Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: 451Mopar]
#1077455
09/27/11 04:15 PM
09/27/11 04:15 PM
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Joined: Jan 2003
Posts: 1,263 Southwestern Ontario Canada
racealittle
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
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My 1974 Challenger had all these issues when I bought it. It was set up to start with a button.
I spent hours testing all the wires, voltages, values. I made my own harness and switched to an aftermarket ignition.
I still had the same results. I tore the ignition switch and related switches out of the coloum for individual tests.
Still not resolved, but that is because the car is in the paint shop at this time.
If the problem doesn't want to be fixed, a button will go back in
Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen!
Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!
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Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: racealittle]
#1077456
09/27/11 10:58 PM
09/27/11 10:58 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
super stock
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super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
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Didnt feel like reading all the post so sorry if its a repeat....
When my car did this it was due to (a rewire screw up) the distributor pick up wires being switched. I had put a new end on the wire harness side and didnt pay close enough attention. Would not start unless you released the key and got lucky.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: RapidRobert]
#1077458
09/28/11 11:06 AM
09/28/11 11:06 AM
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Joined: Apr 2004
Posts: 3,668 The Historic Hudson Valley
MONC
OP
master
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OP
master
Joined: Apr 2004
Posts: 3,668
The Historic Hudson Valley
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Quote:
the 4 pin ECU (that ran at one time) has been switched out to another 4 pinner right? I'd disconnect the hot lead to the "point" of the ECU pentastar connector and disconnect ALL leads off of the coil primary terminals then jump 12V to the coil positive primary and to the "point" of the ECU pentastar connector and reconnect the 1 wire (that you just took off) from the coil negative primary to the appropriate ECU pin then crank it with or without the key. It must start! Oh dont forget to check the reluctor gap and a quick visual for any damage (teeth etc)while you have the rotor out adjusting the gap. yes he could try another battery or jump from another one with cables just like a regular jump start and if his batt has a bad cell it could be dropping voltage fast when cranking but I am a k.i.s.s. guy but we are running out of ideas & sometimes off the wall stuff does happen (part of Murphy's law) and yes I agree the voltage is going to go way up when the starter is disengaged.
These tests are getting complicated ( for me anyway), let's hope it's the gap.
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Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: WheelsUp73]
#1077462
09/28/11 08:44 PM
09/28/11 08:44 PM
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Joined: Jan 2003
Posts: 1,448 right between milan dragway & ...
Flite_727
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,448
right between milan dragway & ...
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it's been many years, but i'm another victim of having this same problem being caused by a bad pickup coil. mine would only act up when hot. you can check the resistance of the pickup with a digital multimeter(i don't remember offhand what the range/specs. are, but the info is out there) & mine would be in spec. when cold, but out of spec. when hot. a couple of times it started with a huge backfire from all the fuel in the exhaust from cranking for so long!
'06 Magnum R/T Daily driver, 5.7 N.A.- [email]12.63@109[/email]
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Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: MONC]
#1077464
09/29/11 03:11 AM
09/29/11 03:11 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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I was thinking about this today on a way to test the grounding. If I recall, the ECU will ground the coil "-" terminal till it sees a pules from the distrubitor pickup? I think if you unplug the dist pickup, the ECU should keep the coil "-" grounded while cranking the engine. So try this test: #1 - unplug dist pickup wire. #2 - Connect a good voltmeter (positive/red meter wire) to the ignition coil "-". Connect the meter negative/black wire directly to the battery "-" terminal. #3 - jumper a wire from the battery "+" terminal to the ignition coil "+" terminal.
Test: The voltmeter should read nearly zero volts. The only voltage drop should be the ECU transistor junction voltage (maybe less than 1 volt?) Now crank the starter to put a high current load on the wiring. Because the dist is unplugged, the ECU should remain grounding the ignition coil "-" terminal. Ideally, the voltmeter reading should be the same as before. If the reading goes up, it is because of resistance in the ground path(s).
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Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: MONC]
#1077468
10/02/11 03:18 PM
10/02/11 03:18 PM
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Joined: Jan 2003
Posts: 8,489 Candler,NC / Myrtle Beach, SC
JDMopar
master
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master
Joined: Jan 2003
Posts: 8,489
Candler,NC / Myrtle Beach, SC
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To answer your ? about the star wheel, you can pry it up and off the shaft with 2 flat screwdrivers. Be careful not to drop the roll pin down into the distributor, or you'll have to remove the distributor to shake it out. Also,if it hasn't been suggested already...make sure the ECU has a good ground. They don't work well if they don't have a good ground to the body of the car.
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Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: dan9]
#1077469
10/02/11 03:26 PM
10/02/11 03:26 PM
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Joined: Jun 2008
Posts: 10,847 Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
I would drop the switch out of the dash and check the bigger wire , i think it is brown. I would use a test on it while you are cranking. It may be a bad terminal connection.
We had this problem with a 78 power wagon, the ignition switch would drop out enough juice so the ignition box would not fire during cranking.
Let go of the key and it would just catch as the switch contacts went to the run position.
Replacing the switch cured the problem.
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Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: gdonovan]
#1077471
10/02/11 05:05 PM
10/02/11 05:05 PM
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Joined: Apr 2004
Posts: 3,668 The Historic Hudson Valley
MONC
OP
master
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OP
master
Joined: Apr 2004
Posts: 3,668
The Historic Hudson Valley
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Quote:
Quote:
I would drop the switch out of the dash and check the bigger wire , i think it is brown. I would use a test on it while you are cranking. It may be a bad terminal connection.
We had this problem with a 78 power wagon, the ignition switch would drop out enough juice so the ignition box would not fire during cranking.
Let go of the key and it would just catch as the switch contacts went to the run position.
Replacing the switch cured the problem.
I already replaced the ignition switch.
I also just replaced the battery , as the existing one was at least 5 years old anyway .
Didn't make a difference, and now it's even harder to start...
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Re: Car starts when key is RELEASED, why? * UPDATE*
[Re: mopar_man]
#1077473
10/02/11 05:16 PM
10/02/11 05:16 PM
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Joined: Jan 2003
Posts: 4,664 Newfoundland
mopar_man
master
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master
Joined: Jan 2003
Posts: 4,664
Newfoundland
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monc, several posts ago i asked you to jump the wiring harness (pos on battery to pos on coil ) Did it start then when you turned the key to start position ? If it didn't , leave the key in the run position and try cranking it at the starting motor (big terminal on starter jumped to small terminal ) if it starts then , I still say the ecm is not powered when the key is in start position .
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