No start on 89 Cressida after replacing ignition control module

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Old 07 Mar 2014, 04:44 pm   #1 (permalink)
docsavage20@yahoo.com
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Default No start on 89 Cressida after replacing ignition control module

89 Cressida 7MGE engine. Had an intermittent no-start issue. When I taped the distributor end of the coil wire next to a nut on the shock tower, therewas no visible spark. After cranking a while I'd see spark and the car would start. Finally it got to where I just never saw spark, car wouldn't start.

Replaced the ignition control module and coil and it fired right up and ranfine for a couple of days. Now it's back to a no start.

Any suggestions as to what it could be?
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Old 08 Mar 2014, 01:50 pm   #2 (permalink)
Geoff Welsh
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Default Re: No start on 89 Cressida after replacing ignition control module

docsavage20@yahoo.com wrote:
> 89 Cressida 7MGE engine. Had an intermittent no-start issue. When I
> taped the distributor end of the coil wire next to a nut on the shock
> tower, there was no visible spark. After cranking a while I'd see
> spark and the car would start. Finally it got to where I just never
> saw spark, car wouldn't start.
>
> Replaced the ignition control module and coil and it fired right up
> and ran fine for a couple of days. Now it's back to a no start.
>
> Any suggestions as to what it could be?
>


the most obvious is that the "new" (Never Ever Worked before) part
failed. Luckily you know how to troubleshoot it already. And of course
a bad coil could have overworked the new igniter.

Of course being a 1989, something else, like the fuel pump, or ECM could
have easily failed.

GW

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Old 08 Mar 2014, 03:38 pm   #3 (permalink)
docsavage20@yahoo.com
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Default Re: No start on 89 Cressida after replacing ignition control module

On Saturday, March 8, 2014 1:50:51 PM UTC-5, Geoff Welsh wrote:

>
> the most obvious is that the "new" (Never Ever Worked before) part
>
> failed. Luckily you know how to troubleshoot it already. And of course
>
> a bad coil could have overworked the new igniter.
>
>
>
> Of course being a 1989, something else, like the fuel pump, or ECM could
>
> have easily failed.



Tentatively looks like the distributor, or more accurately the sensor pickups within are the culprit. I'm told there are Hall-effect sensors within that can go bad? Happened to have a spare distributor sitting around, put it in and the car fired right up. Of course it initially worked when I put in the new ICM too, so I'll have to give it a few days of start/sit/start again before I declare it cured.
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Old 09 Mar 2014, 07:54 pm   #4 (permalink)
Geoff Welsh
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Default Re: No start on 89 Cressida after replacing ignition control module

docsavage20@yahoo.com wrote:
> On Saturday, March 8, 2014 1:50:51 PM UTC-5, Geoff Welsh wrote:
>
>>
>> the most obvious is that the "new" (Never Ever Worked before) part
>>
>> failed. Luckily you know how to troubleshoot it already. And of
>> course
>>
>> a bad coil could have overworked the new igniter.
>>
>>
>>
>> Of course being a 1989, something else, like the fuel pump, or ECM
>> could
>>
>> have easily failed.

>
>
> Tentatively looks like the distributor, or more accurately the sensor
> pickups within are the culprit. I'm told there are Hall-effect
> sensors within that can go bad? Happened to have a spare distributor
> sitting around, put it in and the car fired right up. Of course it
> initially worked when I put in the new ICM too, so I'll have to give
> it a few days of start/sit/start again before I declare it cured.
>


while it /is/ working, gently wiggle the distributor connector from
side-to-side and twist the wires right there too. A fraying wire will
often work intermittently when connectors are twisted during
installation of components and lead to false "I fixed it!" conclusions.

hth,
GW
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