If the resistance is out of this specification, inspect the condition of the wires leading to the pickup for abrasion, shorting or opens. discussion in the Ford 9N, . The other end of this spark plug wire must remain attached to the ignition coil (this is important!, look at the photo to see how I've done it). The next step is to test the spark plug wire that attaches to the middle tower of the distributor cap for spark. Checking your distributor rotor and cap to see if they need to be replaced is one way to ensure that everything is in solid working order. If you have an account, sign in now to post with your account. Begin the test by removing the distributor cap and rotor to allow easy access to the magnetic pickup. In the more modern M42 engine, this system is replaced by coil packs. ACCEL performance distributor cap and rotor kits offer superior protection from damaging misfires. The reading should be less than 1 ohms. Check the air gap between the reluctor and the magnetic pickup. Inside the cap, if I measure the resistance between the centre screw terminal and the spring-loaded carbon button, I get about 25 ohms. You can post now and register later. The spark arcs across this gap. Without going into a lot of detail at this point. Centre coil connection (exterior) to carbon brush (interior) = 1114 ohms. Place the metal screwdriver near the electrode of the distributor. Then, pull straight out from the cap. the wires enter via the side of the cap and are held in place via screw terminals. Thanks for the feedback everyone. Thanks for the reply, Warren. This will help it to dry faster. Upload or insert images from URL. Then, check the coil itself for potential physical damage. Normal resistance reading from the HV terminal to center carbon button contact should be 3K ohms. Resurrecting this older thread - What should the cap resistance be? 2. however thanks to your question I've now ordered a new cap from Moss Bros. Worry not Steve..at 15,000 volts it will make no difference.. have you measured the resistance of the air gap between the rotor arm and the dizzy post?! 1 - Remove the TFI from . it used to run just fine this way, and the inside of the distributor cap and the rotor looked just fine, hardly any sign of tracking on the contacts. Go to: TEST 3: Testing The Ignition Coil's High Tension Wire. (The new lead I bought for the centre hole is now non-conductive too. GT6 Lucas Distributor cap on Delco D204 Dizzy GT6+ Triumph: 6: Dec 26, 2008: R: Source for Ferrari 328 distributor cap and rotor: Other Cars: 7: May 16, 2008: T: Is the Lucas distributor cap really 3 times better: Triumph: 9: May 4, 2008: Finally got my red distributor cap and spec plate: Triumph: 7: Aug 31, 2006: T: Can I switch from a side to . - Red Skelton), i have no idea what's happened since I fixed it, it has just been sitting on the car. This test is done at the ignition module connector only. I've use multimeter set to resistance test to check continuity of carbon rotor contact.Normal resistance reading from the HV terminal to center carbon button contact should be 3K ohms. Distributor Cap / Rotor Kit / Spark Plug Wire Kit United Ignition Wire 3885. Without knowing how the innards of the cap is set up it is a concern that you (we?) When it is not replaced, the towers on the distributor cap will either oxidize or corrode, creating a high secondary resistance which can result in rotor and ICM (Ignition Control . One of my multimeters gives me a reading of 10.3 ohms, and another fluctuates between 12.5 to 13.9 ohms. Coil Voltage Test #2 - Run Mode. According to the Bentley book, I can test the cap by "checking resistance of cap between tower and its matching contact inside cap. Unplug the electrical connector and the high voltage wire that connects the coil to the distributor. To check the coil secondary resistance, connect an ohmmeter between the rotor button and the BAT terminal. Replace the coil only if the readings in Step 1 and 2 are infinite. The distributor cap should be carefully checked to see that sparks have not been arcing from point to point. Then hold the coil HT wire close to the intended connector hole in the distributor cap and crank the engine to verify that you have spark . Locate the positive (+) wire of the ignition module. I'm replacing the distributor cap and wires on my '75 GMC truck, which is a 350 with a stock large diameter GM HEI distributor. If there is no voltage, the problem is with the ignition switch or the ignition wiring. end to end value = 3k ohms. If the engine suddenly stops running with little or no warning, you may have a failed rotor in the distributor shorting the spark