Incorrect AFR at WOT Help!!

AJP turbo · August 08, 2015, 05:20:45 PM

Have u seen your spark at low loads?...it's likely 30-45 degrees....very easy to get knock there...and when u are tipping in and out of the throttle it can be lean for a brief time making preignition possible

Remember the ecu is always riding the edge of incipient knock so even at part throttle you are making maximum power

curry67 · August 08, 2015, 06:50:53 PM

Would a induction service help with this what so ever?

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kskrew4life · August 08, 2015, 07:19:27 PM

yes premium .. mobile one... i tried again earlier on the highway now no kr cruising.. wierd

AJP turbo · August 08, 2015, 07:24:30 PM

Quote from: kskrew4life on August 08, 2015, 07:19:27 PM
yes premium .. mobile one... i tried again earlier on the highway now no kr cruising.. wierd

Not weird.....from drive to drive the car experiences different conditions all the time.

SHOdded · August 08, 2015, 07:48:04 PM

Make a note of as many details during the occurences as possible: what gear you were in, what were the rpm's, did the load change, how much advance, etc. Like aj says, probably perfectly normal, but since we like dig into things here, why not?

Sometimes sensors have a brain fart or valves don't open/close at the precise moment they are expected to. I assume the knock sensor wiring has been checked and/or taped off? BTW, at least in some people's experience, even Mobil 1 may not be the best fuel for your area. So try changing brands (always use a high-volume station, preferably top tier) and see if that makes any difference. Run some Techron or BG44 through the gas tank (doesn't hurt, may help).

kskrew4life · August 09, 2015, 02:02:58 AM

Hi guys here is the latest log its pretty meaty..all looks well here

kskrew4life · August 09, 2015, 02:05:29 AM

this is the previous log showing KR above +3 (same tank of gas as the meaty log)

kskrew4life · August 09, 2015, 02:14:21 AM

Quote from: SHOdded on August 08, 2015, 07:48:04 PM
Make a note of as many details during the occurences as possible: what gear you were in, what were the rpm's, did the load change, how much advance, etc. Like aj says, probably perfectly normal, but since we like dig into things here, why not? Sometimes sensors have a brain fart or valves don't open/close at the precise moment they are expected to. I assume the knock sensor wiring has been checked and/or taped off? BTW, at least in some people's experience, even Mobil 1 may not be the best fuel for your area. So try changing brands (always use a high-volume station, preferably top tier) and see if that makes any difference. Run some Techron or BG44 through the gas tank (doesn't hurt, may help).

Im always monitoring the data in real time which is not really a good way to actually create logs. I have an hour trip later today so i will log at cruising and see if anything comes up. Techron vs BG44 is one better than the other? i have never add any additives to my tank before so deff not a bad idea. Mobile is considered top tear here. I always used to go to cumberland farms (golf re-brand) but they were recently acquired by a different company. the choices here are Hess, sunoco, golf, mobile, stewarts, shoprite, BJ's.... and literally as of today a Speedway. I have no idea if speedway is any good. there are numerous no nane gas stations which i tend to stay away from. There is a pitstop but they dont have 93 octane gas.

SHOdded · August 09, 2015, 05:55:44 AM

BG44K is generally considered a superior FI cleaner, but Techron is also very very good (OEM recommendation from BMW, e.g.). Neither will get any carbon on the backs of the intake valves, but anything from the fuel tank to the combustion chamber to the valve faces will get cleaned out. I recently put up a thread about ACES IV, which MIGHT work on the back of the valves also, but little data on that.

No Costco? These are Top Tier stations:
http://www.toptiergas.com/retailers/

ZSHO · August 09, 2015, 08:18:48 AM

I certainly agree with SHOdded,and definetly pour a can of B.G 44K fuel system cleaner in your tank at least every oil change for optimum performance especialy if your limited to top tier gasoline in your area,have been using BG-44K and Chevron techron for quite sometime now and definetly would recommend them,personaly like the BG product thats in a can and the label clearly says made for DGI. Z

SHOnUup · August 09, 2015, 09:25:36 AM

I used this and have gained 2 mpg's since...hovering at 21.8 instead of 19.9

Rich

SHOdded · August 09, 2015, 09:56:42 AM

So this "tea" from Amsoil might have something to it, eh? Interesting.

SHOnUup · August 09, 2015, 10:20:07 AM

Quote from: SHOdded on August 09, 2015, 09:56:42 AM
So this "tea" from Amsoil might have something to it, eh? Interesting.

Ran it in the tank on the way to SHO-CAGO and averaged 24.3 with a 17% corn mix and avg speed of at least 82 mph with a few WOT pulls into triple digits....with 4-500 lbs of cargo on the way home and the regular fuel concoction of 10% E, avg speed of 90+, and a few WOT pulls DEEP into triple digits we got 26 mpg's!!!

The 21.8 I'm at now is with a full night of shenanigans on Woodward SHOwing many V8'S what the family sedan is packing...had a guy in a Charger RT look over at a light and say, "I see what you did, we can't tell what car you're driving"..."just a taurus"...he asked to run em then...I swear I put at least 6 cars on him by 70 mph

Rich

BiGMaC · August 09, 2015, 10:33:31 AM

Has anyone used the BG Gasoline Direct Injection Cleaner (their part #s 271 and 272?

SHOdded · August 09, 2015, 04:19:53 PM

Little nuggets of info throughout this thread (not specifically DI, but Techron FI cleaning-related):
http://www.renntech.org/forums/topic/44858-using-techron-concentrate-total-system-cleaner-anyone/