Outboards, Shop Put a timing light on the #1 wire and had no light. Connect timing light (91-99379 or similar) to No. The next step is to use the wires to bypass the ignition module by hotwiring the car. He is an ASE certified technician with an across-the-board experience of 10 years in the industry. ACCOUNT, Find Holders, Cabin Accessories & Boat, Boat Buyers terminal. Furthermore, the engine may behave unpredictably, causing accidents and other hazardous situations. I consider this to be one of the most valuable videos Ive produced on my channel because of the millions of Mercruiser Thunderbolt Ignitions waiting to fail. However, its important to be careful and get professional help if youre thinking about bypassing the ICM. Shelters, Boat The best source for Mercruiser OEM parts, marine engines, boat & engine Deals, Dealer But, it is important to use it. Anchor Box Anchors, Fishing Rod & Reel Wells, Toilet & Waste Not sure what ignition system or the year that you have but follow the link below for Thunderbolt IV. Maintenance, Boat Cleaners & Yea, the sensor seems to be the majority of ignition issues I see. Use Quicksilver 91-818812A1, or fabricate a jumper wire using a 6 in. Thunderbolt IV ignition problem - Offshoreonly.com Identifying the Type of Thunderbolt IV Module A bad battery can make your car not start when you ignite it. NOTE: Before starting engine make sure the timing tab and mark, or marks, on crankshaft damper are clean. Forums, Find To check if the bypass was successful, attempt to start the engine after reconnecting the battery. 7. 2. Two items of test equipment are required: an inductive pickup timing light and one of either a Scan Tool, Marine Diagnostic Code Tool or MerCruiser Special Timing Tool (Quicksilver 91-805747A1). Deals, Boat Seats You can then bypass the ignition control module and start your car by inserting the screwdriver and starting the car with it. Ski, Wakeboard Breakers, Power Packs & Jump Refer to Specifications Engine Rotation and Firing Order for cylinder numbering and location. Attempting to fix the ignition system on your own can result in permanent damage to your car or injuries to you or others. IE, have you actually tested for spark at the plug wires? Software, Digital Its getting fuel but has no spark. Enjoy banner ad-free browsing with Powerboat Forums at SpeedWake Plus. Disconnect the MerCruiser Special Timing Tool from the DLC connector. Thanks for the help. Plumbing, Anchor Engine still runs great and cruises 18 to 20 knots at only 3000 rpm. It may not display this or other websites correctly. Parts, Sacrificial Anodes & Tubes, Shop Hardware, Boat Cabin 1. Marine Battery Chargers, Shop Fasteners, Boat Windshield Additionally, some ICMs have built-in features like knock sensors and rev limiters, which help to protect the engine from damage caused by detonation or over-revving. How do you identify the wires to bypass the ignition switch if you dont have the car keys? If there is no voltage look for a bad connection or blown fuse feeding the coil. Dock, Cabin and 9. Rafts, Paddle Refer to Specifications. 6. Manufacturer, Boat Tables &

I have logged 200 hours and still have not changed the plug wires, distributor cap, and all those inside the cap. The only difference is youll set the base timing to a different value and Ill show you how to do that in part 5. 3. Oars, Wakeboard, Wakesurf & Handles, Life Jackets & : If ICM is not working properly, it can cause the engine to occasionally lose or completely fail to produce a spark. I now sell the entire kit with genuine GM electronics. Has anyone replaced the thunderbolt V ignition with an MSD ignition or even one of the delco set ups? Locks, Boat Deck On Alpha applications, the shift interrupter switch can also short out the ign system. Charts & On 350 Mag MPI Model, engine RPM will automatically increase to a higher RPM. Turn ignition key to OFF position. Platforms, Slide Connect a shop tachometer to engine. Tops, Bimini Top NOTE: Before starting engine make sure the timing tab and mark on damper are clean. Software, Digital These can damage your vehicles electrical system severely. Furniture, Boat Seat Pedestals & Thought it was the ignition sensor but swapped that out and still no spark. & Live Bait Accessories, Marine Electrical You can either use a portable jump starter or another car to jump-start your car. Detectors, Binoculars & Aim timing light at timing tab and recheck location of timing mark. Torque distributor hold down bolt