knock sensor

[Guest]

Glad to hear that your car is fixed and running well. I was hoping to talk to you last Saturday about your knock sensor experience, as I have been having similar problems. I even went so far as to get the new cylinder heads to reduce compression, but I'm still having problems. The car ran great for awhile with the new heads and 7 psi pulley, but after getting a dynotune last week, I'm getting the CE light and the ECU is retarding the ignition timing. I will be taking it in to get an EBDII scan tomorrow. I hope it's not the knock sensor again, as I just replaced #2 when I got the new heads. I will be looking seriously at the JP Performance headers in the near future to free up the exhaust flow.

By the way, I'm still surprised that you had to get both knock sensors replaced. Everyone else, myself included, has only had problems with #2. I hope the dealership didn't take you for a ride on that one. Did your OBDII scan show problems with both of them?

[cdssolara]

This post was mine. I don't know why I wasn't automatically logged in.

Glad to hear that your car is fixed and running well. I was hoping to talk to you last Saturday about your knock sensor experience, as I have been having similar problems. I even went so far as to get the new cylinder heads to reduce compression, but I'm still having problems. The car ran great for awhile with the new heads and 7 psi pulley, but after getting a dynotune last week, I'm getting the CE light and the ECU is retarding the ignition timing. I will be taking it in to get an EBDII scan tomorrow. I hope it's not the knock sensor again, as I just replaced #2 when I got the new heads. I will be looking seriously at the JP Performance headers in the near future to free up the exhaust flow.

By the way, I'm still surprised that you had to get both knock sensors replaced. Everyone else, myself included, has only had problems with #2. I hope the dealership didn't take you for a ride on that one. Did your OBDII scan show problems with both of them?

[SC V6]

Ur still having problems? its probably the lag of the exhaust... im having no troubles at all... keep me posted.. I go to the dyno tomorrow... so ill post my resultsb

[SC V6]

so u have jims heads, stock injectors, headers, and y-pipe?

[Guest]

Ur still having problems? its probably the lag of the exhaust... im having no troubles at all... keep me posted.. I go to the dyno tomorrow... so ill post my resultsb

I wasn't having any problems until I dynoed my car. The CE light came on every time, and the timing was retarded. The best I could get was 246 fwhp and 242 ft-lb. The hp number was actually a bit less than what I got previously with the 5.5 lb pulley, S-AFC and Apexi WS catback. This time, I had Jim's heads and a 7 lb pulley. I haven't bought headers yet, but it looks like I'm going to need them. And yes, I have stock injectors.

It sounds like you fixed whatever problem you had last week. What was wrong with your car that was causing the hesitation and other issues?

[cdssolara]

Sorry, the above post is mine again. I don't know why I'm not being logged in automatically anymore.

[cdssolara]

Forget my earlier post about nobody else having trouble with knock sensor #1. I just had an OBDII scan to see what was causing the Check Engine light, and I got a reading for knock sensor #1. Now I wish I'd had both of them replaced.

[808Camry]

after replacing the knock sensors, you can easily blow then again correct if you continue to run high boost? Have you guys switched back to your stock pulleys?

[SC V6]

my car was misfiring... but now its not... do u have a stick??? because I have an auto, and I hit around 245 horse... so... I had no check engine light, but the guy at the dyno put my fuel around 12 to 1... to be safe... its pushing a WHOLE lot of fuel...but... yeah... I dunno...

[cdssolara]

after replacing the knock sensors, you can easily blow then again correct if you continue to run high boost? Have you guys switched back to your stock pulleys?

Yes, you can blow them again, although in my case I blew #2 with the 5.5 psi pulley, and now I've blown the #1 with a 7 psi pulley. I thought the car could handle the 7 psi pulley because I had new cylinder heads installed which lowered compression from 10.5:1 to 9.4:1. The good news is that the #2 sensor didn't blow again, so it looks like the replacement sensors are more resistant to blowing than my OE sensors. Unfortunately, this means that I'll have to pay to have another sensor replaced, which isn't cheap.

[cdssolara]

my car was misfiring... but now its not... do u have a stick??? because I have an auto, and I hit around 245 horse... so... I had no check engine light, but the guy at the dyno put my fuel around 12 to 1... to be safe... its pushing a WHOLE lot of fuel...but... yeah... I dunno...

