Help with 7730 on 305 SBC TPI (Speed Density)

**RadioTechMan** · 08-16-2013

Hello all,

It seems like forever since I have been able to get back to my original problem and to respond this forums wonderful Members.

So in response to EagleMark and JeepsAndGuns, I went back to basics.

I sat down again and discovered I had indeed been missing a step in getting the Moates to Data-log. I now have that sorted out and have that working. So once I was able to Data-log I soon realised that my Coolant Sensor and IAC Motor were both faulty (I assumed they were both new, but as it seems those were the two that had not been replaced during the restore) Whilst reinstalling these, I saw it fit to refurbish\clean the whole throttle Body, which had an excessive amount of build up on both the Butterflies.

Those have both now been replaced. When I did my initial startup, I tried setting the base timing to 0°; this resulted in good performance at Idle; but an unsatisfactory behaviour at spped (like it wasnt giving its all). I re-did this and set it to 6° before TDC (advanced), this gave me a consistent performance at Idle and speed and one of the best throttle responses I have had with this setup (My brother who built the engine for me, believes it is sounding the best it ever has)

The problem is that I am now getting some anomilies even with this now.

These symptons are (and all occur whilst stationary):-
X The Engine temperature starts of at normal levels but reaches upto 246 -248°F (near max of 250°F) I do live in a hot climate 30 - 40° C (86°F - 104°F) but cannot be certain this would be a contributing factor.
X I am getting an error on Target AFR (14.69) this does not change at all.
X I recieve a code 42 (EST)
X I recieve an error on switch (Big Trouble - MALF Occured + Test)
X My Loop Status swaps between Open and Closed is that normal?

I know some of these sound like noob questions, but I kinda need to know where I am heading.

I am going to start to compare my $8D bin tommorow and see if some of these issues are because of an inconsistent Prom burn.

I have attached photos below in case they might help.

Again I want to thank all of those who have contributed to this thread so far, as I now feel that I am moving forward with this problem.

Thanks,

PS. I have just discovered I cannot post picture from computer, so If you have any questions that need them pls ask.

Again, Many Thanks all.

**Tunedperformance** · 08-16-2013

Wow your running that engine hotttt, you might want to lower down the fan on if controlled bye the ecm. The most common cause of the code 42 is poor connection or faulty knock sensor. from the center connection to the body during malf check the ecm expects to see 3.9k ohms. This issue is rarely ever the esc knock board soldered on to the memcal but could be the ecm. You should check the connections even at pin f9 .

**RadioTechMan** · 08-16-2013

Believe me, I do not want it to run at that temp. I currently run two thermo fans, both are 14" (One Pull, One Push).

I'll have to check what the bin is set to but I belive it is ecm controlled. Again, I will also check ecm tommorrow.

Thanks, for your input; Ben