to ground on the the drive shaft. MSD IGNITION www.msdignition.com (915) 857-5200 FAX (915) 857-3344 1. Here are testing instructions for the igntition system components on your engine: Turn the ignition switch in the OFF position and detach the 1-way connector from the bottom of spark control computer. A yellow spark is probably an indication of a bad coil. Put the black wire in the negative coil terminal. To this end, I've measured the resistance within the distributor cap, and have noted something odd. Factory Delivery-Original owner-Retired engineer. which goes from the positive terminal on the coil to the ignition wire in the center of the distributor cap. Is there a way to measure the resistance of the coil to rotor center brush on my aftermarket distributor cap. 2) First, touch the meter positive lead onto the MosFet's 'Gate'. BTW, the plug leads are all 3K ohms, but the coil lead is zero. Would spraying silicone spray on the inside or outside of the cap seal it enough to tell if it had a crack or not. A screwdriver can be used to check the arc when the ignition is turned. Experts recommend that during routine service, when the distributor rotor and cap are replaced, the entire ignition should be inspected to ensure everything else is in good working condition, including the ignition timing. Pull a plug wire off the distributor test each one. Go to the Coil Voltage Test #2. (We just do 'em folks we don't explain them. Pull a plug wire off the distributor test each one. With the high voltage coming out of the coil I wouldn't worry too much about 25 ohms, even though my recall is I got down to 0 ohms. What resistance reading do you get in ohms? Video will show my converted distributor into external ignition coil in replaced with defective built-in ignition coil. Usually a faulty distributor rotor and cap will produce a few symptoms that alert the driver that service may be required. Distributor Cap FAQ How to Test for a Bad Distributor Cap. At this point, I'm following up on anything/everything that doesn't fully make sense. 2. I guess Bently book is wrong if you say 0 resistance can't be obtained. Visually inspect the wires and electrical connectors for corrosion, dirt and physical damage. Location: Manhattan Beach, California. Nearly Zero, WTD??? . Step 5: Dry Out- If you have a compressed air source, apply the compressed air through the cap. The negative wire on the primary circuit runs from the coil to the base of the distributor and . Adjust if necessary to the Step 3. What should the resistance be between the post in the centre of the cap (goes to coil) and the button on the inside? Distributor cap test. ANyone have those values for a 90' 300CE? Go to the Coil Voltage Test #2. . The Solid State Ignition (SSI) system features a solid state Ignition Control Module (ICM)/ignition coil assembly, Electronic Control Unit (ECU), distributor and engine speed sensor. Why would there be a carbon resistance in the center coil tap? If there is no voltage, the problem is in the power switch or in the ignition circuit. A distributor cap and rotor replacement will cost anywhere from $30-$300. My Account My Basket. Record the resistance reading - this is the resistance of the coil's secondary winding . It should not touch the electrode. At these high voltages and relatively high frequency components that bit of resistance doesn't matter. Rotor centre connctor to tip = 984 ohms. If distributor was not converted or original distributor cap . the towers will either oxidize or corrode creating a high secondary resistance which can result in rotor and ICM failure, reduced mileage, CEL illumination, catalytic converter failure or a failed emissions test. With the cap off, crank the engine until the rotor is aimed at a fixed point on the engine or Steve: I concur with John below. First, remove the distributor cap and rotor. The assembly that I'm testing includes the brass female plug in the center of the distributor cap, where the coil wire attaches, and the spring and carbon button combo located in the inside of the distributor cap. Somewhere else here there is a post where I told of problems with the graphite button and its spring in my distributor cap and what I did to fix it up. I would think. Turn the Run key without starting the engine. I'm trying to find an ignition fault, and have ruled out all of the typical causes. So is the rotor. Distributor Caps - Retro Ignition - Lucas Ignition Specialists. Resistance between HTW HV terminal and carbon rotor contact should be 300 ohms. Distributor Cap and Rotor Inspection. By using this site, you agree to the following: Terms of Use. I now have to