ohenrycao

Recently my b20b went into limp mode, but unfortunately there's no CEL so I can't read any codes. Car won't go pass 3500 rpm, changed injectors took it to pep boys and did a fuel cleansing and still the same. I reset my ecu couple times and still, can someone give me some hints on where to start looking could it just be my ecu that's fried?

HondaPartsHero

You must list your year make model. Ecu? Check engine light works?

ohenrycao

Bump, did some research on why this would happen dizzy okay spark plugs are fine, wires, sensors everything seems to be fine, can't seem to figure out why it's in limp mode though

ohenrycao

It's a 99, b20b in my 94 rs integra. Yes my CEL works ecu is a obd1 94 j spec ecu. This just recently happened it was revving pass 4k fine last month

ohenrycao

Tttttt any help would do just need ideas on where to start looking

HondaPartsHero

could be literally anything but generally limp doesn't come without a CEL.

Cam timing
Sensors
Distributor bad sensors
Etc

ohenrycao

Everything starts up normal, engine turns and idles fine, but when I'm revving it doesn't want to let me get over 3500 rpms
Thinking about getting a new ecu off eBay to see if that'll fix anything

Dylan Rhodes

Bump Im having the same exact problem!!

motoxxxman

limp mode with no codes usually means code 0, which means bad ecu. No codes is different than code 0 though.
To test for code zero, just check the codes the normal way by jumping the service connector with ignition on. If the CEL lights up solid, there are no codes. If the cel stays off, that means code 0.