Thread: KR Question??

Originally Posted by iluvbst

ok ive got a 98 gtp, only thing done to it it "4 open cone intake (HAI) and u bend and cat delete. why im i seeing so much KR? i saw 8.3 kr today. the car is basically stock, are you suppose to have that much kr stock? And i know its real cause it only happens in high rpms when its floored. What can i do to help it? i personally think its the bosch plugs i have in the car....i didnt put there, came with the car, just noticed it. could that be what cause so much knock, cause of the heat range?

8.3 seems pretty high esp with the u bend gone and a intake. Could be many factors. Id suspect the fuel system has something going on and maybe its leaning out. Posting a scan would help

that is a lot, i'd stay out of WOT for awhile. change the plugs out to autolite 606's, i've heard 3800's don't like bosch. my question is, what happened to the rear o2 sensor? if it's not there, it should be sending a code, and if it's not there it could cause a lean situation. do you have an emulator or anything?

scan or no diagnosis. what is the car DOING?

Originally Posted by iluvbst

i run 93 all the time, the only code i get is the cat code i think its 420 or somthing like that..ill try to get up a scan soon, at work now..thanks for fast reponses though. the only thing i can remembar off hand is...LTFT is at 12 when wot, B1S1 is at 91, afr was at like 11..if this helps

Doesnt really help. What bio is wanting is a basic excel style spreadsheet of everything the car is doing while idling, normal driving, and a slow steady increase to WOT so we can determine where the flaw is at by how the engine is running during these conditions.

Click the link and youll see what im talking about in this thread
http://www.grandprixforums.net/my-scan-35735.html

too much to pay attention to. you need to scan so you can reference like 6 different values at the same time.

Originally Posted by iluvbst

i run 93 all the time, the only code i get is the cat code i think its 420 or somthing like that..ill try to get up a scan soon, at work now..thanks for fast reponses though. the only thing i can remembar off hand is...LTFT is at 12 when wot, B1S1 is at 91, afr was at like 11..if this helps

Lft at 12 Wot is a major factor of your knock. your afr is just commanded and not a true afr unless you have a wideband.

ok so what does the the LFT mean? is it lean is it rich? and i know the afr is not true...still gives you an idea of where your ratio is..

that means your way lean. Id say about 5-7 percent lean. For example if you were running a 11.5 afr you could really be hitting 12.1-12.3. which would explain the high levels of Kr. Sounds like you have something on the fueling end creating issues or a crap tune. A real scan would help and a reading on fuel pressure would aswell

Originally Posted by iluvbst

yeah just googled it..said the pcm is trying to richen the mixture....so next question is, could my o2 be causing this? is that 0420 code just for the cat or for the o2 too?

0420 is for the rear cat. Not causing this no. Could be related. Id say you have a fuel pressure issue. Maybe the pump or a FPR

Vac T there is fine. You can try your filter and see what happens. Also pull the vac line for the FPR and see if it has gas in it.

sounds like your tune is off or you have a small vac leak which is forcing the car to run lean.