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Rich, I'm confused by a "denser charge", what does that mean?
that is a great explanation Rich. thank you.87becky did you by chance use the new dielectric grease on the ICM when you replaced it?
I hate to sound like a broken record, but on a Chevy TBI engine, the timing needs to be at ZERO. Having the timing advanced or retarded will cause problems, including hesitation, bogging or even misfire. Unplug the tan/black wire, time the engine to ZERO degrees and reconnect the tan/black wire.
Quote from: dvdswan on April 20, 2014, 01:04:02 PMthat is a great explanation Rich. thank you.87becky did you by chance use the new dielectric grease on the ICM when you replaced it?I applied the special heat paste that was supplied with the new ICM but no dielectric grease. I'll be sure to apply some when I'm working on it next
...They were spliced as if there were some type of connectors on them.... I don't wanna say they broke but more as pulled out of something cause they were spliced....
As long as the base timing is between TDC and 6° BTDC, and the engine doesn't ping, timing isn't likely an issue. There is no crank or cam position sensor on this motor, hence the timing map is merely offset by the amount of base timing. If the engine becomes over advanced to the point of detonation, knock will cause EST to retard the timing and degrade engine output.Does the SES light in the dash illuminate when the ignition is first switched on? Are there any trouble codes stored? Have you checked fuel pressure? When was the last time the fuel filter was replaced? Does the truck still have its catalytic converter? Pull the plug wires off the distributor cap and coil and look up inside the boots. Do any of them appear sooty or discolored? Do the same thing at the spark plug ends.Ok, so today I got to get sometime with the truck and I found a few things. nothing major but good to know. SES light does come on when first switched on. No trouble codes stored. fuel pressure could be a possibility but I wanna say its not cause it can supply fuel up to 4000 rpm. Ive reved it more in the past with the set up I have so its not likely fuel pressure but I will be testing that soon. fuel filter was replaced when I put this pump in about 6-8 months ago. the wires are fine but it may be possible theyre breaking down inside but they are fairly new and ill be checking that tomorrow. I unhooked the egr line and nothing changed or made a difference. The two wires are solid black. As I was told solide black is just ground. so to day I put them together and grounded them out to the blok. before this my truck was running in an open loop with the O2 sensor running lean and O2 crossings weren't up where they should be. once I grounded these wires everything was normal and in perfect order. the truck is still doing what it has been doing. since I bout a ICM from autozone im going to a GM dealership to buy a good one. ill also be testing the module I have at the auto parts store to see what it does. I tried posting the pic for the wires but I cant get it to work