The coolant hose which goes from the back of the throttle body to the
back of the engine block burst last night. The hole is at the bottom
of the hose so I need to replace the hose. Is there *any* way to
replace this hose without removing the throttle body? I've tried and I
think it's almost impossible.

Any advice greatly appreciated...

Andy
89RX7 GTUs
arvai@scripps.edu

 

Unless u have extremely small hands with joints that bend in impossible ways, youll have to remove other parts to get to that hose. what i did with it is: If u feel comfortable (before u take all this other stuff apart, relieve the fuel system pressure by running the engine and pulling the fuel pump electrical connector...once u disconnect it, the engine will shut down....then take the gas cap off........remove afm and the big hose that runs to the throttle body, pull off the top end of the coolant hose that burst, disconnect the 3 vac lines on the front of the dynamic chamber, disconnect the 2 vac lines on the back of the dynamic chamber, disconnect the hose that runs from the bac to the waterpump, unplug the bac sensor, unplug the TPS connector from the harness, unbolt the nuts and long bolt that secure the UIM to the LIM, you'll also need to unbolt the secondary fuel rail.....also disconnect the injectors themselves from the rail (not the electrical connectors) but just pull the injectors from the rail.....be careful while doing this. be sure not to loose any pieces from the injectors! youll also want to unhook the oil metering rod from the front of the tb....just pull out the cotter pin carefully and unhook the rod.......once everything is disconnected, pull up on the tb assembly/dynamic chamber/UIM to separate it from the lim....be careful while doing this....u should be able to get lots of room to work with that split hose....u can rest the entire assembly out of the way in the engine compartment.....After postng a just realized the u have s5.....pretty much everything should apply still......if u go to pull the UIM up and it seems to get stuck, figure out whats keeping it from coming out...there may be additional connectors or vac lines on your s5

 

I was able to replace this hose without removing anything. However, it was
a *lot* of work - about 12 hours over 3 days. I cut away the hose around the bottom hose
clamp with a razor blade and was able to rotate the clamp so I could remove
it with needle nose pliers. After finally getting the hose removed I installed a new
hose and put a screw type hose clamp on the bottom.

 

^^^^^12 hours **** that . Replace it as per haynes or redfc3s86. Not a big job at all.....just work carefully and focused is all.

John ny

 

get familair with your car, pull the TB!!
Do it right or face doing it again later down the road because it wasnt done correctly and double checked.

 

+1. I can have my TB and UIM off in under 15 minutes now. It's really not that bad when you look at it. It's just a few nuts and bolts and some plugs. The hardest part is keeping track of all the vacuum lines.

 

I think its best to remove the UIM/TB. That way everything is clear and u can see exactly what you're doing. It is a pain in the butt to have to remove all that other stuff just to get to a little hose that takes a few seconds to replace. i put the stock hose clamp back on mine plus a screw type one. I think Mazda shouldve had a "s" curve hard line coming off the back of the engine that ran further up the firewall (instead of just a nipple).

 

You're right - taking off the throttle body would have been the better
way to do it. However while working on it I always felt I was really
close and thought if I just spent a little more time it would be
finished. Then it got to the point that I spent so much time on it that
I just didn't want to give up. Perhaps a bit obsessive, but I did
learn a lot about my car. So far no leaks...

 

I did that hose... ended up removing the intake due to poor hose clamp placement... It didn't take that long though.... just annoying.