ecu which are the same?

949

i was curious which model and year would be the same as the 1991 wagon 4wd manual ecu's?

evol911

PM6 from 88-91 Civic\CRX Si is the best if you have the 1.6 motor(D16A6). You can also use PM7(JDM DOHC ZC) but you will run rich. And I think PG7 also. Go to a junkyard find a manual Civic\Crx or 88-89 Integra that has a 1.6 and grab the ECU, most likely it will work. If that doesn't work for ya, go carbeurated!!! :roll:

949

oh no i was only asking because i need to see if my ecu is messed up or fried. i just need to know which ecu will just plug up and run stock. so i can find out if its the ecu giving me idle issues.

evol911

PM6 is the one you need. The code on the side of the ECU should look like this: XXXXX-PM6-XXX (the X's are just random numbers and letters, the PM6 determines what motor it's for). Make sure it says PM6 on the ECU and you should be fine.

davens

Ideally...the 90-91 PM6
Just about as good...89 PM6
Good enough...88 PM6

Will work, but can cause more problems than they solve:
88-91 PM7
88-89 PG7(NOT 86-87!)
90-91 PM4

949

does the year matter?

i noticed a date stamped on the side of the ecu. would i want to get the newest year possible?

what does the pm7 come from?

evol911

PM7 is from a ZC. Try to find one that is close to your year and remember that some ECU's are stamped witht the before because they are made a year before the cars were sold. I.E. I 've seen a '88 Crx with a date stamped '87 because the car was actually built in the months before'88 but it was still an '88 production.

davens

949 wrote:

does the year matter?

i noticed a date stamped on the side of the ecu. would i want to get the newest year possible?

The 1988 was the first year to offer full pgmfi in an ecu that controls both fuel curves and ignition advance. The ecu was constantly changing through the entire 4 year production run...that tells me they there was either room for improvement or they were trying to correct minor flaws.

The 90-91 definitely have the better board design, and the benefit of two years of refinement.

949

good to know. so at this point ill look for something with at least 1991 stamped on the side of the ecu for the newest program and chipset.