so i changed my knock sensor

asd_gst · 08-03-2008, 10:31 AM

i changed my know sensor it was completly gone there was no goo left in it. but the car still knocked, so we messed with the timing, set the timing back it didnt knock but once i hit about 5psi it knocked like crazy. so we changed what we were logging, and looked at the o2 and it would flat line and stay at 0 so we unpluged it now the car runs better and doesnt really knock more then like every now and then like 4-6 counts, but i need to rewire my fuel pump ### i think that is part of the problem too

tunethis · 08-03-2008, 10:47 AM

I guess you need a new o2 so the car computer can obtain the proper a/f ratio's. I too replaced my worn knock sensor with a new OEM and still had plenty knock. I'm still working on that issue though.

asd_gst · 08-03-2008, 11:07 AM

Quote:

Originally Posted by tunethis

I guess you need a new o2 so the car computer can obtain the proper a/f ratio's. I too replaced my worn knock sensor with a new OEM and still had plenty knock. I'm still working on that issue though.

yea thats the same with me lol but at least my knock is way lower now

ali · 08-03-2008, 11:21 AM

yea I am also having the same problem, I just bought a new knock sensor to see if that helps. But no matter what I do with my timing I will get knock. Also it doesnt go past 43counts of knock.

asd_gst · 08-03-2008, 11:28 AM

Quote:

Originally Posted by ali

yea I am also having the same problem, I just bought a new knock sensor to see if that helps. But no matter what I do with my timing I will get knock. Also it doesnt go past 43counts of knock.

i dont think it will mine never went past 43 either, but how tight is your knock sensor? and retard your timimg alot and its shouldnt know as long as your dont boost thats what we did, but when we boosted it knocked, check your o2, injectors, and everything else. but if your car is your daily driver just retart the timing alot like move the cas like 1/2" back. it shouldn't knock as long as you dont . what type of gas are you using?

Black_Bullet · 08-03-2008, 12:34 PM

I wouldnt recommend someone to retard their cas to decrease timing... Its just a bandaid.... Lower the boost or dont boost until you figure out the issue which would likely involve getting a wideband and control over your ign timing maps thru the ecu..

OP your knock sound ok now though... Sounds like you had a AFR issue....FWIW, i ignore any knock under 5counts on my own car and would consider it a good tune still... If it doesnt exceed 10 counts i dont think your hurten anything at all,these are very stout motors.

ali · 08-03-2008, 12:41 PM

Quote:

Originally Posted by asd_gst

i dont think it will mine never went past 43 either, but how tight is your knock sensor? and retard your timimg alot and its shouldnt know as long as your dont boost thats what we did, but when we boosted it knocked, check your o2, injectors, and everything else. but if your car is your daily driver just retart the timing alot like move the cas like 1/2" back. it shouldn't knock as long as you dont . what type of gas are you using?

I'm only running pump gas 92

ali · 08-03-2008, 12:42 PM

Quote:

Originally Posted by Black_Bullet

I wouldnt recommend someone to retard their cas to decrease timing... Its just a bandaid.... Lower the boost or dont boost until you figure out the issue which would likely involve getting a wideband and control over your ign timing maps thru the ecu..

At idle my AFRs are around 14.8-15.3, but when I build boost my AFRs are around 10.5-10.0 only pushing 5psi

Black_Bullet · 08-03-2008, 12:44 PM

Quote:

Originally Posted by ali

At idle my AFRs are around 14.8-15.3, but when I build boost my AFRs are around 10.5-10.0 only pushing 5psi

Sounds like rich knock....I take it you've already done a boost leak test right ? If not thats were you start.

asd_gst · 08-03-2008, 07:05 PM

ok well tonight my car was knocking up to 43 again but mainly around 10-18 psi just cruising speed, what the hell is wrong with it!!!

but hopefully new injectors, o2 sensor, and rewire fuel pump will fix it

r1991_4g63t · 08-03-2008, 07:12 PM

Quote:

Originally Posted by asd_gst

i dont think it will mine never went past 43 either, but how tight is your knock sensor? and retard your timimg alot and its shouldnt know as long as your dont boost thats what we did, but when we boosted it knocked, check your o2, injectors, and everything else. but if your car is your daily driver just retart the timing alot like move the cas like 1/2" back. it shouldn't knock as long as you dont . what type of gas are you using?

it cant go past 43 but id bet its alot higher, as for moving the CAS 1/2 in... are you nuts? that would be like 20 degrees.

asd_gst · 08-03-2008, 07:17 PM

i put it back, and it was just to see if it would work we moved it drove it, then moved it back to where it was or close just kept moving it till it didnt knock, then unpluged the o2 put the cas where it was when we started and no more knock, now i was getting knock just driving but only once today, and im running pump gas 93

r1991_4g63t · 08-03-2008, 07:20 PM

100 octane

, no knock to 15 psi

asd_gst · 08-03-2008, 07:25 PM

93 octane, 9psi lots of knock

Black_Bullet · 08-03-2008, 10:14 PM

Quote:

Originally Posted by r1991_4g63t

100 octane

, no knock to 15 psi

93 octane no knock to 25psi....

OP, check to make sure ya knock sensor isnt loose, its highly possible that you have bad case of phantom knock...
Filling with race gas could help identify whether the current knock is real or not.

asd_gst · 08-03-2008, 10:17 PM

i dont care about your psi lol or octane, i need to get arid of my knock

asd_gst · 08-05-2008, 10:01 PM

ok i bought a new o2 sensor thought it would fix it, but i was wrong once again, so new knock sensor new o2 sensor, both were bad now both are good still picking up knock, its only random anywhere from 4-43 counts, im thinking my fuel pump since its never been rewired? im pretty sure its a fuel problem and so is my brother who works on cars for dodge, what do you guys think?