Check for leaks and give it a good tune up. If it has a check engine light on, go to auto zone and have the codes read free.
I have a 1990 Nissan 240 sx Fastback. I got terrible mileage as well.I assumed I should get at least in the twenty's. I was getting 14 mpg. In my search I noticed that two of the fuel injectors were leaking.I found out that there was a tech service bulletin about this.I thought the cure was new injectors.As I replaced the injectors I found that I couldn't get the rubber seals to stop leaking.As it turned out, the injectors were'nt leaking,the rubber "O" rings were.There are three per injector. Two at the top.One is pushed inside a metal tube called a fuel rail. This metal rail supplys the fuel for the injectors.I bought new "O" rings from NISSAN. I was told that after market "O" rings won't work well.The price wasn't significant (about $10.00). After a few try's I got them all sealed. It wasn't easy...took patience. It stopped leaking and my mileage is between 21 mpg and 25 mpg. .Didn't need the injectors...but I installed them anyway...Bob
Yes the ecu will work. First disconnect the battery and connect the new one then reconnect the batter. Start up the 240sx and it should work it not it needs to be diagnoste goggle 1990 240sx ECU CODES FOLLOW THE STEPS AND THAT SHOULD WORK I know cause I'm using a 1992 ECU FROM Nissan Stanza. I was told it's alittle advanced on the horse power side and idle moves quicker.
If the operator is not concerned with emission regulations he or she may be faced with steep fines. Also an engine that is not within regulations often is not running efficently. This may cause an excessive increase in fuel consumption. If the operator is not concerned with emission regulations he or she may be faced with steep fines. Also an engine that is not within regulations often is not running efficently. This may cause an excessive increase in fuel consumption.
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