From my experience with Ford and holden to say a faulty map would only mean that after power is remove from system (battery) for more than 10 seconds this allows the ecu to dump its memory (map) and on first start up a procedure can be used like holden first start take revs to somewhere around 2500 and with attention to keeping the accelerator pedal position still at all times as once the revs level at 2400 2700 and keeping accelerator still you will notice the revs and even the timing alter a number of times the will sound tighter or loser as the ecu reads sensors and maps (tunes) the engine this is normally 60 sec in the manual i allways let 1min30sec go by OR the car will remap itself over the next 100klm or as written in manual
THIS should be done after any parts replaced or repairs have been done as the ecu will not igknowlege this untill after this procedure or driving 100klm at wich point a lot of people wonder why its not much different and tinker again only to give change for the ecu to detect I recommend to know the first start procedure as you know the car has new parts from performance and smooth idle MAKE sure to have your coded radio code first you will need to enter this I recommend anyone doing their own work buy a workshop manual like Ellery,s or such you need it even to set idle my 5lt ford you unplug one loom of intake certain size feeler gauge behind adjuster screw set 750rpm when hot then turn off replace plug and done idle set for the ecu to manage
and how to check sensors and sender units
I hope this helps some one even after a dead/ flat battery this will make idle smooth again
Unlikely. A faulty IAC will give you poor, erratic idle speed.
If the 1999 Cadillac Catera idles too fast, the cause could be a faulty idle stop solenoid. It may be damaged or it may have become loose. If it is idling rough or seems erratic, the problem could be a faulty EGR valve. Other problems could be a vacuum hose leak or a clogged PCV valve.
I blown head gasket can cause an engine miss which one cause a rough idle.
No! it only controls the air/fuel mixture at idle - it is by-passed when the engine revs-up. Generally, when there is a problem with the air control valve it causes the idle to become erratic and 'hunt' and maybe the engine keeps stalling.
Yes. IT can make the engine run to rich, and then cause misfires
A faulty camshaft can cause your 1991 Nissan Maxima to idle erratically. A diagnostic test could verify the cause of the improper idling speed.
I would check clutch plate, if faulty renew, the clutch might need adjusting.
A faulty gas cap could cause the check engine light to come on but it would not cause a rough idle or engine noises. Start with having your local auto parts store read the codes. The codes will help determine why the check engine light is on.
Pontiac 1993 vehicles have been known to have Fuel Pressure Regulators that when they fail, they will release too much fuel to the intake and therefore produce erratic or Idle up and down. Also, the erratic Idle can be caused by a air pressure leak located as part of the Emissions system.
No, but something that could cause uneven idle could cause the check engine light to turn on.No, but something that could cause uneven idle could cause the check engine light to turn on.
The idle air control valve controls the neutral idle of the 2001 Honda Accord. A faulty idle control valve leads to an erratic idle. To replace it first locate the valve on the intake manifold. Unplug the unit and remove the three bolts holding it to the manifold.