Ignition coil soft failure (Page 3/4) Yellow-88 AUG 17, 01:18 PM quote Originally posted by armos: If that resistor failed short, it would have allowed more amperage to pass (limited only by the CTS resistance). Perhaps that could be enough to burn the sensor or wiring. Might also damage the +5V supply further upstream in the ECM that powers the circuit - but you mentioned you have good +5V everywhere else. Thank you. 20 years ago I might go inside and try to fix it but .... it's 30 plus years old and has been mouse pooped on a couple of times. It does make sense that to much amperage could fry a sensor. Rock auto lists a remanufactured one from Blue Streak. Any comments? cartercarbaficionado AUG 17, 02:25 PM quote Originally posted by Yellow-88: Thank you. 20 years ago I might go inside and try to fix it but .... it's 30 plus years old and has been mouse pooped on a couple of times. It does make sense that to much amperage could fry a sensor. Rock auto lists a remanufactured one from Blue Streak. Any comments? they work? that's about all I can say. I have a few dead ones because the reman process is just "eh they function let's refresh the chip and send it" I would keep the old one around still Yellow-88 AUG 17, 04:43 PM quote Originally posted by cartercarbaficionado: they work? that's about all I can say. I have a few dead ones because the reman process is just "eh they function let's refresh the chip and send it" I would keep the old one around still It looks like Blue Streak or Cardone reman is the only one in stock anyware. Lots on Ebay used. New are listed but out of stock or not available. Blues streak is a division of Standard and one of the upper teirs of the corporate stack. I think. ?? As for remanufactured, we know they can be fixed. I'm thinking that this is the only realistic choice because I'm not fixing mine. cartercarbaficionado AUG 18, 03:06 PM quote Originally posted by Yellow-88: It looks like Blue Streak or Cardone reman is the only one in stock anyware. Lots on Ebay used. New are listed but out of stock or not available. Blues streak is a division of Standard and one of the upper teirs of the corporate stack. I think. ?? As for remanufactured, we know they can be fixed. I'm thinking that this is the only realistic choice because I'm not fixing mine. I have a 87 5 speed ecm that's known working on a shelf if you want it. just picked it up for my spare 88 engine and getrag yesterday Yellow-88 AUG 18, 05:26 PM quote Originally posted by cartercarbaficionado: I have a 87 5 speed ecm that's known working on a shelf if you want it. just picked it up for my spare 88 engine and getrag yesterday Thank you but as I turns out, I have one too. Sweetie reminded me that we may have one because our first SE came with an extra one. Sure enough, way in the back of the big drawer along with a MAP labeled "100K good". Yellow runs normally now. I'm surprised that he ran as good as he did considering no input from the engine temp sensor. I wonder if it defaults to some base value if it fails. At some point, a Micro squirt system is the way to go. But for now, I think I want to just do some driving. cartercarbaficionado AUG 19, 07:02 PM quote Originally posted by Yellow-88: Thank you but as I turns out, I have one too. Sweetie reminded me that we may have one because our first SE came with an extra one. Sure enough, way in the back of the big drawer along with a MAP labeled "100K good". Yellow runs normally now. I'm surprised that he ran as good as he did considering no input from the engine temp sensor. I wonder if it defaults to some base value if it fails. At some point, a Micro squirt system is the way to go. But for now, I think I want to just do some driving. it does actually. our 88 doesn't have any functional temp sensors as it turns out....found that out last night when probing the harness and it was just getting poor fuel economy so that solves a ecm mystery Yellow-88 AUG 20, 12:54 AM quote Originally posted by cartercarbaficionado: it does actually. our 88 doesn't have any functional temp sensors as it turns out....found that out last night when probing the harness and it was just getting poor fuel economy so that solves a ecm mystery If you think about it, a default setting of 70 deg inlet air temp and 200 deg engine temp would work fine once everything is warmed up on a typical summer day. Yellow started liking to warm up before we went anyware, a couple of months before he became comatose. I grew up with British sports cars so warm up was a normal part of driving. I figured he was a hard working car and just needed a little time to get it up in the morning. I wonder how long this has been going on. It does make sense that the sensor inputs are just modifying a base map. Just fine tuning it to meet stricter emissions standards and better efficiency. So ... a failed input circuit could default to base and not set a code? Anybody know? Or if an input from either temp sensor is sending a lower or higher value than the actual temperature, than the ECM will just except it as fact and act accordingly. As Patrick points out, if either of the temp sensors are "off" the ECM is getting incorrect info about air density and that effects fuel mixture. I'll add; they can be pretty off, run reasonably well and not set any codes. I do like the idea of checking the resistance values of the two temp sensors if one is seeing a slight "uneasiness" with no codes. So the trick in buying new sensors is to try to get a matched set using ambient air temp resistance readings. Bring the VO to the parts counter. Patrick AUG 20, 03:03 AM quote Originally posted by Yellow-88: I'll add; they can be pretty off, run reasonably well and not set any codes. This probably applies to O2 sensors as well. I wouldn't be surprised if a large number of us (and I'm including myself) are continuing to run O2 sensors that are practically dead... but a trouble code is never set. And we wonder why our gas mileage sucks. Yellow-88 AUG 20, 01:59 PM quote Originally posted by Patrick: This probably applies to O2 sensors as well. I wouldn't be surprised if a large number of us (and I'm including myself) are continuing to run O2 sensors that are practically dead... but a trouble code is never set. And we wonder why our gas mileage sucks. I think you're on to something here. Back in my British Sports Car days we tuned by ear. It was not unusual to pull over and tweak the mixture nuts on the twin SU side draft carburetors if the temperature or altitude changed. If it sounded sharp go one "flat" to rich or if it got flat go one "flat" to lean. Flats referred to the faces of the hex nut locating the jet tube. Also the distributer had a thumb wheel that allowed 5 deg of base timing adjustment. Hard core guys extended that feature to the dash. Having ones exhaust note out of tune was no different than not tuning one's guitar. You get noticed. Now we're at the mercy of a primitive computer and it's sensors and even if we do hear that we're slightly out of tune, there's not much we can do about it. Or is here. ?? Someware in my drawing files, I did one of triple IDF Webbers on the 2.8. I was Just a young guy dreaming. cartercarbaficionado AUG 20, 05:10 PM quote Originally posted by Yellow-88: I think you're on to something here. Back in my British Sports Car days we tuned by ear. It was not unusual to pull over and tweak the mixture nuts on the twin SU side draft carburetors if the temperature or altitude changed. If it sounded sharp go one "flat" to rich or if it got flat go one "flat" to lean. Flats referred to the faces of the hex nut locating the jet tube. Also the distributer had a thumb wheel that allowed 5 deg of base timing adjustment. Hard core guys extended that feature to the dash. Having ones exhaust note out of tune was no different than not tuning one's guitar. You get noticed. Now we're at the mercy of a primitive computer and it's sensors and even if we do hear that we're slightly out of tune, there's not much we can do about it. Or is here. ?? Someware in my drawing files, I did one of triple IDF Webbers on the 2.8. I was Just a young guy dreaming. funnily enough weber 40s do fit. i was a little drunk a few weeks ago and may have started making an adapter plate from the lower intake manifold up because of how fed up i was with my gt fuel injection lol. I ended up not finishing since I found out how expensive weber carbs have gotten but it would have been 1 duel barrel per bank or the idea a friend had was putting 3 duals on and running fuel to all of them and making a plate to open the manifold up to a wide chamber (like a single plane intake) to allow full throttle to have better fuel distribution. thats gonna wait til after he finds out how 2 weber 45s work on their ford focus project and if they can be dailied properly