Godspeedmj

my 94 civic ex stock. wont rev past 3100 rpm in neutral or in any other gear for that matter.. cel is throwing a code 4 and 22 but the car does not have a vtec pressure switch on so thats why its throwing the 22 code. but any advice on what i can do to get my car out of limp mode would be greatly appreciated thanks guys......

Godspeedmj

anyone???

Godspeedmj

bump

HondaHead270

Maybe put the pressure switch back on the thing?

EJeff8

You're missing the pressure switch and crank position sensor. It's put your car in "Limpmode" or "safemode," pick your poison. Until those are replaced and your ecu is cleared, you won't rev past 3100 and your gas mileage and timing will be ****. There yah go.

Godspeedmj

just got the switch yesterday and put it on so its onlyy throwing code 4.

Godspeedmj

cleared the ecu and no code... then start up the car and the cel comes back on throwing same code 4 n still wont rev past 3100 i took apart the dizzy and made sure all components are in tacked ad wires are making contact and still no improvement?

EJeff8

Well, there yah go.

tjdmcoupe

swap out your ecu for another. You can use a DX, LS, Or GSR ecu. Try them and see if it still throws code 4. If not then you know your ecu took a S**T.

Godspeedmj

haha ok ill see if i can find one

EJeff8

Not entirely. If the other ones don't lock him in safemode, then yes but this is a common function on an ECU. Those ECUs will probably be good for 10 minutes then flip when they see the crank sensor isn't relaying info. If the sensor is bad or relaying bad info, the ECU thinks the engine might explode, in which case it's not going to give any more RPMs needed to move the car. Anymore and the ECU will assume it's harmful to the engine. A simple sensor swap and an ECU clear will solve his issue.

Godspeedmj

if its was the ecu when i cleared the ecu wouln't the cel still be on when i checked the codes or only when i start the car?

EJeff8

If you clear the ecu, it should run fine till it finds the problem again in 10 minutes. If you don't fix the problem, clearing won't do **** unless the problem is fixed. The ECU will just do a scan and notice info is missing from this sensor, causing a CEL and putting the ECU in limpmode. Fix the problem, clear the ECU to get the light off and out of limpmode.

Godspeedmj

thanks for all the info guys.... where can i get a new sensor?

EJeff8

A pull a part would be the best bet. Cheap and easy to remove. You could try Autozone but theirs are cheap knock offs.

Rockauto.com may have it for a discounted price. If all else fails, call Honda and buy it. It might be outrageous but it's OEM.

Godspeedmj

ok ill check around and see thank you