Hello folks. Had quite a few error codes in the beginning... CATS o2 sensors etc.
B3000 3.0 2004

JUST REPLACED:

-PLUGS
-WIRES
-COILPACK
-Y PIPE AND ALL 3 CATS
-ALL 4 O2 SENORS

Issue:

ERROR CODE PO172, followed by mainly cylinder one misfire code. Other cylenders also randomly misfireing as well. Misfire in first 1000 revolutions code.

Issues only present when truck is at an idle. At any other time other than idle truck is running very well. Misfires are barely noticeable.

When truck is at operating temparature and turned off, its starts back up perfectly. But, if left sitting for 10-15 minutes it has to crank for a bit before it fires. BUT if allowed to cool, will fire up perfectly normal.

Stuck injector??

MAF sensor just cleaned an appears to be ok with live data readings of 4.20 at an idle and then gos up as RPM increases.

Newer engine, about 200 k on it<< newer lol

Smell of incomplete combustion at an idle.

All boots seem ok.

present codes:

bank 1 too rich
cyl 1 misfire
cyl 2 misfire
cyl 5 misfire
rdm misfire
misfire first 1000 revoloutions

ONLY AT AN IDLE i can clear the codes and drive as long as |I want. But as soon as I stop..... engine light

Any help would be appreciated. No cash for a dealer repair

 

You might be looking at some bad heads. Do a compression test.

See: Ford 3.0L Misfire TSB # 05-26-3

 

was afraid you were gonna say that. will do. will report findings.

 

You seem to have some sort of scantool, so if it'll perform a power balance test, first do that to see if it'll flag a particular cyl that conforms with your trouble codes, then do the compression test on that/those cyls.

 

Thanks. This thing will do some cool stuff... live data etc. Ill have to read the manual.

only paid 100 bucks for it tho. no huge hopes. lol

Getting a compression tester soon at crappy tire.... ugh another 40 bucks.

 

If it can disable fuel injectors, its likely to be programmed to be able to perform a cyl balance test. So, look in the instructions for "Power Balance". or "Cylinder Balance" test.

EDIT: Let us know what you find.

 

BTW, Welcome to FTE!!!!

 

Kirk
A few threads down I have a similar issue, with the exception that my code is P0174. I had thrown part after part at it to try and figure it out to no avail (egr valve, TPS, IAC, hoses, etc.)! Finally just yesterday I took it to the stealership and they determined that it was MAF related. So hopefully you too will find a more economical situation.

 

Hey guys, thanks for your replys. Pawpaw: my reader doesnt have that ability. Sorry didnt answer right away, been busy with work.

I thought too it could be MAF related. But my reader live data says its measuring air. whats the airflow specs for this engine supposed to be? Anone know by chance??

mines reading 4-6 gpm at an idle and goes up as rmp increases. I hope its a |MAS issue. Not putting new heads on this truck. Man, just had this engine installed t=not too lang ago... 50,000 k ago.

 

pawpaw: did notice that if I disconnect the electrical to fuel injector CYC 1, the idle does NOT change. Any other cylender and the idle changes

 

OK, so that suggests that injector 1 isn't working for some reason, so have a listen with your stethoscope, or rig one with a length of hose, or tubing, long screwdriver or broom handle & listen for a tic while its idling. If no sound, check for 12 volts B+ at KOEO at its electrical connector.
Injector resistance should be between 12 & 16 ohms & all injectors resistance reading should be closely matched.

 

Most likely injector#1 is leaking or stuck wide open.

 

hey boys. did a compression test today.

looks like cyl 1,2,3 are good @ 120 lbs
4,5,6 however are not. 60 - 90 pounds.

this is now beyond my understanding and there are just too many possibilities- time to get the ol girl into a shop and get er fixed

you guys rock man and thanks for your help.

Kirk

 

Kinda sounds like a drivers side head gasket problem, let us know whats found.