car is running rough, Ive replaced the Idle air control valve, and the idle still runs low, and sometimes it jumps up a little, was wondering if this could be a fuel pump, or something like a tps sensor, i don't know what to do if you have an idea id love to hear it

 

possibly your timing...have you recently changed anything before the problem started??distributor or timing belt?? whens the last time you did a tune up(plugs,wires,cap,rotor)?

 

um there is a new timing belt on the car but that was 6 months ago when i put a gasket seal on, so the timing is ok, but i was wondering if a Map sensor, or something of that sort would make the car studder while driving, studders when you go higher in rpm's, bad gas?, i just put the correct oem plug wires/plugs in it, so its not that, its an 89 civic hatchback Si, and the check engine light came on, so i checked the ecu, and it flashed a (3) and then a (5) sooo that's like a map sensor / whole circuit. im just puzzled on this issue totally never had it happen before.

 

it sounds like a map sensor if it studders in high rpms.... and idles rough... it could be that or injectors... have you ran any kind of solvent or anything through your fuel system... try a can of seafoam in a full tank and see if it doesnt help... also check the voltage at the map sensor to see if its ok

 

Pull your spark plugs out, check if they're fouled. Did you gap them properly or just drop them in? better double check your timing aswell. Also clean with alcohol wipes the connection on the map sensor..

 

i pulled out 4 prong plat plugs, replaced with oe plugs and wires, replaced air idle control valve, so either injectors, or an expensive map sensor..., im having a hard time finding a si 1.6 motor in the junk yard, if its a map sensor should i replace the whole circuit?

 

anyone know a place that sells map sensors for a reasonable price?