Tach and Dwell Meter

The following instructions are for creating a MegaSquirt to Relay Board cable. It is for those who are creating their own harness. With both boxes mounted, measure the distance between them from DB connector to DB connector – this will be the length that you will cut the individual wires. If you are not using a Relay Board, allow enough length in each of your wires to reach the target component. It is often better to be too long and trim afterwards, than to be too short and have to splice additional lengths on. For a Relay Board cable, you can move both heat shrink pieces to the center of the wire length, and then twisting the center of the wire with a few twists to hold the heat shrink in place, so that it does not fall off the wire or run down while soldering the connection.

carb adjusment with a 3 in 1 dwell meter with a tach built in

Fine Tuning It’s a diagnostic plug that leads to a sensor at the rear of the case behind cylinder 1 called the TDC marker unit. It’s an inductive pickup that produces a signal when each of two dowels attached to the back of the flywheel pass the sensor and it’s used for measuring the engine timing electronically. My apologies that you had to look at that GEX sticker for even half a second.

Luckily that engine isn’t mine and hopefully it’s not yours either. The plug has a 3 prong male connector and is shown in the baywindow bus fiche as item 32 in illustration 94

Jul 13,  · Yes, There are hand held tach/dwell meters that will work for 1, 2, or 3 cylinders. You might have seen meters made for 6 and 8 cylinders with instructions on how to use to read a 4 cyl engine. Similar compensation can be made for other numbers of cylinders.

My symptoms are no power to speak of below rpm. At that point turbo boost occurs and power comes up, though no where near what it should be. The engine revs smoothly but runs out of steam before rpm. I’m left to decide if the problem is the AMM or the O2 sensor. If your B FT throws oil around like mine, the throttle body can easily get crudded up and cause problems exactly as you described. All these were fine, just a dirty throttle body caused the problem.

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Check the serial cable and serial circuit. You need to ensure that you cable is straight-through and not a null modem cable, as well as that it doesn’t have other functional problems. For the V3 main board, the instructions are in step 26 g-h.

The tach connector provided will work with your old tach/dwell meter. There are no points but the principle is the same, one rise and fall per spark on the four cylinder scale. Just shove a paper clip in the tack port and hook up the rpm lead from your old meter.

Wasted spark with multiple coils It can also support coil per plug in some installs. For wasted spark you require a minimum of single “missing tooth” crank wheel, only engines with an even number of cylinders being supported. You need at least for 4cyl, for 6cyl or for 8cyl. However, the wheel is probably the easiest to obtain. The MS ECU can drive up to 6 seperate spark outputs, meaning it can run up to a 12 cylinder in wasted spark mode.

For a distributor based setup with a trigger wheel, simply follow all of the wheel decoder instructions but rather than setting SparkB, C, etc as outputs as in a wasted spark setup only set LED17 as SparkA output and ensure all other spark outs are NOT set: The downside is that it is more difficult than EDIS and requires extra software settings. If you are buying a pre-assembled Megasquirt your vendor will be able to do this for you.

Before setting up the wheel decoder, several questions should be asked: This matters because the camshaft turns half a revolution for every crank revolution. This will also help determine how to set things up later. When you have all this information, you’re at least ready to start. Where to mount the sensor and wheel Lets asume your going to change a distributor based setup over to a wasted spark coil pack setup.

Tach and dwell meter Page: 1

The transmission was rebuilt and it changes smoothly under load but is a bit lumpy from neutral into reverse or forward and at lower speeds. Also excuse my ignorance but the transmission positions are of course low, then drive green dot and lastly a white solid dot. Is that the way it should also be? Many thanks for your advice.

Jul 29,  · Best Answer: You forgot to mention strobe, well in points and condener ingnition, you first need to know the timing, how many degrees before top dead center, and the reccommended dwell, attach the pos to the coil and ground the other lead, mark the timing mark on the harmonic balancer with white out or chalk, dissconnect the vacuum advance, advance the throttle to to rpm, adjust Status: Resolved.

My Haynes manual tells me pretty clearly how to adjust the dwell. According to old Chilton manual, black. A tach- dwell meter is a combination electronic device that measures engine rpm as a tachometer and ignition point dwell. I purchased a Sears dwell tach meter and it has 2 leads. I can get the tach to work by hooking blk to neg and red to the coil. What is the hookup.

How to Hook Up a Tach Dwell Meter

Designed utilizing the finest materials, it delivers unmatched levels of durability and Dorman offers a comprehensive line of Electrical Multi-Testers for almost any automotive repair. All our Electrical Multi-Testers are constructed of high-quality materials for long-lasting durability. This professional level digital multimeter and engine Analyzer performs all standard electrical tests for on-car and bench troubleshooting, including tach, dwell, volts, ohms and diode Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which makes it the perfect deal for your ultimate satisfaction.

The OEM Videoscope with 2.

Certain questions come up all the time on the various discussion boards, particularly theSamba’spopular Baywindow is a FAQ made up from my replies to those topics and from some others in no particular order to get new owners up to speed.

Would you like to merge this question into it? MERGE already exists as an alternate of this question. Would you like to make it the primary and merge this question into it? MERGE exists and is an alternate of. Merge this question into Split and merge into it SAVE In DIY Projects , American Cars The one of the leads usually the red or positive goes to the negative side of the coil the side where the distributor wire connects and the other lead usually the black or negative to any ground source.

