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1993 Nissan Sentra XE Bad ECM?????


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bryanspurrier
Novice

Aug 23, 2005, 10:13 AM

Post #1 of 10 (3883 views)
1993 Nissan Sentra XE Bad ECM????? Sign In

Recently I replaced the entire a/c system to get it to work. I had to replace my ECM to fix a missing ground for the system. I bought a used ecm from a junkyard and after installing it the car ran very rough, with lots of mini-backfiring and a drastic decrease in mileage. The gears also shift very roughly, sometimes staying in 3rd even doing 65-70 mph until I let up and slow down about 5 -10 mph when it then shifts. Is the problem with the computer or is it something else?


DanD
Veteran / Moderator
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Aug 23, 2005, 11:25 AM

Post #2 of 10 (3876 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

All I can say is put the old ECM back in and try it??
Dan.

Canadian "EH"






bryanspurrier
Novice

Aug 23, 2005, 12:52 PM

Post #3 of 10 (3872 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

When I put in the origional the car acts normal, with some slight rough gear shifting, but the a/c does not work. I should have said that the car stutters during all gears and pulses while stooped roughly with the 2 newer ecms.


DanD
Veteran / Moderator
DanD profile image

Aug 24, 2005, 4:29 AM

Post #4 of 10 (3862 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

Is the replacement computer number matching to the original?
If not then that’s probably the problem and I mean number matching just because the box looks the same it could be completely different inside as in programing.
Dan.

Canadian "EH"






bryanspurrier
Novice

Aug 24, 2005, 5:25 AM

Post #5 of 10 (3861 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

Yes, on all three computers the numbers match. I think I've exhausted all of my local supplies ( at least in a 10 county area) just to find two. I am looking online though, and a friend said something about reprogramming the ecm, which I have not heard of...


DanD
Veteran / Moderator
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Aug 24, 2005, 7:11 AM

Post #6 of 10 (3856 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

If the car was OBD II 1996 and later then yes it could likely be reprogrammed but I’m not sure if a 93 could.
This is just a thought but is there an access panel on the ECM that would allow you to remove the PROM (programmable read only memory) chip.
I’m not familiar enough with Nissan, but some manufactures like GM use to use them to calibrate the ECM to a specific vehicle. In other words there was one ECM that covered a bunch of different models and the PROM would tailor the setting for whatever that particular car needed to run properly.
Maybe give the local dealer a call and ask some questions.
Dan.

Canadian "EH"






bryanspurrier
Novice

Aug 24, 2005, 7:46 AM

Post #7 of 10 (3853 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

Thank you for the info and help, Dan. By any chance do you know of any good web sites for an ecm? I had one about three weeks ago and deleted it by mistake and can't seem to find it anywhere. Thanks again.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 24, 2005, 8:10 AM

Post #8 of 10 (3852 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

Try some surfing at top - you can probably get what you need from this site! If not try Dan D's,



bryanspurrier
Novice

Aug 24, 2005, 8:12 AM

Post #9 of 10 (3851 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

Thank you!


DanD
Veteran / Moderator
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Aug 24, 2005, 8:23 AM

Post #10 of 10 (3850 views)
Re: 1993 Nissan Sentra XE Bad ECM????? Sign In

No I don’t know of any sorry.
Dan.

Canadian "EH"










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