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Guest daddydise

Brand New Battery But It Died Again

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Nothing that high - unless the ambient temps are very low. In 80 degree weather - might be around 1000-1200 RPMs for only 10 seconds or so - then drop down. Might be because of my automatic transaxle - so mine may not be identical to your case.

 

But for even a couple of minutes - that is quite unusual. Sounds like there is a vacuum leak somewhere else. Leak at that part of the airbox shouldn't cause this sort of issue - as the MAF is set past that. It is not getting unmetered air into the system.

 

If you pulled the whole intake system off and replaced with an aftermarket - maybe that will do something different. Different location for the MAF - tube diameter is different, so it is not metering the air correctly.

 

Might be worthwhile to reset the ECM and see if it was a funky setting in the ECM - wrong fuel trim, etc.

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OBD-II Scanner, pull EFI fuse under the hood, or pull the negative terminal off the battery for minute (this method assumes that you don't have anti-theft, as the alarm system will hate this)

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Anything between throttle body and cylinder head, and anything connected to anything between throttle body and cylinder head.

Edited by dom

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Do you have any photos/illustrations that can guide me? Where is the cylinder head? I know the throttle body is after the air filter box. Any wiring connections I should be aware of? I really have looked over for 15 minutes now. . .

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Intake manifold gasket sits on cylinder head. It tends to leak on 9th gen Corolla, which is replaced with revised orange silicone gasket # 17171-22060... Vacuum leak can be there, in intake manifold, between manifold and thrrottle body, on throttle body (downstream of throttle valve where vacuum exists), or any channel (vacuum and PCV hoses) between throttle valve and cylinder head.

Edited by dom

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The 8th gen have a metal tubular intake - so it doesn't have the warping issue that some of the composite intakes on the 9th gen have. But the hoses connecting to the throttle body, brake booster hose, EVAP, etc. are all fair game.

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So, the intake manifold connects to big rubber hose that exits the air filter box? I took the VVT-I cover off and, with engine idling (at 1,200 RPM after a few minutes on a 73-degree day), checked around in the vicinity of vacuum hoses, including the PCV area and EVAP hoses. Didn't hear any hissing sounds. I rocked the air filter box as the intake to the box (as fish may recall) doesn't sit flush. So, I forced it flush, but fish is correct it would have no bearing on idle quality.

Here are some photos, really explaining nothing except for the one with hose disconnected. In regard to cleaning the throttle body, can I spray carb cleaner into this hole? And, where is the brake booster hose?

I want to replace the hose that connects to the PCV just because I found a nicer one at the yard, but it looks like the best way to get to it is removing that coolant hose. I ordered Toyota red on eBay for $31 w/shipping and it should arrive later this week. I thought I would just take that hose off when doing the coolant change.

Does it have to be a hose that's causing this problem?

001_zpsb17104e6.jpg
002_zpsa6d98a38.jpg

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Intake manifold connects to throttle body, with a gasket in between... Your intake manifold gasket between intake manifold and cylinder head (engine) could well be where you have a vacuum leak, if any. Don't expect to be able to hear a vacuum leak induced hissing sound with the engine running over normal intake rushing air noise.

 

By the way, I just have to ask... Why do you call yourself 'autotech...' ?

Edited by dom

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Fun is good. Easy is good. Have other Corolla owners experienced this gasket as failing/leaking requiring its replacement? Common cause of higher idle?

 

How long did it take you? Did it solve the problem if you had it? I did help replace intake gasket in a '98 Metro three-cylinder, but I "helped" (supervised) and it was three years ago.

Edited by autotech2612

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Intake manifold gasket vacuum leak is a common problem with 9th gen Corolla's original black nitrile gasket with its composite manifold, but a vacuum leak there results in the same idle hunting problems and lean code P0171. The revised 9th gen orange silicone gasket completely cures the problem.

 

Vacuum leak could also be at fuel injectors' O-rings or throttle body gasket... There are endless 8th gen Corolla discussions on looking for the cause of very common lean condition which does raise idle rpm, and P0171 lean code. MAF sensor is often blamed, but the real cause never seems to be found... I wonder if there's a hidden vacuum leak within the intake manifold itself. Maybe the intake manifold plenums welds are cracking, or a pressed section's seam lost its proper seal over numerous heat cycles? Perhaps a 9th gen composite manifold could fix it.

 

http://www.toyotanation.com/forum/131-8th-generation-1998-2002/319797-p0171-system-too-lean-bank-1-a.html

 

http://www.toyotanation.com/forum/131-8th-generation-1998-2002/420555-p0171-help-bank-one-lean.html

 

 

9th gen intake manifold (includes both gaskets): http://www.rockauto.com/catalog/x,carcode,1432915,parttype,5536

 

By the way, VICTOR REINZ # MS19590 is exactly the same as Toyota's revised # 17171-22060:

http://www.rockauto.com/catalog/x,carcode,1432915,parttype,5424

Edited by dom

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All right, please afford me at least two days to digest this and do some further exploration under the hood. Just know I do follow through with what you and Fish recommend to me. I appreciate it.

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