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Discussion Starter #1
hi, i have a 1990 240sx coupe. it has a KA24DE with dc sports headers, injen intake and custom 2.5 inch exhaust. the problem i am having is that my car won't go pass 2500rpm. after some search i found many solutions, mainly a bad maf. here is the problem tho. the ecu gives out a bad maf code everytime, but the shop i took it to swap out two different mafs and it didn't do anything. sawp auto and manual ecus, didn't do anything. checked coolant temp sensor, o2 sensor, spark plugs, wires, rotor, cap. checked timing, checked injectors, fuel pump. nothing seems to be wrong but the car still won't go pass 2500rpm. super wired, so please any advise would be helpful thx.
 

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1)Make sure your wiring for the MAF is solid.
2)Double check that your using the corrrect MAF.
3)You can "restart" your ECU by disconnecting the battery...see if that clears the code.
4)This is a bit of a stretch but, if the problem started AFTER you put the intake on, the intake can be effecting the airflow in a negative way and cause the MAF to read poorly.
 

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Yeah, what 93'det said. Also check your fuel pressure, if it's lower than 24lbs. it might do that. THe KA wants 30 or more, but will run on less and it'll have like 85whp. If it hesitates at all, I'd say it's your fuel pressure.
 

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Discussion Starter #4
checked everything listed here, wiring is all solid. i know that the car is stuck in limp mode but can't get it out of it. another problem is that even when the car is completely cold, as soon as i turned the key to on or start the engine, the temp gauge on the cluster just shoots all the way pass H, and when i rev the car in neutral, the temp gauge jumps up and down. would a bad distributor cause me stuck in limp mode or the wired temp gauge reading?
 

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^ lol this happened to me when I was driving. All my guages went crazy, slowly lost all power (electical and HP, it felt like I was driving a D series civic) I fooled around with the wiring, disconnected my battery, and car was fine.

Botttom line, I would check what you said and also check you wiring for all the sensors. Sorry, it's all I got :/
 

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i would check your TPS (throttle positioning sensor). just remember there not cheep and u have to install them perfect or you will be back in the same boat.
 
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