Spark Plugs a little on the white side? - Civinfo
 
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post #1 of 5 (permalink) Old 27th May 2019, 21:48 Thread Starter
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Spark Plugs a little on the white side?

Trying to locate the reason for my car being about 10% down on power so I took the plugs out. They are fairly white which indicates the engine running too hot or too lean. Is it worth me changing to a different heat range?
Anything else I could investigate if it's running too hot?
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post #2 of 5 (permalink) Old 28th May 2019, 08:21
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Does your car output fuel trims via the obd port?

You may have a slight vacuum leak somewhere in the inlet, hoses?

Is your fuel system operating okay?

Perform an injector flow test?
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post #3 of 5 (permalink) Old 28th May 2019, 10:01 Thread Starter
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I'm going to have to Google some of that Farqs
Funnily enough the hose that runs from the iacv to the inlet manifold was a little easy to remove. I put a small hose clip on it, did an ECU relearn and put a velocity stack on, the car really pulled well this morning. The car could have been running lean prior to my remap, that's something I should consider. Might look up the injector test, mine sound noisy.
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post #4 of 5 (permalink) Old 28th May 2019, 10:19
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Hehe, fuel trims and logging can be a useful diagnostic tool to narrow down likely causes.

A vacuum leak is probably the most likely, are the injector seals okay?

Then injector flow and leak back tests would be helpful.
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post #5 of 5 (permalink) Old 30th May 2019, 14:50
 
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Fuel filter might be clogged causing reduced fuel pressure and running lean possibly?
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