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We have a 79 F-150 with a 429 police intercepter. It ...
Sent to Car Experts May 19 09:28 AM

We have a 79 F-150 with a 429 police intercepter. It wouldn't start the other morning and the coil had no spark. We replaced the coil and the plug wires and it fired right up and ran great!! We took it for a test drive, it drove about 2 miles, we turned a corner and it instantly died. It is getting plenty of fuel, but seems to have no spark again. We tried another coil but no luck. While you are turning it over it doesn't try, but as you let off the key it chugs like it wanted to start but does not. HELP!!

 

Optional Information:
Pre-1981 Ford F-150 429police inter

Already Tried:
replaced coil, replaced cylinoid, checked fuel, check grounding

Customer (name blocked for privacy)
Status:  Closed   Value: $9
Reply
May 21 12:32 PM (2 days and 3 hours later)
         
Relist: I still need help.
Customer (name blocked for privacy)
Answer
May 21 12:48 PM (15 minutes and 33 seconds later)
         
REPLIEDCheck Mark
The ignition switch is faulty in the crank position but getting power to the coil in the Hot-In-Run position.This is easily verified by checking for 12V at the coil pos. lead with a test light or volt-meter.There should be voltage present at full crank position and at the hot-in run position.The switch is located down in the column.The part where you put the key is only the ignition lock cyl.There is a linkage rod that goes from the lock to the switch that sometimes gets bent or out of alignment which will cause this.Most of the time it's the switch itself though.

"It is much wiser and cost efficient to ask a question than to stumble blindly through your auto repairs".Please Click Accept if my answer was helpful.
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Michael -- Auto Service Technician -- 99% Positive Feedback on 598 Car Accepts
21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
Info Request
May 21 12:50 PM (1 minute and 56 seconds later)
         
If you would like the instructions to replace that,let me know and I will post them for you.

"It is much wiser and cost efficient to ask a question than to stumble blindly through your auto repairs".Please Click Accept if my answer was helpful.
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Michael -- Auto Service Technician -- 99% Positive Feedback on 598 Car Accepts
21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
Reply
May 22 6:34 PM (1 day and 5 hours later)
         
Reply to Michael's Post: Why is it killing the engine once it is warmed up? Is the rod inside the new ignition switch or is it a seperate peice that we have to buy. Thank you.....
Customer (name blocked for privacy)
Answer
May 23 5:26 AM (10 hours and 51 minutes and 58 seconds later)
         
ACCEPTEDCheck Mark
The control rod is hooked to the switch.If it slightly bent or the switch has been broken internally,there is no telling when it will fail on you.Any vibration or bounce that shakes it the wrong way could cause the circuit to go open.There are other things that may be occuring,but this is most common.That is why I suggest the test for voltage while cranking.It will verify or eliminate the switch as the culprit.Does this have the regular Dura-spark II ignition system?Or did you install something else in it? TFI system?

"It is much wiser and cost efficient to ask a question than to stumble blindly through your auto repairs".Please Click Accept if my answer was helpful.
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Michael -- Auto Service Technician -- 99% Positive Feedback on 598 Car Accepts
21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
Reply
May 23 8:50 AM (3 hours and 23 minutes and 30 seconds later)
         
Reply to Michael's Post: It has the regular igniton system in it. Thank you very much for your help.
Customer (name blocked for privacy)
Answer
May 24 8:18 AM (23 hours and 28 minutes and 45 seconds later)
         
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Michael -- Auto Service Technician -- 99% Positive Feedback on 598 Car Accepts
21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
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