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OBD 1 code 43 *&#$@@#

todds302

todds302

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Feb 28, 2009
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Cartersville Georgia
This is what the beast is doing now, start up runs fine drive it through town, when leaving to go out of town up a hill, check engine light pops on, retards timing I can feel the power loss, get to the top of the hill, code clears and timing and power are back. Then leaving work, get truck to op temp start driving on interstate press down gas, Looky there that stupid little check engine light is on again, and no power, drive it for 15 minutes on interstate. Then all of a sudden the power is back and check engine light shuts off. This is really pissing me off, My mechanic doesnt know why either, I am running the 12-304-4 cam in my truck with TBI. Timing is at 12 degrees seems to run better there even before code 43, has new knock sensor and tuneup plug wires, o2 sensor. Please help,
 
The code 43 is probably the hardest code to trouble shoot. I've had it myself in the past doing EXACTLY as yours is and I never changed anything, all I did was remove all the connectors from the ESC module, knock sensor and TPS and cleaned them really good and used some die electric grease in the connectors then reattached them and my problem went away.

Timing should be set to TDC (zero) with the EST wire disconnected. The ECM controls the timing so it is pretty useless to be messing with the initial advance anyways.
 
Even a slight ping from advancing the timming will cause your problem.
 
Haqs to have the timing set to 0 with the connector disconeccted. You are multiplying base timing and 12 degrees is WAY WAY to much. even 2 degrees is to much. Go read a manual so you get all the correct info. :waytogo:
 
yes but according to comp cams timing is right on it has the correst base timing, The guys that put the engoine in had the timing at 24 degrees, but never did the code 43
 
Run some super unleaded and maybe some octain boost to see if the problem goes away.
 
todds302 said:
yes but according to comp cams timing is right on it has the correst base timing, The guys that put the engoine in had the timing at 24 degrees, but never did the code 43
Click to expand...

I'm a little confused on the first half of your reply that i've made bold.

Now about the second half, 24* would be about where the timing would be WITH the EST wire connected AFTER the timing was set to TDC with the EST wire DISCONNECTED. Hope that didn't confuse you (basically you disconnect the EST wire then put timing to TDC, once the EST wire is reconnected the ECM takes control of timing and advances it to around 22-24* advanced).
 
It also had a miss in at the timing that high. We have the timing re set, at the 12 deg any higher it develops a miss then idle issues and stalling at a stop....This cam is supposed to have a 6 deg advance for timing anyway
 
todds302 said:
It also had a miss in at the timing that high. We have the timing re set, at the 12 deg any higher it develops a miss then idle issues and stalling at a stop....This cam is supposed to have a 6 deg advance for timing anyway
Click to expand...

Cam timing and crank timing are completely different.
 
One question you really need to answer.
Did you disconnect the timing bypass wire when you set the timing????
That MUST be done to correctly set timing.
 
I have to disagree with this. I advance base timing on all my TBI motors. I run my current motor at 5 degrees advance at the crank with the est wire disconnected.

The motor is more responsive and runs better throughout the RPM range.

I do agree that fatory timing settings on TBI motors is 0 degrees but I've always added at least two degrees even on a stock motor and the difference is evident.

-Phil
 
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