Multiple Codes seem to be connected need help

[BlueCollarTahoe]

2004 chevy tahoe LT 5.3 v8

got a code reader after engine light came on solid. Pulled codes P0442, PO300, PO171, P0131. Thought maybe it was the spark plugs, mechanice pulled and replaced with AC Delco iridiums. Said the plugs were still good, the wires were shot. changed them. Light on still and have the PO300 and PO171 and PO131. Suggested i change the Coils once i get them which i will do, but im worried about the Lean Bank code. watched some videos, read some articles, could be a myriad of things. anyone have any suggestions how i should go about fixing this stuff? i can change filters, possibly the sensors after cleaning them etc on my own. any advice? ideas? thanks.

 

[01ssreda4]

Clean MAF and replace both o2 sensors and I bet your issues go away.

 

[BlueCollarTahoe]

gonna clean the MAF tomorrow. think replacing 02 sensors is easy enough for a newbie? Im a handyman otherwise just not on cars lol

 

[BlueCollarTahoe]

also do you need just 2? seen some reviews people talking as if they used more. was gonna go with this one:

ACDelco 213-1702 GM Original Equipment Heated Oxygen Sensor

i think this is the right one

 

[06Escalade]

I'm thinking vacuum. The intake manifold gasket is cheap and easy to replace. I would replace the throttle body gasket as well while its apart. also, are you consuming any oil?

 

[BlueCollarTahoe]

oil seems fine. put it in the week after i got it, slowly winding down. couple months at 55 percent now. this is what i did today:

I cleaned the throttle, was dirty.

I cleaned the MAF, was filthy.

Changed the air filter. used a FRAM equivalent couldnt find an AC Delco anywhere.

reset the codes, started the car up, no return yet. feels stronger. still had a rough idle. Should I change the 02 sensors anyway? which ones are the correct ones for 2004 chevy tahoe 5.3 v8?

 

[BlueCollarTahoe]

ugh, light came back on. p0300. had the spark plugs and wires changed on friday before i did the above. the rest of the codes did not come back though. any thoughts? looking at the ignition coils next

 

[01ssreda4]

Drive it around and see if it will give you a specific cylinder number for a misfire.

 

[BlueCollarTahoe]

Drive it around and see if it will give you a specific cylinder number for a misfire.

thats basically what i came here to post. I drove it maybe 25 miles today. i pulled with my reader got 0300, and the 171. I went to an autozone to see if they pull with a better reader if ittl tell me which cylinder. they got the same codes, random misfires, but their computer said i should replace the fuel pressure regulator. Havent seen this in any diagnostic lists. where is it on a 2004 chevy tahoe? seen videos of suburbans same years and its not in the same place. anyone whos gone through this what should i replace next? i can only do one at a time. the coils, the sensors or now this fuel pressure regulator? any thoughts?

 

[01ssreda4]

I wouldnt replace the regulator unless it tests bad.

 

[BlueCollarTahoe]

also smelling gasoline inside the car here and there

 

[BlueCollarTahoe]

read it could be the fuel pump going. also read the regulator is built into the fuel pump in 04. not sure which way to go next.

 

[BlueCollarTahoe]

basically im at this point not sure what to replace next:

02 sensors
Coils
fuel pump


car has a super rough idle, car shakes, seems to be using more gas than usual. little slow on the acceleration. smell gas time to time if that makes a difference. i saw it mentioned.


already did:
spark plugs changed
spark plug wires changed
air filter changed
MAF cleaned
Throttle Cleaned

PO300 and lean bank 1 code is haunting me right now.

 

[dantheman]

lean bank 1? spray some brake or carb cleaner around where the intake manifold meets the heads and see if the idle speeds up. having a big vacuum leak can cause both the misfires and the lean condition. If it revs up when you spray near the intake to head mounting surface you probably need to do intake manifold gaskets.

 

[BlueCollarTahoe]

took it to a diagnostic place had them do the works. cylinder 7 and 8 were the culprits. One due to an improperly installed sparkplug and the other to a faulty fuel injector. Had both fixed, shes back to normal guys. Guess the last place i took it to for the sparkplug and wire change wont be getting my business anymore. I guess the wires and the fuel injectors were the reasons behind this whole ordeal. thanks for the replies.

 

[01ssreda4]

Glad you got it sorted out.

 

[BlueCollarTahoe]

the dreaded light is back. I took it back to the place, they ran more tests. they think it maybe the sensor or the fuel injectors. new codes came up now:

p0171
P0300
p0131
P1133


considering the sensor codes coming up now, im thinking it maybe causing the misfires and the lean banks. anyone know where i can find out exactly the replacement is for the 02 sensor? should i replaced the front 2?

2004 chevy tahoe 5.3L V8

 

[BlueCollarTahoe]

googled it, came up with a parts number for a brand called denso. searched the parts number and an AC delco one came up.


Denso 234-4668 Oxygen Sensor

vs

ACDelco 213-1702 GM Original Equipment Heated Oxygen Sensor.

anyone know if this is the right one? which should i go with? the amazon garage and the reviews say the Denso is the OE one. ACdelco slightly more expensive. doesnt matter i want the better one. should i replace both in bank1 with those codes?

 

[BlueCollarTahoe]

read the reviews, cross searched, gonna get the Denso ones. gonna replace both in Bank 1. hopefully this does it. will update.

 

[BlueCollarTahoe]

ugh!!! okay i replaced one sensor that came out easily but was a monster pain in the ass to reconnect. i will upload a picture later but the 02 sensor was covered in black. looked online and it looks similar to being an oil fouled sensor. i went to replace the 2nd on and while it was placed much easier the sensor is frozen and stripped in there. ived tried it all, lubes, wrenches, hammers and locking pliers. wont budge i need to replace it. ive seen videos of ppl heating up the bolts to loosen them. would anyone reccomend this? other than the code for this messed up sensor the truck is riding smooth. its coming down to heating it up and taking it out or taking it to a place to have them remove it. i struggled with it for 2 hours yesterday.