hi i have a 96 ford f150 i no its ob2. i thank my smog pump is making noise. if i talk the belt off of it and run a smaller belt would it cause a check engine light?

 

Nope but if you do take it off remove the pulley otherwise you will have the a/c delete belt rubbing against the pulley on the pump.

 

so it wont cause any problems if i take the belt and pulley off?

 

It might cause you some problems down the line.

I'm beginning to suspect that all of the emissions are working in tandem as a team along with the fuel delivery system. Pull one thing out of the line up and it affects everything else.

 

I have all but my pump removed and plan on that as soon as the 89 is fixed. Just call me Sean has deleted his entire emission system and is doing just fine.

 

Not as familiar with the OBDII system. If the smog pump is monitored the same way as OBDI then if you leave the control solenoids the computer won't even know the pump is gone. The cat can clog without the pump though. I still have my EGR as it's integral with engine control.

 

What he said. However the obd2 is more sensitive. It will pick up the difference and may give some false rich codes. I'll check with my emissions instructor next week to verify. But here is a good place to point out , the government is making big changes to the emissions inspection system for obd2. Here in California we will no longer have to test on a dyno. A simple, inexpensive , obd2 plug in will read all emissions. Because of the low expense of the system several states are considering adding inspections for obd2 vehicles. Currently it is against federal law to remove or disable any smog devise weather there is are inspections in your area or not, so there will be no grandfather clause allowing for previously removed devises if they start looking. Anyway my point is smog checks will become stricter so if your truck is streetable and you want to keep it long term its best to repair those things. They only help.

 

This is just speculation on my part:

I think we're generally in agreement that it's a good idea to keep the EGR in place and working well. It makes a positive contribution to improved fuel milage.

The smog pump dumps air into one of three places.

1: Upstream of the 02 sensor into the exhaust manifold.

2: Downstream of the 02 sensor into the cat

3: Directly into the atmosphere.

I've got to wonder if dumping fresh air into the exhaust manifold preps the exhaust for reintroduction via the EGR valve.

If you're sucking "dirty" exhaust into your intake manifold it will cause a buildup of carbon in the intake manifold.

That will create drag and alter the air flow charecteristics of the intake so that you're not getting a good fuel/air mix.

The result has got to be a less than complete burn in the cylinder. That would mean less power,lower fuel milage, and even dirtier emissions.

If it is like this, then it's not like you take your air pump off and a week later everything goes to the dogs.

It's more like a long slow decline of performance till a few years later the overall condition of things has become so degraded that the truck really doesn't run very well anymore.

It's like the domino effect.

Of course ... in the mean time you're apt to get all kinds of engine codes as individual parts of the motor begin to fail.

 

ill have to look at something on my 96 tomorrow to confirm, but you MIGHT get a CEL saying for cat isn't cleaning the air enough or some crap. from my understanding the air pipe that goes into the top of the cat is there to pump fresh air in there to (insert 1 of about 5 different opinions here, but here is the one iv heard the most) help bring your smog levels down by just adding more fresh air.



in the long run, even if it throws a code, it will just be saying your cat is bad.

 

Your talking about 2 different systems. The egr recirculation very small amounts of exhaust into the combustion chamber. It is controlled by the computer to add at certain times. It reduces the temperature at with combustion takes place ( similar to the effect of how pressure increases boiling temperature in the cooling system ). Lower combustion temps allow for more advance timing and lower fuel octane without ping. This reduces carbon deposits.
The smog or secondary air pump is strictly designed for emissions. The cat neutralizes emissions, however it needs oxygen to do it. There is very little oxygen left in exhaust because it has been burned. The pump ads air to allow the gases to burn (at the manifold ) and catalize. ( at the cat ). It switches when the engine runs in a rich condition for an extended period so the extra fuel in the exhaust doesn't burn to hot. If the pump gets stuck in the on position it can burn through the cat or manifold like a cutting torch. However without it exhaust gases can cool too much and clog the cat which can cause engine failure and burned valves. If you have no cats, the pump is of little use, however you will have more unburned waste. Also the o2 sensors are calibrated to the pump and cat ( if you have post cat o2 ). With means you may get false rich codes and cat failure codes. Or the computer will simply compensate and run lean leading to detonation , burned valves, or adjust timing leading to loss of power and fuel economy.