not going past 4000 rpm

brad M · 07-06-2004

gone thru the all data tests on vtec code, and it says to replace ECM. does anyone know want the hell is going on with these cars because i see alot of people are having the same problems. any help would be great.

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gearbox · 07-06-2004

I'm assuming the car is stock. There have been issues with the ecm going out, but very rarely. So you did an ODBII diagnostic and it says replace the ecm? It might also be the vtec solenoid, but it's hard to tell. If your car is under warranty, just take it back and have them fix it.

Samari · 07-06-2004

that sucks man, i hope it warrentied though. good luck with that.

tinman · 07-06-2004

4000 rpm is limp-home mode. Something is telling the ECU to go into this safe mode.

If the ECU is indeed bad, you are running on the back-up chip. Honda ECU's have a fail-safe. What codes are you getting?

SuperFrankie · 07-07-2004

i have to replace the ecm in my 97 ex my tranny isn't shifting right and it was traced back to that

KaZeLL · 07-08-2004

do me a favor and check the oil...and pm me to let me know if it was empty....

supermex · 07-10-2004

I had the same problem and it was the crank sensor broken.
But the computer does the same if any crucial sensor is bad.
Is like tinman said is on a safe mode

brad M · 07-10-2004

finally found out what was causing my CEL coming on and not going over 4000RPM. CEL code was P1259 vtec melfunction. went trough all the trouble shooting step by step and was getting mad that everything was checking out fine but said the computer needed to be updated or replaced. after hours of trying everything i finally pulled off the valve cover to inspect rocker ass. turns out that on the intake side of rocker's by cyl. 4 on top of rocker ass. is a 14mm bolt that blocks off a hole for oil passage for vtec. the bolt back out letting the pressure bleed of and causing CEL to come on. finally i can rev out with no problem and enjoy my tuning that i did.

tinman · 07-11-2004

Interesting cause.... have to write that one down. Thanks for posting that.

KaZeLL · 07-11-2004

nice glad you solved...

Hatorade · 07-11-2004

^^^ yea thats really good to know. i need to save this post just in case

glad to see it was an easy cheap fix.

tugboat · 07-14-2004

i hve 2001 civic ex and got the same code P1259 and my car revs only to 4000rpm and won't let it go over 80mph (it sucks) Brad M was your car a 2001?. I guess i Might have the same problem u had.