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Replaced ECU in '89 240...Car starts but won't keep running....Why? 200 1989

posted by  Cnner on  Thu Sep 30 02:58 CST 2004
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Newbie Question...I've replaced the ECU and the car now starts but only runs for 10-15 seconds. It will restart right away, but again only runs for a few seconds. I've also checked the fuel system relay and the air flow meter both checkout ok. What should I check next? Thanks!








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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

What made you think that the ECU was bad? Assuming that the car wouldn't even start initially, then the ECU was probably bad since it will at least run now. Given that, I'd check the connector plug on the AMM. I had one of the little itty bitty prong things slide back when I was pushing the connector back onto the AMM. You'll have to examine the AMM connector closely. If there's a clip prong thingy that's pushed back up into the connector, then you'll need to get a little screwdriver or something to keep it in place when you re-connect the cable.

If it ain't the ECU or the AMM, then I'd start looking at fuel delivery problems, i.e., fuel pump, filter, etc.
Cabbie2169



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

I just sold an '89 ECU on E-bay. Was it you who bought it?

I would also look at the AMM. Unplug it and see if the car will Idle for you.
--
'75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

That is how a bad 016 AMM behaves. Hard to believe they both failed, but....



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

I bet you somehow disturbed the wiring to the fuel injection relay.



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

Firstly explain why you changed the ECU... what was the problem.
It could be one of many things now, you need to give more information.
Check codes of course (see 700 faq, same thing)
Could be AMM, temp sensor, ignition parts OK?, clogged cat, and others....


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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

Just a thought...

Check to see if throttle body is clean and the TPS is properly adjusted

http://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm#ThrottleBodyandThrottlePositionSwitchAdjustment

Good Luck
Danny Mac



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posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

What codes does your new ECU give you? The code reader is under the hood on the driver side on the strut tower by the firewall. You will find tables for these codes in both Bentley and Haynes.
--
'89 244DL M47 162K miles



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