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Posted by: StratPlayer May 19 2019, 02:32 PM

Car is running lean, how to richen it up

Posted by: porschetub May 19 2019, 02:48 PM

Factory FI or carbs?

Posted by: Rand May 19 2019, 02:56 PM

More fuel? I think someone is pulling our leg. I inserted a new foot pedal so his guitar will sound funny until he turns the right knobs.

Posted by: rhodyguy May 19 2019, 03:10 PM

Factory Djet. Not sure on the dist.

Posted by: StratPlayer May 19 2019, 05:56 PM

Factory DJet 123 dizzy 2056

Posted by: Rand May 19 2019, 06:00 PM

Is it lean across the rpm range, or just idle?

Posted by: StratPlayer May 19 2019, 06:46 PM

lean under load, ie: climbing a hill, CHT temp soars to the dangerous range. I have a dakota digital CHT gauge installed thot's I can say the dangerous range. I have the cooling flaps open for summer driving.
I just opened them up last week when I saw those CHT temps soaring under load. Speed 75 5th gear rpm 3100. will pull the plugs tomorrow to inspect them. Running lean

Posted by: 76-914 May 19 2019, 07:03 PM

Jim, if it only happens during a climb out on the Hi-Way I'd suspect the MPS needs a little adjustment on the full load. It's been so damned long since I futzed with D-Jet but IIRC there is an adjustment for the full load "only" side. One of the adjustments effect both ends and I forget but maybe there is also a 3rd function. Drop it off at Eric's.

Posted by: StratPlayer May 19 2019, 07:22 PM

Eric and I discussed this, car will going in next week.

Posted by: JRust May 19 2019, 08:49 PM

Man for some reason when your motor went last time. I thought you went crazy & had Eric throw a 6 in there

Posted by: StratPlayer May 29 2019, 03:24 PM

Update: Well the car went into PMB to find the lean issue. The following photo's are courtesy of PMB. The MPS had to be rebuilt, someone was in there before and solder a bead to try and stop it from leaking of course at that time there were no rebuilt kits for the MPS. The big culprit turned out to be the plenum as you will see in the pics. The plenum was tig welded completely, cracks everything.. Air Sucking Bitch. Thanks to my dakota digital CHT gauge it saved this engine from some serious damage. It's a new build as well.
Cylinder #3 CHT gauge attached to it.


Attached image(s)

Posted by: 76-914 May 29 2019, 04:57 PM

Shit. That plenum was a leaker. I'll bet it pulls better now.

Posted by: johnlush May 29 2019, 07:47 PM

Kudos to you for spotting the issue and getting it addressed before it caused serious issues. Refinished plenum looks awesome!

Posted by: jim_hoyland May 30 2019, 05:49 AM

Way to go Great analysis and quick results.