LOSS of power after headers

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Oct 25, 2015 | 08:51 PM

shaun99z28

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LOSS of power after headers

Just put some LT headers on my 99 z28 6 speed car with a 3 inch cat less wye pipe. I do not have a tune on the car yet but I will be getting on next week. The car us missing between 4000 and 6000 rpms at WOT. I want to make sure that I don't have another problem before taking it to the tuner. Thanks for any Input..

Oct 25, 2015 | 09:07 PM

Paul Bell

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From: NYC

A tune should fix all that.

Did you change the spark plugs?

Oct 25, 2015 | 09:39 PM

shaun99z28

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Quote:

Originally Posted by Paul Bell

A tune should fix all that.

Did you change the spark plugs?

Yes changed the plugs when I installed the headers. Put a ngk tr55 gapped @ .050

Oct 25, 2015 | 10:20 PM

Majestic9C1

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From: Cincinnati, OH

probably caused by the rear o2's not tuned out yet..

Oct 25, 2015 | 11:05 PM

Paul Bell

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The rear O2 sensors only gauge the efficiency of the catalytic converters. They have no bearing on how the PCM controls the engine-which is why they can be tuned out.

Oct 25, 2015 | 11:12 PM

CoolAid

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Check for a cracked spark plug with misfire checks on a scanner.

LS1 Fbod plugs are a bitch to service. I cracked the #8 taking it out when I did LTs. You might have cracked one putting em in.