1990 Ford Aerostar check engine light won't always start

JEFF_D_FOX1234

MEMBER
1990 FORD AEROSTAR
6 CYL
2WD
AUTOMATIC
157,933 MILES

I have 1990 aerostar 3.0 v-6 battery was hooked up backwards replaced starter solenoid and fusible link ran fine for 2 months fuel pump went bad and replaced at same time check engine light came on when I turn key on check engine light doesn't always come on then van wont start have to keep turning ignition switch on and off till light comes on then it will start! Also replaced fuel pump relay and pcm relay tried reading codes from computer but reader says cannot read codes in either mode tried both! Also when its running check engine light flickers fast. Can power control module be bad and how can I test to be sure?

Saturday, June 19th, 2010 AT 1:12 PM

1 Reply

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there,

Thank you for the donation,

I would be suspecting a faulty ECU, hooking up the battery the wrong way would have resulted in a possible voltage spike, you can get the ECU bench tested, contact your mechanic as they will or should know who offers this service in your district, start here.

Mark (mhpautos)

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Thursday, June 24th, 2010 AT 5:18 PM