Its like the accelerator is stuck... - Toyota Nation Forum : Toyota Car and Truck Forums

agenericname · 04-10-2011, 11:54 AM

Hi,

My 1993 4 cyl Camry has had the low engine oil pressure light come on a few times while at idol.

While driving to work the other morning it was like the accelerator was stuck on. When I hit the clutch the revs would instantly jump up to 4000rpm. So I had to drive it in high gear and turn it off at traffic lights.

I left it a couple of days and it is still reving high when I turn it on.

Can anybody help me out? Whats happening?

Thanks.

***JohnGD*** · 04-10-2011, 12:29 PM

Some causes are stuck accelerator cable, throttle plate and possibly idle air control valve, but I don't think IAC alone can take it to 4000 rpms.

Check the throttle and see if the throttle plate is stuck open. Try removing the accelerator cable too and see if the throttle plate returns to the closed position. etc.

Here is an excellent example of how to clean the iac. Completely disassembling it is the preferred way to clean.
5sfe IAC Removal (lots of pictures)

The first picture here shows an almost completely closed throttle plate. I say almost because the throttle opener will prop it open a little bit.
DIY removal & cleaning of IAC

Quote:

Originally Posted by agenericname

Hi,

My 1993 4 cyl Camry has had the low engine oil pressure light come on a few times while at idol.

While driving to work the other morning it was like the accelerator was stuck on. When I hit the clutch the revs would instantly jump up to 4000rpm. So I had to drive it in high gear and turn it off at traffic lights.

I left it a couple of days and it is still reving high when I turn it on.

Can anybody help me out? Whats happening?

Thanks.

agenericname · 04-10-2011, 12:36 PM

hmmm. It looks to me like the the throttle plate is free and not stuck, I took the air hose off and had a look inside. I did notice a small amount of oil in there.

There is no tension in the cable either.

Ill check out the threads you posted.

Thanks man!

***JohnGD*** · 04-10-2011, 01:12 PM

If the throttle plate can move freely (as you move the spring lever or whatever your call it), then it's probably fine. If there is oil in there then check your PCV system. Maybe it's a bad hose allowing air leaks. Major air leaks in this case.

Again, I don't think IAC alone can take it to 4000 rpms, but it can use a cleaning after a few years.

I'd look at air leaks next.

Quote:

Originally Posted by agenericname

hmmm. It looks to me like the the throttle plate is free and not stuck, I took the air hose off and had a look inside. I did notice a small amount of oil in there.

There is no tension in the cable either.

Ill check out the threads you posted.

Thanks man!

Oceans · 04-10-2011, 04:51 PM

Pull the cover off and check there for cables sticking.. as your cables go to that first if I recall correctly and then back to the throttle plate.

After cleaning my intake I had a problem not as extreme as yours, but that was where my culprit lay in hiding .

First image is of the whole thing, second is of the cable and wheel that gave me my problem.

Uploaded with ImageShack.us

agenericname · 04-12-2011, 11:37 PM

Ok so,

It was sitting at work for three days then I decided to drive it home today.

Turn it on....3200 RPM at idol, I checked under the bonnet and their was no tension in the accelerator cable at all.

Drove it for about 10 min....4000 RPM at idol.

After 20 min or so it got "unstuck" and drove normally but at idol the RPM fluctuated between 1000RPM and 2000RPM....it was like reving by itself.

Could it be the oxygen sensor?

Could low engine oil pressure have anything to do with it?

Thanks for the help!!

***JohnGD*** · 04-13-2011, 12:53 AM

Take a piece of tape and tape over the IAC opening at the bottom of the throttle body, right in front of the butterfly valve. You will need to manually open the throttle or the engine will stall. See if it fluctuates. If it no longer does that then it's the IAC.

(Use a long piece of electrical tape all the way to outside the throttle body to make sure it doesn't fall off and get sucked into the cylinders!)

Quote:

Originally Posted by agenericname

Ok so,

It was sitting at work for three days then I decided to drive it home today.

Turn it on....3200 RPM at idol, I checked under the bonnet and their was no tension in the accelerator cable at all.

Drove it for about 10 min....4000 RPM at idol.

After 20 min or so it got "unstuck" and drove normally but at idol the RPM fluctuated between 1000RPM and 2000RPM....it was like reving by itself.

Could it be the oxygen sensor?

Could low engine oil pressure have anything to do with it?

Thanks for the help!!

ghettosled · 04-13-2011, 07:35 AM

yeah, since the throttle cable and butterfly valve are functioning as they should, it certainly sounds like a gross vacuum leak to the intake manifold.

Oceans · 04-13-2011, 09:18 AM

I would definitely have to agree with the rest with the idle flucuating like that, there is a vacumn leak some where. One way that can help you check is using a can of starter fluid if its not readily seen. Spray around the lines when the car is idle and see if the idle goes higher.

When you find a spot that does, start looking there.

agenericname · 04-17-2011, 06:04 PM

Thanks a lot for the advice,

John, I dont really know where the ICV is...are there any pictures on the net of it?

I dont have the tools yet to clean the ICV out properly so I took the air hose off and sprayed cleaner down the hole....It might have worked a bit....

Before I did anything I turned the car on and it was reving a constant 1600RPM.

Turned it off and sprayed the ICV....turned it on and it slowly reduced to 1100RPM on idol, over 7 min or so. Im not sure if the spray worked or if it was just the car warming up.

I sprayed all around the intake manifold to check for air leaks and didnt find anything.

Just took it for a spin and it seemed ok, always returning to 1100RPM at idol.

Thoughts?