EJ22 won't start

[nietz]

Justin, I have spoken to Darrell and he is with Waddles, new Link computer. I"m basically delaying the inevitable here (buying a Link computer) and hoping someone out there comes up with something I haven"t tried yet.MadMuz, the gyro is at Caboolture, I"m in Brizzy. I don"t think the borescope will help but thanks anyway.Tony, who and where is this guru?? Sounds like he likes a challenge...I have one for him!Deano, there is only the one relay that I can find and its the one I replaced yesterday.

[MadMuz]

When will you be at the hanger again? I can bring it down if you want to see if you can see the mark?

[nietz]

When will you be at the hanger again? I can bring it down if you want to see if you can see the mark?I was able to see the mark and double check by counting the teeth in the end but thanks.

[MadMuz]

No worries.... was it correct?How did you count the teeth while you were flying waddles machine? ;D

[nietz]

Yeah, all good. Had a few spare minutes between TIFs

[blakemorem]

G"day Bryce, I have read thru the posts on your ECU problem and the only question i have is Have you actually replaced the parts mentioned or tested them, The reason i ask is that you may by chance re introduced the defective part back into the equation. The actual part I"m concerned about is the coil Pack. My specialty was high power amplifiers and Hybrid transistor/N-FET switch mode power supplies. I can tell you from my learner "d past in electronics i have had a similar dilemma.Only to find an elusive re offending part,the coil the fault was intermittent thermal and went open circuit primary at about 50 Deg C. The engine was a Hyundai and had same setup with shared ignition on cylinders. I was fortunate to have an ECU that was accessible and was not buried in resin although semiconductors were scrubbed. I blanket re-soldered with caution of ESD devices, the entire circuit board and changed capacitors for high temp low tolerance electrolytic type and begrudgingly bought an gold plated Factory Hyundai Coil pack. This exercise bought me about six months of bliss until i got the inevitable phone call from the missus stranded roadside half way home from work. By the time i got there the engine had cooled down and ran perfectly all the way home. I really began to hate this car. So time to check all earths and break out the oscilloscope and a 6 pack of patients. I connected to the primary side of the coils with dual trace first on AC adjusting the amplitude voltage so i could clearly watch the switching pulse of both coils. It was not until i observed the DC component of the sawtooth waveform i could see a resistive component creep in until the coil virtually ran out of spark. I could delve into the theory of the ECU circuitry but not necessary, all i need to say hear is the switching transistors have a temperature coefficient, gain HFE or beta, they also have a saturation point and thermal runaway protection part of the circuit design is to boot strap the transistors to reduce switching bias current base emitter pending on transistor type and whether the circuit is class A,B,or C design in order to mitigate thermal runaway. The coils also have what"s called a Hysteresis loop they also have a saturation point and will deliver no more than whats asked for pending on the primary current. Current is

[tonydenton]

I"m not sure if "Andrew" can help over the phone, or will be able to help, or want too, but his phone number is 07-41513141 business is called "APLUS EXHAUST AND MECHANICAL." it"s only a local call to heaven for me here

[blakemorem]

Hey Bryce, just another quick suggestion for what it"s worth , firstly if the fuel injectors are working on the dead side you may be setting up for a big bang in the muffler from a high air fuel mixture. If easy to do id be inclines to remove the muffler as a precaution and even the prop if the engine can run safely without it. I have a few ideas and me trusty oscilloscope and good fluke meter if we need to really get down to diagnostic level.Mike.

[nietz]

Hi Mike,I have replaced most components (including the coil) one at a time. I have also checked the resistance across the coils according to the manual. Unfortunately, I think I may have also charged the battery while still connected.I will definitely take you up on your offer of help if you have time while you are in the area. Thanks,Bryce

[Brian]

I havent had time to read all the posts but having been a long time 2.2 driver with a wolf computer I can give you a couple of things that happened to me that stopped the noise.First one was moisture coming down the wiring loom into the computers pins, sprayed the pins & plug on the loom with copiuos amounts of contact cleaner

[RossM]

First one was moisture Second time was moisture [ again] I thought a sheep man would have been using lanolin long agoI am probably wrong, but was told is good to protect electrical connections as well as its other uses.Ross

[tonydenton]

spray all your relays with electric contact cleaner too.

[Brian]

I thought a sheep man would have been using lanolin long agoI am probably wrong, but was told is good to protect electrical connections as well as its other uses.RossThats good Ross, I"ll pay that one Until you get caught in a real heavy thunderstorm, you dont really know what can get moisture in it.

[blakemorem]

Hey Bryce, some good pointers made in the last couple of posts like ingress of moisture and contact cleaning. CRC Make a good contact improvement spray

[mad max]

If it"s a "maloney system" we put all the diagrams on the forum about one and a half yrs. back. I can fax them also. (I"m a bit old fashioned)