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Re: Codes and a miss and some more fun stuff
Posted by Dean [Email] (more from Dean) on Tue, 27 Dec 2005 19:16:23
In Reply to: Re: Codes and a miss and some more fun stuff, xvwguy, Tue, 27 Dec 2005 16:19:27
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Unless you tell me that the bucking is happening with high boost...
1171 is from the system needing to adjust too much in an attempt to get the O2 sensors to see the right reading. Missing can also make the system see/do the same thing.
The old O2 sensors may have been sooty, but might have been working ok. They may have been reporting what was happening and might not have been a cause.
Pull the plugs and read their deposits now. So you know if the mixture is still rich. Take note of any difference between the plugs.
Large VAC leaks would tend to lean things out and make the AF rich. A leak in the turbo system between the turbo and the TB would make things rich when on boost.
A sticking TB can be a problem, but it can't make things rich.
I would check the small VAC line from the TB to the FPR. Remove from FPR and attempt to start, assistant needed, and see if that end if the hose gets vacuum. The hose could be damaged or the orifice in the TB blocked. If the FPR does not get the manifold pressure/vacuum, you run very rich on low throttle settings and lean on boost. So this is one major source of big mixture errors.
The MAF could do this as well by reporting more air than actual, that would be rich, and the adaption might be overwhelmed. But I would expect a MAF specific CEL. But perhaps the system is too stupid to mange that. We see T7 MAFs screw up and do not get a code for that.
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