Erratic Idle Erratic Idle
#1
Posted 04 July 2017 - 06:16 AM
the wife Puma (1.7), has started (last few weeks), to have a very odd idle. when stopping at lights or stationary for any period the initial idle will be as normal ~ 1000rpm, but then after 30 second or so it will hesitate and either drop to ~800 or even lower 600 (if the lower of the two the battery light will come on). Feel like running on 3 at this point and sometime dies. Usually now when stopped I just tickle the throttle to keep it where it should be and all is fine. Work totally normally at all other engine speeds.
Have changed the plugs, HT leads and the coil pack. No change.
Any ideas? Alternator?
#2
Posted 04 July 2017 - 09:10 AM
#3
Posted 04 July 2017 - 09:12 AM
#4
Posted 04 July 2017 - 09:29 AM
Do you have link to the Idle control valve? I'll try a google.
#5
Posted 04 July 2017 - 10:20 AM
#6
Posted 04 July 2017 - 10:35 AM
#7
Posted 04 July 2017 - 11:29 AM
Gasket often leaks after can belt change of it is not reseated properly.
#8
Posted 04 July 2017 - 12:10 PM
happy-kat, on 04 July 2017 - 11:29 AM, said:
Gasket often leaks after can belt change of it is not reseated properly.
Gasket often leaks after can belt change of it is not reseated properly. Do you mean Cambelt?
Presume a gasket on back of the ICV? will this getting bugger removing and have to get a new one or use instant gasket or make one from https://www.complete...ing-3-0mm-thick (make all my gaskets for racers with this stuff (take time but worth it)).
#9
Posted 04 July 2017 - 06:31 PM
#10
Posted 05 July 2017 - 06:17 AM
Clean MAF wires (order MAF Spray cleaner (if the small bolts holding top in it can be gotten out easy).
* Should have said, had filter out for a good clean).
Clean ICV.
Pop in a new Lambda (normally when this goes you can tell with really bad drop in MPG - I do not religious check this but if it was consistently creeping below 270 mile on a fill up it might point to that, 1 get 265 - 290 generally - and don't hang about on daily 45-50 mile commute).
Have a race pipe to put on to do away with centre box, just not gotten round to it with a bunch of other cars in the Q before. V.soon, wife will love it!
#11
Posted 05 July 2017 - 08:45 AM
There is also the crappy little pipe just behind headlight for power steering that ages and compresses. Sorry I'm on tablet again but that pipe is mentioned in wiki article on erratic idle.
#12
Posted 05 July 2017 - 08:57 AM
Found this http://www.fordwiki....%3ASearch&go=Go but not the exact URL. Can someone else drop the link into a reply.
#13
Posted 05 July 2017 - 02:35 PM
#14
Posted 05 July 2017 - 08:30 PM
#15
Posted 06 July 2017 - 07:16 AM
for anyone else so they do not have to go via the wiki.
ICV suggestion =
Clean Idle Air Control Valve (Idle Control Valve) <br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">1.Undo two 8mm bolts holding the IAC on to the engine.<br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">2.Disconnect the sensor from the IAC.<br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">3.Remove rubber gasket and inspect for damage and corrosion, replacement is advised.<br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">4.Spray the inside of the icv with carb cleaner and leave it for about 5 min to dissolve the carbon buildup. repeat this a few times till you are satisfied it is clean.<br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">5.Reseat the gasket and reinstall.<br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><br style="color: rgb(28, 40, 55); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: arial, verdana, tahoma, sans-serif; font-size: 11.7px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; orphans: 2; widows: 2; background-color: rgb(250, 251, 252); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">6.Bolts are set at 9 Nm (6.64 Ib/ft)
Idle Flaring thread =
After months now of pratting around with my Fiesta and spending Hundreds of pounds buying parts for it....not to mention tripping up and down all over the country..
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I'll work through both of those.
Oddly it seems slightly better when stuck in rush hour traffic with the Ac on!
#17
Posted 06 July 2017 - 01:58 PM
http://www.gomog.com...ambda%20Sensor.
#18
Posted 06 July 2017 - 02:03 PM
Idle Symptoms and Possible Causes/FixesPoor idle when warmVacuum Leak
Crankcase Breather Valve
Plenum Leaks
Pulse Air Injection
Pulse Air Injection SolenoidPoor idle when coldVacuum Leak
Wrong OilHigh hanging rev (normally when cold)Throttle Body ResonancePoor idle at all timesVacuum Leak
HT Leads
Spark Plugs
Rubber T Piece
Idle Speed Control Valve
Auxiliary Drive Belt pulleys
EGR Valve
Lambda SensorPoor idle at some timesVacuum Leak
EGPD valve
HT Leads
Spark Plugs
Inlet Air Temperature Sensor
EGR Solenoid
Heat Soak
Throttle Body Gasket
Throttle Body Position SensorBad idle and stalling when warmLoose EpromWill work through the ones for Hot and cold over and above those already done, plugs, HT and Coil pack.
#19
Posted 13 July 2017 - 06:28 AM
After replacing the plugs, coil pack, (rocker gasket seal - not to do with idle issue), then yesterday taking the ICV and the MAF off and cleaning (with brake cleaner and MAF cleaner respectively). Start it up, seems to run smoother, but after a minute same bloody idle rev drop. So that had not changed.
Then noticed a brace air tube sticking out from the inlet manifold (below and to the right of the ICV), that seemed to have nothing connected to it (odd). Put my finger over the end (engine running), Ta da, FIXED!!!!!!!!!!!!!!!!!!!!!
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** What's this about updating my account to allow 3rd party Hosting of pictures? Can find the bit in My Profile to do this.
This post has been edited by jellison: 13 July 2017 - 06:29 AM
#20
Posted 13 July 2017 - 09:09 AM
Sure you aren't reading a photo bucket message.