Air pump "on or off?"
Thread Starter
Cruising
Joined: Oct 2010
Posts: 14
Likes: 0
From: Chesterfield VA
Air pump "on or off?"
I have a stock '94 and I'm looking to replace my stock exhaust and want to go with headers, high flow cats and low restriction mufflers. My question relates to the headers. My 94 has a factory air pump, with lines running into the stock manifolds. If I put headers on the car without the air pump connects, (yeah, I wanna trash the air pump), will that cause the ECM to throw out an engine code? Since I'm trashing a factory installed part, will it cause my engine to run worse? Anyone who has done this and is willing to give me some advice...I'm all ears.
Team Owner
Joined: Jul 2004
Posts: 28,469
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From: Hartford WI
I have a stock '94 and I'm looking to replace my stock exhaust and want to go with headers, high flow cats and low restriction mufflers. My question relates to the headers. My 94 has a factory air pump, with lines running into the stock manifolds. If I put headers on the car without the air pump connects, (yeah, I wanna trash the air pump), will that cause the ECM to throw out an engine code? Since I'm trashing a factory installed part, will it cause my engine to run worse? Anyone who has done this and is willing to give me some advice...I'm all ears.
Thread Starter
Cruising
Joined: Oct 2010
Posts: 14
Likes: 0
From: Chesterfield VA
[QUOTE=aklim;1575726169]since you are already going that route, you probably would need to get a custom chip. Tell the programmer that and he will blank it out even if it is there. Kinda like 91s have an EGR and the chip can ignore any data to and from sensors relating to it.
Thanks a ton!
Al
Thanks a ton!
Al
Team Owner
Joined: Dec 1999
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The AIR pump is electric and only operates long enough to allow the ECM to go into closed loop. Simply removing the large tube at the pump itself should not set a code. Don't cap it off, just let the air escape into the headlamp well. The later electric AIR pumps don't cause a loss of HP.
Long-tube headers will be expensive and not as easy to find as they are for earlier C4's. The factory cats on the LT-1 C4's actually flow very well. Do a search on "headers" and you will find lots of good info on them.
Stay with no more than a 2 3/4" diameter exhaust, use an X-pipe with low restriction mufflers. Some mufflers will generate tons of drone inside the car, especially at cruise speed and RPM's in the 1300 thru 1600 range.
The 94 doesn't use a chip in the sense that the earlier cars had a removable chip. The later C4's will need a programmer that is connected to the ALDL to make changes to the ECM soldered-in flash chip.
Long-tube headers will be expensive and not as easy to find as they are for earlier C4's. The factory cats on the LT-1 C4's actually flow very well. Do a search on "headers" and you will find lots of good info on them.
Stay with no more than a 2 3/4" diameter exhaust, use an X-pipe with low restriction mufflers. Some mufflers will generate tons of drone inside the car, especially at cruise speed and RPM's in the 1300 thru 1600 range.
The 94 doesn't use a chip in the sense that the earlier cars had a removable chip. The later C4's will need a programmer that is connected to the ALDL to make changes to the ECM soldered-in flash chip.
