So i put the complaints i have about my car in this thread [https://www.nairaland.com/nigeria/topic-375453.0.html] and got not the kind of responses i would have wanted,so i decided to create my own thread.Others with similar problems will definately gain more with a major thread isnt it?

How i wish siena has a branch of his office in Nigeria   

I have virtually the same problem with my V8 grand cherokee,it all started after i serviced the car,a poignant,thick,carbon-like smoke and particles that comes most times when i am in a hold up with its attendant shaking/vibration of the car engine was the first step in what has now become a conundrum of some sort.

I was advised by Sultaan then to change the car engine oil to Mobil XHP 20W 50[used AP oil for the first servicing]which i did ang with changing all the plugs.The black smoke continued with an alarming fuel consumption.I was forced to go scan the car which indicated that i should change the injector,the coils[right hand side with 2 from the left side] and the catalyst switch which i did change, all this inclusive of all the plugs again[suffice to state this was all under like 2 months] and the oil[extremely black for a 2 weeks old oil by the time it was drained]

The problem still persists till now[shaking/vibration of the car engine when at a stand still or in a hold up and black smoke] and i am really confused as it just seems my mechanic is really taking a piss right now advising i scan again and change the noozzles   

PS;Sultaan this is why i was asking for your email before the holidays.You can kindly mail me here @ so we can chat as soon as i am online.You seem to know much about this brand hence my insistence.Thanks in advance mate

BTW,I pulled the DTC off my car and viz a viz the diagnostics interpretation i got from this site http://www.scribd.com/doc/9571112/Ford-OBDII-codes#,i wrote the below[this same coils i changed 6 from last week      :

0133 Oxygen sensor slow response[bank 1,sensor 1]
0138 Oxygen sensor circuit high voltage  response[bank 1,sensor 2]
0158  Oxygen sensor circuit high voltage  response[bank 2,sensor 2]
0171  system too lean [bank 1]
0351 ignition coil A primary/secondary circuit
0352 ignition coil B primary/secondary circuit
0353 ignition coil C primary/secondary circuit
0354 ignition coil D primary/secondary circuit
0355 ignition coil E primary/secondary circuit
0357 ignition coil G primary/secondary circuit
0358 ignition coil H primary/secondary circuit

So what's the next step having in mind i just changed the injector and the coils??

still waiting buddies

check your messenger.

I think you misunderstood me

You should be using 5w-30, or 10w-30, most used 20w-50
I meant mistake most made was using the wrong oil weight(20w-50)
Normal oil weight is 5w-30, or 10w-30
I use a V8 jeep and I have done this on a thread read

https://www.nairaland.com/nigeria/topic-258780.0.html
https://www.nairaland.com/nigeria/topic-334902.0.html
They might look alike when in the can, but the flow different when car reaches operating temperature.
20w50 will get heavier when hot and not lubricate the engine properly. So 10w-30 is the ideal oil for NigeriaBut you have to chek your owner's manual to be sure
Read this page

http://www.carbibles.com/engineoil_bible.html

When I went to Naija this Xmas, I found out that Most gas stations had 20w-50 API CC on display and people were using it in their cars
It should be 10w-30 API SM API CC is for diesel engines

Just checked it and didnt get anything

The email is (mind the underscore after the y)

Or you can just simply email me your own email so we can pick things from there.

Thanks in advance mate

Was this you
https://www.nairaland.com/nigeria/topic-334902.0.html

Yeah Sultaan,same car,worsened case.

been buzzing you

ofemi234@ yahooo.cm
remove the 34

https://www.nairaland.com/nigeria/topic-334902.0.html

Thanks for the call and your intervention has been immense.I already reset the OBD and can't pull any error code afterwards i.e no error code is coming up,just showing DONE!.

Also read some stuffs about TPS and IAC from here http://www.justanswer.com/questions/1js1t-what-does-the-tps-and-iac-do-my-car-is-having-difficulty ,quite helpful

A quick question though,where is the oxygen sensor for this car(2001 Grand Cherokee) located and how is it related to the catalytic switch?

What is it's function(s),is it more than 1 and how is it possible it's malfunctioning can culminate in emission of black smoke?

Thanks once again and you my xmas gift albeit late.

