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92 RS with 3.1L to 3.4L conversion and AC (w/3.4L larger injectors but the original 3.1L memcal or prom chip). Shortly I will be pulling my engine and while it is out, I am thinking about removing the smog pump. The pump injects into the cat converter so the O2 sensor is upstream of the injection point. Is it correct that I shouldn't see any error codes or loss of gas mileage by deleting the smog pump and plugging the tube on the cat?
My 89 2.8 has the smog pump deleted, and doesn't have any codes. I can't say whether it affected mileage, it was done before I bought it. I still get 20 mpg or so with mixed driving, though.
Thanks. I was mostly concerned that it wouldn't lower the gas mileage or throw a code (particularly code 32) due to reduced back pressure in the exhaust since it won't be pumping air into the cat. Guess I will leave it out when I put the engine back in. Just have to find the right shorter belt.
I remove em on all my older vehicles. No codes just less restriction. They do stop up sometimes Ive had it happen. They do make newer ones that are high flow but Im not putting one back on.
Anybody have a correct AC Delco or Gates belt part number for Smog Delete but with A/C? With the correct belt, does anyone have the correct belt routing so that the pumps etc rotate in the correct direction? I have the big (2 inch thick) original 92 Camaro Service Manual but it does not show a belt routing without Smog but with A/C.
IMHO it is worth it to remove just to eliminate the noise especially if the pump is worn which is common. The air pump was an early attempt to cheaply control cold start emissions to get the cats heated up faster. It does much less under normal driving conditions yet still pumps away. Unless your car is driven daily with common cold start cycles, I think your conscious should be clear as far as damaging the earth if its removed. Your local authorities my not agree which means you probably may want to retain it.
Anybody have a correct AC Delco or Gates belt part number for Smog Delete but with A/C? With the correct belt, does anyone have the correct belt routing so that the pumps etc rotate in the correct direction? I have the big (2 inch thick) original 92 Camaro Service Manual but it does not show a belt routing without Smog but with A/C.
Absolutely no guarantee on the belt length: K060915
Can do a rudimentary measurement with a piece of rope.
Routing:
The issue with this is the long stretch of belt between the alternator and crank pulley. With the A/C engaged it tends to whip, which causes noise and vibration. The '88 & '89 cars used an idler pulley setup to put tension on that stretch of belt. Recommended to be added. Different length belt(s) too.
10-19-2023, 01:23 AM
