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Old 08-25-2017, 10:37 AM   Topic Starter
MagicHef MagicHef is offline
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Car Help?
I know there are some knowledgeable car guys on here, and maybe someone can help. My 2001 MR2 Spyder has been running really rough, and I've been running in circles trying to fix it. The previous owner installed an aftermarket turbo with custom headers and exhaust, K&N intake, piggyback ECU, anti-knock system, and higher flow injectors. I've had it for 5 years and it has been working well until recently, so I don't know that the issues are directly related to any of the modifications.

So far I have replaced the fuel pump, fuel filter, fuel pressure regulator, fuel injectors, coils, spark plugs, camshaft sensor, crankshaft sensor, MAF sensor, and O2 sensors.

It was simply running poorly (sounded like it had a dead cylinder) and not throwing codes, but after replacing the camshaft sensor it started giving codes again. Now it gives codes for misfires on all 4 cylinders, plus random misfires, and says the system is too lean.

I am about out of ideas and hoping that I'm overlooking something obvious.
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Old 08-25-2017, 10:38 AM   #2
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Quote:
Originally Posted by MagicHef View Post
I know there are some knowledgeable car guys on here, and maybe someone can help. My 2001 MR2 Spyder has been running really rough, and I've been running in circles trying to fix it. The previous owner installed an aftermarket turbo with custom headers and exhaust, K&N intake, piggyback ECU, anti-knock system, and higher flow injectors. I've had it for 5 years and it has been working well until recently, so I don't know that the issues are directly related to any of the modifications.

So far I have replaced the fuel pump, fuel filter, fuel pressure regulator, fuel injectors, coils, spark plugs, camshaft sensor, crankshaft sensor, MAF sensor, and O2 sensors.

It was simply running poorly (sounded like it had a dead cylinder) and not throwing codes, but after replacing the camshaft sensor it started giving codes again. Now it gives codes for misfires on all 4 cylinders, plus random misfires, and says the system is too lean.

I am about out of ideas and hoping that I'm overlooking something obvious.
Can you post the codes?
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Old 08-25-2017, 10:42 AM   #3
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Originally Posted by Detoxing View Post
Can you post the codes?
Not at the moment, I'm at work and the car is at home.
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Old 08-25-2017, 10:41 AM   #4
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sounds like a big vacuum leak somewhere...
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Old 08-25-2017, 10:43 AM   #5
MagicHef MagicHef is offline
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Originally Posted by JASONSAUTO View Post
sounds like a big vacuum leak somewhere...
Hmm...
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Old 08-25-2017, 10:47 AM   #6
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Originally Posted by JASONSAUTO View Post
sounds like a big vacuum leak somewhere...
This. With all that aftermarket stuff installed, it seems very likely.

Start the engine, get a can of carb cleaner and spray around vacuume lines. If the engine throttle changes, bingo.

If not, EGR/Purge canister maybe?
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Old 08-25-2017, 10:53 AM   #7
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This. With all that aftermarket stuff installed, it seems very likely.

Start the engine, get a can of carb cleaner and spray around vacuume lines. If the engine throttle changes, bingo.

If not, EGR/Purge canister maybe?
Just be careful and don't spray too much. You can start a fire by doing this.






Not that I would know anything about that....nope.....nothing at all. But it did happen to a friend of mine....yea, a friend.
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Old 08-25-2017, 11:17 AM   #8
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Did you do a compression test

A trick i used to use to test the Cat was to remove the O-ring from compression tester and screw it into the cat. I think that normal back pressure was about 10-12psi.
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Old 08-25-2017, 11:26 AM   #9
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Originally Posted by cooper barrett View Post
Did you do a compression test

A trick i used to use to test the Cat was to remove the O-ring from compression tester and screw it into the cat. I think that normal back pressure was about 10-12psi.
I did one a few months ago that came back normal. I was thinking of doing another, but decided against it due to the fact that the issue is affecting all of the cylinders.
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Old 08-25-2017, 12:55 PM   #10
cooper barrett cooper barrett is offline
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I did one a few months ago that came back normal. I was thinking of doing another, but decided against it due to the fact that the issue is affecting all of the cylinders.
Did you do a wet dry compression test Leak down if anything looks iffy..

Since you are thinking T Chain:

You can check chain by pulling V\C and doing 2 things. Rotate the engine to where the 2 timing marks align between the 2 can gears and then align the yellow links to the top. Now look at the yellow links, they should be centered with a slot on right and a dot on left sprocket.
You can now check for tension on the chain between the sprockets and you can also see the the # 1 cylinder should be in TDC (valves closed) Now would be a great time to check valve clearances too.

I doubt you will find anything as Yota chains are bulletproof.
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Old 08-25-2017, 10:45 AM   #11
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Edit: i cant read

Yeah, test the vaccuum. Do you have a hard time holding boost or building up to the proper psi?

Check all of the connectors on the vaccuum lines. They like to break right where the hard plastic nipple meets the bigger plastic part.

You can buy a vaccuum tester for relatively cheap (and it can also be used for removing brake fluid).
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Old 08-25-2017, 10:51 AM   #12
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Old 08-25-2017, 10:51 AM   #13
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Bad distributor?
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Old 08-25-2017, 10:53 AM   #14
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Bad distributor?
Good idea.
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Old 08-25-2017, 10:54 AM   #15
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Bad distributor?
Doesn't have one, coil on plugs.
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