cobra malfunction please help

danielson631

danielson631

Well-Known Member
#1
#1
over the weekend i removed the alt, coil packs, and air intake to do some painting. while disassembling things my dog got a hold of chewed the **** out of the air charge sensor so i bought a new one.

the engine is new only about 1500 miles. the car has 125k.

after i re assembled everything and took it for a spin i immediatley noticed it was lacking power. when i step on the gas the car kind of sputters and bucks, sometimes worse then others, but if i drive it lightly and casually it seems to drive normal. that is until i bring up the rpms to above 2k or anywhere above

also, when i decelerate it kind of bogs down at first. but also only really happens around 2000rpms or above

the ignition system is all new.

i cleaned the MAF while i had everything dissassembled

there arent any codes being thrown out except the usual stuck IMRCs code

not sure what else i can put to help explain. mods are in my sig.

anyone have any advice on why this is happening or what to look for?

and does the air charge sensor have to be facing a certain way? could that be it?

also tomorrow im going to change the fuel filter.

someone please help, i dont want to take it to a mechanic just yet.
 
danielson631

danielson631

Well-Known Member
#3
#3
d-nice said:
I think that the MAF sensor should be facing towards the incoming air.
Click to expand...
the MAFsensor is facing the correct way. the air charge sensor i wasnt sure about but no matter which way its facing the problem persists.

still not throwing any codes. ill try and change the fuel filter tomorrow and see if that helps if not im going to bring it to my mechanic and have him take a look.
 
danielson631

danielson631

Well-Known Member
#5
#5
04 orange cobra said:
Check the coil-on packs... possible not snapped on to plug right...
Click to expand...
you mean the coil packs? they are are plugged in tight and secure all the plug wires are in the correct order as well.

tomorrow im going to clean the MAFsensor bc im not sure when exactly i cleaned it. might have gotten dirty before i put it back on. i dont know what else it could be so im hoping its either that or maybe need a new fuel filter.
 
danielson631

danielson631

Well-Known Member
#7
#7
04 orange cobra said:
My bad.... if everything was fine before you took things apart.... sounds like its electricial....
Click to expand...

electrical as in??

the igntion is all brand new coilpacks plugs and wires. and yeah everything was working fine before i took it apart. idk what i managed to screw up this time hopefully its nothing major.:smash:

i was thinking of cleaning the maf and changing the fuel filter tonight instead of tomorrow. if niether help i hope its not electrical and if it still runs like crap ill take it to my mechanic in the morning.

anymore advice would be appreciated before i bring it to the shop please and thanks
 
danielson631

danielson631

Well-Known Member
#8
#8
changed the fuel filter, that didnt help.


i brought it to my mechanic, these are the notes that were on the receipt.

"check accel bogs
check engine light on
PO1516 IMRC input error
P1518 IMRC stuck open
P1000 cat/sec air/ o2/o2 heater/
EGR monitors not ready
Found IMRC cables cut?
o2 sensors not responding correctly?
long term fuel trims not responding?"


WHAT.THE.FCK .
 
danielson631

danielson631

Well-Known Member
#10
#10
d-nice said:
I was thinking that when you took everything apart you may have did something to the IMRC plates. Check this out--> http://www.ehow.com/how_5487913_zip-imrcs-open-mustang-cobra.html

Seeing the codes you listed I though that this may give you another thing to look at.


Just a question: Did you disconnect the battery when you took all of the stuff off?
Click to expand...


yes i disconnected the battery before i dissassmbled

im starting to believe its the o2 sensors or the egr valve or both.
tomorrow i will replace these things and see if that helps

btw the IMRCs are ziptied already
 
danielson631

danielson631

Well-Known Member
#11
#11
alright well the cobra is running tip top again.

the fuel filter was disgustingly clogged. put a new one. the old rear o2's looked chard, installed two news ones. and also changed the EGR valve.

also, one of the clamps on the coupler/throttlebody for the intake was loose, and wouldnt tighten so i put a new one on, i think that was mostly part of the problem, but everything else i changed was all original and needed to be changed anyhow.

such a relief
 
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