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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jrmdir |
Jul 23 2021, 08:19 AM
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#2
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Member Group: Members Posts: 224 Joined: 13-May 21 From: Central Ohio Member No.: 25,544 Region Association: Upper MidWest |
Welcome to the D-Jet rich mixture madness. I'm going through the same issue with my '73 1.7. Only to my limited knowledge about this car, I don't think it had a lean history that was compensated for. So far I've found a number of reasons for running rich, including disintegrated MPS diaphragm, high fuel pressure and (possibly) leaking cold start injector. Next I'm going to check the cylinder head temp sensor.
There are a number of great threads on this. Here's one that has tons of info: https://members.rennlist.com/pbanders/DJetParts.htm (easier to search Google than here - and you most ofthen still get to 914World threads as a result.) If your car was running lean over time and you're looking for ways that the PO might have tried to enrichen it, check out the wiring from the cylinder head temp sensor to the ECU. On our 1.7's there should be no in-line resistor, which, as I understand it was added by the factory for either the 1.8s or 2.0s - to "fool" the ECU into delivering more fuel without reprogramming the 1.7 ECU. There is some mention of 1.7 owners adding this themselves thinking it would add power (not!) Good luck - report back if/when you get this resolved, it may be something I've yet to find in my quest. Ron |
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