Knock, knock...

[Wookie]

I'm experiencing knock at low boost levels. In the neighborhood of 5-10 lbs. I don't hear it, but it appears on my scanmaster and turbolink. I'm using a TT chip, TE-44 turbo, 40 lb injectors, Fp line off is set at 43, upgraded fuel pump and hot wire kit. Here are the numbers

IAC - 104
Lv8 - 243
Tps - 1.70
Int - 128
O2 - 808
Maf - 138
Blm - 116
Spark rtd - 1.9
Rpm - 2950

Any ideas?

 

[NorEaster]

Those readings are at hot idle in Park?

 

[Wookie]

No, the numbers are not at hot idle. They are at cruise then rolling into the throttle.

 

[NorEaster]

Get them at hot idle in park. Probably won't solve you knock issues but a sensor may not be adjusted.

 

[Wookie]

Here are new numbers recorded with Turbolink. These were recorded with the car in 3rd gear. I lifted off the gas pedal when spark retard appeared. Boost was between 8-10.

IAC - 107
LV8 - 255
Tps - 1.74
Int - 128
O2 - 820
Maf - 225
Blm - 115
O2 delta - 0
Mat - 91
RPM - 3775
ESC - 3#
Spark Retard - 1.9
coolant temp - 163
MPH - 68
Volts - 11.5
Egr - 0%

 

[Eric Stage I]

Volts 11.5? Sounds like a good starting point.

 

[slick6732]

Subscribed, have the same voltage problem

 

[captflash]

Subscribed. Same issue

 

[williamsGN]

Check your voltage at the battery, should be near or over 14V. The scanmaster always reads lower than what the battery is getting, usually by about a volt. Mine reads in the 12s to low 13s when cruising and that is acceptable.

 

[slick6732]

Check your voltage at the battery, should be near or over 14V. The scanmaster always reads lower than what the battery is getting, usually by about a volt. Mine reads in the 12s to low 13s when cruising and that is acceptable.

Thanks, going to go check it now! Will post back with findings..

 

[slick6732]

Thanks, going to go check it now! Will post back with findings..

13.01 to 13.06 at Battery, Idle...

 

[Wookie]

I would like to thank everyone for the help. I followed Steve Woods instructions "How to find dropped voltage"

http://www.vortexbuicks-etc.com/measuring_voltage_drop_across_a.html

Cleaned up my grounds, I'm now seeing 13 - 13.5 volts at cruise. When I roll into the throttle the voltage stays above 13 volts and I'm not seeing any knock.

Now it's time to fix the oil leaks!

 

[87-WE2]

When you get all those oil leaks fixed, please post a thread on "how to fix oil leaks"!!!! I dont think i'll ever get all of mine fixed, especially the one at the driver side taillamp!!!!

 

[slick6732]

I would like to thank everyone for the help. I followed Steve Woods instructions "How to find dropped voltage"

http://www.vortexbuicks-etc.com/measuring_voltage_drop_across_a.html

Cleaned up my grounds, I'm now seeing 13 - 13.5 volts at cruise. When I roll into the throttle the voltage stays above 13 volts and I'm not seeing any knock.

Now it's time to fix the oil leaks!

What grounds did you clean up? Body, Back of block or all?

 

[Wookie]

I cleaned grounds at the back of the block and battery to block. Also, disconnected battery terminal and cleaned wire leads going to them. Good luck.

 

[Wookie]

I thought the problem was fixed, but I'm seeing spark retard on Scanmaster and Turbolink. Here are the new #'s at approximately 14 #'s boost. Any help will be greatly appreciated.


Iac - 94# 36%
Lv8 - 255#
Tps - 1.86 v
Int - 128#
O2 - 796 mv
Maf - 213
Blm - 116#
O2 delta - 0#
Mat - 79°
Rpm - 3300
Esc cnts - 3#
Spark rtd - 8.5°
Coolant temp - 163°
Volts - 13.2 v
Egr - 0%
Tcc - on
3rd gear - on
4th gear - on

 

[SCOOBY DOO]

What's your fuel pressure at 14 PSI of boost?

 

[Wookie]

I didn't have a fuel pressure gauge connected at the time. But, I did test FP to boost a couple of weeks ago and it was 1:1.

 

[Fast4Ward]

octane? ....race gas time to find the problem perhaps.