Yes, mine is manual. I'm very disappointed in my hp number, since it didn't improve over the one I had with a 5.5 psi pulley, even though I have the new cylinder heads and the 7 psi pulley. Also, since I blew another knock sensor (this time #1) it would appear that I still have a fuel and/or exhaust flow problem.

I'm very interested in your results. You were able to keep your A/F to 12:1? Do you know what the adjustments on your S-AFC are? My car was not able to handle adjustments over +25%, which was what it looked like the car needed in order to get A/F below 13.5:1. It may be a backpressure issue that is making the boost and A/F too high, so I may need to get the headers ASAP.

However, you have the headers and injectors, yet you still only got 245 fwhp? That sounds too low, although your auto tranny isn't helping you. What kind of torque number did you get? I'm now thinking that the 7 psi might be a waste, and go back to the 5.5. I've got a number of issues to deal with now. What a pain in the a$$! I was hoping I'd now just be able to enjoy the car, but I guess there's more work and money ahead.

[808Camry]

my car was misfiring... but now its not... do u have a stick??? because I have an auto, and I hit around 245 horse... so... I had no check engine light, but the guy at the dyno put my fuel around 12 to 1... to be safe... its pushing a WHOLE lot of fuel...but... yeah... I dunno...

Yes, mine is manual. I'm very disappointed in my hp number, since it didn't improve over the one I had with a 5.5 psi pulley, even though I have the new cylinder heads and the 7 psi pulley. Also, since I blew another knock sensor (this time #1) it would appear that I still have a fuel and/or exhaust flow problem.

I'm very interested in your results. You were able to keep your A/F to 12:1? Do you know what the adjustments on your S-AFC are? My car was not able to handle adjustments over +25%, which was what it looked like the car needed in order to get A/F below 13.5:1. It may be a backpressure issue that is making the boost and A/F too high, so I may need to get the headers ASAP.

However, you have the headers and injectors, yet you still only got 245 fwhp? That sounds too low, although your auto tranny isn't helping you. What kind of torque number did you get? I'm now thinking that the 7 psi might be a waste, and go back to the 5.5. I've got a number of issues to deal with now. What a pain in the a$$! I was hoping I'd now just be able to enjoy the car, but I guess there's more work and money ahead.

245 FWHP on an auto is the highest I've heard of so far, I think we have a 20-25% loss in power due to the tranny. Correct me if I'm wrong.

[SC V6]

yeah... 20-25% loss is about right.. im happy w\ the number, but when I have my buddy re-build my tranny w\ that Level-10 kit, the power will finally be able to get to the ground....
my settings on my S-afc II never went above 16% inc... from Third gear to fourth, I am at a steady 12.1 ratio... its about perfect... but when im not all over it, it tends to burn a lot of fuel, so recently I have been setting the low settings down a bit, but keeping my high ones.. I like it, but I wish it was more hp at the wheels... I just can't wait for the tranny re-build.. so.. ill keep everyone posted...
later
Scott

[Guest]

yeah... 20-25% loss is about right.. im happy w\ the number, but when I have my buddy re-build my tranny w\ that Level-10 kit, the power will finally be able to get to the ground....
my settings on my S-afc II never went above 16% inc... from Third gear to fourth, I am at a steady 12.1 ratio... its about perfect... but when im not all over it, it tends to burn a lot of fuel, so recently I have been setting the low settings down a bit, but keeping my high ones.. I like it, but I wish it was more hp at the wheels... I just can't wait for the tranny re-build.. so.. ill keep everyone posted...
later
Scott

Your A/F numbers sound really good, so your engine should stay safe.

I'll be interested in your numbers with the torque converter upgrade.

[cdssolara]

Sorry, that was me again.

yeah... 20-25% loss is about right.. im happy w\ the number, but when I have my buddy re-build my tranny w\ that Level-10 kit, the power will finally be able to get to the ground....
my settings on my S-afc II never went above 16% inc... from Third gear to fourth, I am at a steady 12.1 ratio... its about perfect... but when im not all over it, it tends to burn a lot of fuel, so recently I have been setting the low settings down a bit, but keeping my high ones.. I like it, but I wish it was more hp at the wheels... I just can't wait for the tranny re-build.. so.. ill keep everyone posted...
later
Scott

Your A/F numbers sound really good, so your engine should stay safe.

I'll be interested in your numbers with the torque converter upgrade.