Car runs like poop when cold

Started by 1990_fc3s_t2, April 26, 2011, 10:27:03 PM

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yiug412

#15
May 02, 2011, 11:14:21 PM
I have just installed the SAFC today and went out mapping it with my frd. As I\'m running 880 on secondary mine is around +40% to lean it to 14.7 on the LOW THR. When I went on to the HI map I boosted the car once to 6k. After the boost the ecu wouldn\'t let me go into secondary throttle after 4000 rpm . I tried disconnect the battery but this problem still happens. Is this the ecu went into limp mode?

Also is it common for the knock sensor to fail? Mine is reading 0 knock all the time...

Cheers

Louis
1984 Honda Civic EF single carb 1.4
1989 Nissan Cefiro A31 RB20DE
1990 Toyota MR2 Turbo SW20 3SGTE
1990 Mazda RX7 TII FC3S 13BT
2004 Mazda RX8 231 SE3P RENESIS!
1974 Leyland Mini Mk3 1000
1994 Mazda MX5 1.8i BP
2003 Mazda RX8 231... something with turbo.
Always put a smile on you when the \'beep\' goes on :chat

Prof

#16
May 03, 2011, 07:36:01 AM
Quote from: yiug412;759629Also is it common for the knock sensor to fail? Mine is reading 0 knock all the time...
 
Cheers
 
Louis

Knock is very transient - the knock sensor is just a tuned microphone, so what you see if you look at the output on a scope is just some waveform when you hit the block with a hammer to simulate a knock.  If you do this whilst the engine is running, you can actually see it retard ignition timing - which is all the stock ecu does with it.
 
If you connected a voltmeter to the knock input to the ECU - you\'d just see 0v most of the time.
"Plus this engine is probably one of the most volumetric engines going! It passes more air than a herd of cows eating vindaloo\'s" - courtesy of AtomicRex

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