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How often to ICU's or ECU's go bad??? 200 1988

posted by  cbremski on  Sun Apr 13 07:48 CST 2003
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What are the chances I somehow fried the ICU or the ECU on my '88 244 159K during my changing of the Valve cover gasket last weekend.

I changed the VC gasket and replaced the fuel pump relay...I do regret to say I recall I did not unhook the battery during all of this. Also I had put the cap plug wires on incorrectly, but later relized it and corrected the order. still no running (car starts but no running).

Aye Roll suggested the crank sensor (I am assuming this is the same as the hall sensor which lies under the plastic piece under the ign. rotor, right?) could have gone bad. Is this easy to test?

I have changed the cap, rotor, wires, FPR, in-tank pump and all the fuses in the fuse box. the 25amp fuse was recently replaced and cleaned as well. the main pump runs when starting, all vacuum hoses are in place and haven't been touched. The throttle body switch has been adjusted to click when supposed to.
Ign. and Fuel grounds have been sanded and re-attached to make sure they are solid. I was getting a blue spark, but last night it is now orangeish colored. The ign. coil checks out ok with ohms, plus I get spark. I get fuel as well.

Any suggestions? Any tips?
TIA to everyone,
Chuck








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    How often to ICU's or ECU's go bad??? 200 1988

    posted by  david hunter on  Sun Apr 13 14:10 CST 2003
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    What to mean when you say car starts but no running??

    If you have fuel and you have spark and the cam is turning it should start. How did you check for fuel and spark? This problem is almost surely related to what the work done. ICU and ECU I am sure are OK.
    --
    David Hunter








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    How often to ICU's or ECU's go bad??? 200 1988

    posted by  Aye Roll on  Sun Apr 13 12:01 CST 2003
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    I thought you were describing a 1990 for some reason... no, your 88 doesn't have the crank sensor, just the distributor hall sensor. And yes, it could be the problem, but it is also worth looking at the power stage over in the fenderwell.
    They do fail with similar symptoms as well. I personally haven't had a failure of that but one of mine does seem to have a new one in it....
    --
    Rob Bareiss, New London CT ::: '86 244DL- 215K, 87 244DL- 230K, 88 744GLE- 198K, 91 244 180K








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    How often to ICU's or ECU's go bad??? 200 1988

    posted by  rhaire on  Sun Apr 13 09:05 CST 2003
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    I have never heard of a single 554 ECU, the one in your 88 240, going bad. I do not think anything you did was likely to affect the ECU. I doubt the ICU was compromised but I have less contribute there. The Hall sender sounds like a good one. If you do not have J. Sargents test protocol I can send it.








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      How often to ICU's or ECU's go bad??? 200 1988

      posted by  cbremski on  Sun Apr 13 09:21 CST 2003
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      R,
      yes please email it to me or post it whichever. Thanks for your help! I am pleased to hear the ECU and ICU in your opinion are both probably good.

      Thanks
      Chuck







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