Join Date: Jun 2003
Location: Valdosta, Georgia
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Weber Carb Dieseling
I am reposting this question after a weekend of no cure.
Briefly, 84 CJ7 w/258, minimal emmissions (no EGR, ECU, etc), TFI upgrade and Weber carb. Good vacuum, good gas, good fuel filter, good spark, good choke, correct idle speed, etc. Can't seem to get it timed where it will perform at top end and NOT diesel on shut-off. I removed the fuel pressure regulator because it was fuel starving the carb in 3 and 4 gear.
I have no vacuum leaks. Have timed it per engine specs (9 @ 1600) and many points in between. I have timed it advancing the ignition to to pull the most vacuum at 1600 rpm. All idles @ 650. No mater what it diesels on shut off.
I know the regulator should be in line. This may be part of the problem. The other clue I believe has something to do with the air fuel mixture. I can turn it in and cause the engine to stumble but can turn it all the way out with no change. The correct mix should be in between the two stumbles, right?
The CJ was running fine with a slight top end ping prior to the addition of the regulator and the adjustment to the timing. Any ideas?