P0171 - Sigh, the story of my saga.

[Grimor]

CEL came on on the way home at a stop light. Got home, and idle is a bit rough. around 600rmp and dips randomly. Cleared the code and drove around a bit, no code till I got to a stop light and it popped on again. Gonna start diagnosing it tomorrow. Gonna log the O2 sensors and see if they are in synch or if one looks bad or out of wack.

My check list for problems is;

O2 Sensors
MAF Sensor
Vac Leak
Secondary Air Injection
Intake Manifold Gasket/manifold bolts


Or it might be one of those things that I won't see the CEL for a few more months. Anyone wanna buy a 2006 TB for $7k?

 

[gmcman]

First thing I would do is check the intake manifold bolts. The bolts are 10MM and are easily accessed with a 1/4" drive socket, 3/8 drive is a tighter fit but works also.

Another suspect could be the MAP sensor but I would focus on the intake first.

How old are the O2 sensors?

 

[Grimor]

First thing I would do is check the intake manifold bolts. The bolts are 10MM and are easily accessed with a 1/4" drive socket, 3/8 drive is a tighter fit but works also.

Another suspect could be the MAP sensor but I would focus on the intake first.

How old are the O2 sensors?

I've had the truck for about a month so no clue. From what I've heard (here) our trucks don't like Bosch so stick with AC Delco if I do end up replacing em.

I'll hit the manifold bolts tomorrow and see if I can snug em down a bit more.

 

[gmcman]

Bosch O2 sensors are too hit or miss with these motors, definitely use AC.

These vehicles are very DIY friendly for the most part, don't lose hope this early.

 

[CaptainXL]

I'll hit the manifold bolts tomorrow and see if I can snug em down a bit more.

If the intake manifold is leaking then there is dirt between the gasket, head and or manifold. The proper way to do this would be to replace the gasket, clean all surfaces and torque the bolts to spec in proper sequence.

 

[Grimor]

Bosch O2 sensors are too hit or miss with these motors, definitely use AC.

These vehicles are very DIY friendly for the most part, don't lose hope this early.

My record so far;
Curt Front hitch - Good
K&N HAI - Bad
Homelink & 12V ACC port - Good
Flat on rear - Bad
Red LED Interior - Good
Go Rhino Side Steps (returned because of bad powdercoat) - Bad
Hankook Tires - Good
Discount tire breaking spare tire cable - Bad
Lund Side steps (returned cause don't like em) - Bad
Husky Front and Rear mats - Neutral

It's a lot of bad for only the first month lol

 

[gmcman]

My record so far;
Curt Front hitch - Good
K&N HAI - Bad Not TB's fault
Homelink & 12V ACC port - Good
Flat on rear - Bad Not TB's fault
Red LED Interior - Good
Go Rhino Side Steps (returned because of bad powdercoat) - Bad Not TB's fault
Hankook Tires - Good
Discount tire breaking spare tire cable - Bad Jury is still out
Lund Side steps (returned cause don't like em) - Bad Not TB's fault
Husky Front and Rear mats - Neutral

It's a lot of bad for only the first month lol

I know...lol But hope is not lost.

 

[Denali n DOO]

My record so far;
Curt Front hitch - Good
K&N HAI - Bad
Homelink & 12V ACC port - Good
Flat on rear - Bad
Red LED Interior - Good
Go Rhino Side Steps (returned because of bad powdercoat) - Bad
Hankook Tires - Good
Discount tire breaking spare tire cable - Bad
Lund Side steps (returned cause don't like em) - Bad
Husky Front and Rear mats - Neutral

It's a lot of bad for only the first month lol

I had a 0171 n 0174, cleaned MAF and throttle body and they went away...

 

[gmcman]

I had a 0171 n 0174, cleaned MAF and throttle body and they went away...

K&N HAI - Bad

Good eye there D-DOO...Me no likey K&N especially with a MAF sensor, could be coated in filter oil.

 

[Grimor]

Turns out the filter on my HAI wasn't even on. Kept wanting to pop off so I had to clean the oil off the rubber and slide the clamp higher.

View attachment 27946

Cleaned the MAF and we'll see what happens