Electronic spark control module

[saeedbeck]

Re: Electronic spark control module

Well, this is my list of things to do next. Test output of temp sensor and iac. I bought a O2 sensor but never installed it because I never got a code for it. I might as well replace it anyway. I have a new question, though. I was convinced that it was computer fault that was miscalculating my timing and causing this miss, but when I disconnected the tan wire with the black stripe, nothing changed. It is my understanding that the computer cannot control the timing when the tan wire is pulled. Is that right?

 

[nightdiver]

Re: Electronic spark control module

When you disconnect the tan wire the timing has got to drop to 0 degrees. Get an advance gun and measure the timing. My sy had 20* with the wire on and 0* without it.
If you drive the truck with such a low advance , serious damage will occur due to high exhaust temps
Use a polymeter to see if the wire is in one piece. Also check to see if its grounded.
Disconnecting the tan wire makes the truck idle between life and death

 

[saeedbeck]

Re: Electronic spark control module

My timing was 7*advanced with the tan wire disconnected. Adjusted it to 1.5 * advance and reconnected the wire. I am not sure what the tan wire is grounded to. It just goes from the computer out to the distributor. Everything is stilll running the same. The coolant temp. sensor is reading correctly. It was reading .613 at around 140*. I was wondering what the sensor that is located at the top of the upper intake on the opposite side of the throttle body. Need to check the IAC output.

 

[nightdiver]

Re: Electronic spark control module

what was the timing with the wire on ? It has to go at least at 15*. There are a few versions of our chips but i think all of them uses over 15*
The sensor on the top/front of the intake is used from the ecm. The gauge takes readings from the other one.
her is the chart from the repair manual about the resistance vs temp.
210F ~185 OHM
160F ~450
100 F ~1800
70F ~3400
40F ~ 7500
20F ~ 13500
0F ~ 25000
-40F ~100700
so i guess your sensor is fine.
try to measure the advance @ BAD idle hot with the wire on and tell us what you find
The tan wire goes from the ecm to the knock sensor, doenst go to the dist.

 

[saeedbeck]

Re: Electronic spark control module

I will let you know tommorow. What does BAD idle mean, by the way? Does that mean normal operating temp? So the tan wire goes to the knock sensor. I read my chilton's manual and it went from tan to dark blue. My wire is light green. It had me wondering if I had wires switched. A buddy of mine was a GM Mech for 7 years and insists that he can solve my problem in 7 minutes. I will let you know what happens. Later.

 

[nightdiver]

Re: Electronic spark control module

The idle is terrible because of a noticeable "miss" in the engines operation

thats a bad idle.
Your friend is right . With a tech 1 he can monitor all sensors and functions

 

[saeedbeck]

Re: Electronic spark control module

Today, I checked the timing while the tan wire was hooked up and my timing was around 30* advance. A little high, I also had a diagnostic done and turns out my sparkplug on the number five cylinder had the electrode bent in. I must have bumped it when I replaced them. My truck runs a hell of alot smoother now. I will replace my wires, spark plugs, and cap and rotor, AGAIN. I really didn't use the best quality parts the first time. I know what spark plugs to buy and the conrad cap and rotor, but I am not sure what are the best coil and spark plug wires that I should buy. Any suggestions?