What sensors could be fouled by a bad seafoam? Which sensors would cause the car to miss after a bad seafoam?

 

If ya put it in the intake,your plugs are fouled.

 

already replaced those...thinkin possibly the map sensor

 

The Oxygen Sensors WILL get carboned up from Sea Foaming. Its better to jsut get in the habit of using a good injector cleaner frequently.

Regardless though, to awnser your question, its almost positively your oxygen sensors that are messed up. They meter your Air/Fuel ratio. If they become carboned, they dont send back an accurate voltage to the PCM ( 100 to 900 mV, nearly constantly fluctuating in that range, especially if the RPM of the motor is changing ( You revving it/driving ))

To test and see if its the Oxy's, take the car out, and nail it a few times. Once the PCM kicks into Enriching Mode ( Which is at 80% throttle I believe ) it over rides the O2 sensor readings and runs off of set parameters for the most part. Take the car out, floor it a few times, and if the miss is not apparent at full throttle, Change the O2's ...

Also, as you started to say about perhaps the map sensor is bad and so on, I highly doubt it, but I guess anything is possible. The only reasonable explanation for that fouling would be from the EGR letting "dirty" carboned up gasses flow and get distributed through the intake ... I would highly doubt that this would allow enough **** in though to **** up the MAP sensors.

I would absolutley check the O2's first.

 

Im gettin ready to change mine, anyone have any good tips for getting them out, they seem to be in very hard to accesss areas. I do have the o2 socket but any other tips?

 

Spray them with PB Blaster a few days ahead of time a few times as well.

Get a torch too if you can that way you can get the O2 bungs ( Hehe I said bung ... ) good and hot. Try getting them out while its still hot from the torches. If it doesnt want to break loose yet, try letting it cool completely. Sometimes from the heat, once it cools it will come right out.

 

Exactly how did you put the SeaFoam into the engine? Details might help us figure out what you might have screwed up. I've seen some serious mistakes made picking the wrong vacuum line.

 

i put it through the brake booster line, however, i did it on a cold engine.

 

Then there's a good chance you fully saturated the O2 sensors with excess fuel and SeaFoam. The engine runs very rich on cold start. With all that extra fuel pouring into the cylinders, plus the SeaFoam, it wouldn't be surprising to find both the plugs and the O2 sensors, and probably the cats, fully saturated with liquids, that then turned to carbon as the exhaust heated up.

 

the only problem with the o2 theory is my problem starts when i start the car not after the o2s heat up.

 

When the car starts, its using the "learned" long term fuel corrections (BLM's). If the BLM's are screwed up from bad O2 readings in closed loop, they will affect the open loop operation. Open loop uses cell 18 for the BLM's, and that cell is made up by using a weighted average of the "closed loop" cells. In open loop, you just don't get the added problems from the short term fuel corrections (INT's), since they are locked at 128.

 

So are you saying that seafoam should never be used? Even if put in the brake booster?

 

Its not that it shouldnt be used. Just that you should Remove your O2's first, and dont do it until your ready for a full tune up ( Right before you replace your plugs )

However, I dont use it on my Camaro. I have used it on a high mileage motor that needed cleaned out once but it still is much simpler to run a quality injector cleaner such as Lucas through it frequently.

 

Are you asking me? I didn't say the word "never".

With any product, you need to use it correctly. Pouring excess fuel into an engine (cold start), and then adding additional liquids can cause damage.... washing down the cylinder walls and exposing the rings and cylinder walls to excessive wear. Obviously, the downstream components.... sensors and cats, for example... may be damaged. Put enough liquid in a cold engine and you can hydrolock it.

That's all I was trying to point out.... please don't put words in my mouth.

 

its the number one problem for a hesitation, bog, stumble. I replaced it without any change. The reason ive been telling people they are wrong is because the answers i normally get are opti, plug, wires, and o2s. Up until your last post i was under the assumption that the o2s were disregarded during startup, but now that i found out their previous calculations are used in closed loop that very well could be the reason for my problem.

sorry bout the multiple posts, and hopefully the o2s are what the problem is. thank you for your help.