I have a NG engined 1992 B3 Coupe I'm trying to recomission after years of being layed up.
Here's a little bit of back ground to set the scene. I had the gearbox out to replace the selector shaft seal. Part of the exhaust of the exhaust system needs to be removed to lower the gearbox down. Ideally only the catalytic converter needs to be removed. I had to remove the downpipe and catalyst together as I didn't want to disturb the flange joint with the donut as the the rotating flange on the downpipe is quite thin and getting it to seal gain would be far from easy.
So with that out of the way and the gearbox down I split the box and replaced the seal. I got the gearbox back up after a lot a wresting with it. Refitting the downpipe with cat wasn't possible because the flange at the other end of the catalyst is paper thin and couldn't be used.
Since a genuine catalyst is NLA nor are aftermarket catalysts apart from generic stuff which won't fit out of the box without considerable fabrication.
The only satisfatory solution I could come up with was to fit an OEM silencer which has the same fitment as the original catalyst it use doesn't have the lambda sensor boss or the same internals. I also fitted a new OE downpipe with gasket and sealing ring.
When I now run the car it is running rich as you would expect as it is running open loop without a catalyst afterall. The odd thing, to me at least, is that tailpipes now expell a fair amount of water (or steam when cold) on start up. While the rich fueling smell seems is certainly present at the rear of the car, the worst of the smell seems to be coming from the engine bay which is evident from above and below.
So would the above behaviour be considered normal for the changes made or is there another leak in the system? Because this is a reverse flow head I han't see much of the exhaust manifold to visually check for leaks.
The car idles okay, and no ticking sounds can be heard from the exhaust manifold.
Is it worth using a smoke leak detector on the rear tailpipe or is this just something I'll have to accept as a consquence of these parts being replaced?
The thing is, when I first owned this car it had a silencer instead of a catalyst and I don't remember it running rich back then although this was a long time ago so I can't be absolutely certain.
If anyone has any direct or related experience of this please share here.
Edit: the title should actually read "KE3-Jetronic exhaust system running rich" but I can't edit it.
Thanks in advance,
Rob.
Here's a little bit of back ground to set the scene. I had the gearbox out to replace the selector shaft seal. Part of the exhaust of the exhaust system needs to be removed to lower the gearbox down. Ideally only the catalytic converter needs to be removed. I had to remove the downpipe and catalyst together as I didn't want to disturb the flange joint with the donut as the the rotating flange on the downpipe is quite thin and getting it to seal gain would be far from easy.
So with that out of the way and the gearbox down I split the box and replaced the seal. I got the gearbox back up after a lot a wresting with it. Refitting the downpipe with cat wasn't possible because the flange at the other end of the catalyst is paper thin and couldn't be used.
Since a genuine catalyst is NLA nor are aftermarket catalysts apart from generic stuff which won't fit out of the box without considerable fabrication.
The only satisfatory solution I could come up with was to fit an OEM silencer which has the same fitment as the original catalyst it use doesn't have the lambda sensor boss or the same internals. I also fitted a new OE downpipe with gasket and sealing ring.
When I now run the car it is running rich as you would expect as it is running open loop without a catalyst afterall. The odd thing, to me at least, is that tailpipes now expell a fair amount of water (or steam when cold) on start up. While the rich fueling smell seems is certainly present at the rear of the car, the worst of the smell seems to be coming from the engine bay which is evident from above and below.
So would the above behaviour be considered normal for the changes made or is there another leak in the system? Because this is a reverse flow head I han't see much of the exhaust manifold to visually check for leaks.
The car idles okay, and no ticking sounds can be heard from the exhaust manifold.
Is it worth using a smoke leak detector on the rear tailpipe or is this just something I'll have to accept as a consquence of these parts being replaced?
The thing is, when I first owned this car it had a silencer instead of a catalyst and I don't remember it running rich back then although this was a long time ago so I can't be absolutely certain.
If anyone has any direct or related experience of this please share here.
Edit: the title should actually read "KE3-Jetronic exhaust system running rich" but I can't edit it.
Thanks in advance,
Rob.
Comment