Smoke test results for lean condition - big problem?
#1
Smoke test results for lean condition - big problem?
I was consistently getting P0171 lean condition codes on my 2003 XKR.
Finally, had a local shop do a smoke test. The test indicated a large vacuum
leak under the supercharger and/or plenum area. Lots of smoke.
What villains reside in this area that could be spawning this leak?
Is it likely that the supercharger will have to be removed to address this
issue?
If the supercharger will have to be removed, what other parts, hoses
gaskets should be replaced at the same time?
I've been on the forum for some time, and I realize that this is huge
request, but, any guidance or thoughts would be greatly appreciated.
Finally, had a local shop do a smoke test. The test indicated a large vacuum
leak under the supercharger and/or plenum area. Lots of smoke.
What villains reside in this area that could be spawning this leak?
Is it likely that the supercharger will have to be removed to address this
issue?
If the supercharger will have to be removed, what other parts, hoses
gaskets should be replaced at the same time?
I've been on the forum for some time, and I realize that this is huge
request, but, any guidance or thoughts would be greatly appreciated.
#2
I don't *think* there is anything *under* the supercharger that could leak.
But, the duct seals between the "V8" top part of the supercharger and the
twin ducts leading to the throttle body can get deformed and sucked in.
If it was the bottom part of the seal, it might appear to come from underneath.
Waiting for corrections from others
But, the duct seals between the "V8" top part of the supercharger and the
twin ducts leading to the throttle body can get deformed and sucked in.
If it was the bottom part of the seal, it might appear to come from underneath.
Waiting for corrections from others
#3
The supercharger duct seal problem did extend into 2003...check your VIN number against the TSB: http://jagrepair.com/images/TSB/TSB2...erformance.pdf
#4
#5
As other said, nothing is actually under the supercharger. Did it appear to come from one side or the other in particular?
There is a small injector manifold between the intercooler and heads. Those have something that look like a small head gasket on either side, plus the injector o-ring, all of which could leak.
Intake elbow at the rear of the supercharger is another possibility. The EGR is at the far rear near the firewall, plus numerous sensors and vacuum connections for brakes, breather, on the left and right sides.
Something down in that area seems more likely to me than the injector manifold gaskets. And if they did the test with the intake tube on, it would be difficult to see most of those vacuum ports on the elbow.
There is a small injector manifold between the intercooler and heads. Those have something that look like a small head gasket on either side, plus the injector o-ring, all of which could leak.
Intake elbow at the rear of the supercharger is another possibility. The EGR is at the far rear near the firewall, plus numerous sensors and vacuum connections for brakes, breather, on the left and right sides.
Something down in that area seems more likely to me than the injector manifold gaskets. And if they did the test with the intake tube on, it would be difficult to see most of those vacuum ports on the elbow.
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