Hello,

This is my first post. I decided to join up here since I am running out of ideas about a KR problem I am having on a new to me 2002 SSEi.

The car is in very good shape and only 120k miles. I am currently seeing 1.5 to 3.0 KR at full throttle (with 92 octane). Here is what I have done to address this problem so far:

New Water pump
New Radiator
185 degree thermostat
Separate transmission cooler (no longer connected to radiator)
Made an air scoop between the two fog lights from aluminum and lexan (really helps temps but not KR).
Removed hood insulation and raised the back of the hood a bit.
One step colder copper plugs.
New gasket in airbox between the two halves.
Cleaned the MAF sensor.

Even with coolant at 185 degrees and intake air temp at 85 degrees I still get those levels of KR. What else could it be?
I am wondering if it could be a fuel injector that is not flowing well, or a vacuum leak somewhere?

What would you try next?

thanks

Is your fuel pressure up to snuff?

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

That's a good question. I just realized yesterday that the fuel filter has probably never been changed. The car has 120k miles, so I will be doing that next.

So after changing the fuel filter and running some fuel injector cleaner through it, results are the same. For now I am out of ideas but at least all the maintenance is done to make it a good daily.