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High NOx and Volvo/Chrysler Ignition — a suggestion... 200 1986

uid 18083's pic
posted by  lucid on  Sun Oct 9 02:51 CST 2005
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

You have the Volvo/Chrysler ignition used on 240s from mid '81 thru 1988. It's been found that the V/C Ignition can contribute to high NOx, and that plugging the vacuum line to the ICU can reduce the NOx level with little effect on normal operation. Note that this is not a guaranteed fix, but worth a try if your other numbers (and cat) are good.

I first posted this (with source and technical description) on 5/21/04 (see original post. ) One person (CA) soon found that it solved his high NOX problem, and posted his happy response here, in the original thread.
NOTE that he had failed with a new cat, then plugged the ICU vacuum line, put the old cat back on and passed!.

Another success was posted in this thread. And yet another one here.

One person did recently report that this tip reduced his NOx, but CO and HC went up in this post. However, he also had some exhaust work done between tests, which may have been a factor. (A change in ignition timing advance should not increase CO and HC levels.)
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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