123 Install Today - GETTING CLOSER..., PROGRESS: BAD MPS |
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123 Install Today - GETTING CLOSER..., PROGRESS: BAD MPS |
FlacaProductions |
Dec 14 2023, 09:50 AM
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#1
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Senior Member Group: Members Posts: 1,733 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California |
74 2.0 D-Jet
Heading to the garage now to start the install and my main, unresolved-in-my-brain question is if i need to hook up the vacuum line that is on my current stock distributor, on the 123. |
technicalninja |
Dec 20 2023, 05:57 PM
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#2
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Senior Member Group: Members Posts: 1,827 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region |
Just re-read everything.
@iankarr advice is spot on. Disco/plug vaccum, put in simple base map, make sure it runs. Perfect progression. Another tip that has caused me grief with diag before is "make sure your spark plugs aren't fouled"... Many of your posts sounded like either misfire or "not in correct firing order" problems. Many of the other posters picked up on this. Pull all plugs, inspect, clean. While plugs are out verify TDC on #1 via the finger/tube method. Check flywheel mark to fan mark correlation. With engine on TDC #1 look at which cap tower distributor rotor is pointing at. Make sure this goes to #1. Do the green light test/adjustment at this point. Install plugs/wires. Get the direction of rotation, timing order, and cylinder layout correct. The T4 has a normal firing order and a strange cylinder # scheme to me. Most manufactures number odd on one bank and even on the other with the rod journal position on the crank determining cylinder number. The T4 is not this way. Try to start. Still not friendly? First, I'd remove the cap/wires from the distributor, pull it from the engine with the primary wiring still connected. Take the coil wire out of the cap and affix it 3/8" away from engine ground. ATTACH GROUND JUMPER BETWEEN THE DISTRIBUTOR HOUSING AND THE ENGINE. This is in CAPS as there is a chance you might fry the circuits and chips inside the distributor if the housing is not grounded properly. Now the distributor is free of the engine, still hooked up to the primary circuit, properly grounded, and in your hands... Turn ignition switch to ON. Spin it from the drive gear and watch what the coil wire does. It should rain fire. The sparks should be blue and distinct, it should "crackle and pop" with each spark. If yellow and soft you have either a bad coil, bad ignitor unit (inside 123), or restricted primary voltage (check this with a DVOM at coil +). Still screwing up after the above? Put the old points distributor back in it, make it run properly and go drive it 10-20 miles to clean heads/tops of pistons. "Blow it out" under load! (this stage is often FUN!) I'd speak with Ed if the old distributor makes the car run and the new one does not. |
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