The washing machine outlet should be ground fault protected on wire. The 30 amp dryer circuit should be on wire with a ground.. GFCI required if re…ceptacle is within 6 feet of sink or duplex receptacle rather than single receptacle [but a GFCI isn’t a bad idea anyway

how to use handheld tach

Page 2 of 3 [ 31 posts Go to page Previous 1, 2, 3 Next 90 days before it turns up in dearborn’s inventory. Actron Timing Light Instructions Sunpro direct hook up timing light by actron. Sun Inductive Analyzer at Amazon. Johnson Outboard Tach Forum Topics.

Apr 04,  · All I am asking is how you hooked up a dwell meter to a carb, simple question to someone that stated he used a dwell meter to set a carb. Pioneerguy pioneerguy, Apr 3,

The problem is that people fit voltmeters wired to the green circuit, which can be a couple of volts lower than the solenoid i. It’s battery voltage which is important, and any volt-drop between there and the green circuit is down to ageing connections, and the best alternator in the world isn’t going to cure them, although it may cover them up. This was the case in the 5-pin 2-plug 16ACR from 69 to Initially the 3-pin single-plug alternators used machine sensing i.

This is a ‘2-wire’ alternator. Clausager states that a new version of the 16ACR with modified regulator and surge protection was provided in March Possibly because of problems with low battery voltage, in the alternators seem to have reverted to battery sensing again Clausager states the 17ACR was fitted from February 73 now with an additional thin brown in the alternator plug wired back to the solenoid as before, and this seems to have remained the case up to and including the 77 model year at least.

Wiring and Sensors

How to Use a Tach Dwell Meter by Jeffrey Caldwell A dwell meter is used to check the dwell angle on vehicles with a points-type ignition. Dwell angle is the length of time measured by the degree of rotation of the distributor cam the contact points open on a points-type ignition system. Points-type ignition systems were commonly used on vehicles manufactured before the mid s.

The dwell angle must be periodically checked on these vehicles to ensure proper operation of the ignition system. In addition, the dwell angle on these vehicles must be checked before setting the ignition timing.

Jun 03,  · Hook the positive (red lead) to the points. The easiest point is at the condenser. Connect the black to a ground. Start the engine and the needle will point at the degrees of dwell (how long the points are closed).

January 09, , It sounds like you already have begun teaching yourself how to maintain the car. You will find that we are willing to help. That engine is a strong motor, and when tuned correctly should run very well. If the timing is too far advanced, the car will ping, and also suffer from pre-ignition, which is the engine continuing to sputter and run on after you turn off the key.

For a short term fix, keep the car in “drive” when you turn it off while you are looking for the cause. Don’t let it cough and carry on for any longer than you need to. Now you need to figure out what is going on. In setting the “base” timing you need to remove the vacuum from the distributor. You can plug up the vacuum line with a golf tee, or small bolt. Set the timing to spec.

TDC Marker Unit

Remove the distributor cap, right valve cover and the 4 cyl rocker arms and pedestal. Set up a dial gauge on the 4 intake push rod. Rotate the engine to TDC 1 cylinder.

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This is sometimes caused by low battery voltage. Delete the codes, and disconnect the DME for 15 minutes. Then reconnect, let the car idle for five minutes, and then drive over 30 mph for more than five minutes. Recheck the codes – if it occurs again, the DME is faulty and should be replaced. Disconnect the DME for 15 minutes, reconnect, and then simulate a fault code, like unplugging the air flow sensor or idle actuator.

If the code reoccurs, then you will need to replace the DME. This code indicates that a test was performed, but no pulse was registered. Check the wiring and knock sensors. When you are finished reading the codes, you can reset the computer and clear them all out. Make sure that the last code has occurred, and then press down on the gas pedal for more than 10 seconds.

tach/dwell meter on a two

Report TheNamesDalton answered 3 years ago Im sure the original user that posted this question has their problem fixed by now but I felt it would be a good idea to share some knowledge I have from these processes for anyone that finds this from search. This is not me telling you that “this is the way it needs to be done” or “my way is better! This is what you will need Most Vortec engines have this from the factory and the TDC engine mark is usually on the timing chain cover Procedure Pointed to 1 when 1 is at TDC on the firing stroke Dont worry about being dead on but it does need to be within 1 tooth out of phase 2 – Start your engine and observe the timing the computer is commanding.

Should be somewhere around to degrees but could be close to that 3 – Hook up your timing light and set the advance on the light to match that of the scanner is showing that the computer is commanding.

This provides a direct signal from the MegaSquirt ® EFI controller to the PWM idle valve. Note that the transistor on the V3 main board is NOT sufficient to drive a .

Wasted spark with multiple coils It can also support coil per plug in some installs. For wasted spark you require a minimum of single “missing tooth” crank wheel, only engines with an even number of cylinders being supported. You need at least for 4cyl, for 6cyl or for 8cyl. However, the wheel is probably the easiest to obtain. The MS ECU can drive up to 6 seperate spark outputs, meaning it can run up to a 12 cylinder in wasted spark mode. For a distributor based setup with a trigger wheel, simply follow all of the wheel decoder instructions but rather than setting SparkB, C, etc as outputs as in a wasted spark setup only set LED17 as SparkA output and ensure all other spark outs are NOT set: The downside is that it is more difficult than EDIS and requires extra software settings.

Before setting up the wheel decoder, several questions should be asked: This matters because the camshaft turns half a revolution for every crank revolution. This will also help determine how to set things up later. When you have all this information, you’re at least ready to start.

Checking your idle speed with a tachometer