no start issue when warm on my supercoupe

Vehicle specific forum for tuning the 1989-1995 Ford Thunderbird SC utilizing GURE, GSALC, GSALI, and CZAW0 Strategy

no start issue when warm on my supercoupe

Unread postby Boostcoupe » Mon Jan 22, 2018 8:24 pm

so i have an 1989 supercoupe i picked up this summer, it had sat for about a year when i got it, previous owner (older gentleman) said it ran good when he parked it, it will start and run but idles rough when cold like its down a cyl, once it starts to warm up a bit it smooths out and runs pretty good. now after it has got good and warm it will start to run rough again and spit and sputter when i try to rev it some, if i shut it off it wont start back up, juts cranks over. if i give it about 90% throttle it act like it wants to start but wont untill it has sat for many hours.
i ran codes and koeo i got a 51 koer i got 51 and code 98

51= ect sensor is greater than the self test maximum of 4.6v
98= hard fault present

could a bad ect cause a no start issue like that? i had previously changed the dis and the coil pack with no change.
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Re: no start issue when warm on my supercoupe

Unread postby decipha » Tue Jan 23, 2018 1:10 am

yes the ect sensor just like the act sensor is a critical input, it is linked internally hardware wise to the act sensor as well, any bad value on that sensor could cause false values on the other

fix the ect sensor before proceeding

you should be able to identify the ect has failed by the ecu turning the low speed fan on constantly
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