06 Corolla revving too high

daveevo8

Hi could do with some help. Parents have 06 1.4vvti corolla with 86000kms regularly serviced about the last 6 months when started up revs to 1400 and stays there sometimes it climbs to 1600 than drops back down again to 1400. The throttle body was first cleaned but this didnt help so they replaced the throttle body and ivac controller this still has not fixed the problem. Anyone else have similar problems or hear of hoe this problem was fixed, any advice would be great as it's starting to get expensive on tthem. Thanks in advance

homewardbound11

daveevo8 wrote: »

Hi could do with some help. Parents have 06 1.4vvti corolla with 86000kms regularly serviced about the last 6 months when started up revs to 1400 and stays there sometimes it climbs to 1600 than drops back down again to 1400. The throttle body was first cleaned but this didnt help so they replaced the throttle body and ivac controller this still has not fixed the problem. Anyone else have similar problems or hear of hoe this problem was fixed, any advice would be great as it's starting to get expensive on tthem. Thanks in advance

Isn't there a vacuum sensor on the air intake that controls the idling revs • try disconnecting it.

daveevo8

homewardbound11 wrote: »

Isn't there a vacuum sensor on the air intake that controls the idling revs • try disconnecting it.

Have that removed it has brought on the engine management llight but does not drop the revs. Had it on a dignosti the other day before removimg the sensor and is showing no faults. Was told could be ecu? Or maybe the gasket around the manifold?

colm_mcm

You need to drive the balls out of it.
Corollas do this apparently to rid the exhaust of moisture or something odd like that. That's what toyota told us when we were selling them new.

This would be revs fluctuating from 1200-1400rpm.

daveevo8

colm_mcm wrote: »

You need to drive the balls out of it.
Corollas do this apparently to rid the exhaust of moisture or something odd like that. That's what toyota told us when we were selling them new.

This would be revs fluctuating from 1200-1400rpm.

Oh really i must take it out for a blast tomorrow what we talking about third gear at 50mph or is it more motorway speeds for a certain distance?

colm_mcm

Accelerating hard in low gears, plenty revs.

It may not be it but that happened a few back when they were a current model.

daveevo8

colm_mcm wrote: »

Accelerating hard in low gears, plenty revs.

It may not be it but that happened a few back when they were a current model.

No bother ill try it c if it helps no harm in it. Any other ideas if that aint it? Or is it another trip to toyota

daveevo8

colm_mcm wrote: »

Accelerating hard in low gears, plenty revs.

It may not be it but that happened a few back when they were a current model.

Yea did that and still same problem

dooroy

I changed the engine in my niece's 2003 Avensis 1.6 VVti a few months back. The car was parked up for a while waiting for an engine and when I put it back on the road the idle was way too high .( The 1.4/1.6/1.8 are all similar apparently ).
I rang a friend of mine in the trade and he said it was common enough . He told me to check out a part which was attached to but not part of the throttle body as it could have seized (due to the car being idle for some time ).
It was a bit fiddly but sure enough it had become very stiff in operation and when freed out problem was solved .
I have been trying to find it on the internet but no joy so far - its on/below the throttle body . If I can contact him I will try to find out.
I notice you changed an ivac unit - maybe thats what i'm on about , if so my idea out the window .
A lot of posts mention vacuum leaks etc but I'd say all pipes/connections etc have been well checked out.

dieselbug

It would be interesting to see what the throttle position is showing in live data at idle. IE is it being driven or caused by an external fault like a leak.

Saw one before that had a battery disconnect and caused a false reading from the throttle potentiometer after reconnecting.

Should'nt be too difficult to diagnose.

I wonder did someone adjust the rest position before changeing the iac valve and leave it that way.

Was it a Toyota main dealer that fitted the new throttle body and iac valve?

daveevo8

dieselbug wrote: »

It would be interesting to see what the throttle position is showing in live data at idle. IE is it being driven or caused by an external fault like a leak.

Saw one before that had a battery disconnect and caused a false reading from the throttle potentiometer after reconnecting.

Should'nt be too difficult to diagnose.

I wonder did someone adjust the rest position before changeing the iac valve and leave it that way.

Was it a Toyota main dealer that fitted the new throttle body and iac valve?

Hi no it was an independent mechanic who did it, so unsure. But it was doing it prior to the throttle and ivac been replaced he thinks its ecu but seems bit drastic considering no faults can be found when plugged in. Surely the ecu would store some sort of code if it was that?

dieselbug

daveevo8 wrote: »

Hi no it was an independent mechanic who did it, so unsure. But it was doing it prior to the throttle and ivac been replaced he thinks its ecu but seems bit drastic considering no faults can be found when plugged in. Surely the ecu would store some sort of code if it was that?

Condemming the ecu is a drastic step without ruling out all the other possibilities first.

Were the replacement throttle body and iac valve brand new or used parts.

daveevo8

dieselbug wrote: »

Condemming the ecu is a drastic step without ruling out all the other possibilities first.

Were the replacement throttle body and iac valve brand new or used parts.

Used due to the fact toyota wanted 350 + vat for ivac controller alone

joujoujou

dooroy wrote: »

[...]
I have been trying to find it on the internet but no joy so far - its on/below the throttle body . [...]

I guess you mean Idle Speed Control Valve.

[post]93091972[/post]

dooroy

Yep thats it .
I see it mentioned in that post that the car being left unused for a while can cause it to become stuck .
That was what happened in my case as car was parked up for about 3 months waiting for an engine.
Once freed out it worked perfectly and has continued to do so since.
I presumed OP fitted a new one - if not it could be still a problem.

daveevo8

dooroy wrote: »

Yep thats it .
I see it mentioned in that post that the car being left unused for a while can cause it to become stuck .
That was what happened in my case as car was parked up for about 3 months waiting for an engine.
Once freed out it worked perfectly and has continued to do so since.
I presumed OP fitted a new one - if not it could be still a problem.

Diselbug is going to take a look at the car so hopefully he can maybe spot the problem thanks for all the comments so far

dunner515

daveevo8 wrote: »

Diselbug is going to take a look at the car so hopefully he can maybe spot the problem thanks for all the comments so far

If you find out what the issue is would you mind telling us what it was as I am having a similar issue

daveevo8

dunner515 wrote: »

If you find out what the issue is would you mind telling us what it was as I am having a similar issue

Yea will do. What have you done to yours so far?