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 Post subject: ECU
PostPosted: Wed Jul 09, 2014 3:08 pm 
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Newbie

Joined: Fri May 30, 2014 1:08 am
Posts: 37
Location: Eugene, Oregon
My ecu, on my 89 mirage turbo (w/ 4g63t) is being screwy, what ecu should I replace it with? does it need to be chipped? any recommendations?

I have a stock 90 ECU as well as a 92 socketed EPROM with a custom chip that I received from prior owner. Stock ECU makes the car run decent but still not like it should. 92 ECU (w/ pins swapped) doesn't work at all according to shop.

Don't really know whats wrong with the ECU, but they guys at the shop said that I should get a new one.

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'89 Mirage turbo


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 Post subject: Re: ECU
PostPosted: Wed Jul 09, 2014 4:20 pm 
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Moderator

Joined: Sat May 14, 2005 11:15 pm
Posts: 7515
Location: Stantonsburg, NC
This shop that you speak of, are they familiar with dsm's at all? If not they may have you replace half the car before you find the cause of your problem. This is why I encourage people to get out there and wrench on their own rides.

If you do indeed end up needing another ecu grab one from a 90 dsm or from another original turbo car. Also what injectors are you using, stock 450's?

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93 Mitsubishi Expo LRV 1.8/manual
95 Eagle Summit DL Coupe 1.5/manual
01 Mitsubishi Mirage ES Sedan 1.8/manual


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 Post subject: Re: ECU
PostPosted: Wed Jul 09, 2014 4:30 pm 
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2nd Banana
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Joined: Wed Dec 28, 2005 1:16 pm
Posts: 9369
Location: San Diego, CA.
ECU's rarely go bad, with the exception of leaking caps, which are clearly visible if you take the ECU apart and look at the board. I'd question why they're telling you the ECU is bad.

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91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

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 Post subject: Re: ECU
PostPosted: Wed Jul 09, 2014 7:33 pm 
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The Silent Administrator
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Joined: Wed Dec 24, 2003 3:32 pm
Posts: 9524
Location: Ottawa, ON, Canada
Quote:
ECU's rarely go bad, with the exception of leaking caps, which are clearly visible if you take the ECU apart and look at the board. I'd question why they're telling you the ECU is bad.
Yes.

It would be nice to know the symptoms and what you tried, if anything, to repair it and or known issues with the car in its current state.

Also, what was their diagnosis and why?


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