1997 Ford Aerostar Won't Start - Ignition System

Question: There seems to be no spark when engine has been off for more than 1 hour. After playing with ignition key and only when hum of fuel pump comes on and off after 5 secs does the car start. there is no spark at coils when it acts up.

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Technican: Hello, Which engine do you have? Have you had the troubles codes accessed? Autozone and Advance Auto will check the codes free of charge. If the check engine light comes on at anytime while the engine is running have the codes checked. Let me know the actual code numbers, IE- P0300.

Owner: There was an egr trouble code about three months back but has gone off since than. There are no trouble code at present. No check engine light.

Technican: Most likely the cranshaft position sensor or the ignition switch itself. Is the check engine light coming on when you first turn the key on, as it normally does? If not the system is not powered up. If it does test the crankshaft position sensor.

Owner: Had to bring it for service today, didnt have choice. The technician narrowed it down to a coolant sensor malfunction. He had the luxury of swapping a few parts before pin pointing the problem. thanks for trying, tough to diagnose over the net. he also thought it was an ignition switch. Ps. cant understand why for awhile it would start after wiggling the ignition key. I guess this why ford reconmends wiggle test.

Technican: I wonder if the coolant sensor was shorting. This is the only way I can speculate the coolant sensor would be capable of shutting down spark and fuel. Please stop back in a few days and let me know if this really fixed the problem.

Owner: It happened again this morn, it would not start until I wiggled the key between on and start for at least twenty seconds and than I would hear the hum of fuel pump and turn the key all the way and bingo it starts. This wiggling energizes ignition and fuel. Odd, any Idea.

Technican: I have to wonder if the ford tech began replacing parts during the no start period- and by happenstance after the coolant sensor swap the engine fired up. If so this is not proper diagnosis, not when you are paying. You should be given a refund or they should fix the real problem free of charge. Call the service manager and offer complaint. If this yields no results call the salesman and give him a chance to make it right. I still have to wonder about the ignition switch or it's connections. A bad relay is also possible. YOu need to find someone that will do key on voltage checks during the no start period. This will allow the individual to find the circuit that is lacking power and trace it the falfunctioning component. How many diagnostic hours did they have on your vehicle?

Owner: It was a small service station that tried to repair the problem. Got my money back for labor but decided to keep the coolant sensor. You metion relay, can it malfunction when van is cold. Which relay controls the spark and primes the pump @ the same time.

Technican: Sorry for the delay. I will need engine size to offer more detailed information on diagnostics.

Owner: Its a 3.0 litre engine with AC

Technican: You need to see if the ignition switch is sending power to the PCM (computer) relay. If you don't have wiring diagrams I can send you some if you reply with an email address. BTW- During the no start period, does the check engine light turn on as it normally does when turn the key?

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