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| braidy |
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Recently I have found that sometimes my car will rev at around about 2krpm when in neutral and not applying throttle. It usually happens with air con on. Also, with air con on, it will always hang at 2krpm when changing gears (I drive a manual), for about 3 seconds, then drop down.
To add to this, I have noticed that when I turn air con on, the idle speed changes. Now, I know this is meant to happen (correct me if I am wrong), but sometimes it stays the same, sometimes it rises a couple of hundred rpm, sometimes more when switching air con on. Does anyone know what the problem might be? I though the accelerator cable is either dying, or the ICS is screwy. Any thoughts?
_________________ RIP Chelsea |
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| Darkr |
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braidy wrote: To add to this, I have noticed that when I turn air con on, the idle speed changes. Now, I know this is meant to happen (correct me if I am wrong), but sometimes it stays the same, sometimes it rises a couple of hundred rpm, sometimes more when switching air con on.
When you turn the aircon on, you are increasing load on the engine, and in turn the revs will increase, sometimes not by much though. Remember revs alone does not equal the amount of fuel being consumed, it's a combination of revs and engine load. Sorry, I can't help with the rest. |
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| rushed |
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mine does this has done for ages now, wasnt a big issue untill i converted to a manual, no revs flare yp to ~2500 each time i change up gears (after being on throttle) have ruled out ISC, Throttle return spring, sticky throttle, all that is left is the throttle cable and ill be replacing that next payday.
in summery, idd bet accel cable |
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| drft_au |
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try sprayin the the acell cabel with a good silicon based lube and all around the throttle body ......does the rev's pick up more as u turn the air con up ( which is normal) ??
_________________ why go fast in a str8 line .......when ya can slide fast !!!!!!!! |
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| Aaron_EL |
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Did you end up fixing the problem? cause i have got the same problem, but can't find the problem.
It all started when i took the throttle body off, and cleaned it (inc idle speed controller; isc) and put it back together. Symptoms: When the car revs over 2000rpm, on its way down it sticks at 2000 for a few seconds (as mentioned) and then slowly goes down and revs at 1000rpm for a few more seconds than eventually goes down to 770rpm (which is still a bit higher than usual). A couple of weeks ago i performed diagnostics on my car, and found an error code telling me that the throttle sensor had a ground leak, so i played around with it and the error went and the car worked fine up until a few days ago! I just checked the throttle sensor, and it's displying the correct voltages, i.e. no sticking in throttle sensor, or cable! Could it be a leak in the inlet manifold? as i had to take a bolt out of it to get the throttle body out? Any help would be greatly appreciated! Thanks...
_________________ EL Falcon 5sp, body kit, exhaust, trip computer. |
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| braidy |
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Aaron_EL wrote: Did you end up fixing the problem? cause i have got the same problem, but can't find the problem.
It all started when i took the throttle body off, and cleaned it (inc idle speed controller; isc) and put it back together. Symptoms: When the car revs over 2000rpm, on its way down it sticks at 2000 for a few seconds (as mentioned) and then slowly goes down and revs at 1000rpm for a few more seconds than eventually goes down to 770rpm (which is still a bit higher than usual). A couple of weeks ago i performed diagnostics on my car, and found an error code telling me that the throttle sensor had a ground leak, so i played around with it and the error went and the car worked fine up until a few days ago! I just checked the throttle sensor, and it's displying the correct voltages, i.e. no sticking in throttle sensor, or cable! Could it be a leak in the inlet manifold? as i had to take a bolt out of it to get the throttle body out? Any help would be greatly appreciated! Thanks... Money has been an issue in resolving the problem. I have noticed that it only does it when the AC is on now. But I haven't fixed it yet, no. Let me know how you go if you fix it.
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| lee lee le bonk |
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Easy way of detecting if there is a leak somewher in the induction system:
Spray some carbi cleaner where you may think there is a leak. If the revs pick up, you've found the leak.
_________________ Fords Rule. OK. |
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| TROYMAN |
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hi
un plug your isc when the car it idling and if the car stalls or idles around 450 rpm your base idle is correct.. and the whole fast idle issue will be your isc. it either needs to be cleened or replaced. but if it idles any higher than 600rpm with isc is disconected your base idle is to high. |
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| Aaron_EL |
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TROYMAN wrote: hi thanks guys. I'll try the spraying in a moment.
un plug your isc when the car it idling and if the car stalls or idles around 450 rpm your base idle is correct.. and the whole fast idle issue will be your isc. it either needs to be cleened or replaced. but if it idles any higher than 600rpm with isc is disconected your base idle is to high. wrt isc, i tried unplugging the isc, and the revs go down to the normal idle (550-600rpm). So my understanding is that the isc is working however the ecu is giving it the wrong input i.e. ecu sensing something wrong? but i could always be wrong. what do you guys think?
_________________ EL Falcon 5sp, body kit, exhaust, trip computer. |
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| Rick_Deckard |
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TROYMAN wrote: hi
un plug your isc when the car it idling and if the car stalls or idles around 450 rpm your base idle is correct.. and the whole fast idle issue will be your isc. it either needs to be cleened or replaced. but if it idles any higher than 600rpm with isc is disconected your base idle is to high. Hey, I just did that with mine, and the revs dropped and then the car stalled. that mean my ISC is fine? Does that mean other stuff like the ECU is fine too? Cheers.
_________________ E39 523i |
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| Aaron_EL |
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ok, this is driving me insane! spray test didn't work.. taking off the isc and cleaning with crc didn't work. playing around with the angle of the tps (throttle position sensor) didn't work.
tested the idle with isc plug off, it was reving just over 700rpm (on the tacho i.e. didn't test using multimeter). Does that mean i need a new isc? does the isc have any effect on the revs when the engine is warm, i thought its main effect was when the engine is cold?
_________________ EL Falcon 5sp, body kit, exhaust, trip computer. |
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| Aaron_EL |
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FYI: just called up a couple of places; isc for EL $77 from the wrekers, $163 (new none genuine). so it's not a cheap part to test/play with.
_________________ EL Falcon 5sp, body kit, exhaust, trip computer. |
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| Rick_Deckard |
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My runs crapio cold, stutters when you accelerate after just starting, have to give it some, then power comes all of a sudden. Annoying, seeing as the street I turn into can be busy and I'll pull out and the car we barely move for a few moments.
_________________ E39 523i |
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| wicksy |
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after i put 5spd in, my car while randomly rev to bout 2k and sit there even with the air con off, i couldnt care lol
_________________ Now i have a EF XR8 5spd.........mmmmmm 5L |
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| Aaron_EL |
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Till_Lind; from what i have read in the forums and what i experienced persoanlly, you might need to clean your isc. I had the same problem, so i cleaned the isc and it was running beatifully, until... i took off the throttle body to clean it! and now the problems begin...
_________________ EL Falcon 5sp, body kit, exhaust, trip computer. |
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