Forced Induction Superchargers | Turbochargers | Intercoolers

One Cylinder Lean

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Old May 28, 2016 | 07:50 AM
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Default One Cylinder Lean

Have just got car running and have made a couple of test runs on back roads and I have one cylinder #5 that is lean. All the others have perfect color on them. I am using a microsquirt with gt45 and 80 lb injectors. I checked compression and all were the same. Rockers are fine pushrods good. What could cause this. No apparent vacuum leak on that cylinder on intake. Could it be one injector is not working right. Any help appreciated.
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Old May 28, 2016 | 07:54 AM
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Could be a vacuum leak. Move the injector to another cylinder and retry. If the lean condition moves with the injector, it's an injector issue. If not, pull the intake and look at the gasket real close.
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Old May 28, 2016 | 08:13 AM
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^^^ That.
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Old May 28, 2016 | 02:00 PM
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That is what I had planned just thought could be something else. Thanks
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Old May 28, 2016 | 04:02 PM
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Why do you say one is lean
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Old May 28, 2016 | 06:53 PM
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Based on what he said, I am thinking he is reading plugs.

OP, are the injectors new?
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Old May 28, 2016 | 07:07 PM
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Didn't see where he says color. Post pics of plugs
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Old May 28, 2016 | 08:56 PM
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Yes injectors are new. Have read plugs for years racing and these plugs have nice color and marking on electrodes. This is first ls turbo motor and just looking to see if any different idea on lean one since microsquirt is batch instead of sequential fire. Still open to ideas as I am going to try injector swap tomorrow to other cylinder with different plugs to get good reading on new ones to compare.
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Old May 30, 2016 | 03:40 AM
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Injector swap would be easiest first port of call.
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