BaD Idle - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

EA90_S · 01-02-2003, 06:11

Today while at the lights everytime the EA would idle form around 900rpm to 100 back and fort and battery light comes on and off. Timing is spot on. so far iam stumped. We tried givin her some stick down a road. fixed it for awhile but nope still the same. I dont like giving my baby stick shes to good haha. tnx guys

AUII_Forte · 01-02-2003, 13:41

Try replacing the MAP sensor. A faulty one will cause a bad idle.

MADNC_8 · 01-03-2003, 03:42

another thing that will cause this is the ISC motor (stands for idle speed control) its located on the throttlebody

i have this problem on my 5litre and its a bloody pain when ya start it and it stalls, start stall.

i have worked out how to drive it like this tho (it aint good for the brakes tho...) when its cold it will do this really bad i have to two-foot it to keep it going i hold it at 1000rpm and its fine when warm it almost always wont do it.

ive been told to take the ISC off and pull it apart, and clean it out with petrol. i just havent had the time to do it yet
i might have a look this weekend

gmanEA · 01-03-2003, 15:39

My Gawd i have the exact same problem.
We replaced:

MAP sensor
Oxygen sensor
Computer
Injectors
Thermostat

I have noticed this is definitely temperature related problem, have you noticed this also ? Also this only began to happen after I got my DEV3, it doesnt always happen but it is very annoying when it does.

carazy · 01-03-2003, 16:27

Timing is never really going to be a problem the EA onwards dizzy can change it's timing +/- 30degrees.
It's most likely your map sensor there found on the firewall on the passanger side there a small box with a wire clip and a vacum hose on them. I had the same problem and my car was pinging a little as well. Brand new genuine ford ones are $160, third party ones are 100 and a second hand one is about $20

EA90_S · 01-04-2003, 07:01

Yep when its hot its does bad idle. a new ISC sensor is $140 from ford expensive. its not good like today i put her into reverse shes a manuel, put clutch in boom shes dies idles around 200 sometimes. So can the ISC thing be cleaned i might have a go at that.

EFJase · 01-04-2003, 18:49

I got same problem. Been told the ISC packs it in intermitently (?spelling), so it can be good for a while (i.e. when a mechanic is looking at it) then turn to poo. Get it pulled apart n cleaned, dunno how much it'll cost to get someone to do, got told it's sort of easy to do. If that doesn't work, grab a new sensor thing.
Bloody anoying but. Specially when i got holden fans along for a ride, even worse if they're chicks, anti ford sayings spew from their mouth

Good luck

EFJase · 01-04-2003, 19:05

Quik question........... is it ok to drive longish distances while this is happening? Wont kill something and leave me stuck somewhere?

FamilyHak_SPak · 01-07-2003, 04:17

Hey I am a newbie, but i actually cleaned the ISC today. Some degreaser and wipe down (instructions off the FordMods site)

FamilyHak_SPak · 01-07-2003, 04:20

... the results were noticeable... just do it on a nice sunny day so u can let the excess fluid evaporate in the sun.

It's just a nuisance coz u have to take the air filter cover off and dismantle it within confined spaces.

But the results are worth it... just takes time.