thank you for asking the question. Step 3. IMHO, a new distributor cap's internal brass contact points should be bare metal for maximum efficiency. Copyright 2022 Holley Performance Products, Inc. All right reserved. Also, it would be brilliant if someone, who's TR4/A is healthy right now, would make the same measurement and let me know! However, if you've all got a similar resistance, and no ignition problems, then clearly this is not the issue. Ensure that you have the finest distributor cap available by using one of these MSD replacement distributor caps. . check out the. $36.88. I tried that and could not get a stable reading. Pelican Parts Catalog for Porsche, BMW, Mercedes-Benz, MINI and More. 2 Attach the HEI spark tester to this wire. Display as a link instead, Then connect the ohmmeter between the ground terminal and the rotor button. These distributors must be used with an MSD Ignition Control such as a 6-Series Ignition or a 7-Series Ignition. Carefully move it out of the way to allow plenty of working room for the next phase of the test. I had replaced everything: cap, condenser, points, coil and ignition wires. All Activity. The BERU Distributor Rotors feature: Insulating, high voltage resistant material similar to the distributor caps; With/without 1 kOhm 5 kOhm interference suppression resistor, depending on manufacturers' requirements; With/without speed governing, depending on manufacturers' requirements; System-specific push-fit or screw attachment. If it has a four wire connector on the distributor unplug it and splice the green and black wires on the distributor side. A SPARK PLUG WIRE RESISTANCE TEST will check the spark plug conductor or coil wire conductor. Internal resistance - distributor cap - TR4/4A Forum - TR Register Forum. . Parts are just part of what we do. I'm pretty sure I'm using the Multi-Tester correctly. Loaded voltage test; Ground test; How do I find a Resistor wire; . The following test will determine if your MSD is producing a spark. 3 The resistance of that carbon brush is insignificant. Your link has been automatically embedded. Put the metal part of a screwdriver against the metal of the plug wire. The Ford style cap features more area between the terminals, lessening the chance of crossfire. The caps I have are working; this is really just about clarifying what the Porsche and Bentley manuals say. On the new Bosch cap, they're coated with lacquer, just like a brass bathroom fixture would be. CASE 3: You got spark on some BUT NOT all of the spark plug wires. Unscrew the mounting bolts to remove the ignition coil from the vehicle. Pull out the carbon and spring and check it. You can also use a clean rug and carefully rub it until the cap is completely dry. Way back in the late '60s with my 1965 TR4, I had a misfire that I just could not diagnose. Using msd6l box. 1st test- primary resistance, tach to bat terminals is near zero - pass 2nd test - secondary resistance, rotor button to ground - 15k - pass 3rd test . Free shipping. The cap, which is a reproduction on a vintage car, has melted and I think the resistance is too high, but can't seem to get an accurate reading. This will bypass the electronic spark controller. The plug leads are exactly as expected. Other components include the battery, ignition switch, starter solenoid, spark plugs and wires, cap and rotor, resistance wire, by-pass wire and a knock sensor. 5 or 6 thousand Ohms will make no measurable difference to the spark at the plug.. you need to look elsewhere for your fault I suspect. Use an ohm meter to check the resistance of the wires. 5 Determine whether the readings you recorded fall within your vehicle's specifications. Between the two terminals should be less then 1 ohm (0.35-0.60) From the small stud to the center secondary tower around 8K to 13K ohm. Engine misfires can occur for a number of reasons. the old plugs, however were very black and greasy . Resistance should be nearly zero ohms.". Remove the coil wire from the distributor cap. $44.33. Distributor cap, testing ^ To test cap and rotor, use flat-tipped screwdriver to press down and turn cap hold down pins Vt turn each. No, the spring-loaded carbon rubbing block in the center of the cap. No takers? V8 124 Forum Click Here. The primary coil resistance should be less than 1.0 ohm (zero or nearly zero). Share. I'm experiencing intermittent drop in idling rpm and found out that my distributor cap rotor carbon contact was already defective. A screwdriver can be used to check the arc . Also make sure that the cap you are using is a true MSD distributor cap with brass terminals and not aluminum. The cross firing due to a short as would result when the cap is cracked would also be evident by the engine back firing. Attach an 18 or 20 AWG jumper wire from the negative coil terminal to an engine ground. Throw $$ at it and build up a potential stockpile of parts, in this case distributor caps. Remove the existing distributor cap without disconnecting any of the spark plug wires. 