P0171, P0174 CEL after seafoam?

I know! Another P0171, P0174 CEL thread.

Mine is a little different situation. I have a 2006 4.0 and I used 3 quarters of a can of seafoam through the brake booster. I got the white smoke, engine ran smoother, everything was fine. Two days later the CEL came on and the truck ran sluggish and hesitant on acceleration. I have a code reader/ clearer (not a word but you get it) It gave me codes P0171 and P0174 left and right bank system to lean. So I thought the seafoam maybe had something to do with that and cleared the codes. Truck was back to running like its peppy self.

Two days later and BAM. Coming home from Vegas CEL came on again and the truck started running sluggish again. Pulled over to get fuel, I had my code reader, same codes again, left and right bank system to lean. I cleared the codes thinking it would run normal again but not the case. Light is still off two days later but the truck is still running sluggish and hesitates when accelerating.

One more thing, after the first time I bought some MAF cleaner and cleand the sensor and it ran fine for two days. But the light came on and now is running sluggish.

Ok long post! My question is, Could the seafoam cause this problem? Burn up sensors or sparkplugs?

thanks for any help..

 

I have same issues

 

TIS gives these as possible faulty sensors or areas of inspection needed:

Air induction system
Injector blockage
Mass Air Flow (MAF) meter
Engine Coolant Temperature (ECT) sensor
Fuel pressure
Gas leakage from exhaust system
Open or short in A/F sensor (bank 1, 2 sensor 1) circuit
A/F sensor (bank 1, 2 sensor 1)
A/F sensor heater (bank 1, 2 sensor 1)
A/F sensor heater relay
A/F sensor heater and A/F sensor heater relay circuits
PCV valve and hose
PCV hose connections
ECM

My question is; why did you sea foam in the first place?

 

Just turned over 100k and figured why not.

Oh and I have a stock intake. Everything was great until two days after seafoam?

Is it coincidence the light came on? Or is seafoam the culprit? Hmmmmmmm

 

Bump, curious for any input?

 

Did you check for any vacuum leaks? As your vehicle ages the rubber hoses under the hood get brittle from exposure to heat/petroleum products/oxidation. It's really tough to say. You need to do some diagnosis work to try and narrow it down. I can't imagine an injector issue as the miles are little on the low side. But again, I am purely speculating here. You would need to scrape your knuckles a bit and get a little grease under those nails. Your codes are fairly generic and that leads to a lot of "guesswork" when trying to diagnose over the interwebz...

 

I know my fun is just beginning... I am wondering if the seafoam had something to do with it so I could start there first.

 

I would never dump Seafoam into a vacuum line of any kind. I know lots have done it and claim to have wonderful results. The danger is dumping it in too fast and too much and washing the cylinder of lubrication. There is also the danger of wiping out the O2 Sensors and problems with the Catylitic Converter(s). I use the theory of just adding some ( 1/2 cup ) Seafoam to the gasoline tank every few fill ups and I've never had any issues.

On a brighter note ( Most likely ) it could be a loose connection on a vacuum line ( such as the one you disconnected ) that is bypassing the MAF Sensor.

 

Ok, this is what I was wondering. So I can start with the o2 sensors and go from there if the seafoam burned up a sensor.

 

Is there something specific about the Tacoma that makes it a bad idea to Seafoam? I've read more than a handful of posts/threads where people say not to do it. I've used Seafoam in my previous 2 cars (1 was SC'd, the other turbo'd) and never had any issues other than the temporary CEL from overloading the O2 sensors. The CEL always went away on its own and I never had any real (or permanent) damage from the Seafoam.

 

Nothing special about the Tacoma. I'm saying that there have been many many cases of people dumping too much Seafoam into a vacuum line ( Brake Vacuum Booster ), washing out the cylinder wall lubrication. This results in scored cylinder walls, loss of compression and oil burning. It could also result in the death of one or more O2 Sensors. Not to mention hydrolocking the engine, which has also been done.

https://www.google.com/#q=The+danger+of+seafoam

The Normal use of Seafoam ( added to the gasoline and or oil ) is quite adequate for any cleaning needed.

Be honest, if your valves and cylinders are getting carboned up so much you need to dump Seafoam into the vacuum booster hose you have bigger issues.

 

Ordered bank 1 and bank 2 AFR sensors today. They come in next week. So the fun begins...

 

Makes sense. I've always done vacuum line and gas tank on my cars. Vacuum line cleared out a bunch of stuff on my Accord. Then I threw a supercharger on it and had to up to 93 octane, so the fuel additives made it unnecessary. I guess with 7500k on the Tacoma, I should start doing a little Seafoam in the gas tank to keep it clean before it gets mucked up.

 

I wouldn't replace the af sensors just yet I would let that tank of gas run thru and fill up with gas clear the codes and see what happens

 

I've done this! The light is off for now but the codes are pending and it is still running sluggish.

 

If the O2 sensors are clogged and not reading properly, your air fuel ratio will be off and could cause the sluggish-ness.

I remember there being a way to "clean" an O2 sensor. You might want to give Google a shot and see if it's an easy thing to try. Worse case scenario, either way, you'll be getting new O2 sensors.

 

This might be a good idea.

 

Replaced the AFR sensors on both banks and still running sluggish. I cannot find a vacuum leak anywhere. Cleaned the MAF sensor again! No change.

Whats the next step?

Anybody?

Could the seafoam damage something inside the intake runner?

 

Unplug the battery and make it relearn your driving habits?

 

Did this also. Checked the sparkplugs, they looked clean.