Gen 1.5 w/ 2AZFE - Does it have an EGR? (Updated 4/14)

by **chrono807** » Mon Mar 03, 2008 7:27 pm

When I had my 1997 Camry with the 5SFE, I had a weird issue where the car's RPMs would drop dramatically when I took my foot off the gas, then it would recover. It finally got to the point where the car would occasionally stall, and Toyota ended up replacing my EGR.

Now I have a 2003 Solara with the 2AZFE and it's doing the same thing - the best way to reproduce the symptoms is to turn on cruise control on flat terrain headed towards a downhill. When the car reaches the point where it no longer needs the engine to work to maintain speed, the RPMs drop to the point where I can feel the car lagging, then they go back up to the RPMs I'd normally expect. Sounds just like my 1997 Camry, but I don't even see an EGR listed on Advance's site. Does this car even have one? I'm subscribed to AllDataDIY and it doesn't say anything about an EGR either.

What could be causing this on a 2AZ?

by **1gSE** » Mon Mar 03, 2008 8:15 pm

CEL? does it surge at idle? running extremely rich?

by **krawzyazn** » Mon Mar 03, 2008 8:45 pm

Get your TB cleaned or your injectors

by **chrom3titan** » Tue Mar 04, 2008 2:43 am

1gSE wrote:CEL? does it surge at idle? running extremely rich?

actually my car does that

by **1gSE** » Tue Mar 04, 2008 5:26 am

it's probably stuck open. Mine did it a few weeks ago. Had me stumped. My CEL was egr excessive flow or something like that. I went through a tank of gas literally in about 3 days. Even going back and forth between base and town, it should have last at least a week and a half....then it hit me! excessive flow...must be stuck open (i had a 3 day brain cramp haha) i pulled the vacuum line off and it instantly ran fine. So i drive like that until i decide to spend the money on a new one (puts on flame suit just in case)

by **chrono807** » Thu Mar 06, 2008 12:21 pm

Could you describe more about the car being stuck open... you referring to the throttle? I'm a little confused, although I was going to clean my TB and MAF this weekend if the weather is nice.

by **synenergy52** » Fri Mar 07, 2008 8:40 am

He means the EGR valve was stuck open so he pulled the line off of it as a temporary fix.

by **chrono807** » Sat Mar 15, 2008 6:07 am

synenergy52 wrote:He means the EGR valve was stuck open so he pulled the line off of it as a temporary fix.

Now his car has the 1MZ, does the 2AZ have an EGR?

by **chrono807** » Sun Apr 13, 2008 9:25 am

chrono807 wrote:
synenergy52 wrote:He means the EGR valve was stuck open so he pulled the line off of it as a temporary fix.

Now his car has the 1MZ, does the 2AZ have an EGR?

Okay, the saga continues. So I've found out that VVT-i engines don't have an EGR.

I brought the car to my usual shop (who's serviced the car since the day I bought it, and the GM has a Toyota herself so she knows the importance of using the genuine fluids, etc). They took the car out for a ride, and they said they actually noticed the transmission slipping and that's what's causing the other issue I described.

Two different Toyota dealers in my area completely deny that there's ANY issue - that is, they don't notice any slipping in the transmission, and they don't notice the "stumbling" I described. I even went out for a test drive with both dealers and showed them the issue I originally had, and they still denied noticing anything.

What do I do from here? Is this one of those situations where I have to just drive the car a little harder than usual so the problem gets worse? I have 18K left on my certified vehicle warranty.

by **Eye8Pussies** » Sun Apr 13, 2008 7:45 pm

sounds like your iac valve

the 2003 2az solara isn't drive by wire, right?

by **chrono807** » Mon Apr 14, 2008 5:17 am

Eye8Pussies wrote:sounds like your iac valve

the 2003 2az solara isn't drive by wire, right?

I believe it's drive-by-wire... the throttle body has a wiring harness plugged into the side, not a throttle cable.

I'll look through the forums for any IAC valve DIY's and report back. Does it sound like it's dirty or dying completely?

by **Eye8Pussies** » Mon Apr 14, 2008 10:01 am

it could be dirty, but sounds more like it's dying of that it can't deal with the heat

after I installed my supercharger, I had similar problems- one, because I got extra parasitic drag during idle /non-throttle conditions, and two, because more heat was created within the engine bay, which makes it hard for the iac to properly compensate under all conditions for a proper idle

in my case, I was able to adjust the base idle on my gen3. in the case of the gen4s, the idle up/down is controlled more by the ecu.

in your case, I would also presume that it's controlled more by the ecu, but there still could be a manual adjustment for it. if not, and it quite possibly means you may need a new iac.

the best way to find out would be if you could find somebody else with the same car/engien and swap it out just to see if it makes a difference....

by **chrono807** » Mon Apr 14, 2008 10:57 am

Eye8Pussies wrote:it could be dirty, but sounds more like it's dying of that it can't deal with the heat

after I installed my supercharger, I had similar problems- one, because I got extra parasitic drag during idle /non-throttle conditions, and two, because more heat was created within the engine bay, which makes it hard for the iac to properly compensate under all conditions for a proper idle

in my case, I was able to adjust the base idle on my gen3. in the case of the gen4s, the idle up/down is controlled more by the ecu.

in your case, I would also presume that it's controlled more by the ecu, but there still could be a manual adjustment for it. if not, and it quite possibly means you may need a new iac.

the best way to find out would be if you could find somebody else with the same car/engien and swap it out just to see if it makes a difference....

Guess I'll have to look around for a 2AZ IAC valve. Now, does anyone know why I hit a puddle the other day and for about 20 seconds the car literally felt like it was going to fall apart? It was a tiny puddle, small enough that I could barely even feel the car pulling to the right (only the right wheels hit it).

Gen 1.5 w/ 2AZFE - Does it have an EGR? (Updated 4/14)

Gen 1.5 w/ 2AZFE - Does it have an EGR? (Updated 4/14)

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