Hope you guys can help. I have a 1989 GT with a bad air pump (binding) and want to remove it. Don't really need a air pump and reallly don't want to buy a air pump idler, but I have heard of people putting on a short belt to bypass the air pump while still retaining power steering and AC. Nobody at local part stores seems to have a clue about what size belt to use so I came to the Mustang experts. Any help is greatly apreciated.
5.0 Nostalgia
10 Year Member
5.0 Nostalgia said:If you are running everything else, use the 84.5" belt.
Thanks a million.
5.0 Nostalgia
10 Year Member
quiksilver9531
Founding Member
I used an 84.5 in belt to by pass it...I was thinking about removing it but what do u with those tubes that go behind the motor
jerry beach
Founding Member
Just block them off at the back of the head and remove them. I cut the ends off the metal pipe and bolted them to the heads backwards as many have done. The one that goes to the exhaust can be cut off near the H-pipe and capped with a rubber heat hose cap. Put a coin in it that fits properly to help with heat resistance and the edge of the pipe cutting into it. Pinch it shut and weld it is a better option.
TheUser
Active Member
if you fellas are removing the pipes, I need the one that goes to the h pipe for my stocker. To keep my post tech, if you go to a place that sells the belts in metric units, I believe mine to bypass smog on my GT was 2020 mm or something like that...if you have O'Reilys there, the part number is "Micro V K060775"
fujifrench2k4
New Member
quick question. Ive been wondering how do you get to the pipes going to the back of the heads off?
Michael Yount
Mustang Master
On each head there is a small bolt that connects the crossover pipe fitting to each head. Simply (have fun) remove that bolt on the back of each head and the crossover will come off. Then you'll need to plug the holes that the crossover was pumping air into or you'll have exhaust leaks back there. You can either get the proper size short bolt from the hardware store, get the threaded inserts from your Ford dealer, or simply cut the ends off the crossover tube with a hacksaw, flip them over so the flat side covers the hole, and screw them right back on.
Soupy
New Member
This is a nice diagram, does anyone have one for the SN95's?
jb89coupe said:An 84.5" belt worked for me with the stock pulleys. With underdrives I use a 83.5". The routing is a little different than just bypassing the air pump pulley.
Michael Yount
Mustang Master
I'd add that getting the correct size can be require a bit of trial and error. Depending on the pulleys on the car, and the shape/location/range of the tensioner, deleting the smog pump while maintaining the p/s and a/c, can require anything from an 83" to an 85" belt. Mine has stock pulleys and required an 84" belt to keep the tensioner in the center of its 'range'. I recommend picking up 3 belts spread across the belt sizes mentioned above, and simply taking back the two that you don't use.
BlueThunder1988
New Member
- May 19, 2003
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Any downside to deleting/bypassing the EGR stuff? We don't have emissions testing or inspections for it and I've got an off-road X already. It'd sure be nice to clean up that rat's nest of tubing on the passenger side.
Michael Yount
Mustang Master
BlueThunder- Yes, potentially, there is downside. Working properly, the egr is all upside. It descreases emissions, increases fuel mileage, and is non-functional at w.o.t. so there's no performance downside. It works by allowing small amounts of exhaust gas (egr - exhaust gas recirculation) to be injected into the intake air under part throttle, low load conditions. The exhaust is inert, and displaces air/oxygen that would otherwise be present. That bit of inert gas in the mixture actually reduces (cools) combustion temperatures allowing the computer to add more timing advance, and lean the fuel mixture out without risking detonation. If you remove the egr gas from the equation, the computer doesn't know that, and it continues to add timing and pull fuel under low load. Sometimes this results in detonation that wasn't present before. Since detonation is also impacted by ambient temps, it's cold enough now in most of the country, that you might not have a problem until next spring/summer when temps rise. Unfortunately there's no way to predict what's gonna happen with your car. Variables include mods (compression ratio), engine condition and mileage, geographic location (temps, elevation, etc.). Many others will likely post and tell you they had a problem or didn't have a problem. Unfortunately, that's not really helpful to you. The only way to know what's gonna happen to yours is to remove it and see. But since it won't help wot performance, and it will likely hurt emissions and fuel mileage, why remove it?
Having said all that - I removed all of mine because I didn't like the clutter, and I used a chip to turn off the egr function in the computer - that's the proper way to solve any potential detonation issues.
Good luck with it.
Having said all that - I removed all of mine because I didn't like the clutter, and I used a chip to turn off the egr function in the computer - that's the proper way to solve any potential detonation issues.
Good luck with it.
Michael Yount
Mustang Master
Oh - and you know that the egr system and the air injection/pump systems are two completely different things, right?
Of course, disabling the egr usually results in a check engine light and error codes too.
Of course, disabling the egr usually results in a check engine light and error codes too.
fujifrench2k4
New Member
Michael Yount
Mustang Master
If any of you removing the pump still have cats - be aware that removing the pump while keeping the cats in place can cause the cats to clog sooner than they otherwise might.