Mercruiser bad ecm. Bravo 3 package with freshwater cooling (half system).

• Mercruiser bad ecm 7L EFI). It idles fine, runs great at mid-range rpm (3000-3800), runs great at higher rpm (3800+) occasionally if engine is cool. At that point, I thought there was no question it was a bad ECM or relay. My Mercury ECM Part #861926T3 no longer available. If you want to work on an EFI system, you MUST HAVE a scan tool. if the ICM goes bad, it simply stops working and the engine quits running. Dec 14, 2018 · Bought the boat in fall, and have failed two Ignition Control Modules (ICM, Mercruiser P/N 8610460-1) now on the same engine. I am sure there is more damage to other engine functions caused by this Find a loaner known good ECM. Jul 23, 2007 · It will read any active fault codes from the ECM, the last 10 faults kept in the ECM history, real time operating data like RPM's, oil pressure, etc. com and the OBD2AllInOne site. my motor is 2003 6. Once the engine warms up, if you try to maintain an rpm higher than 4000 it starts cutting out. I also believe "Authorized Mercruiser Premier Service Center" does not mean very much. The next day it did not start. Jun 27, 2015 · Hello, long time reader of these forums, finally had to stop piggybacking and contribute to the conversations. To test his theory he swapped the good ECM from his other engine, and cooked that as well because the ECM wasn't the cause, but the result of a bad IAC. A couple of years ago one of our members had a problem with one of his 8. All faults are stored in the ECU memory and will put the ECU into the reduced power mode which reduces the pulse width to the injectors. Repair & Return **THIS IS NOT FOR A BOAT OR BOAT MOTOR** SIA Electronics has many other repairs available. (800)737-0915 This is a repair & return for your Mercury Mariner ECM ECU PCM. Just do not drive the Aug 14, 2012 · Re: mercruiser ignition control module? with a carb, the ECM controls ignition advance, knock control, rev limiter, and shift interupt with an alfa drive. So here's the deal: I purchased a new project with a 2003 5. Jun 20, 2010 · 1. Mar 19, 2021 · ECM was sent to Whipple Superchargers out of Fresno California. 0 alpha mercruiser ecm problem Unfortunately mercnet won't really help with finding out exactly what any of them numbers really mean, I know mercruiser tech support has a list there to tell them what all those numbers mean exactly and how to read them and cross reference etc, We just get to know the basic information of what the numbers represent from the service manuals, etc. If the wires are bad, well, you know what happens. Mar 19, 2021 · ECM was sent to Whipple Superchargers out of Fresno California. It doesn't seem to backfire, it doesn't drop ECM 555 Computer Re-Calibration & Monitoring (ECU) - 496 Mag and HO, 525 Non Supercharged Engines. Was thinking possibly convert to carburettor if I can't get hold of 4b ecu. Mercury Mariner ECM ECU PCM. . Others have said it's cheaper to buy a whole new up to date ignition. Connected a graphing/recording multimeter to the power supply for both, when the problem occurred there was no interruption of power. Mar 30, 2009 · Injector sizes have to match the ECU. Mercruiser 5. Nov 8, 2020 · Does your engine have a Mercruiser Thunderbolt ignition? Are you sure it's bad? It could just be the sensor in the distributor--cheap and easy to replace. Apr 26, 2010 · My Mercruiser ECM went south. call a good shop that has the laptop diagnostic computer for the mercruiser(not the scan box) pay them the 125. then order the sensor from perfprotech. Upon taking a peek, it was determined that the portion within the ECM wasn't receiving a signal from the crank sensor thus the motor does not know when to fire. 0 EFI 2001 with Idle problems Have replaced parts, TPS,Map and IAC and also switched ECM since I have Twins and no luck Apr 7, 2020 · I am also leaning towards you ECM being the culprit. They cost $399 with a 496 adapter to plug it into the engine. If the Thunderbolt ECM is bad I hear they are quite expensive. We had ECM failure this year. If it's on crooked and one side is higher than the other, the spark won't get to the plug wire. Oct 23, 2012 · It appears the faulty coil was the root cause, possibly causing incorrect voltage. Further note that the 16237009 confirms this is a MEFI-3 ECM by the Rinda connections documents, tunertools. Jan 30, 2019 · Check the 5v reference voltage output from the ECM. With the scan tool, you have to clear the stored faults and then reset the ECU to full output. I'll be organizing this and helping you find everything about the MEFI-3 controller (will expand this as resources are available). 2LMX/Bravo III EFI set up which are common to many Searay Models/years. It cranks but the engine does not start. My unit was built by Delphi Automotive Services, Kokomo, IN with part number 16236999 it has a bar code 833999KA00037571 (I think the first 8 digits are model, the last 8 are the serial number for this unit). tell them you are doing the repairs you just want the print out. That also makes wonder about the IAC you A bad Switchbox or Stator would be the top suspects. 1s. Read the print out that tells exactly what sensor is bad. 7 350 mag mpi serial# 0m663930 (I'll confirm serial when I get back to the boat) bravo 2 drive. Their opinion on hearing all the details was possibly moisture in the ECM or a bad harness/connection. Any idea's/comments please. 2. 