1. To perform a wire resistance test, . Thanks for the feedback everyone. Detach wiring connector from cap. You can use a test light, a spark tester or a voltage meter in this step. Please familiarise yourself with our Terms and Conditions. The ignition in most E30 engines ( M10, M20 and M40) is a standard coil -based system whereby a large electric voltage is generated and sent to each cylinder in turn by a mechanical distributor. I usually check the OHMs on the Rotor, if bad I replace as a pair. If you have a clip down distributor cap it will take part number: 1581. I use a multimeter, a. A very high resistance will cause intermittent drop in rpm or hard starting of engine. Find MSD Replacement Distributor Caps and get Free Shipping on Orders Over $99 at Summit Racing! However, if you've all got a similar resistance, and no ignition problems, then clearly this is not the issue. i think so too, no need to measure the cap ..i have never done ..never had a reason;-) put it on and drive..specially new cap as said above. Set the multimeter to Ohms mode and check the reading. Mercedes Benz Expert, factory trained, retired. The Wells Vehicle Electronics distributor cap receives high secondary current from the rotor and the coil; each ignition wire is connected to the cap and those wires complete the current path to the spark plug. Special Cap-A-Dapt kits, available from MSD Performance, include a cap, rotor and special cap adapter that allow installing a Ford-style cap on a GM or Chrysler distributor. Test battery ground connection with a multi-meter set on volts D.C. 3 / 4. . I show how to test your entire ignition system including the spark plugs, spark plug wires, ignition control module, and ignition coil. Connect an ohmmeter between distributor cap terminals "TACH" and "BAT" to test the ignition coil's primary coil. Kits are offered with fixed (MSD8445) or adjustable (MSD8420) rotors. Measured the resistance of the distruibutor cap. You can also check your distributor arc with a metal screwdriver by making contact with the distributor electrical plugs. I don't know this for a fact but I do not believe the rotor actually makes "solid" contact with the contacts on the distributor cap itself rather its comes close and that is why old caps and rotors have burnt marks from arcing. Hey Doc, check OHMs on ref & speed sensor. Engine misfires. It is the Readers Digest of car stuff. Spark plug wires held out the longest, with a recommended change at around 90,000 miles (144,841 kilometers). . To test the distributor, you'll need a multimeter. TESTING For A FAILED ROTOR - IG-111C. Powered by Invision Community. Clear editor. This was what initially concerned me. Distributor Cap / Rotor Kit / Spark Plug Wire Kit-FI United Ignition Wire 3842. You can use the INNOVA 3320 to test the sparks and electrical current of your distributor coils. The spark should as large (current and volatge) as possible). They're designed with performance in mind, are molded from a high-quality, voltage-insulating material, and use low-resistance terminals for maximum conductivity . If you have a screw down distributor cap you will need part number: 1582. Shop for Duralast Distributor Cap DR926 with confidence at AutoZone.com. If you are an optimist, 0.4999 would be nearly Zero right or would that be nearer to zero??? High-output racing ignition systems place severe demands on these components, and that's why ACCEL makes sure these kits provide optimal shielding against damage. This page was generated at 04:22 AM. By SteveHall, September 2, 2009 in TR4/4A Forum. This price includes both the parts and labor. In addition to the test above, you may elect to perform an ignition . To get the primary coil reading I am putting both leads from tester into the coil lead slots (dial on tester set to 200). Following ohms law (I=E/R), spark voltage should remain unchanged, but spark current should drop by a large factor. Turn the ignition switch ON. Checking The MSD Ignition For Spark. 2021 TR Register (TR Owners Club Limited) MALLORY IGNITION www.malloryracing.com 1 TO CHECK: 1. 1 - Fully apply the parking brake. Certainly the voltages used in the system are great enough to overcome a lot a minor barriars like small gaps etc.

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