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1986 TC Project

Question on the #1 plug from the picture looks "white" compared to the others having a tan-ish color.
tc - can you confirm it is lighter in color than the other 3?

I would guess that #1 plug wire was not broken if it was lean/regular and not rich during the pull from the looks of that plug.
Did the plugs measure the same .016 gap?

I thought the idea of running updated ignition and coil was so you can run a wider gap and a better controlled burn?
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See updated photos of plugs in order.

   

   

Bottom up; 1, 2, 3, 4

#1 is a little whiter than #3 & 4. #2 is definitely the most tan. Maybe I have a dirty injector or possible air distribution change with the new intake manifold?

These were pulled after a 40 min ride home. Some highway and traffic.
400HP or Bust!
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I will try and post a video of the dyno pull when it broke up. I reviewed it last night and a noticed a couple of things,

1. MSD box did not fail during the actual run. It failed shortly there after.

2. After the pull the car stumbled and died. We cranked it, it started then died. Tried to re-start it and it acted like the battery died.

3. Checked the battery with a volt meter and measured 13.2. Checked the terminals and the positive was a little loose and I think the starter solenoid may be failing. Sometimes I need to tap it to crank. Need to fix that.

4. Checked the log and the volts read 13.2 at the end of the Dyno run.

5. We put a battery charger on the car and cranked it but it would not start. Pulled the coil plug and tested for spark, MDS box confirmed dead.

6. Replaced the box with a 6al and it fired right up.

7. Tried another pull and motor was breaking up like it was hitting a rev limiter. After several fueling adjustments no change. We checked the MSD 6al and forgot it had a rev limiter. The limiter was set at 6500. Adjusted the rev limiter to 7000, no change.
400HP or Bust!
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Weak v/springs?  I suggest testing their pressure.

If you don’t have a v/spring tester, you can get close-enough pressure readings by ghetto-testing with a bathroom scale on the table of a drill press. Just chuck up an old intake valve and use it to collapse the spring onto the scale until you reach the desired “open” height (installed height minus valve lift). 

If needed, replace ‘em with whatever-pressure springs are recommended by the cam mfr for the RPM ceiling you’re targeting.
Placerville, California
(former)  '78 2.3T Courier w/blow-thru carb ~ (current)  '87 2.3T Ranger w/PiMP’d EFI
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Ray, I spoke to Tim O who did the head and intake. He does not think it’s springs. He checked the spring pressures before sending the head back to me and all was good. Granted that was about 5 years ago but the motor has very little mileage on it. He recommended that I add some more grounds. He noted that based on his experience the MSD boxes don’t play well when there are grounding issues. He recommended that I add a ground from back of the 3G alternator to to block and add a ground from the rear mounted battery to the chassis. I did what he recommended, added a 4ga ground wire from the alternator case to the block and a additional 4ga ground from the Negative battery post to the bolt on the trunk strike loop. I also replaced the Autolite plugs with NGK’s gapped at .018 and replaced the #1 spark plug wire. I plan on checking the cap and rotor tomorrow and replace the coil wire.
400HP or Bust!
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I would check the MSD boxes.  Send the bad one back to get repaired.  Also, check the voltage going in to ensure you're getting full voltage and no voltage drop at RPM.  Poor grounds will kill those things.  So will taking them out of the box, evidently. Smile
Building (notso) cheap turbo Lima power!  450 HP or bust!
Cordova,TN
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Any updates on the ignition issue?
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I have been working on a few things that could have caused the miss. I think that I had grounding issues that could have contributed to the problem. I was having an issue which I thought to be a failing starter solenoid. If the car sat for a few days and I attempted to start it, nothing would happen. I would pop the hood an tap the solenoid and then it would crank. As noted above, I added the additional 4ga ground wire from the trunk mounted battery to the trunk latch. Magically my cranking issues have disappeared. I can let the car sit for a day, week and it fires right up. Next I focused on re-wiring the new 340lph pump.

In review of the specs for the Aeromotive pump, it looks like it need about 15~16 amps at 65 psi. I cut the Fuel pump 14ga power & ground wires inside the trunk. Leaving about 3 feet of old wire to the pump. I used the power & ground side of those wires to trigger a new 30 amp relay. I ran a 10 ga power wire from the relay 30pin to a 30 amp circuit breaker to a power distribution block which feeds my amplifier. The distribution block is connected to the battery with a protected 2ga feed.

From the new relay, I ran a 10 gauge wire from the 87 pin to the existing 14 ga power wire to the pump. From the pumps cut 14ga ground wire, I extended it with 10ga ground wire directly to the negative terminal on the battery.

In the event of a crash, the stock inertia switch kills the stock fuel pump relay which would kill the new added relay and ultimately the fuel pump. After completing the wiring the fuel pump operates the same. By reducing the length of 14ga wire I should be able to feed the pump the required amps at pressure. Hopefully eliminating a potential fuel pressure lose and possible lean miss. Prior time on the dyno, I was running a 255lph pump that the stock wiring could support.

I also read a bunch of posts were the following recommendation were made; Added a 12 ga wire from the aluminum head to chassis. Added a capacitor to the power and ground wires that feed the MSD ignition box.

I reached out to MSD and they received my boxes last Tuesday but they have not been examined yet. I am waiting for their analysis as to why they failed.

Plan is to take the car out this weekend and make a pull in 2 or 3rd gear to see if the miss is gone. Crossing my fingers.
400HP or Bust!
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(09-15-2020, 11:30 PM)tcoupeturbo Wrote:  MSD.....received my boxes last Tuesday but they have not been examined yet. 

Plan is to take the car out this weekend and make a pull.....
.
Unless you've got another MSD box to use......those two sentences seem incompatible with each other! I haven't got any personal beef with MSD, but - IMHO - having your boxes back in time for this weekend would be tantamount to having both an immovable object and an irresistible force in the same universe, lol.   Wink

Then again......The Eagles named their comeback album, "Hell Freezes Over"! Big Grin
Placerville, California
(former)  '78 2.3T Courier w/blow-thru carb ~ (current)  '87 2.3T Ranger w/PiMP’d EFI
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Ray, I have a back up for the back up.. Based on my past experience, I have a spare box in the trunk. It’s the base model Digital 6al.  I wired the system with plugs to I don’t need tools to swap them out.

   
400HP or Bust!
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