Good day Sultaan,

Took the car for a ride today and these are the codes it came up with ;

P0141 and P0161.Googled it and everything seems to be tending towards the 02 sensor as indicated by these forums:

http://www.fixya.com/cars/t3385017-will_hollowed_catalytic_converter_cause
http://www.fixya.com/cars/t3040619-2001_cherokee_4_0_6cyl_p0161_p0158_codes
http://www.obd-codes.com/forums/viewtopic.php?f=2&t=4960

Can you kindly respond to these questions and also let me know if the sensors are dude for change or can it be fixed?:

where is the oxygen sensor for this car(2001 Grand Cherokee) located and how is it related to the catalytic switch?

What is it's function(s),is it more than 1 and how is it possible it's malfunctioning can culminate in emission of black smoke?

Thanks

I took the car for a drive today and this is the code i pulled up.Everything seems to be pointing towards the oxygen sensors:

P0141 (Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2))
P0161 (Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 2))
P0138 Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)
P0171 System too Lean (Bank 1)
P0158 Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 2)

Courtesy:http://www.4x4community.co.za/forum/showthread.php?t=36045

Kindly respond to the questions i asked in my earlier post:

where is the oxygen sensor for this car(2001 Grand Cherokee) located and how is it related to the catalytic switch?

What is it's function(s),is it more than 1 and how is it possible it's malfunctioning can culminate in emission of black smoke?

Do i change the sensors along with the catalyst switch now with this new error code coming up?

I will appreciate if i can get a pictoral rep of this sensors too.

Thanks a lot!

Read this page
http://www.wjjeeps.com/oxygen.htm

Seems both sensors after catalytic converter is faulty, the measure exhaust gas to make sure your engine is not burning too much gas, too much hydrocarbon and it will add more O2 to system. You can have them pulled to see if its cloged with soot, or just change them.Part numbers are on the page.part # should be Bosch 13937 for the sensors. The ones before catalytic conveters are upstream, after converter is downstream.
http://en.wikipedia.org/wiki/Catalytic_converter

http://www.obd-codes.com/p0141

Before you start changing sensors, look at this thread(check the fuse I had to change a sensor once cos of a 50cents fuse)

http://www.jeepsunlimited.com/forums/showthread.php?t=465162&highlight=p0141

Fuse box is in engine bay
You mentioned a catalytic switch what I know is converter. You will see O2 sensors screwed to exhaust pipes with wires coming out of them(in small cars you probably see upstream sensor around heat shield i front of engine.

Read this page
http://www.wjjeeps.com/oxygen.htm

Seems both sensors after catalytic converter is faulty, the measure exhaust gas to make sure your engine is not burning too much gas, too much hydrocarbon and it will add more O2 to system. You can have them pulled to see if its cloged with soot, or just change them.Part numbers are on the page.part # should be Bosch 13937 for the sensors. The ones before catalytic conveters are upstream, after converter is downstream.
http://en.wikipedia.org/wiki/Catalytic_converter

http://www.obd-codes.com/p0141

Before you start changing sensors, look at this thread(check the fuse I had to change a sensor once cos of a 50cents fuse)

http://www.jeepsunlimited.com/forums/showthread.php?t=465162&highlight=p0141

Fuse box is in engine bay
You mentioned a catalytic switch what I know is converter. You will see O2 sensors screwed to exhaust pipes with wires coming out of them(in small cars you probably see upstream sensor around heat shield i front of engine.

I postedwith images and info, but it keeps disappearing.

Read this page
http://www.wjjeeps.com/oxygen.htm

Seems both sensors after catalytic converter is faulty, the measure exhaust gas to make sure your engine is not burning too much gas, too much hydrocarbon and it will add more O2 to system. You can have them pulled to see if its cloged with soot, or just change them.Part numbers are on the page.part # should be Bosch 13937 for the sensors. The ones before catalytic conveters are upstream, after converter is downstream.
http://en.wikipedia.org/wiki/Catalytic_converter

http://www.obd-codes.com/p0141

Before you start changing sensors, look at this thread(check the fuse I had to change a sensor once cos of a 50cents fuse)

http://www.jeepsunlimited.com/forums/showthread.php?t=465162&highlight=p0141

Fuse box is in engine bay
You mentioned a catalytic switch what I know is converter. You will see O2 sensors screwed to exhaust pipes with wires coming out of them(in small cars you probably see upstream sensor around heat shield i front of engine.

If you have drained the old AP oil and replaced both oil and oil filter with the recommended, then I suggest you get a rewire to reset your vehicle's brainbox.