to 20 lb. First step is to disconnect the tach. Boats, Propeller Parts & I am also noticing the volt gauge and tach are acting "jittery". Covers, Boat Wiring & When I was trimming the same side lower unit the gauger was not working or bouncing around and not giving a accurate reading. It should bypass the ignition control module and start the car. So that pretty much means it's gonna be the Module. Remove timing light. Signals from the engines sensors are received and processed by the ICM to decide the best timing and duration of the spark that will ignite the fuel. Manual however does not state it has to be perfect 12. Marble, Engine Plumbing, Fresh Water Boat Towers, Tow Ropes & This page was generated at 01:18 PM. parts, accessories, boating supplies, tools, & aquatic sporting Riptide Terrova 80 Trolling Motor w/i-Pilot & Bluetooth, Inflatable Tops, Bimini Top Rafts, Paddle Replacement Thunderbolt IV ignition control modules (ICMs) no longer come with the adapter harness (15275A1). Our port engine sputtered and died a few weeks ago. However, if problems persist, its best to consult a professional mechanic or auto electrician for diagnosis and repair. After many months of not running, it couldn't generate spark. Once the cable is loose, remove it from the battery terminal and keep it aside. Protection, Dock Storage & Such issues can cause long-lasting damage to your vehicle and even pose safety hazards. Parts, Boat Tubing & Due to the number of wires contained inside, you may find this process a bit tricky. Savers, Boat Trailer Guides & Honda 5hp Outboard, Boat Axles, Boat Trailer Tie Pumps, Marine Pump Replacement Boats, Propeller Parts & The engine compartment usually houses the ICM, which is a small, rectangular-shaped component with several wires connecting to it. I will work on this whole tune up process just before I make my last launch. In case you suspect issues with the ICM of your vehicle, it is advisable to seek professional help from a mechanic or auto electrician to diagnose and fix the problem. To bypass the ignition control module in your vehicle, you can follow these steps: connect the positive terminal of the battery to the positive side of the ignition coil, locate the starter solenoid and connect it to the positive terminal of the battery, unplug the ignition switch wire from the solenoid, and then short the solenoids terminal where the ignition switch connects. It should read 12 volts. 6. Next, you need to test the other wires at 0V again. Screws, Boat Handles, Pulls, Check for voltage at the positive side of the coil (white wire with red stripe I believe), if you have voltage then follow the test. If you bypass the ICM, it can result in serious harm to your vehicles ignition system. Even small changes to the ignition system can lead to injury. Login, Boats Get several, keep spares and change the trigger. If your not getting spark at the coil wire end either then your problem is elsewhere. It activates the solenoid and makes the starter crank the car. It's carbed. This will help achieve better performance or comply with racing regulations. AN Nonetheless, there may be circumstances that necessitate bypassing it. To remedy this issue you must follow the procedure in Part 4b of this series to replace the thermistor with a temperature switch, Mercruiser part 48952. Protection, Ladders, Steps, & Login, Boats Furthermore, it is important to identify and rectify any ignition-related problems before considering bypassing the ICM. You can find the ignition switch that contains the wires by removing the plastic cover in the steering column. Thats why its best to consult a qualified mechanic or auto electrician in case of any ignition-related problems, prioritizing safety and accuracy when carrying out maintenance or repairs on your vehicle. Fishing Lures, Fishing Rod Holders & To make sure that the symptoms you are experiencing are caused by a bad ICM, its crucial to have a professional mechanic or auto-electrician diagnose the problem. 12. IMPORTANT: Adapter harness (15275A1) is no longer available from the manufacturer. I did a tune up on my '89 with a 350. Savers, Boat Trailer Guides & Chalk or white paint on timing mark on damper may help visibility. I have confirmed the coil is good, but I suspect either the ign. It involves more than tearing wires from the steering column and touching or twisting them together to ignite a vehicle. First, identify the red coil wire to bypass the ignition control module. Tubes, Shop