986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - P1126 and low rpm hesitation - all troubleshooting listed- Help greatly appreciated!

JFP in PA · 01-12-2021, 01:34 PM

I'd start pulling the fuel injectors, looking at the tips for carbon fouling.

RKAT is the adaptation value near idle.
FRA is the adaptation value under load and further divided into FRAU (lower load range ) and FRAO (higher load range) ranges (perhaps the durametric doesn't display these divisions).

The RKAT values near idle are used to change the length of the injector pulse to account for deviations from ideality (ie intake leaks) to maintain the proper O2 sensor reading. The RKAT value is an additive factor and can deviate by +/- 4.5%. The FRA value is a multiplicative factor and can deviate by 1.32 to 0.70. The positive values or values greater than 1 increase the injector pulse length to account for a lean mixture, and negative values and values less than 1 are to compensate for a rich mixture.

01-12-2021, 01:34 PM	#3
JFP in PA Registered User Join Date: Feb 2005 Location: It's a kind of magic..... Posts: 6,482	I'd start pulling the fuel injectors, looking at the tips for carbon fouling. RKAT is the adaptation value near idle. FRA is the adaptation value under load and further divided into FRAU (lower load range ) and FRAO (higher load range) ranges (perhaps the durametric doesn't display these divisions). The RKAT values near idle are used to change the length of the injector pulse to account for deviations from ideality (ie intake leaks) to maintain the proper O2 sensor reading. The RKAT value is an additive factor and can deviate by +/- 4.5%. The FRA value is a multiplicative factor and can deviate by 1.32 to 0.70. The positive values or values greater than 1 increase the injector pulse length to account for a lean mixture, and negative values and values less than 1 are to compensate for a rich mixture. __________________ “Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein Last edited by JFP in PA; 01-12-2021 at 01:39 PM.