I was reading that someone (I dont remember who) said that their temp origionally ran in the 180-190 degree range. They said that they took off their air pump and it now runs in the 220-240 degree range. I have not programmed any chips yet(plan on doing so in the future after learning a little more and getting the money) but I was wondering if their is some kind of variables in the chip that could fix this problem or if it was totaly unrelated and could have just been a coincidence. The reason I wondered is because I live in Decatur, Illinois. They dont check us for emmissions. I was wondering if taking the air pump off would cause problems with running hot or if it could be prevented. Sorry about the long message but I just really wanted to know about this before I screw something up. Thanks for your help.

 

Disabling any emissions equipment is still a federal crime. From what I know the guys around here just do chips for off roads purposes.

During warm up the airpump discharges air pre O2 sensor. Once warm the disharge place is post O2 sensor. So the ecm never really know what the air pump statuse is.

The change in operating temp., dooesn't make any sense, if things were operating properly. If the diverter valve was stuck, and the air was going in pre O2, and then removing it just corrected things, and there was another problem.

 

Thanks for your help. I was not just planing on taking it off. I am taking the whole system out of a wrecked car and I plan on puting the injection system on a roller 350 I have. I didnt know if it would even work on the 350. I will be having a lot of help from my friend. This will be my first engine build up. I have been reading and asking questions so I can plan exactly what I want. What exactly does this diverter valve control and where is it. I was wondering exactly what the air pump does. It takes air from the exhaust and recycles it throught the engine doesnt it? I dont understand if what I just said is so how it discharges air pre and post o2 sensor. The 02 sensor is in the exhaust why would it pump air from the exhaust back in the exhaust after the oxygen sensor? Thanks for your help

 

The AIR pump pumps air into the exhaust to help burn off Hydrocarbons in order to help the cat do its job. The EGR system is what "recycles" some of the exhaust gas to lower the temperature in the combustion chambers.

However, I think this thread should be moved to the general discussion forum....

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ZaphodB a.k.a Carl Andersson - zaphodb@faxancruisers.org
'89 Camaro IROC-Z 5.7L TPI - Mods under construction :-)
Custom ARAP Chip Under Development/180 t-stat, Edelbrock TES Headers,
SLP Airfoil, K&N Filters, Accel 8mm wires, Relocated MAT, AFPR @ 45 PSI