| Subject: |
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Re: Mopar Electronic Ignition Troubleshooting |
| Name: |
|
Jeffc |
| Date Posted: |
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Aug 23, 08 - 7:30 PM |
| IP Address: |
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67.150.175.115 |
| Email: |
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jeffc@pcez.com |
| Dodge-Link |
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http://imageevent.com/jeffc/ |
| Message: |
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Below is outtakes from Jimmy's post, there is
some "miss-info" in there so here is the right
info. outakes are in " " , nothing reflecting
on Jimmy himself as he is just passing info
on....
"Remember that Mopar ECU & voltage regulator must have clean bare metal ground, plus ECU requires fully charged battery for the voltage shot to transistor."
Very true, however, in un-restored trucks/cars
this can sometimes be a challenge. Often just
adding a ground wire from the battery neg post
to the mount screws of the ECU box will solve
what can be a intermentent problem (cut out, false
signals, misses, ect)since not all ECU boxs are
mount by everone on the fire wall were a good
ground can be had from engine ground to fire
wall strap (assuming that the strap and engine
to battery strap are both in good shape).
"The 5 wire ECU & connector has a spare wire terminal not used in 4 wire ECU, green with red stripe, which is an auxiliary ground lead. You can use a 5 wire ECU in a 4 Wire ECU vehicle but not vice versa, as no 4-wire ECU works in a 5-wire vehicle."
The green wire with red strip is NOT a aux ground lead! it goes to one of the posts on the 4 post
ballast resitor used with a 5 pin ECU box.
You CAN NOT use a 5 pin ECU box in place of a
4 pin ECU box unless you install a 4 pin balast.
>>You CAN use a 4 pin ECU box in place of a 5 pin
ECU box that is in all early Mopar EI systems without
changing the 4 pin old ballast(assuming that
the wires are all stock and unchanged), it is a bolt in swap without any mod's needed.
"To quickie wire up an ECU connect one wire from the 'IGN' pole on the ignition switch to one side of the single ballast resistor and from the other side run a wire to the side of the coil. This drops voltage in the 'Run' position. Now run a wire from the 'START' pole of switch to the other side of resistor, the coil side. This gives you full 12v for starting."
Correct.
"I believe most big blocks have counter-clockwise rotation of distributor rotor, small blocks clockwise."
NO, all Mopars v8's turn clock wise with a fire
order of 18436572.
"Remember that engine-to-firewall ground strap is required, clean bare metal ground on both ends."
YES!
"If engine just doesn't want to start check ballast resistor, they are a common fault. Some will only start as you release key from 'Start' cranking position to 'Run' position, indicating a bad ballast resistor."
Above can also say-- bad ground.
"Mopar Electronic Ignition Testing:
It is critical to proper operation of ignition to make sure there is a solid bare-metal ground between ECU case and ground and between Regulator case and ground. Sometimes a jumper wire is needed."
Yes! I often add the extra ground wire (jumper) just be sure the ECU box is grounded.
Rest of the info sounds right so here is were I stop. |
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