Hello.

I'm trying to track down a code 43. I have the ESC with the module on the drivers side firewall by the way.
I'm getting the code 43 after driving a while and that led me to believe that I have a faulty knock sensor.
From what I read the ECM advances ignition until knock as a test at high load and temp over 194F and since I don't get a code 43 after resetting the comp and driving light around the block the knock sensor and not the ESC should be at fault, correct?

I checked all the connections/wires. OK

I checked ground at CKT486 (at ESC). OK

I checked ign feed at CKT 439(at ESC). OK

I checked resistance at the knock sensor between sensor and block. I get a reading that there is indefinate resitance eg. open circuit.

Should the knock sensor be this way or is it broken? I read that the other spark control system has a knock sensor that gives 3300-4500 ohm. Should this one also? I'd hate to pull it and dump all that water on the ground just to find out that the sensor is ok.

What do you guys think? Am I on the right track?

Thanks for reading through, unless you just skipped through to the end.

B.

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86-IROC
305 TPI dished pistons, TES, 3" cat, 2.5" Flowmaster
Crane powermax 290 (@0.050 216/216 0.454" 110 lobe.sep)
Direct gear drive
2800 conv, 3.73 gears (open)
No-screen MAF, gutted airbox(es)
24 lbs injectors.
Accel cap+wires+plugs
75 corvette heads 76 cc :-(
Steel crank.

 

So, to narrow it down, should there be any resitance on the knock sensor when one measures it (connector-engine block)?

Thank you.

B.

 

I have a much easier test for you to save the trouble.
Simply unplug the wire from the knocksensor and reset your ECM. Then drive to see if the code comes back. If you still get a code then it has nothing to do with the knock sensor itsself.

FYI, I drove & raced my 86TPI car for years with no knocksensor whatsoever. It will not harm anything as long as you keep your total timing around 37 degrees (would be 15 degrees initial or less using a stock ECM & chip). No problem.

good luck



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*I do custom performance mods on Edlebrock Performer carburetors (dualplane intake mods in the works),
White 1986 Irocz, 305/383 with Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, 3.25:1 rear, Mcreary Road-Stars, SLP-stainless 1.75" shortie headers & Y-pipe, single 3" Borla exhaust, Linginfelter-TPI camshaft part number 74216 pulls 17" vacuum solid. Cam specs 213/219 @.050 114-LSA, .462/.470 lift @1.5:1 ratio. MSD-6AL, billet distributor, multi-retard, blaster-3 coil, and RPM switch.
N/A runs 10.9 @124,
Crack-runs 10.3 @135
haven't run at track since Oct-99