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steveplatt28 12-11-2012 07:15 AM

Revs staying high before idling correctly.
Hi, hope someone can help me out. car has been running fine up until this morning. went to restart the car having already travelled 3 miles then leaving it for 10mins or so. Straight away noticed the engine light was on and it was running what i would call juddery. managed to get home and check out the problem online and took a punt at the coil pack as my local auto supplies had one v cheap. Fitted part and started up, car runs perfect except for engine light still on and the revs stay at about 1100rpm for 5 secs before settling to normal.

thought it was strange that both problems occured at he same time and is it possible the coil pack going has knocked something else out?

Would also like to comment at how amazing all the members are at helping out by continuously posting new ideas.[:)]

Any help would be greatly appreciated

Cheers steve

02fordsvt 12-11-2012 07:53 AM

I can't help you much with your problem, but I will suggest you get your check engine light codes read so you have a better idea what's wrong. I don't know about in the UK, but some parts store chains in the US read the codes for you free so it may be something worth checking out before you start tearing things apart on your car.

steveplatt28 12-11-2012 08:05 AM

hi, not heard of free code reading over here but would be worth asking.

Thanks for reply[:)]

ErikJames04SVT 12-11-2012 12:17 PM

I am having a similar issue with my 04' SVTF. Sometimes the things acts like the cruise control is on. I start it and it jumps up to 2500 or 3k rpms. othertimes it just idles a little high 1500rpms but there is no check engine light and its not throwing any codes. Keep updating this thread with what you find and i'll do the same if i find something.

6SPD_soul 12-11-2012 02:06 PM

Steveplatt, if you hold in the odometer reset button while starting the car it will go into "test mode" and this will display current DTCs, among other things. That's the gist of it, but you can search for more info here, google, youtube. I think you should make sure your wires and plugs are up to snuff also, you could have high resistance in a wire that klled the previous coil, the new one might handle it for awhile but will kill the new one too if this is the case.

ErikJames, you should look around here for info on the Idle Air Control valve (or IAC), it's a solenoid responsible for maintaining off throttle engine idle, and they are known to stick and cause problems like you're describing. They can be cleaned or replaced, if you want to replace it I've used a Hitachi one in the past that was about $60 and works fine, much cheaper than OEM. Search for "IAC cleaning how to" or something to that effect, it's an informative thread.

steveplatt28 12-12-2012 07:48 AM

drove the car yesterday still with the warning light on and after leaving overnight and starting this morning it is running perfect and the warning light has gone out. not sure how this has come about but the car has been started and stopped quite a few times already today and so far so good. will keep fingers crossed.

was wondering weather the coil pack threw the ecu when it went and it maybe re adjusted when the new one fitted???

cheers for all the replies[thumb]

steveplatt28 12-12-2012 07:52 AM

cheers 6SPD_soul, will try that even though it seems to be ok for now as the car is over 10 years old now so it must be a bit gunked up!

amc49 12-12-2012 11:19 PM

Old IAC problems can come and go............

postfranksa 12-13-2012 01:19 AM

yeah, will try that even though it seems to be ok for now as the car is over 10 years old now so it must be a bit gunked up!

steveplatt28 12-13-2012 04:33 AM

Not so great
started fine this morning but when stopped and restarted again same problem back again. have replaced ht leads to no avail. think gonna have to get it put on diagnostics reader. also took off idle control valve to clean but it looked quite clean anyway. does anybody think that is worth changing before i get diagnostics done?

Cheers Setve[gunfire]

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