ECU problems AGAIN (crash course in brain surgery)
alright so a little while ago I replaced my capacitors on the ECU and everything has been running smoothly then all of a sudden ive been having to put a blow dryer on the ECU before I will get the check engine light, due to the fact its been about -7 around here, I was wondering the reason I just breifly read abuot the trick to get it started but I never understood what it does.
Are they ceramic or electrolytic caps?(ive never pulled my jeep's ecu apart but im assuming electrolytic) did you get the polarities correct?? that can make a big difference in any circuit(with electrolytic anyways...)... and what made you switch them out to begin with?
And I'd price around for an ecu, I got one off of ebay from a salvage yard for 175 when i did my 4.0 swap, if you do have to purchase one...
Mans best friend cuz your dog won't keep your jeep from falling apart."
first off i would love to meet up sometime and go wheelin, but yeah on the rebuild i did check the polarities my step brother helped me do it and he is a computer wiz i actually did a write up on this topic but it has backfired on me, but i cant figure it out i know its the capacitors but like im just not sure whats causing these problems besides the cold
double check the solder joints on the caps. A bad solder job will possibly cause issues as the ecu, and the case and the board, and the components, and all the other things involved shrink at different rates due to the temp.
Double check for a grey color at the joints they should also be smooth and have flowed onto the board. If they are lumpy and/or shiny redo them they are probabally no good.
Also, check to make sure none of the traces around the caps were damaged during the replacement. A small scratch in a trace may seperate when it gets cold.
As for why anyone would change the caps themself, I fixed my ecu with bad caps for 4 bucks. If anyone would like I will change theirs for 175.00 and even throw in free shipping. I used the 171.00 leftover to buy my wife a present so that I can spend more on the toys.
Its always a good idea not to bite the hand that can make your life miserable.
Hope to help had the same issue now it is fixed.
"Quitters only get stuck in the same place once"
1993 Grand Cherokee Limited - "Rose"
1994 Wrangler - "White Whale"
2000 Ford F250 Diesel - "Bigfoot"
2000 Ford Excursion V10 - "Hungry"
well i did the same thing replaced the capacitors and it fired right up but its summer time now so hopefully when it gets cold mine dont start having problems i live in northern wisconsin so it gets really cold