CEL light when warming up: 3vzfe

[Rob_0126]

Need some help with this please. Car has been doing this ever since I got it.
-When the car is cold, and you drive it, the check engine light comes on. The engine bogs on part throttle or more.

It never throws a code.

So, what causes a check engine light, but doesn't record a code?

Ive unplugged the vacuum to the egr valve and egr modulator, so the egr isn't boggin it. Ive tested the egr by putting vacuum to it, and it works properly.

-AFTER it warms up, and i turn the car off to clear the CEL, it runs fine. It has the right pickup and it doesn't bog.

What gives with this thing?

BTW: The IAC valve has been cleaned and lubed, I do get the idle dive half the time. It comes at the point just before you stop (1 mph-0 mph), the idle dives to 500 rpms sometimes, then gradually works it way back up to proper idle, over 5 seconds.

[new echo owner]

When the CEL is on, don't turn the car off, see if you can pull a code then.

N.E.O.

[Rob_0126]

Originally Posted by new echo owner

When the CEL is on, don't turn the car off, see if you can pull a code then.

N.E.O.

I don't have a scan tool. I do the ignition, cel light blinking method.

[new echo owner]

Originally Posted by Rob_0126

I don't have a scan tool. I do the ignition, cel light blinking method.

What years is you car? Unless it is a 95' or later, you don't need a scan tool.

N.E.O.

[xtremeskier97]

Originally Posted by new echo owner

What years is you car? Unless it is a 95' or later, you don't need a scan tool.

N.E.O.

It's a 3vz-fe, so it's a 92 or 93.

[Rob_0126]

Whats the procedure to obtain the code since it clears after the key is turned off?

I tried to just turn to accessories after turning engine off, didn't work, just a 55 code.

Do I do the te to e jumper while it's running?

Robert

[new echo owner]

Originally Posted by Rob_0126

Whats the procedure to obtain the code since it clears after the key is turned off?

I tried to just turn to accessories after turning engine off, didn't work, just a 55 code.

Do I do the te to e jumper while it's running?

Robert

Correct!

One rare possibility why you can't retrieve a code with a CEL maybe that your ECU is resetting itself every time you turn the key off, kind of like pulling the EFI fuse every time. If you still can't retrieve a code with the CEL on and engine running, check all the power feed to the ECU. If the power feed are good, then you may have an internal open circuit inside the ECU.

N.E.O.

[new echo owner]

Originally Posted by xtremeskier97

It's a 3vz-fe, so it's a 92 or 93.

I thought so, but I was too busy to verify that, so I just asked him!

N.E.O.

[Rob_0126]

Well, I got a CEL light as usual. popped the hood and jumped it, still no code.

What is the deal?

btw, how do I check the ECU, and where is it?

[new echo owner]

Was the CEL blinking when you jump the terminals? The ECU is behind the glove box.

N.E.O.

[Rob_0126]

Originally Posted by new echo owner

Was the CEL blinking when you jump the terminals? The ECU is behind the glove box.

N.E.O.

Yeh, it blinked the all clear code 55.

[new echo owner]

Code 55 is right bank knock sensor problem; if there is no code, it will just continue to blink.

N.E.O.

[Rob_0126]

Originally Posted by new echo owner

Code 55 is right bank knock sensor problem; if there is no code, it will just continue to blink.

N.E.O.

Oh, Ive had that code for a long time. Where would the list for codes be for my 92?

So if the knock sensor is acting up, that would be why the computer is retarding the timing?

Would you happen to know where that knock sensor is located on the right bank?

thanks much!

Robert

[new echo owner]

There are two knock sensors for 3vzfe, they are both under the intake manifold in the galley between the heads. And yes, a knock sensor problem would affect the timing.

I am no sure where would be a good place to find the codes for your car, I just happen to know what some of them are. Maybe one of the other members may have the list handy.

N.E.O.

[Rob_0126]

Originally Posted by new echo owner

There are two knock sensors for 3vzfe, they are both under the intake manifold in the galley between the heads. And yes, a knock sensor problem would affect the timing.

I am no sure where would be a good place to find the codes for your car, I just happen to know what some of them are. Maybe one of the other members may have the list handy.

N.E.O.

So I guess age would cause a knock sensor to go bad?

Are they easy to pull without removing the intake plenum?

They cost a fortune($130), so would you suggest a junk yard looksee?

thanks a bunch for the help.

Robert