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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emerygt350 |
Sep 6 2022, 01:01 PM
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#2
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Advanced Member Group: Members Posts: 2,147 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Yeah, check that cold start valve.
Any chance you can borrow another ECU? (another quick and easy check if it is available). I have to suspect soemthing catastrophic with something like the csv. Even max rich by the ECU wouldn't cause what you are experiencing. I seriously doubt your brand new injectors are stuck open. as stated above... it's the only other thing bringing fuel. You could block the csv fuel line (super easy) and give it a go. Not even sure the trigger points or malfunctioning 123dizzy could cause this either. |
Halfnelson |
Sep 6 2022, 01:07 PM
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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 |
Yeah, check that cold start valve. Any chance you can borrow another ECU? (another quick and easy check if it is available). I have to suspect soemthing catastrophic with something like the csv. Even max rich by the ECU wouldn't cause what you are experiencing. I seriously doubt your brand new injectors are stuck open. as stated above... it's the only other thing bringing fuel. You could block the csv fuel line (super easy) and give it a go. Not even sure the trigger points or malfunctioning 123dizzy could cause this either. The CSV should have been done - but I'll double check as that makes sense. Also, will try and borrow an ECU. |
Lockwodo |
Sep 7 2022, 04:38 PM
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#4
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Member Group: Members Posts: 201 Joined: 23-December 21 From: Santa Cruz, Californnia Member No.: 26,193 Region Association: Northern California |
Yeah, check that cold start valve. Any chance you can borrow another ECU? (another quick and easy check if it is available). I have to suspect soemthing catastrophic with something like the csv. Even max rich by the ECU wouldn't cause what you are experiencing. I seriously doubt your brand new injectors are stuck open. as stated above... it's the only other thing bringing fuel. You could block the csv fuel line (super easy) and give it a go. Not even sure the trigger points or malfunctioning 123dizzy could cause this either. The CSV should have been done - but I'll double check as that makes sense. Also, will try and borrow an ECU. You mentioned checking the CSV "bypass" but I'm not seeing in this string if that was done. If the pressurized fuel line is still connected to the cold start valve and that valve is leaking, that could be the source of the fuel leak into the engine as others have pointed out. You could confirm by pulling the valve out of the manifold and pressurizing the fuel line. |
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