Quote:
Originally Posted by rfmaster
Well, if it helps I am scratching the back of my head as well. FWIW it has signs of electrical intermittent. Assuming that ECM is not capturing any fault codes it might be subtle, heat related fault.
Check EGR - stuck or leaky EGR will effect idle.
Check MAP sensor.
Distributor reluctor coil and ICM
//RF
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You, me, and everyone else whose looked at it. Im about to pull my hair out. There are no fault codes in the ecm. I even tried swapping out the ecm with both my extra 87 truck ecm and my 92 buick roadmasters 350 ecm and other than cold start was quicker on the 87 truck ecm all other results were the same. Its strange that at times i can cold start it and it will run 1-2 mins then die and other times i can cold start it and it will run for 30-45 mins then die.
I will recheck the egr. I pulled it off and checked it 4 days before the dying started and the
egr was clean and seated. So i reinstalled it and plugged off the vacuum to make sure the
solenoid wasnt leakin vacuum or sticking. I forgot to reconnect it to the egr and it was still
plugged off the day the dying started. Ive reconnected it since then but that made no
change. Is there a way to check the map sensor without a scan tool? I had my laptop connected using my aldl datalogger and we didnt see anything strange in the map readings however this was before the dying started. It has the msd billet distributo in it an I had installed a new pickup and icm almost 3 months ago now because of a hard start issue. Even though the old pickup and icm were heavily rusted installing the new one made no change then for the hot hard start. Unfortunately msd soldered the wires to the icm on the replacement kit so i cant just pull the icm and have it tested. Im tempted to go get a used distributor and splice in the connector and put so i can remove the icm if needed and install replacent icms instead of the whole thing. Wish i had an extra distributor too to try just to see. I am taking thursday and friday off and the plan is to focus atleast one if not two days of the fourday weekend just on the truck. Ill be glad to put more than just 1-2 hours at a time or day to work on it and maybe get this problem solved.