hey i have a 2001 jeep cherokee and it has a bunch of misfire code like p0300 p0301 p0302 p0305…

herkiss517

hey i have a 2001 jeep cherokee and it has a bunch of misfire code like p0300 p0301 p0302 p0305 p0306 p0304 what can this mean and how much is it gonna cost to fix this

Comments (6)
No. 1-6
guyonearth
guyonearth

So you believed the guy that sold it to you? I've got a bridge in Brooklyn for sale. Pull out all the plugs and inspect them. It probably needs plugs and wires. There is no such thing as a "cracked injector", it would be spraying gas all over the place. Start with the basics and go from there.

BranMan
BranMan

Oh and also while you're at it, do a fuel pump PSI check as well for your fuel rail, and then test each fuel injector to make sure each one has proper volts as well as it spitting fuel.

BranMan
BranMan

I agree with @cjacob2014 , usually misfire codes are because of failing coil pack OR starting to fail 02 sensors, usually downstream affects with the mixture/burning of air and fuel, so improper mixture can lead to a misfire, how ever your ECU would throw a code for 02 sensor so if there is none, 02 shouldn't be the issue. My recommendations are to check coil pack first, then check spark plugs to make sure no oil is burning, then do a compression test on each cylinder to make sure you're at 128-135 PSI per cylinder. If all is well, just replace coil pack.I highly doubt your head gasket is blown because then your motor would be rough running and idling hard shaking as if it was shivering cold and white smoke would be coming from the sides of it as well as exhaust.

ScottyKilmer
ScottyKilmer

lots of misfires, knowing jeeps, have the engine compression checked wet and dry, often the engines blow head gaskets or have other internal failures

herkiss517
herkiss517

well i know the plugs was change i just got the jeep and he said it was and easy fix but when i did the research it was alot but i will cheak it and replace it but do u know how much would it cost in the shop and the guy that sold me the car said it had a crack in one of the injector so idk but y all those codes

cjacob2014
cjacob2014

have you checjed the plugs and coil pack? easy place to start.