ok like it says i am getting a code 43 how dose one advance spark? hummm i have been told ihave been a retard too long as well conection??? /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/histerical.gif
Probably means the knock sensor is sensing knock, causing the timing to retard for a long period of time...a little bit of knock/retard once in awhile would be normal (heavy acceleration) but I'm guessing with that code, SOMETHING is telling the ESC system to retard the timing for a long period of time.
Could be the knock sensor,ESC, etc., or there really could be engine issues that it is "seeing".
i only ever use ultra 94 highest you can get at the station anyway. pinging? /forums/images/graemlins/blush.gif /forums/images/graemlins/blush.gif /forums/images/graemlins/blush.gif /forums/images/graemlins/blush.gif
i run the high octain because it is actuly a little cheaper or about the same price as regulare gas, it gives me better mileage than lower grades. AS well in ontario we have emition testing every two years and in my first sub a 91 350 3/4 ton it just pasted when i got it and a year later when i sold it, the truck past beter than new, i feel it burns hoter and cleaner and have liked it so far. AS for the timeing i have not touched it at all.. /forums/images/graemlins/dunno.gif
Check your timing would be my suggestion, first off.
Don't have the manual here in front of me, or I'd check out the troubleshooting for code 43.
"Knock Sensor (KS) or Electronic Spark Control (ESC) circuit fault" is the description of that code I found online.
Not sure if I can check tonight, perhaps someone else on here with a service manual will be kind enough to look up code 43 for you, and tell you the diagnostic procedures.
Always nice to have the manual in cases like these, as the diganostic portions are typically very long.
Notice that the description is *circuit* not *component* so even by replacing either one of those, you might very well not even solve the problem. There are a few things tied into that circuit, so a manual is your best bet to logically narrow down the culprit.
Out of the '88 TBI Camaro section, the first test is to use a scan tool at idle to watch for knock.
If you don't have a scan tool, (or probably winALDL) the rest of the test procedures are not going to help you much, as most all call for the scanner to be hooked up while testing.
About the only tests you can replicate are checking to make sure most wires aren't shorting to ground, and making sure all connections are tight...ESC module, knock sensor, and at the ECM. (doubt the ECM connection is a problem, you'd have more issues) The only specifics I can offer from *this* manual for an intermittent code 43, is to check circuit 485 (pin "C" on the ESC module in this diagram) for possible short to ground.
As you mentioned it is only when accelerating, I seriously doubt there is a short to ground, but again, to test actual knock, you've got to have a scanner. My interpretation of the manual indicates it will trip the light if knock (low voltage on circuit 485) is seen for 5 seconds.
If you've got a laptop, or can borrow one, you can "make" a scantool for about $9.
winALDL is one of the programs you can get for free that lets you "watch" (and save) what the engine is doing. I believe the $9 cable I'm talking about most call an ALDL cable, or ALDL diagnostic cable. They are all over on ebay, but about $40.
Instructions can usually be found wherever you find reference to winALDL.
One word of caution though, a LOT of what you use a scan tool for requires the help of a manual, because the test procedures are in logical order (flow charts) and the values (voltage, signal, whatever) you are looking for are referenced in the manual as well.
I bought an AutoXray XP240 used off of ebay a few years back for $120, with all three cables. (GM Ford and Dodge)
You only need the OBD1 style if you decide to get a scanner...the XP240 works on every GM vehicle I can think of (with an ECM or ALDL connector) from 1981 until OBD2.