he was lucky.
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The Frankenfalcon... AU1.5 Wagon, BA brakes, AU2 booster, BA2 XR6T engine, stock from airbox to turbo, 8psi/98 octane tune 240RWKW, BF XR6T cat, quiet 3" zorst, Pex BSO660 & BSO439 mufflers, 84 db, built BTR box, 3.08 LSD, Emer SVI LPG, AU1 XR8 alloys, Momo wheel, JVC KDR746BT head unit, Aerpro steering wheel control wiring. Sleeper, anyone? |
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#14 | ||
The Ancient Warrior
Join Date: Jan 2005
Location: The Qld Border Ranges
Posts: 346
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Here is an answer from a mechanic to a question asking whether a faulty oxygen sensor could cause poor idling;
Oxygen sensors read the fuel mixture in the exhaust and send the information to the computer. The computer then adjusts the fuel mixture. By not replacing faulty oxygen sensors, you can expect erratic idle and poor running. Your car probably will not quit running but there could be damage to the catalytic converter I don't know how many K's you car has travelled, but it wouldn't hurt to fit a new oxygen sensor anyway. You've nothing to lose and they do have a use by date. |
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#15 | ||
Banned
Join Date: Mar 2005
Posts: 419
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mines the same also reversing out of drive way and slight steer it shudders when just idling out and pull up at lights a vibration,
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#16 | ||
FF.Com.Au Hardcore
Join Date: Apr 2006
Location: Brisbane
Posts: 1,770
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mine only started doing that after i used the flash tuner... car runs like a dream tho.. seems to be doing it less and less tho
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#17 | ||
Guest
Posts: n/a
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Are the grounds ok?
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#18 | ||
Sly like a G6
Join Date: Jun 2006
Location: Hunter Valley Whine Country
Posts: 1,808
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NFI. How do I check them?
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The Frankenfalcon... AU1.5 Wagon, BA brakes, AU2 booster, BA2 XR6T engine, stock from airbox to turbo, 8psi/98 octane tune 240RWKW, BF XR6T cat, quiet 3" zorst, Pex BSO660 & BSO439 mufflers, 84 db, built BTR box, 3.08 LSD, Emer SVI LPG, AU1 XR8 alloys, Momo wheel, JVC KDR746BT head unit, Aerpro steering wheel control wiring. Sleeper, anyone? |
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#19 | ||
Sly like a G6
Join Date: Jun 2006
Location: Hunter Valley Whine Country
Posts: 1,808
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On second thoughts... a grounding problem would cause the speedo needle to shadow the tacho needle while giving the throttle a blip in Park? So how do I go about finding where the problem is?
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The Frankenfalcon... AU1.5 Wagon, BA brakes, AU2 booster, BA2 XR6T engine, stock from airbox to turbo, 8psi/98 octane tune 240RWKW, BF XR6T cat, quiet 3" zorst, Pex BSO660 & BSO439 mufflers, 84 db, built BTR box, 3.08 LSD, Emer SVI LPG, AU1 XR8 alloys, Momo wheel, JVC KDR746BT head unit, Aerpro steering wheel control wiring. Sleeper, anyone? |
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#20 | ||
Starter Motor
Join Date: Aug 2007
Posts: 8
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Well got my dad to clean the throttle body but it made no difference. Then he put the idles up so it idles in park at 750-800rpm. Now in gear with my foot on the brake it idles at 650rpms. Now it doesnt stall when I come to a stop at lights etc. Hooray!! Still has a slight miss intermittently when idling in gear but I suppose I will have to live with that. At least it doesnt stall now!!
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#21 | |||
FF.Com.Au Hardcore
Join Date: Aug 2006
Location: Salamander Bay
Posts: 5,427
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sorry for thread mining but just noticed this response . you should never adjust the base idle it factory preset . if this fixed it i would say your ics is faulty
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#22 | |||
Nitro
Join Date: Nov 2020
Location: Western Australia
Posts: 1
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Quote:
I was about to say adjust the throttle body stop screw like I did and for me it stopped the rev hang when stopping and all the hesitation disappeared just from a little turn of a screw....after all the new components I replaced ISC TPS coil packs leads plugs hahaha for me it was just a 1/4 turn of the stop screw and she idles and drives beautifully now.. Anyway going to go and check myself into a mental institution now my brain is fried. |
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#23 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Melb north
Posts: 12,025
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probably a long shot but coil packs might be worth closer inspection, how many k`s has the car done??
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#24 | ||
Audi S3
Join Date: May 2005
Location: Sydney.
Posts: 8,307
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my car has only just ticked over 140 000. hmmm ill get some injector cleaner soon. but the injectors arnt ticking so i doubt they are that dirty.
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#25 | |||
Moderator
![]() ![]() Join Date: Feb 2005
Location: Kenthurst
Posts: 40,394
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Quote:
also being an EGAS model ... getting it to miss under load (ie: one hell of a decent backfire) scared the crap out of the cabbie driving next to me (no damage to the intake thank goodness). It maybe a vacuum leak as mentioned (should have able to hear a sucking sound from the intake manifold usually) ... another thing it might be is the power steering switch ... this can cause issues with erratic and low idle too (someone mentioned a grinding sound as well).
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The Current Stable 2016 SZII TS Territory RWD Petrol The Evolution of the EGA54D utes AU Workshop Build thread of EGA54D B-Series Workshop Build thread of EGA54D 2004 SX TX Territory AWD - Gone but not forgotten 2010 FG XT "The ex-rental" - Moved onto a new home Mechan1k's Flickr Page |
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#26 | ||
Starter Motor
Join Date: Aug 2007
Posts: 8
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My car has only done 110,000kms. Heaps better to drive today only missed twice while waiting at the lights. Thanks everyone for your input. Much appreciated!!!!!
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#27 | ||
Starter Motor
Join Date: Mar 2007
Location: Hobart
Posts: 8
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My car has done 85,000km and started to miss occasionally at idle about a month ago. Has anyone licked this issue yet?
At the end of March I'm moving to Qld from Tassie and will be driving up towing my 4.55 metre boat. I don't want any hassles en route. I have had all the plugs and leads changed, had the injectors cleaned but nothing changes it. ![]() ![]() I noticed that it occurs less frequently with the air con on - probably because of the higher idle speed.
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Cheers, Jeff http://www.aufalcon.com/ubuxkl |
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#28 | ||
Next upgraded Mk1 Leopard
![]() Join Date: Jan 2005
Location: Sydney, in the burbs
Posts: 4,908
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Are you using a high flow air filter?
UK
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Plastic Surgery 1 AUII Monsoon Blue How 2's: Change rear view mirror, Install backfire valve, Change foam front seats, Install auto transmission cooler, Replace Trans Shift Globe, Remove front door Trim, Paint AU headlights, install door spears, Premium Rear Parcel Shelf, go here...
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#29 | ||
Custom user title
Join Date: Jan 2005
Posts: 1,892
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manifold gaskets tend to crack and split.. this causes a leak at idle giving a rough idle... Use some CRC / water hell anything and spray it over the manifold where its bolted to the head.. if u hear a loud hissing or it runs differntly then thats ya prob.. i
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#30 | ||
FF.Com.Au Hardcore
Join Date: Sep 2007
Location: Scarness, Hervey Bay.
Posts: 830
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I've had a rough idle, but fine when driving issue.. an LPG conversion has fixed it. I can only put it down to something related to the petrol system.. Injector, pump, filter?
EDIT: If I switch back to petrol it idles rough as always, but LPG is nice and smooth. |
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