2 horizon bravo FWC, the ECM i got is from a 2005 6. I found these when researching my Mercruiser 6. I am leaning towards connection but thought $50 was cheap reassurance on ECM. com in florida. Good luck. Mercury Mariner Engine Computer. Others who know more than me please add/chime in because I am not an expert on the triple nickel ECM (or ECM-555). Hooked up the ECM from Port side and everything works. Mar 17, 2005 · Wiggled, poked, twisted, shook, tapped, you name it, I did it. Oct 14, 2015 · Situation: ECM (sent to OBD and confirmed its toasted) Boat: 2000 Shamrock 246 wa Engine: 5. Jul 31, 2013 · Re: mercruiser 5. I docked the boat and turned off the engine. He replaced my original ecm (delco model 16234539) with another he had in his shop (delco model 16189069) just to have it in the water during the summer. 0 MPI fuel pump issue(s) Hi there, no there is no pressure switch that shuts off the electric fuel pumps, that is controlled by the ECM. Feb 23, 2012 · Re: 2005 5. ECM Repair | ECU Repair | PCM Repair [Pictured is a Mercruiser Marine ECM 555] Do you have a marine, commercial, or industrial ECM (electronic control module) that you know is broken? We might be able to salvage it! Aug 12, 2012 · It uses a ECM 555 as the computer controller to run the engine. Apr 11, 2012 · You can quickly make matters worse. 2 Bravo ) and works fine we check all wiring on my motor and is fine ( i have twins so i swaped the ECM and the engine runs perfect ) the only thing that will preven the engine from runing i think is that the ECU is searching for the signal for the pick up coil or cam sensor Needing a tune-up and suspecting the ECM/ICM doesn't make any sense. Mar 9, 2023 · in 2009 we installed Mercruiser 383 MAG MPI in our boat. Oct 10, 2012 · Lost my Tact last year and through process of elimination I have determined that the ECM is bad on my Starboard side. After testing, I was told by my mechanic that I need a new ECM (motor is a MCM 5. The ECM does not have to be for a 5. I think seller added heat exchanger. WARNING! Oct 12, 2023 · Mercruiser Sterndrive Forum . My mefi4b is bad beyond repair and chaparral been sitting there since October 24 with no end sight. Subject: Mercruiser MEFI-3 ECM Delphi 16237009 Posted on: 08/12/2007 12:17:58 Message: Mercruiser MEFI-3 ECM Delphi 16237009 This topic is under development and really only scratching the tip of the iceberg. " Jun 3, 2021 · Some of this information I have gained from other forums and some by experience. I thought that the ECM or main power relay MUST be losing power. 7l plus EFI (350cid) This inboard engine says seamaxx on it. All it takes is one bad sensor to load that down and cause the others to not work. any 555 ecm will work Alpha or Bravo, 5. The key for me is that when an "Authorized Mercruiser Premier Service Center" and "Mercury" tells you the only fix is to replace the ECM, run the other way. If the 5vdc output is still bad after disconnecting all sensors, then yes the ECM repair shop can fix that relatively easily. The part I need exactly is a MEFI 3 Delphi ECM model number 16237009 but a member on these forums has told me that he has a MEFI 3 Delphi ECM but its model number is 16236999. If there are only two cylinders affected that are phased 180 degrees apart (cylinders 1-4, 2-5, or 3-6) then it is possibly a bad trigger. Bravo 3 package with freshwater cooling (half system). Does anyone know if these can be repaired? New ones are over a grand. Mar 5, 2021 · Have about three hours on it and couldn’t make it die. 0 to 383. the black flakes in the fuel would be my guess as the cause of your problems. 2 FWC bravo, we tried on my friends boat ( 2007 6. 0 to test. First was on maiden cruise back to my port, about halfway there, lost power, no spark, turned out to be the ICM. *LIFETIME WARRANTY *Free return shipping *Fast turnaround time Dec 24, 2021 · New to this forum, proud owner of a Chris Craft Scorpion 210 with a mercruiser 350. Also i recommend getting the Mercruiser PCM-555 Diagnostics manual for troubleshooting faults with or without a scantool. Nov 5, 2013 · If all the ohms checking checks out okay except the scan tool won't change state then send the ECM out for inspection as swapping ECM's with a unidentified failed component or wire could be disastrous at times. I launched the boat today only to find out that it won't run under load. No beep and no fuel pump prime at ignition. Originally, in neutral, seemed to be perfect, but in gear, once up to 3000rpm or so, starts missing and stumbling so bad it won't accelerate. 00. Jun 2, 2014 · Have a 2001 Baja with a 496HO. If it is only two cylinders that are paired together as 1-2, 3-4, or 5-6, then it could be a bad ECU, a bad Coil, a bad Switchbox, a bad harness. Runs like a champ for a Aug 12, 2007 · Here are pictures of the back of a Mercruiser MEFI-3 ECM: (DELPHI 16237009 with barcode 867009KA00017257) The side of this ECM has a F02D marked on it; this is the calibration checksum for this ECU in Hex. What year is the boat, how long have you owned it, what has been serviced, etc? Make sure the distributor cap is on correctly. He thought he had a bad ECM (he did). Judging by your description, it sounds like you may have either a loose or corroded ground or power wire/cable somewhere such as the battery or on the engine wiring harness or connector. I have seen an IAC with the plug melted on it from a bad ECM. Have sent ECM to company in San Diego for a $50 function check. You'll have a new distributor, wires, coil etc. Works with Mercruiser applications ONLY. Jul 23, 2022 · Just wondering how everyone has managed with bad ecu. Everything works except for the Tact. dguit geuxe jihqxj ortpl ombrrt kflmztw pom hdckd bmi uid isaiw fhban itjkqv tbjpvf nmioe