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> Engine running super rich
mepstein
post May 5 2013, 05:54 AM
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Car is a stock '71 w/ d-jet. All fuel lines and vacuum lines replaced. I was having engine issues with it running very poor. I got the engine running but now it it runs super rich. How can I lean it out. The knob on the ecu only does so much.
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TheCabinetmaker
post May 5 2013, 06:52 AM
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How do you know its running rich? You have an afr Meter hooked up? How rich is it? Have you checked vacuum on the mps?
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mepstein
post May 5 2013, 07:29 AM
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QUOTE(The Cabinetmaker @ May 5 2013, 08:52 AM) *

How do you know its running rich? You have an afr Meter hooked up? How rich is it? Have you checked vacuum on the mps?


exhaust smells VERY stongly of gas.

I don't have an afr meter

MPS holds a vacuum.
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JStroud
post May 5 2013, 07:34 AM
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Check fuel pressure?


Jeff
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mepstein
post May 5 2013, 07:38 AM
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QUOTE(jsconst @ May 5 2013, 09:34 AM) *

Check fuel pressure?


Jeff


Original stock fuel pump.
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TheCabinetmaker
post May 5 2013, 07:39 AM
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Leaky or stuck injector.
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mepstein
post May 5 2013, 07:42 AM
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QUOTE(The Cabinetmaker @ May 5 2013, 09:39 AM) *

Leaky or stuck injector.


Could be. Car runs with good power. I just had the injectors cleaned and they flow tested perfect but who knows.
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Bleyseng
post May 5 2013, 07:45 AM
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first test the CHT sensor cuz if that goes bad the mix goes super rich.
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JStroud
post May 5 2013, 07:50 AM
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QUOTE(mepstein @ May 5 2013, 06:38 AM) *

QUOTE(jsconst @ May 5 2013, 09:34 AM) *

Check fuel pressure?


Jeff


Original stock fuel pump.



Doesn't mean anything the pressure regulator controls the pressure, mine was running rich, checked fuel pressure was 31, changed it to 28, runs better.

Jeff
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TheCabinetmaker
post May 5 2013, 07:51 AM
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QUOTE(mepstein @ May 5 2013, 08:42 AM) *

QUOTE(The Cabinetmaker @ May 5 2013, 09:39 AM) *

Leaky or stuck injector.

Could be. Car runs with good power. I just had the injectorcleaned and they flow teted perfect but who knows.

I've seen it happen several times after injectors were
"cleaned"
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mepstein
post May 5 2013, 08:31 AM
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QUOTE(Bleyseng @ May 5 2013, 09:45 AM) *

first test the CHT sensor cuz if that goes bad the mix goes super rich.


It's new within 500 miles.
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mepstein
post May 5 2013, 08:32 AM
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QUOTE(jsconst @ May 5 2013, 09:50 AM) *

QUOTE(mepstein @ May 5 2013, 06:38 AM) *

QUOTE(jsconst @ May 5 2013, 09:34 AM) *

Check fuel pressure?


Jeff


Original stock fuel pump.



Doesn't mean anything the pressure regulator controls the pressure, mine was running rich, checked fuel pressure was 31, changed it to 28, runs better.

Jeff


ok
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913B
post May 5 2013, 09:58 AM
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Leaking cold start injector.
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76-914
post May 5 2013, 10:11 AM
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I look at Curt's first question re: "how do you know that it is running rich"and your reply is that you can smell it. Either your part Cheetah or we're talking about a rich idle condition. Which is it?
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Kaduku
post May 5 2013, 10:41 AM
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I am having the same problem, I think. Starts very easily, smells strongly of gas upon starting that stinks. After about a minute or two of idling, the idling drops dramatically then goes up and down, to where it almost stalls.

Runs like crap for a mile or two then settles to a somewhat normal idle. Then after it really warms up it settles to a high 1200-1400 RPM.

I am having HPH in Redwood City fix her up soon right after I rebuild my pedal assembly.
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mepstein
post May 5 2013, 11:32 AM
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QUOTE(76-914 @ May 5 2013, 12:11 PM) *

I look at Curt's first question re: "how do you know that it is running rich"and your reply is that you can smell it. Either your part Cheetah or we're talking about a rich idle condition. Which is it?


If I stand around the car while its running for a couple minutes, the car, the garage and my clothes all reek of gas.
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mepstein
post May 5 2013, 11:33 AM
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QUOTE(Kaduku @ May 5 2013, 12:41 PM) *

I am having the same problem, I think. Starts very easily, smells strongly of gas upon starting that stinks. After about a minute or two of idling, the idling drops dramatically then goes up and down, to where it almost stalls.

Runs like crap for a mile or two then settles to a somewhat normal idle. Then after it really warms up it settles to a high 1200-1400 RPM.

I am having HPH in Redwood City fix her up soon right after I rebuild my pedal assembly.


Not exactly what I'm getting but similar. The high idle is also there.
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Rand
post May 5 2013, 12:26 PM
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Check the MPS. If the hose isn't connected properly, or the MPS won't hold vacuum, it goes full rich.
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mepstein
post May 5 2013, 02:08 PM
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QUOTE(Rand @ May 5 2013, 02:26 PM) *

Check the MPS. If the hose isn't connected properly, or the MPS won't hold vacuum, it goes full rich.


MPS holds a vacum and hoses are new and tight.
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76-914
post May 5 2013, 02:33 PM
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I think there are at least two things here. You might get better performance to warm up if you install the washer beneath the cut sensor. Brad Mayer? Here sells them. Does the idle hunt even after full warm up when you say the idle is still high. Because both the hunting and high idle are classic signs of a vacuum leak. Block everything on the vacuum system except the MPS and see how it runs.
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