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Guest daddydise

Brand New Battery But It Died Again

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Failing injectors were also known to cause issues with the 8th gen Corollas. I haven't really heard of an intake manifold failing on an 8th gen - though it is entirely possible. Be easy enough to check and mark that off your list.

 

I know that a number of people have modified the 8th gen with a composite intake from the 9th gen. They fit without issue and give you a little bump in the higher RPM range (shorter intake runners, less thermal conductivity). You'll lose some in the low end, but most would gladly trade that for more juice in the high end. Not sure what it will do to your overall MPG. Might be something to think about down the road as a future project.

When I swapped in the composite intake from a Celica some years ago - there was no apparent change, but the throttle response was improved. Might be due to having a slushbox transaxle sucking too much of the power. Unfortunately, that intake is long gone, as I entertained the idea of running boost. Might try again - the issue now is free time to play around with the car.

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A dirty and/or sticking idle air control valve on throttle body can also cause high idle.

 

Does you check engine light go on for lean code P0171 at all? Have you ever replaced your exhaust manifold's 'donut' flange gasket?

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Where is the idle air control valve, still can't find it. Can you provide a photo?

 

CEL does not light up for a P0171. I have two codes (EVAPs) currently: :P0441 and P0446.

 

The exhaust manifold's donut gasket? I have no idea if it has ever been replaced. I got the car at 214,000 and there are records for oil changes and tires, but that's it. I wish I knew the previous owner. The exhaust system is solid condition right now and has no leaks. Very quiet.

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Failing injectors were also known to cause issues with the 8th gen Corollas. I haven't really heard of an intake manifold failing on an 8th gen - though it is entirely possible. Be easy enough to check and mark that off your list.

 

I know that a number of people have modified the 8th gen with a composite intake from the 9th gen. They fit without issue and give you a little bump in the higher RPM range (shorter intake runners, less thermal conductivity). You'll lose some in the low end, but most would gladly trade that for more juice in the high end. Not sure what it will do to your overall MPG. Might be something to think about down the road as a future project.

 

When I swapped in the composite intake from a Celica some years ago - there was no apparent change, but the throttle response was improved. Might be due to having a slushbox transaxle sucking too much of the power. Unfortunately, that intake is long gone, as I entertained the idea of running boost. Might try again - the issue now is free time to play around with the car.

 

 

How would I know if I have a failing injector?

 

Last night the ambient temperature when I left was 52 degrees. I idled at 1,500 RPM in the driveway for a minute, then around the block when I got to that stoplight again (waited two minutes again), I was in neutral and it gradually went down to 1200 RPM just before I accelerated.

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Try unplugging the injectors one at a time while idling the engine. The injectors that cause the least amount of idle instability are likely the suspect "dying" injectors.

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I haven't gotten around to this issue yet. Been distracted with a few things, thus, I haven't been posting as much on the Forum. . .

 

Car goes in Monday morning for the clutch replacement. My mechanic is having NAPA resurface the flywheel, but sometimes turnaround time on that can be up to three days, depending on NAPA's workload. I told him there's no rush.

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Back to finding the vacuum leak or whatever is causing the high idle. Fish, did you say to ignore the manifold area? I was thinking about replacing the gasket. Below are three photos of bolts to be removed to do this. Do I have to remove the fuel rail too? Does the manifold just back off a little, just enough so I can put a new gasket on? Etc...

 

 

001_zpsf2e65908.jpg

 

002_zpsc8848857.jpg

 

003_zps097c11d0.jpg

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Bad intake gasket usually is confined to the 9th gen Corollas (composite intake manifold), but if you already have a gasket or can source one pretty inexpensively - doesn't hurt to replace the one you have. Might help out in your case, as you've looked pretty much everywhere else. Just keep the original, just in case the new gasket makes it worse. As for the bolts, those should be it - might have to loosen some other ancillary stuff to get clearance to pull the manifold. Might take some persuading with a mallet, as those through studs could be stuff with corrosion.

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