Help - Djet running way too rich |
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Help - Djet running way too rich |
Halfnelson |
Jul 23 2021, 06:51 AM
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#1
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Newbie Group: Members Posts: 46 Joined: 31-July 17 From: Cornwall Member No.: 21,303 Region Association: England |
Help - my new to me 1973 1.7 Djet came running really sweet, but almost immediately developed the 'hunting tick-over' of lean running / air leak. We replaced all the vacuum pipes, found one of the inlet gaskets had a very slight leak. Seems somewhere along the line things have been tweaked to compensate for the leaks so that now they're cured, the car is running super rich. Having had a L-jet for years the Djet is new to me so any advice on where to start first would be much appreciated. Thanks Chris
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Dave_Darling |
Jul 24 2021, 01:05 AM
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#2
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914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Step 1: Check the ignition system. Yes, seriously. Make sure the timing and dwell are in spec, and that you're getting a nice fat white happy spark.
It's amazing how many "FI problems" (and "carb problems"!) are actually caused by ignition system issues. Step 2: Check the valve adjustments. Valves that are out of whack can cause odd-seeming problems. For instance, an intake valve that doesn't close all the way can cause a very rich mixture. (Don't ask how I know that.) Then move on to testing the parts of the FI system. --DD |
Halfnelson |
Jul 24 2021, 07:44 AM
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#3
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Newbie Group: Members Posts: 46 Joined: 31-July 17 From: Cornwall Member No.: 21,303 Region Association: England |
Many thanks for all the suggestions - plenty to work our way through on Monday and I'll report back. Had a read through other similar threads - one that said CHT sensors don't often go bad - is it more likely a case of bad connections?
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